Sponsor UserOperation End Point

pm_sponsorUserOperation

All paymaster URLs allow you to use both Sponsorship and Token Paymasters. To switch between paymasters you will simply change the Mode of a specific request. We will highlight both types of requests below.

This endpoint is responsible for calculating the paymasterAndData field, if applicable, for the given request. The API accepts a partial UserOp and an optional token address. By examining the mode parameter in the request, it identifies the type of paymaster associated with the request and handles the processing accordingly, as described in the following.

Sponsorship Paymaster

To determine whether a request can be sponsored by the Sponsorship Paymaster, only consider the partial UserOp object and the sponsorshipInfo. If the request cannot be sponsored, the paymasterAndData will return "0x".

Token Paymaster

Consider both the partial UserOp and tokenAddress parameters in this case. If the tokenAddress is absent, an error will be thrown. If both are present, check for the TokenPaymaster flow and send the paymasterAndData response accordingly. If the tokenAddress is not supported, an error will also be thrown. Please see the error response at the end of this document.

Parameters

Body

Param	Type	Description	Required
method	string	Name of method in this case: pm_getFeeQuoteOrData	Required
params	array	An array consisting of the Useroperation object and Paymaster mode information	Required
id	string	id for request determined by client for JSON RPC requests	Required
jsonrpc	string	JSON RPC version in this case 2.0.0	Required

Params Array for Sponsorship requests

Index	Type	Description	Required
0	object	A partial userOperation object for the userOp that needs to be sponsored	Required
1	object	Mode specified as "SPONSORSHIP" as well as sposorship information which includes any webhook data and smart account information: name and version	Required

Params Array for ERC20 paymaster requests

Index	Type	Description	Required
0	object	A partial userOperation object for the userOp that needs to be sponsored	Required
1	object	Mode specified as "ERC20" as well as tokenInfo: a preferred token address and list of tokens to include	Required

note

"MODE" is mandatory for pm_sponsorUserOperation API,

• If "MODE" is SPONSORED, we check for request sponsorship. If a request cannot be sponsored, we return 0x. This would mean users will pay for their gas fees.
• If "MODE" is ERC20, we return paymasterAndData for TokenPaymaster. This would mean that users will pay in their preferred ERC20 Tokens

1. Mode is SPONSORED :

POST Request

{
    "id": 1,
    "jsonrpc": "2.0",
    "method": "pm_sponsorUserOperation",
    "params": [
        {
            sender, // address
            nonce, // uint256
            initCode, // string
            callData, // string
            callGasLimit, // string
            verificationGasLimit, // string
            preVerificationGas, // string
            maxFeePerGas, // string
            maxPriorityFeePerGas, // string
        },
        {
            "mode": "SPONSORED",
            "calculateGasLimits": true,
            "expiryDuration": 300 //5mins
            "sponsorshipInfo": {
                "webhookData": {},
                "smartAccountInfo": {
                    "name": "BICONOMY",
                    "version": "1.0.0"
                }
            }
        }
    ]
}

Response

Success Response

{
    "jsonrpc": "2.0",
    "id": 1,
    "result": {
        "MODE": "SPONSORED",
        "paymasterAndData": "0xdc91ffb7c4b800d70410a79a5b503ae4391f67e40000000000000000000000007306ac7a32eb690232de81a9ffb44bb346026fab00000000000000000000000000000000000000000000000000000000000000400000000000000000000000000000000000000000000000000000000000000041e1f74852c31150f18ef4e472b748148f8ae031849032218b26170414a18c9f99516eb13a4a9bd35d1334194348cccee3d270b6e7bb400b39f0c8d645266ead601c00000000000000000000000000000000000000000000000000000000000000",
        "preVerificationGas": "75388",
        "verificationGasLimit": 57121,
        "callGasLimit": 108848
    }
}

2. Mode is ERC20 :

POST Request:

{
    "jsonrpc": "2.0",
    "id": 14,
    "method": "pm_sponsorUserOperation",
    "params": [
        {
            sender, // address
            nonce, // uint256
            initCode, // string
            callData, // string
            maxFeePerGas, // string
            maxPriorityFeePerGas, // string
            //optional fields
            callGasLimit, // string
            verificationGasLimit, // string
            preVerificationGas, // string
        },
        {
            "calculateGasLimits": true,
            "mode": "ERC20",
            "tokenInfo": {
                "feeTokenAddress": "0xfd086bc7cd5c481dcc9c85ebe478a1c0b69fcbb9"
            }
        }
    ]
}

Response:

{
    "jsonrpc": "2.0",
    "id": 1,
    "result": {
        "MODE": "ERC20",
        "paymasterAndData": "0xdc91ffb7c4b800d70410a79a5b503ae4391f67e40000000000000000000000007306ac7a32eb690232de81a9ffb44bb346026fab00000000000000000000000000000000000000000000000000000000000000400000000000000000000000000000000000000000000000000000000000000041e1f74852c31150f18ef4e472b748148f8ae031849032218b26170414a18c9f99516eb13a4a9bd35d1334194348cccee3d270b6e7bb400b39f0c8d645266ead601c00000000000000000000000000000000000000000000000000000000000000",
        "preVerificationGas": "75388",
        "verificationGasLimit": 57121,
        "callGasLimit": 108848
    }
}

In response, the result field will contain paymasterAndData to be used in UserOp.