diff --git a/.changeset/wicked-socks-peel.md b/.changeset/wicked-socks-peel.md
new file mode 100644
index 0000000000..7518d356db
--- /dev/null
+++ b/.changeset/wicked-socks-peel.md
@@ -0,0 +1,9 @@
+---
+'@api3/airnode-adapter': minor
+'@api3/airnode-deployer': minor
+'@api3/airnode-examples': minor
+'@api3/airnode-node': minor
+'@api3/airnode-validator': minor
+---
+
+Added API call skip feature.
diff --git a/packages/airnode-adapter/package.json b/packages/airnode-adapter/package.json
index f149f6490b..442b527bcf 100644
--- a/packages/airnode-adapter/package.json
+++ b/packages/airnode-adapter/package.json
@@ -19,7 +19,7 @@
     "test:watch": "yarn test:ts --watch"
   },
   "dependencies": {
-    "@api3/ois": "1.2.0",
+    "@api3/ois": "1.3.0",
     "@api3/promise-utils": "^0.3.0",
     "axios": "1.1.3",
     "bignumber.js": "^9.1.0",
diff --git a/packages/airnode-adapter/src/request-building/build-request.ts b/packages/airnode-adapter/src/request-building/build-request.ts
index 8a11895672..b6b83900f2 100644
--- a/packages/airnode-adapter/src/request-building/build-request.ts
+++ b/packages/airnode-adapter/src/request-building/build-request.ts
@@ -10,7 +10,7 @@ function cacheRequestOptions(options: BuildRequestOptions): CachedBuildRequestOp
     throw new Error(`Endpoint: '${options.endpointName}' not found in the OIS.`);
   }
 
-  const { method, path } = endpoint.operation;
+  const { method, path } = endpoint.operation!;
   const operation = ois.apiSpecifications.paths[path][method]!;
   return { ...options, endpoint, operation };
 }
@@ -25,12 +25,12 @@ export function buildRequest(options: BuildRequestOptions): Request {
   // Different base URLs are not supported at the operation level
   const baseUrl = ois.apiSpecifications.servers[0].url;
   const parameters = buildParameters(cachedOptions);
-  const path = parsePathWithParameters(endpoint.operation.path, parameters.paths);
+  const path = parsePathWithParameters(endpoint.operation!.path, parameters.paths);
 
   return {
     baseUrl,
     path,
-    method: endpoint.operation.method,
+    method: endpoint.operation!.method,
     headers: parameters.headers,
     data: parameters.query,
   };
diff --git a/packages/airnode-adapter/test/fixtures/ois.ts b/packages/airnode-adapter/test/fixtures/ois.ts
index deea87d6c7..71db60098a 100644
--- a/packages/airnode-adapter/test/fixtures/ois.ts
+++ b/packages/airnode-adapter/test/fixtures/ois.ts
@@ -2,7 +2,7 @@ import { OIS } from '@api3/ois';
 
 export function buildOIS(overrides?: Partial<OIS>): OIS {
   return {
-    oisFormat: '1.2.0',
+    oisFormat: '1.3.0',
     version: '1.2.3',
     title: 'Currency Converter API',
     apiSpecifications: {
diff --git a/packages/airnode-adapter/test/fixtures/options.ts b/packages/airnode-adapter/test/fixtures/options.ts
index 8266cab1ec..c3e69c8cba 100644
--- a/packages/airnode-adapter/test/fixtures/options.ts
+++ b/packages/airnode-adapter/test/fixtures/options.ts
@@ -25,7 +25,7 @@ export function buildRequestOptions(overrides?: Partial<BuildRequestOptions>): B
 export function buildCacheRequestOptions(overrides?: Partial<CachedBuildRequestOptions>): CachedBuildRequestOptions {
   const options = buildRequestOptions();
   const endpoint = options.ois.endpoints[0];
-  const { method, path } = endpoint.operation;
+  const { method, path } = endpoint.operation!;
   const operation = options.ois.apiSpecifications.paths[path][method]!;
   return {
     ...options,
diff --git a/packages/airnode-deployer/config/config.example.json b/packages/airnode-deployer/config/config.example.json
index 916098a403..b018311b02 100644
--- a/packages/airnode-deployer/config/config.example.json
+++ b/packages/airnode-deployer/config/config.example.json
@@ -87,7 +87,7 @@
   "templates": [],
   "ois": [
     {
-      "oisFormat": "1.2.0",
+      "oisFormat": "1.3.0",
       "title": "CoinGecko basic request",
       "version": "1.0.0",
       "apiSpecifications": {
diff --git a/packages/airnode-deployer/test/fixtures/config.aws.valid.json b/packages/airnode-deployer/test/fixtures/config.aws.valid.json
index 2ef480ac71..90ba186557 100644
--- a/packages/airnode-deployer/test/fixtures/config.aws.valid.json
+++ b/packages/airnode-deployer/test/fixtures/config.aws.valid.json
@@ -90,7 +90,7 @@
   "templates": [],
   "ois": [
     {
-      "oisFormat": "1.2.0",
+      "oisFormat": "1.3.0",
