Parcel market data collector subgraph.

This subgraph subscribes to the Opensea Exchange and to the Cryptovoxels Parcel contract. https://thegraph.com/legacy-explorer/subgraph/benjythebee/cryptovoxels-parcels

It listens to atomic matches from both buy and sell orders while listening to transfer events on the parcel contract.

It links the two events together.

A transfer is its own entity and may or may not have a saleEvent.

The current flow when listening is:

1. Parcel was transferred

• Create parcel object if non existant,
• Create transfer object
• Create transaction

2. New Atomic match event

• Create new SaleEvent
• Use transaction id to link to recent parcel transfer
• Add orders information and buyer / seller

3. New atomicMatch_ Call

• Get extra information such as price and all.

We gotta follow this issue: https://github.com/graphprotocol/graph-ts/issues/211 is not solved.

Some Opensea Enums:

• Side:
  • Buy : 0
  • Sell: 1

SaleKind:

• FixedPrice: 0
• DutchAuction: 1

Sources:

Opensea contract page:

https://etherscan.io/address/0x7be8076f4ea4a4ad08075c2508e481d6c946d12b#code

WyvernContract documentation:

https://docs.projectwyvern.com/docs/Exchange/

Typical Opensea tx: https://etherscan.io/tx/0xc4364dcfb016e277290036cd10f6c84a86f3758e2dea6bb6ce978d065dfb46cd

Subgraph: https://thegraph.com/legacy-explorer/subgraph/benjythebee/cryptovoxels-parcels

Query examples:

get first 10 orders

  orders(first: 10) {
    id
    invalid
    side
    saleKind
    transaction{
      date
    }
    maker {
      id
    }
    taker {
      id
    }
    basePrice
  }

get 100 saleEvents

{
saleEvents{
  buyOrder{
    side
    saleKind
    basePrice
    parcel{
      id
    }
    paymentToken{
      symbol
    }
    listingTime
    expirationTime
    maker{
      id
    }
    taker{
      id
    }
  }
  sellOrder{
    side
    saleKind
    basePrice
    parcel{
      id
    }
    paymentToken{
      symbol
    }
    listingTime
    expirationTime
    maker{
      id
    }
    taker{
      id
    }
  }
  transfer{
    from{
      id
    }
    to{
      id
    }
    date
    transaction{
      id
    }
  }
}
}