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x402 Preflight Verifier
x402
x402 Preflight Verifier is a paid API for AI agents from bj7e26lfpo4fthvr35hczdipby.srv.us, paid per call via x402, $0.02/call, status unknown (last checked 2026-09-15).
Verifies an x402-gated HTTPS endpoint before payment: checks liveness, confirms the 402 response, parses payment terms, and reports whether the actual price matches your expected price.
Price / call$0.02
Success—
StatusUnknown
How this service works
Seven account-free paid tools for source integrity, x402 catalog search, preflight, liveness, routing, price drift, and batch verification.
Output
Returns a JSON object with: the verdict label (e.g. 'live_paid'), whether the endpoint is reachable, the HTTP status code observed, parsed payment terms (asset contract, pay-to address, network chain ID, amount), the price in USDC, whether the actual price matches the expected price you supplied, and a safe_to_pay boolean — giving the agent a clear go/no-go before executing payment.
Example use cases
Pre-payment safety check for agent
“My AI agent is about to pay for https://api.dataprovider.io/v1/weather to get weather data. Can you verify that endpoint is actually live, responds with 402, and is charging the 0.05 USDC I expect before it sends any payment?”
Detect price drift before automation
“I have an automated workflow that calls https://api.legalparse.io/v1/contracts/analyze for $2.00 USDC each time. Can you preflight it and tell me if the price has drifted from what I set up — I don't want surprise charges?”
Audit unknown x402 endpoint credentials
“Someone shared this x402 API with me — https://api.cryptodata.xyz/v1/nft/valuations — can you check whether it's actually reachable, what wallet address it pays to, which network it's on, and whether it's safe to pay?”
Technical details
Endpoint
GEThttps://bj7e26lfpo4fthvr35hczdipby.srv.us/v1/x402-preflightWhen to prefer
Use this endpoint when your agent needs a zero-cost, account-free preflight check before committing a micropayment to an x402-gated API. It is the right choice when you want to confirm liveness, validate payment terms (address, network, asset), and detect price drift before automating payments — especially for untrusted or newly discovered x402 endpoints. Prefer it over direct payment attempts when the cost of a mistaken payment or a call to a dead endpoint exceeds $0.02 USDC.
Side effects
- Endpoint is unreachable — verdict will reflect failed reachability and safe_to_pay will be false
- Endpoint does not return 402 — verdict will indicate it is not a live x402 endpoint
- Price drift detected — price_matches_expected will be false if actual price differs from expected_usdc
- Malformed or missing payment headers on the target endpoint — terms array may be empty or parsing may fail
- Invalid URL supplied — endpoint will return a validation error
- Target endpoint intermittently live — results may vary between calls if upstream is flaky
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Output
Schema · Response
{
"type": "json",
"example": {
"url": "https://api.govparse.io/v1/fcc/licenses/search",
"terms": [
{
"asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
"pay_to": "0x...",
"network": "eip155:8453",
"amount_usdc": 1.25
}
],
"verdict": "live_paid",
"reachable": true,
"price_usdc": 1.25,
"http_status": 402,
"safe_to_pay": true,
"expected_usdc": 1.25,
"preflightVersion": "1.0",
"price_matches_expected": true
}
}Tags
x402
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