       "title": "CoinGecko basic request",
       "version": "1.0.0",
       "apiSpecifications": {
diff --git a/packages/airnode-deployer/test/fixtures/config.gcp.valid.json b/packages/airnode-deployer/test/fixtures/config.gcp.valid.json
index 0a5104c47a..f497a1606f 100644
--- a/packages/airnode-deployer/test/fixtures/config.gcp.valid.json
+++ b/packages/airnode-deployer/test/fixtures/config.gcp.valid.json
@@ -90,7 +90,7 @@
   "templates": [],
   "ois": [
     {
-      "oisFormat": "1.2.0",
+      "oisFormat": "1.3.0",
       "title": "CoinGecko basic request",
       "version": "1.0.0",
       "apiSpecifications": {
diff --git a/packages/airnode-examples/integrations/authenticated-coinmarketcap/config.example.json b/packages/airnode-examples/integrations/authenticated-coinmarketcap/config.example.json
index acee6ff180..ac3a324f56 100644
--- a/packages/airnode-examples/integrations/authenticated-coinmarketcap/config.example.json
+++ b/packages/airnode-examples/integrations/authenticated-coinmarketcap/config.example.json
@@ -78,7 +78,7 @@
   "templates": [],
   "ois": [
     {
-      "oisFormat": "1.2.0",
+      "oisFormat": "1.3.0",
       "title": "CoinMarketCap Basic Authenticated Request",
       "version": "1.0.0",
       "apiSpecifications": {
diff --git a/packages/airnode-examples/integrations/authenticated-coinmarketcap/create-config.ts b/packages/airnode-examples/integrations/authenticated-coinmarketcap/create-config.ts
index b34252e220..1b81ecac13 100644
--- a/packages/airnode-examples/integrations/authenticated-coinmarketcap/create-config.ts
+++ b/packages/airnode-examples/integrations/authenticated-coinmarketcap/create-config.ts
@@ -85,7 +85,7 @@ const createConfig = async (generateExampleFile: boolean): Promise<Config> => ({
   templates: [],
   ois: [
     {
-      oisFormat: '1.2.0',
+      oisFormat: '1.3.0',
       title: 'CoinMarketCap Basic Authenticated Request',
       version: '1.0.0',
       apiSpecifications: {
diff --git a/packages/airnode-examples/integrations/coingecko-cross-chain-authorizer/config.example.json b/packages/airnode-examples/integrations/coingecko-cross-chain-authorizer/config.example.json
index 2d62297904..f00abb0c97 100644
--- a/packages/airnode-examples/integrations/coingecko-cross-chain-authorizer/config.example.json
+++ b/packages/airnode-examples/integrations/coingecko-cross-chain-authorizer/config.example.json
@@ -90,7 +90,7 @@
   "templates": [],
   "ois": [
     {
-      "oisFormat": "1.2.0",
+      "oisFormat": "1.3.0",
       "title": "CoinGecko basic request",
       "version": "1.0.0",
       "apiSpecifications": {
diff --git a/packages/airnode-examples/integrations/coingecko-cross-chain-authorizer/create-config.ts b/packages/airnode-examples/integrations/coingecko-cross-chain-authorizer/create-config.ts
index 1cfeeedba2..e952ed64f5 100644
--- a/packages/airnode-examples/integrations/coingecko-cross-chain-authorizer/create-config.ts
+++ b/packages/airnode-examples/integrations/coingecko-cross-chain-authorizer/create-config.ts
@@ -98,7 +98,7 @@ const createConfig = async (generateExampleFile: boolean): Promise<Config> => ({
   templates: [],
   ois: [
     {
-      oisFormat: '1.2.0',
+      oisFormat: '1.3.0',
       title: 'CoinGecko basic request',
       version: '1.0.0',
       apiSpecifications: {
diff --git a/packages/airnode-examples/integrations/coingecko-post-processing/config.example.json b/packages/airnode-examples/integrations/coingecko-post-processing/config.example.json
index 599b6525b1..a9e3de245c 100644
--- a/packages/airnode-examples/integrations/coingecko-post-processing/config.example.json
+++ b/packages/airnode-examples/integrations/coingecko-post-processing/config.example.json
@@ -78,7 +78,7 @@
   "templates": [],
   "ois": [
     {
-      "oisFormat": "1.2.0",
+      "oisFormat": "1.3.0",
       "title": "CoinGecko coins markets request",
       "version": "1.0.0",
       "apiSpecifications": {
diff --git a/packages/airnode-examples/integrations/coingecko-post-processing/create-config.ts b/packages/airnode-examples/integrations/coingecko-post-processing/create-config.ts
index b491e15d92..daf6173e06 100644
--- a/packages/airnode-examples/integrations/coingecko-post-processing/create-config.ts
+++ b/packages/airnode-examples/integrations/coingecko-post-processing/create-config.ts
