Using this API developers can self sign custom contracts.

This API is compliant with the latest EIP-712 spec. and is a drop in replacement for Metamask's signTypedData_v4 API.

{
     "reason": "Submit Bid on My Amazing dApp",
     "data": {
            "types": {
                "EIP712Domain": [
                    {
                        "name": "name",
                        "type": "string"
                    },
                    {
                        "name": "version",
                        "type": "string"
                    },
                    {
                        "name": "chainId",
                        "type": "uint256"
                    },
                    {
                        "name": "verifyingContract",
                        "type": "address"
                    },
                    {
                        "name": "salt",
                        "type": "bytes32"
                    }
                ],
                "Bid": [
                    {
                        "name": "amount",
                        "type": "uint256"
                    },
                    {
                        "name": "bidder",
                        "type": "Identity"
                    }
                ],
                "Identity": [
                    {
                        "name": "userId",
                        "type": "uint256"
                    },
                    {
                        "name": "wallet",
                        "type": "address"
                    }
                ]
            },
            "domain": {
                "name": "My amazing dApp",
                "version": "2",
                "chainId": 1,
                "verifyingContract": "0x1C56346CD2A2Bf3202F771f50d3D14a367B48070",
                "salt": "0xf2d857f4a3edcb9b78b4d503bfe733db1e3f6cdc2b7971ee739626c97e86a558"
            },
            "primaryType": "Bid",
            "message": {
                "amount": 100,
                "bidder": {
                    "userId": 323,
                    "wallet": "0x3333333333333333333333333333333333333333"
                }
            }
     }
}

{
  "status": "SUCCESS",
  "signature": "0x23822278aeb03a90c3ae92304ef5f0c652d1300836bdd52827c7fb227ccb3e465aba54dffbf59c61a84e96cc0ff3db9e257e07068c54543af94db96798c6e7d31c",
  "r": "0x23822278aeb03a90c3ae92304ef5f0c652d1300836bdd52827c7fb227ccb3e46",
  "s": "0x5aba54dffbf59c61a84e96cc0ff3db9e257e07068c54543af94db96798c6e7d3",
  "v": "0x1c"
}
/**
Signature is a hex encoded 65 byte array starting with 0x.
It encodes the r, s and v parameters from appendix F of the yellow paper in big-endian format.
Bytes 0…32 contain the r parameter, bytes 32…64 the s parameter and the last byte the v parameter.
Note that the v parameter includes the chain id as specified in EIP-155.
**/

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Api Error Status
You can find error status returned by the api here.

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