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SafePay402 Guard - Pre-Payment Security Check
x402
SafePay402 Guard - Pre-Payment Security Check is a paid API for AI agents from guard.safepay402.com, paid per call via x402, $0.02/call, status unknown (last checked 2026-09-13).
Screens an x402 payment recipient and terms before funds are sent, returning an ALLOW/REVIEW/BLOCK/UNKNOWN verdict with a 0-100 risk score and named risk signals.
Price / call$0.02
Success—
StatusUnknown
How this service works
Pre-payment security checks for x402 payments. Explainable ALLOW/REVIEW/BLOCK/UNKNOWN verdicts with risk signals, before an AI agent sends funds. The paid endpoint is monetized via the x402 protocol (USDC on Base): an unpaid request returns HTTP 402 with payment requirements.
Output
Returns a verdict of ALLOW, REVIEW, BLOCK, or UNKNOWN, a numeric risk score from 0-100, and a list of named risk signals with sources — including OFAC sanctions hits, scam-address matches, on-chain wallet age and activity on Base, live re-verification of the 402 endpoint's current payee (detects hijacks), and behavioral flags like payee rotation or price spikes.
Example use cases
Example prompt
“Before you pay, run a SafePay402 guard check on this x402 request — the resource URL is https://api.example.com/data, the payee is 0xAbC123...456, network is eip155:8453 (Base), asset is USDC, and the amount is 0.025. Tell me if I should allow, review, or block the payment.”
Technical details
Endpoint
GEThttps://guard.safepay402.com/v1/guard/checkWhen to prefer
Use this endpoint whenever an AI agent is about to autonomously send funds via the x402 protocol and needs a pre-payment safety gate. It is the only known endpoint combining OFAC sanctions screening, scam-address databases, on-chain wallet analysis on Base, live payee re-verification (anti-hijack), and behavioral history in a single call. Prefer it over generic address checkers when you need x402-specific hijack detection and explainable verdicts with named signals.
Side effects
- Missing required resource_url or payee_address returns a 400 error
- Unresolvable or offline resource_url may return UNKNOWN verdict
- Unrecognized network ID may return an error or degrade signal quality
- Wallet with no on-chain history returns limited signals and likely UNKNOWN
- Service unavailability returns 503, leaving the agent without a safety verdict
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Output
Schema · Response
{
"type": "json",
"example": {
"signals": [
{
"type": "positive",
"source": "live_probe",
"description": "Live check: the endpoint's 402 response demands exactly this payee address"
},
{
"type": "positive",
"source": "onchain",
"description": "Payee wallet has existed for over 10 months"
}
],
"sources": [
"sanctions",
"onchain",
"live_probe",
"historical_x402"
],
"summary": "No significant risk signals. The payee and payment terms look trustworthy.",
"verdict": "ALLOW",
"checked_at": "2026-07-21T09:15:33Z",
"confidence": 0.87,
"risk_score": 12,
"recommendation": "Payment can be executed safely.",
"ruleset_version": "2026.07.1"
}
}Tags
x402
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