@@ -85,7 +85,7 @@ const createConfig = async (generateExampleFile: boolean): Promise<Config> => ({
   templates: [],
   ois: [
     {
-      oisFormat: '1.2.0',
+      oisFormat: '1.3.0',
       title: 'CoinGecko coins markets request',
       version: '1.0.0',
       apiSpecifications: {
diff --git a/packages/airnode-examples/integrations/coingecko-pre-processing/config.example.json b/packages/airnode-examples/integrations/coingecko-pre-processing/config.example.json
index 8c0c6cb1bc..3be4e5579e 100644
--- a/packages/airnode-examples/integrations/coingecko-pre-processing/config.example.json
+++ b/packages/airnode-examples/integrations/coingecko-pre-processing/config.example.json
@@ -78,7 +78,7 @@
   "templates": [],
   "ois": [
     {
-      "oisFormat": "1.2.0",
+      "oisFormat": "1.3.0",
       "title": "CoinGecko history data request",
       "version": "1.0.0",
       "apiSpecifications": {
diff --git a/packages/airnode-examples/integrations/coingecko-pre-processing/create-config.ts b/packages/airnode-examples/integrations/coingecko-pre-processing/create-config.ts
index 0515af2a29..d1e8481afa 100644
--- a/packages/airnode-examples/integrations/coingecko-pre-processing/create-config.ts
+++ b/packages/airnode-examples/integrations/coingecko-pre-processing/create-config.ts
@@ -85,7 +85,7 @@ const createConfig = async (generateExampleFile: boolean): Promise<Config> => ({
   templates: [],
   ois: [
     {
-      oisFormat: '1.2.0',
+      oisFormat: '1.3.0',
       title: 'CoinGecko history data request',
       version: '1.0.0',
       apiSpecifications: {
diff --git a/packages/airnode-examples/integrations/coingecko-signed-data/config.example.json b/packages/airnode-examples/integrations/coingecko-signed-data/config.example.json
index ec69799c20..6fc754a614 100644
--- a/packages/airnode-examples/integrations/coingecko-signed-data/config.example.json
+++ b/packages/airnode-examples/integrations/coingecko-signed-data/config.example.json
@@ -86,7 +86,7 @@
   "templates": [],
   "ois": [
     {
-      "oisFormat": "1.2.0",
+      "oisFormat": "1.3.0",
       "title": "CoinGecko basic request",
       "version": "1.0.0",
       "apiSpecifications": {
diff --git a/packages/airnode-examples/integrations/coingecko-signed-data/create-config.ts b/packages/airnode-examples/integrations/coingecko-signed-data/create-config.ts
index b50689c2ad..48e33fe7f1 100644
--- a/packages/airnode-examples/integrations/coingecko-signed-data/create-config.ts
+++ b/packages/airnode-examples/integrations/coingecko-signed-data/create-config.ts
@@ -93,7 +93,7 @@ const createConfig = async (generateExampleFile: boolean): Promise<Config> => ({
   templates: [],
   ois: [
     {
-      oisFormat: '1.2.0',
+      oisFormat: '1.3.0',
       title: 'CoinGecko basic request',
       version: '1.0.0',
       apiSpecifications: {
diff --git a/packages/airnode-examples/integrations/coingecko-template/config.example.json b/packages/airnode-examples/integrations/coingecko-template/config.example.json
index 54a4e4d3b7..44cd19b80d 100644
--- a/packages/airnode-examples/integrations/coingecko-template/config.example.json
+++ b/packages/airnode-examples/integrations/coingecko-template/config.example.json
@@ -84,7 +84,7 @@
   ],
   "ois": [
     {
-      "oisFormat": "1.2.0",
+      "oisFormat": "1.3.0",
       "title": "CoinGecko basic request",
       "version": "1.0.0",
       "apiSpecifications": {
diff --git a/packages/airnode-examples/integrations/coingecko-template/create-config.ts b/packages/airnode-examples/integrations/coingecko-template/create-config.ts
index 9fc74d61a5..be9319f30a 100644
--- a/packages/airnode-examples/integrations/coingecko-template/create-config.ts
+++ b/packages/airnode-examples/integrations/coingecko-template/create-config.ts
@@ -93,7 +93,7 @@ const createConfig = async (generateExampleFile: boolean): Promise<Config> => ({
   ],
   ois: [
     {
-      oisFormat: '1.2.0',
+      oisFormat: '1.3.0',
       title: 'CoinGecko basic request',
       version: '1.0.0',
       apiSpecifications: {
diff --git a/packages/airnode-examples/integrations/coingecko-testable/config.example.json b/packages/airnode-examples/integrations/coingecko-testable/config.example.json
index 2b313d3a1d..979d087738 100644
--- a/packages/airnode-examples/integrations/coingecko-testable/config.example.json
+++ b/packages/airnode-examples/integrations/coingecko-testable/config.example.json
