Using StaticJsonRpcProvider instead of JsonRpcProvider

[leckylao]

• Because this PR includes a bug fix, relevant tests have been included.
• Because this PR includes a new feature, the change was previously discussed on an Issue or with someone from the team.
• I didn't do anything of this.

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This is a PR for issue discussed in #1938

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[alcuadrado]

Sorry we never got to this. I'm closing it as this is completely different now.