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Liquid Agent ERC-7677 Paymaster Data Provider
x402
Liquid Agent ERC-7677 Paymaster Data Provider is a paid API for AI agents from api.liquidagent.ai, paid per call via x402, $0.03/call, status unknown (last checked 2026-09-14).
Returns ERC-7677-compliant paymaster data (sponsor gas) for a user operation, enabling gasless transactions on behalf of Liquid Agent dollar-account holders.
Price / call$0.03
Success—
StatusUnknown
How this service works
A dollar account that puts your money on autopilot: earn yield, send money in seconds, and buy stocks from $1, all from one balance, with none of the crypto.
Output
A JSON object containing: the paymaster contract address (e.g. 0x9676897C…), a hex-encoded paymasterData blob to attach to the userOperation, a validUntil Unix timestamp indicating when the sponsorship expires, paymasterVerificationGasLimit and paymasterPostOpGasLimit as hex values. This data must be inserted into the userOperation before sending to a bundler.
Example use cases
Gasless smart account transaction
“My user is submitting a userOp on Base (chainId 8453) and I need paymaster data so they don't have to pay gas — call Liquid Agent's paymaster endpoint with the userOperation and entry point 0x5FF137D4b0FDCD49DcA30c7CF57E578a026d2789, and put the x402 payment object in the context.”
DApp gas abstraction for new users
“I'm onboarding new users to my DApp and I want to sponsor their first transaction gas fees — get me ERC-7677 paymaster data from Liquid Agent for this userOperation on chain 84532 so they don't need ETH in their wallet.”
Automated paymaster relay in agent workflow
“My AI agent is executing a recurring payment workflow and needs to fetch fresh paymasterData from Liquid Agent's paymaster before each bundler submission — here's the userOperation and the x402 payment authorization, please get the paymasterData and the validUntil timestamp.”
Technical details
Endpoint
POSThttps://api.liquidagent.ai/v1/gasWhen to prefer
Choose this endpoint when building ERC-4337 account abstraction flows that need ERC-7677-compliant gas sponsorship, specifically when your users hold a Liquid Agent dollar-account balance and you want to cover gas costs via an x402 micro-payment rather than managing your own paymaster infrastructure. Prefer this over generic paymaster services when you need tight integration with Liquid Agent's financial layer (yield, stock purchases, money transfers) and want a single balance to cover both app operations and gas fees.
Side effects
- Invalid or missing x402 payment object in context — returns 400 with payment required error
- Expired or insufficient x402 payment — paymaster rejects authorization
- Unsupported chainId — returns 400 or empty paymasterData
- Malformed userOperation structure — returns 422 validation error
- Entry point address mismatch — paymaster refuses to sign
- paymasterData returned with a validUntil already in the past if clock skew is extreme
- Network timeout on paymaster RPC — agent must retry
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| input | object | |
| output | object |
Output
Schema · Response
{
"type": "json"
}Tags
x402
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