@@ -86,7 +86,7 @@
   "templates": [],
   "ois": [
     {
-      "oisFormat": "1.2.0",
+      "oisFormat": "1.3.0",
       "title": "CoinGecko basic request",
       "version": "1.0.0",
       "apiSpecifications": {
diff --git a/packages/airnode-examples/integrations/coingecko-testable/create-config.ts b/packages/airnode-examples/integrations/coingecko-testable/create-config.ts
index 7a4b305d3c..e9cf107d2f 100644
--- a/packages/airnode-examples/integrations/coingecko-testable/create-config.ts
+++ b/packages/airnode-examples/integrations/coingecko-testable/create-config.ts
@@ -93,7 +93,7 @@ const createConfig = async (generateExampleFile: boolean): Promise<Config> => ({
   templates: [],
   ois: [
     {
-      oisFormat: '1.2.0',
+      oisFormat: '1.3.0',
       title: 'CoinGecko basic request',
       version: '1.0.0',
       apiSpecifications: {
diff --git a/packages/airnode-examples/integrations/coingecko/config.example.json b/packages/airnode-examples/integrations/coingecko/config.example.json
index 3c4dc3bd26..415333febe 100644
--- a/packages/airnode-examples/integrations/coingecko/config.example.json
+++ b/packages/airnode-examples/integrations/coingecko/config.example.json
@@ -78,7 +78,7 @@
   "templates": [],
   "ois": [
     {
-      "oisFormat": "1.2.0",
+      "oisFormat": "1.3.0",
       "title": "CoinGecko basic request",
       "version": "1.0.0",
       "apiSpecifications": {
diff --git a/packages/airnode-examples/integrations/coingecko/create-config.ts b/packages/airnode-examples/integrations/coingecko/create-config.ts
index 3d09555f3c..68a2f4928d 100644
--- a/packages/airnode-examples/integrations/coingecko/create-config.ts
+++ b/packages/airnode-examples/integrations/coingecko/create-config.ts
@@ -85,7 +85,7 @@ const createConfig = async (generateExampleFile: boolean): Promise<Config> => ({
   templates: [],
   ois: [
     {
-      oisFormat: '1.2.0',
+      oisFormat: '1.3.0',
       title: 'CoinGecko basic request',
       version: '1.0.0',
       apiSpecifications: {
diff --git a/packages/airnode-examples/integrations/failing-example/config.example.json b/packages/airnode-examples/integrations/failing-example/config.example.json
index fe1f94954d..955dce399b 100644
--- a/packages/airnode-examples/integrations/failing-example/config.example.json
+++ b/packages/airnode-examples/integrations/failing-example/config.example.json
@@ -78,7 +78,7 @@
   "templates": [],
   "ois": [
     {
-      "oisFormat": "1.2.0",
+      "oisFormat": "1.3.0",
       "title": "Failure Example",
       "version": "1.0.0",
       "apiSpecifications": {
diff --git a/packages/airnode-examples/integrations/failing-example/create-config.ts b/packages/airnode-examples/integrations/failing-example/create-config.ts
index bd88389bc5..693502fd25 100644
--- a/packages/airnode-examples/integrations/failing-example/create-config.ts
+++ b/packages/airnode-examples/integrations/failing-example/create-config.ts
@@ -85,7 +85,7 @@ const createConfig = async (generateExampleFile: boolean): Promise<Config> => ({
   templates: [],
   ois: [
     {
-      oisFormat: '1.2.0',
+      oisFormat: '1.3.0',
       title: 'Failure Example',
       version: '1.0.0',
       apiSpecifications: {
diff --git a/packages/airnode-examples/integrations/relay-security-schemes/config.example.json b/packages/airnode-examples/integrations/relay-security-schemes/config.example.json
index 7e3120b5da..2ce4592727 100644
--- a/packages/airnode-examples/integrations/relay-security-schemes/config.example.json
+++ b/packages/airnode-examples/integrations/relay-security-schemes/config.example.json
@@ -78,7 +78,7 @@
   "templates": [],
   "ois": [
     {
-      "oisFormat": "1.2.0",
+      "oisFormat": "1.3.0",
       "title": "Relay Security Schemes via httpbin",
       "version": "1.0.0",
       "apiSpecifications": {
diff --git a/packages/airnode-examples/integrations/relay-security-schemes/create-config.ts b/packages/airnode-examples/integrations/relay-security-schemes/create-config.ts
index 4e0ea52cd0..6937a4ffe8 100644
--- a/packages/airnode-examples/integrations/relay-security-schemes/create-config.ts
+++ b/packages/airnode-examples/integrations/relay-security-schemes/create-config.ts
@@ -85,7 +85,7 @@ const createConfig = async (generateExampleFile: boolean): Promise<Config> => ({
   templates: [],
   ois: [
     {
-      oisFormat: '1.2.0',
