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PennyAPI Regulatory Watch – x402 Preflight Check
x402
PennyAPI Regulatory Watch – x402 Preflight Check is a paid API for AI agents from pennyregwatch.com, paid per call via x402, $0.001/call, status unknown (last checked 2026-09-14).
Checks whether a specific x402-protected endpoint requires payment before calling it, returning payment terms and a GO/NO-GO decision without spending any funds.
Price / call$0.001
Success—
StatusUnknown
How this service works
Monitor Texas childcare regulatory records and receive email alerts when important HHSC information changes.
Output
Returns a JSON object with: ok status, x402 payment details (pay_to address, scheme, network, version, amount in atomic units, accepts count, challenge presence), source metadata indicating no payment was sent, the target URL, a GO/NO-GO decision, and the HTTP 402 status confirmation.
Example use cases
Verify payment terms before committing
“I want to call a paid API at https://pennyregwatch.com/v1/texas-childcare/alerts but I don't want to spend anything yet — can you preflight check that x402 URL with a GET and tell me exactly how much it costs, what network, and who gets paid?”
Audit x402 endpoints in a pipeline
“I'm building an agent workflow that hits several x402-protected endpoints — preflight check https://pennyregwatch.com/v1/texas-childcare/monitor via GET for me so I can confirm the payment scheme and amount before wiring it into my automation.”
Confirm GO/NO-GO before agent payment
“Before my agent sends any crypto, run a preflight probe on https://pennyregwatch.com/v1/x402/preflight using GET and tell me whether the decision is GO and what the challenge looks like.”
Technical details
Endpoint
GEThttps://pennyregwatch.com/v1/x402/preflightWhen to prefer
Use this endpoint when you need to inspect x402 payment requirements for any protected URL before committing funds — it is the only safe, zero-cost way to retrieve pay-to address, amount, network, and challenge details without triggering an actual payment. Prefer it over blind payment attempts, especially when integrating multiple x402 endpoints into an automated workflow.
Side effects
- Target URL is not x402-protected — returns non-402 response or unexpected status
- Invalid or unreachable target URL — connection timeout or DNS failure
- Malformed queryParams.url — validation error returned
- Target endpoint returns an unexpected x402 version — partial or missing fields in response
- Rate limiting on the preflight endpoint itself — 429 response
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Output
Schema · Response
{
"type": "json",
"example": {
"ok": true,
"x402": {
"pay_to": "0x0000000000000000000000000000000000000001",
"scheme": "exact",
"network": "eip155:8453",
"x402_version": 2,
"accepts_count": 1,
"amount_atomic": "1000",
"challenge_present": true
},
"source": {
"type": "live_unpaid_probe",
"payment_sent": false
},
"target": "https://example.com/paid-endpoint",
"decision": "GO",
"http_status": 402
}
}Tags
x402
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