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Paymaster Check
x402
Paymaster Check is a paid API for AI agents from 402.com.tr, paid per call via x402, $0.05/call, status unknown (last checked 2026-09-14).
Audits a paymaster address for health, activity, and gas sponsorship quality across both ERC-4337 EntryPoints over a configurable lookback period
Price / call$0.05
Success—
StatusUnknown
How this service works
🆕 Given a paymaster address, audits whether it's a healthy, active gas sponsor. Reads its UserOperationEvents across both EntryPoints: sponsored op volume, distinct accounts served, success rate, total gas sponsored, and concentration (the share coming from its single busiest app). The read to run before integrating a paymaster (Coinbase / Pimlico / Alchemy / custom), or judging who funds a counterparty's gas. paymaster= required, days= optional (default 30, max 90). Not financial advice.
Output
A health audit of the paymaster including: total sponsored UserOperations volume, number of distinct accounts served, transaction success rate, total gas sponsored, and a concentration score showing what share of activity comes from its busiest single application — all computed from on-chain UserOperationEvents across both ERC-4337 EntryPoints for the specified lookback window.
Example use cases
Pre-integration paymaster due diligence
“Before we integrate Pimlico's paymaster at 0xc03...abc into our app, can you audit it for the past 30 days and tell me the sponsored op volume, success rate, and whether it's dangerously concentrated on one app?”
Counterparty gas funding investigation
“I'm looking at a wallet that seems to have its gas sponsored — can you check the paymaster address 0xd7f...123 to see how active and trustworthy it is over the last 60 days?”
Evaluating a custom paymaster before launch
“We built a custom paymaster at 0xabc...def and it's been live for 3 weeks — can you run a health check on it for the past 21 days and tell me how many distinct accounts it's served and what its success rate looks like?”
Technical details
Endpoint
GEThttps://402.com.tr/api/x402/paymaster-checkWhen to prefer
Choose this endpoint when you need on-chain, objective health metrics for a specific paymaster address before integrating it into a smart account application, or when evaluating the trustworthiness of a gas sponsor funding a counterparty. Prefer this over generic block explorers or manual event log queries when you want pre-aggregated metrics (success rate, concentration, distinct accounts) across both EntryPoints in a single call. Best for ERC-4337 / account abstraction contexts on Base.
Side effects
- Missing required paymaster address returns 400 error
- Invalid or non-checksummed address may return no results or error
- Newly deployed paymaster with no history returns empty/zero metrics
- days parameter exceeding 90 is clamped or rejected
- Rate limits or payment failure returns 402 error
- Non-paymaster address (EOA or unrelated contract) returns empty metrics
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Tags
x402
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