+      oisFormat: '1.3.0',
       title: 'Relay Security Schemes via httpbin',
       version: '1.0.0',
       apiSpecifications: {
diff --git a/packages/airnode-examples/integrations/weather-multi-value/config.example.json b/packages/airnode-examples/integrations/weather-multi-value/config.example.json
index ab52079bc6..02a813a161 100644
--- a/packages/airnode-examples/integrations/weather-multi-value/config.example.json
+++ b/packages/airnode-examples/integrations/weather-multi-value/config.example.json
@@ -78,7 +78,7 @@
   "templates": [],
   "ois": [
     {
-      "oisFormat": "1.2.0",
+      "oisFormat": "1.3.0",
       "title": "OpenWeather Multiple Encoded Values",
       "version": "1.0.0",
       "apiSpecifications": {
diff --git a/packages/airnode-examples/integrations/weather-multi-value/create-config.ts b/packages/airnode-examples/integrations/weather-multi-value/create-config.ts
index 23c52e93df..1ed8bbf5ba 100644
--- a/packages/airnode-examples/integrations/weather-multi-value/create-config.ts
+++ b/packages/airnode-examples/integrations/weather-multi-value/create-config.ts
@@ -85,7 +85,7 @@ const createConfig = async (generateExampleFile: boolean): Promise<Config> => ({
   templates: [],
   ois: [
     {
-      oisFormat: '1.2.0',
+      oisFormat: '1.3.0',
       title: 'OpenWeather Multiple Encoded Values',
       version: '1.0.0',
       apiSpecifications: {
diff --git a/packages/airnode-node/config/config.example.json b/packages/airnode-node/config/config.example.json
index dd24136078..7c17209f07 100644
--- a/packages/airnode-node/config/config.example.json
+++ b/packages/airnode-node/config/config.example.json
@@ -79,7 +79,7 @@
   "templates": [],
   "ois": [
     {
-      "oisFormat": "1.2.0",
+      "oisFormat": "1.3.0",
       "version": "1.2.3",
       "title": "Currency Converter API",
       "apiSpecifications": {
diff --git a/packages/airnode-node/package.json b/packages/airnode-node/package.json
index cdafcc7eeb..30de5b2b24 100644
--- a/packages/airnode-node/package.json
+++ b/packages/airnode-node/package.json
@@ -29,7 +29,7 @@
     "@api3/airnode-protocol": "^0.9.0",
     "@api3/airnode-utilities": "^0.9.0",
     "@api3/airnode-validator": "^0.9.0",
-    "@api3/ois": "1.2.0",
+    "@api3/ois": "1.3.0",
     "@api3/promise-utils": "^0.3.0",
     "aws-sdk": "^2.1243.0",
     "dotenv": "^16.0.3",
diff --git a/packages/airnode-node/src/api/index.test.ts b/packages/airnode-node/src/api/index.test.ts
index 47ab7c1a35..d511004d3c 100644
--- a/packages/airnode-node/src/api/index.test.ts
+++ b/packages/airnode-node/src/api/index.test.ts
@@ -414,6 +414,175 @@ describe('callApi', () => {
       );
     });
   });
+  describe('skip API call', () => {
+    const createEncodedValue = (value: ethers.BigNumber, times = 100_000) =>
+      `0x${value.mul(times).toHexString().substring(2).padStart(64, '0')}`;
+
+    it('skips the API call with preProcessingSpecifications', async () => {
+      const config = fixtures.buildConfig();
+      const parameters = { _type: 'int256', _path: 'result', parameter1: '25' };
+      const aggregatedApiCall = fixtures.buildAggregatedRegularApiCall({ parameters });
+      const preProcessingSpecifications = [
+        {
+          environment: 'Node 14' as const,
+          value: 'const output = { result: (parseInt(input.parameter1) * 2).toString() }',
+          timeoutMs: 5000,
+        },
+      ];
+
+      config.ois[0].endpoints[0].operation = undefined;
+      config.ois[0].endpoints[0].fixedOperationParameters = [];
+      config.ois[0].endpoints[0].preProcessingSpecifications = preProcessingSpecifications;
+
+      const [logs, res] = await callApi({
+        type: 'regular',
+        config,
+        aggregatedApiCall,
+      });
+
+      expect(logs).toEqual([]);
+      expect(res).toEqual({
+        success: true,
+        data: {
+          encodedValue: createEncodedValue(ethers.BigNumber.from(25 * 2)),
+          signature:
+            '0x148d65210b201c3ddd6f8e08cfc29032e9f3c781919eeb80b950dbb984ebbbee289105ea8b591ace166d04b65e334801ea0177bb431775db2b4268d55fa4e2a81c',
+        },
+      });
+    });
+
+    it('skips the API call with postProcessingSpecifications', async () => {
+      const config = fixtures.buildConfig();
+      const parameters = { _type: 'int256', _path: 'result', parameter1: '25' };
