eth_contract_api

Uses Alchemy to invoke eth_call. From there it's just encoding/decoding the functions and args.

Limitations:

1. Only implemented uint, bool and address argument types. Just to limit scope and complexity for this exercise. Can be easily expanded to support all types here: https://docs.soliditylang.org/en/v0.7.0/abi-spec.html#types
2. Have not tested this super thoroughly, I'm sure there are a lot of bugs. But it does work.
3. Return type casting is brittle and needs more testing.
4. No real error handling on bad inputs, like malformed args, bad function name, unsupported return type.
5. User has to know what return type they want which is not ideal.

This API is live!

Invoke it in the browser or using curl.

curl -g \ --request GET \ --url "http://34.210.199.235:3001/contract/0xdAC17F958D2ee523a2206206994597C13D831ec7?func=balanceOf(address)&arguments=[%220x39bE25dDf6F7F5955bBDb8CC65Ca999746FD1a6A%22]&return_type=int"