+      const aggregatedApiCall = fixtures.buildAggregatedRegularApiCall({ parameters });
+      const postProcessingSpecifications = [
+        {
+          environment: 'Node 14' as const,
+          value: 'const output = { result: (parseInt(input.parameter1) * 2).toString() }',
+          timeoutMs: 5000,
+        },
+      ];
+
+      config.ois[0].endpoints[0].operation = undefined;
+      config.ois[0].endpoints[0].fixedOperationParameters = [];
+      config.ois[0].endpoints[0].postProcessingSpecifications = postProcessingSpecifications;
+
+      const [logs, res] = await callApi({
+        type: 'regular',
+        config,
+        aggregatedApiCall,
+      });
+
+      expect(logs).toEqual([]);
+      expect(res).toEqual({
+        success: true,
+        data: {
+          encodedValue: createEncodedValue(ethers.BigNumber.from(25 * 2)),
+          signature:
+            '0x148d65210b201c3ddd6f8e08cfc29032e9f3c781919eeb80b950dbb984ebbbee289105ea8b591ace166d04b65e334801ea0177bb431775db2b4268d55fa4e2a81c',
+        },
+      });
+    });
+
+    it('skips API call with both preProcessingSpecifications and postProcessingSpecifications', async () => {
+      const config = fixtures.buildConfig();
+      const parameters = { _type: 'int256', _path: 'result', parameter1: '25' };
+      const aggregatedApiCall = fixtures.buildAggregatedRegularApiCall({ parameters });
+      const preProcessingSpecifications = [
+        {
+          environment: 'Node 14' as const,
+          value: 'const output = {...input, addThis: "5" }',
+          timeoutMs: 5000,
+        },
+      ];
+      const postProcessingSpecifications = [
+        {
+          environment: 'Node 14' as const,
+          value: 'const output = { result: (parseInt(input.parameter1) * 2 + parseInt(input.addThis)).toString() }',
+          timeoutMs: 5000,
+        },
+      ];
+
+      config.ois[0].endpoints[0].operation = undefined;
+      config.ois[0].endpoints[0].fixedOperationParameters = [];
+      config.ois[0].endpoints[0].preProcessingSpecifications = preProcessingSpecifications;
+      config.ois[0].endpoints[0].postProcessingSpecifications = postProcessingSpecifications;
+
+      const [logs, res] = await callApi({
+        type: 'regular',
+        config,
+        aggregatedApiCall,
+      });
+
+      expect(logs).toEqual([]);
+      expect(res).toEqual({
+        success: true,
+        data: {
+          encodedValue: createEncodedValue(ethers.BigNumber.from(25 * 2 + 5)),
+          signature:
+            '0x9796e8ba07c517a43b2ca1416b9c975541345c5b7bf73613738ed84216c4573d1656cbc385acb9111b7077fba65418b59cfe3f59ee81109523664bbc25efcfd71b',
+        },
+      });
+    });
+
+    it('fails when both preProcessingSpecifications and postProcessingSpecifications are empty', async () => {
+      const config = fixtures.buildConfig();
+      const parameters = { _type: 'int256', _path: 'result', parameter1: '25' };
+      const aggregatedApiCall = fixtures.buildAggregatedRegularApiCall({ parameters });
+
+      config.ois[0].endpoints[0].operation = undefined;
+      config.ois[0].endpoints[0].fixedOperationParameters = [];
+      config.ois[0].endpoints[0].preProcessingSpecifications = [];
+      config.ois[0].endpoints[0].postProcessingSpecifications = [];
+
+      const [logs, res] = await callApi({
+        type: 'regular',
+        config,
+        aggregatedApiCall,
+      });
+
+      expect(logs).toEqual([
+        {
+          level: 'ERROR',
+          message:
+            "Failed to skip API call. Ensure at least one of 'preProcessingSpecifications' or 'postProcessingSpecifications' is defined and is not an empty array at ois 'Currency Converter API', endpoint 'convertToUSD'.",
+        },
+      ]);
+      expect(res).toEqual({
+        success: false,
+        errorMessage: `Failed to skip API call. Ensure at least one of 'preProcessingSpecifications' or 'postProcessingSpecifications' is defined and is not an empty array at ois 'Currency Converter API', endpoint 'convertToUSD'.`,
+      });
+    });
+
+    it('fails when both preProcessingSpecifications and postProcessingSpecifications are undefined', async () => {
+      const config = fixtures.buildConfig();
+      const parameters = { _type: 'int256', _path: 'result', parameter1: '25' };
+      const aggregatedApiCall = fixtures.buildAggregatedRegularApiCall({ parameters });
+
+      config.ois[0].endpoints[0].operation = undefined;
+      config.ois[0].endpoints[0].fixedOperationParameters = [];
+      config.ois[0].endpoints[0].preProcessingSpecifications = undefined;
+      config.ois[0].endpoints[0].postProcessingSpecifications = undefined;
+
+      const [logs, res] = await callApi({
+        type: 'regular',
+        config,
+        aggregatedApiCall,
+      });
+
+      expect(logs).toEqual([
+        {
+          level: 'ERROR',
+          message:
+            "Failed to skip API call. Ensure at least one of 'preProcessingSpecifications' or 'postProcessingSpecifications' is defined and is not an empty array at ois 'Currency Converter API', endpoint 'convertToUSD'.",
+        },
+      ]);
+      expect(res).toEqual({
+        success: false,
+        errorMessage: `Failed to skip API call. Ensure at least one of 'preProcessingSpecifications' or 'postProcessingSpecifications' is defined and is not an empty array at ois 'Currency Converter API', endpoint 'convertToUSD'.`,
+      });
+    });
+  });
 });
 
 describe('verifyTemplateId', () => {
diff --git a/packages/airnode-node/src/api/index.ts b/packages/airnode-node/src/api/index.ts
index 32905e5d4a..506eacd8b8 100644
--- a/packages/airnode-node/src/api/index.ts
+++ b/packages/airnode-node/src/api/index.ts
@@ -1,5 +1,6 @@
 import * as adapter from '@api3/airnode-adapter';
-import { RESERVED_PARAMETERS } from '@api3/ois';
+import isEmpty from 'lodash/isEmpty';
+import { OIS, RESERVED_PARAMETERS, Endpoint } from '@api3/ois';
 import { logger, removeKeys, removeKey } from '@api3/airnode-utilities';
 import { go, goSync } from '@api3/promise-utils';
 import axios, { AxiosError } from 'axios';
@@ -287,11 +288,25 @@ export async function callApi(payload: ApiCallPayload): Promise<LogsData<ApiCall
   if (verificationResult) return verificationResult;
 
   const processedPayload = await preProcessApiSpecifications(payload);
+  const ois = payload.config.ois.find((o: OIS) => o.title === payload.aggregatedApiCall.oisTitle)!;
+  const endpoint = ois.endpoints.find((e: Endpoint) => e.name === payload.aggregatedApiCall.endpointName)!;
+
+  // skip API call if operation is undefined and fixedOperationParameters is empty array
+  if (!endpoint.operation && isEmpty(endpoint.fixedOperationParameters)) {
+    // contents of preProcessingSpecifications or postProcessingSpecifications (or both) will simulate an API when API call is skipped
+    if (isEmpty(endpoint.preProcessingSpecifications) && isEmpty(endpoint.postProcessingSpecifications)) {
+      const message = `Failed to skip API call. Ensure at least one of 'preProcessingSpecifications' or 'postProcessingSpecifications' is defined and is not an empty array at ois '${payload.aggregatedApiCall.oisTitle}', endpoint '${payload.aggregatedApiCall.endpointName}'.`;
+      const log = logger.pend('ERROR', message);
+      return [[log], { success: false, errorMessage: message }];
+    }
+    // output of preProcessingSpecifications can be used as output directly or
+    // preProcessingSpecifications can be used to manipulate parameters to use in postProcessingSpecifications
+    return processSuccessfulApiCall(payload, { data: processedPayload.aggregatedApiCall.parameters });
+  }
 
   const [logs, response] = await performApiCall(processedPayload);
   if (isPerformApiCallFailure(response)) {
     return [logs, response];
   }
-
   return processSuccessfulApiCall(payload, response);
 }
diff --git a/packages/airnode-node/test/fixtures/config/ois.ts b/packages/airnode-node/test/fixtures/config/ois.ts
index 629d32d723..606afa9169 100644
--- a/packages/airnode-node/test/fixtures/config/ois.ts
+++ b/packages/airnode-node/test/fixtures/config/ois.ts
@@ -2,7 +2,7 @@ import { OIS } from '@api3/ois';
 
 export function buildOIS(ois?: Partial<OIS>): OIS {
   return {
-    oisFormat: '1.2.0',
+    oisFormat: '1.3.0',
     version: '1.2.3',
     title: 'Currency Converter API',
     apiSpecifications: {
diff --git a/packages/airnode-validator/package.json b/packages/airnode-validator/package.json
index 2dd464bcfe..e47f841a35 100644
--- a/packages/airnode-validator/package.json
+++ b/packages/airnode-validator/package.json
@@ -21,7 +21,7 @@
     "test:e2e:update-snapshot": "yarn test:e2e --updateSnapshot"
   },
   "dependencies": {
-    "@api3/ois": "1.2.0",
+    "@api3/ois": "1.3.0",
     "@api3/promise-utils": "^0.3.0",
     "dotenv": "^16.0.3",
     "ethers": "^5.7.2",
diff --git a/packages/airnode-validator/test/fixtures/config.valid.json b/packages/airnode-validator/test/fixtures/config.valid.json
index c25562f0b3..981bf020fc 100644
--- a/packages/airnode-validator/test/fixtures/config.valid.json
+++ b/packages/airnode-validator/test/fixtures/config.valid.json
@@ -79,7 +79,7 @@
   "templates": [],
   "ois": [
     {
-      "oisFormat": "1.2.0",
+      "oisFormat": "1.3.0",
       "title": "CoinGecko basic request",
       "version": "1.0.0",
       "apiSpecifications": {
diff --git a/packages/airnode-validator/test/fixtures/interpolated-config.valid.json b/packages/airnode-validator/test/fixtures/interpolated-config.valid.json
index 7d71136ad2..50650ac7f4 100644
--- a/packages/airnode-validator/test/fixtures/interpolated-config.valid.json
+++ b/packages/airnode-validator/test/fixtures/interpolated-config.valid.json
@@ -83,7 +83,7 @@
   "templates": [],
   "ois": [
     {
-      "oisFormat": "1.2.0",
+      "oisFormat": "1.3.0",
       "title": "CoinGecko basic request",
       "version": "1.0.0",
       "apiSpecifications": {
diff --git a/packages/airnode-validator/test/fixtures/invalid-secret-name/config.json b/packages/airnode-validator/test/fixtures/invalid-secret-name/config.json
index a003da66b3..57a308f0f9 100644
--- a/packages/airnode-validator/test/fixtures/invalid-secret-name/config.json
+++ b/packages/airnode-validator/test/fixtures/invalid-secret-name/config.json
@@ -67,7 +67,7 @@
   "templates": [],
   "ois": [
     {
-      "oisFormat": "1.2.0",
+      "oisFormat": "1.3.0",
       "title": "CoinGecko basic request",
       "version": "1.0.0",
       "apiSpecifications": {
diff --git a/packages/airnode-validator/test/fixtures/ois.json b/packages/airnode-validator/test/fixtures/ois.json
index 6fc78fd197..f97d2d2357 100644
--- a/packages/airnode-validator/test/fixtures/ois.json
+++ b/packages/airnode-validator/test/fixtures/ois.json
@@ -1,5 +1,5 @@
 {
-  "oisFormat": "1.2.0",
+  "oisFormat": "1.3.0",
   "version": "1.2.3",
   "title": "coinlayer",
   "apiSpecifications": {
diff --git a/yarn.lock b/yarn.lock
index c2aae13a14..f1ce386821 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -10,10 +10,10 @@
     "@jridgewell/gen-mapping" "^0.1.0"
     "@jridgewell/trace-mapping" "^0.3.9"
 
-"@api3/ois@1.2.0":
-  version "1.2.0"
-  resolved "https://registry.yarnpkg.com/@api3/ois/-/ois-1.2.0.tgz#752894b7cd2968a53437b9abaa9aef07968359d3"
-  integrity sha512-K3d873YhmLCqL0L5op9LBtgPIgcGicC4pNq34olCjhACh3TaowNNk3mFvZrRgUj/TdapiAKvtPtPtvnj1KO2zw==
+"@api3/ois@1.3.0":
+  version "1.3.0"
+  resolved "https://registry.yarnpkg.com/@api3/ois/-/ois-1.3.0.tgz#3780a1bcd439e2fdb1316955d97f5124311ad316"
+  integrity sha512-fdUsK1WwVN6FJUPPwDWpjyJNTg2MCaWYej8rr4bIoFMPvBre9ow7vKMw99+qdAS1P5CZP0Yvba14yacy3f3P4w==
   dependencies:
     lodash "^4.17.21"
     zod "^3.19.1"
@@ -4108,14 +4108,7 @@ aws4@^1.8.0:
   resolved "https://registry.yarnpkg.com/aws4/-/aws4-1.11.0.tgz#d61f46d83b2519250e2784daf5b09479a8b41c59"
   integrity sha512-xh1Rl34h6Fi1DC2WWKfxUTVqRsNnr6LsKz2+hfwDxQJWmrx8+c7ylaqBMcHfl1U1r2dsifOvKX3LQuLNZ+XSvA==
 
-axios@^0.21.0, axios@^0.21.1:
-  version "0.21.4"
-  resolved "https://registry.yarnpkg.com/axios/-/axios-0.21.4.tgz#c67b90dc0568e5c1cf2b0b858c43ba28e2eda575"
-  integrity sha512-ut5vewkiu8jjGBdqpM44XxjuCjq9LAKeHVmoVfHVzy8eHgxxq8SbAVQNovDA8mVi05kP0Ea/n/UzcSHcTJQfNg==
-  dependencies:
-    follow-redirects "^1.14.0"
-
-axios@^1.0.0, axios@^1.1.3:
+axios@1.1.3, axios@^1.0.0:
   version "1.1.3"
   resolved "https://registry.yarnpkg.com/axios/-/axios-1.1.3.tgz#8274250dada2edf53814ed7db644b9c2866c1e35"
   integrity sha512-00tXVRwKx/FZr/IDVFt4C+f9FYairX517WoGCL6dpOntqLkZofjhu43F/Xl44UOpqa+9sLFDrG/XAnFsUYgkDA==
@@ -4124,6 +4117,13 @@ axios@^1.0.0, axios@^1.1.3:
     form-data "^4.0.0"
     proxy-from-env "^1.1.0"
 
+axios@^0.21.0, axios@^0.21.1:
+  version "0.21.4"
+  resolved "https://registry.yarnpkg.com/axios/-/axios-0.21.4.tgz#c67b90dc0568e5c1cf2b0b858c43ba28e2eda575"
+  integrity sha512-ut5vewkiu8jjGBdqpM44XxjuCjq9LAKeHVmoVfHVzy8eHgxxq8SbAVQNovDA8mVi05kP0Ea/n/UzcSHcTJQfNg==
+  dependencies:
+    follow-redirects "^1.14.0"
+
 babel-code-frame@^6.26.0:
   version "6.26.0"
   resolved "https://registry.yarnpkg.com/babel-code-frame/-/babel-code-frame-6.26.0.tgz#63fd43f7dc1e3bb7ce35947db8fe369a3f58c74b"