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SafePay402 — x402 Payment Guardian
x402
SafePay402 — x402 Payment Guardian is a paid API for AI agents from guard.46-225-25-237.sslip.io, paid per call via x402, $0.02/call, status unknown (last checked 2026-09-14).
Performs pre-payment security checks on x402 payment targets and returns an explainable ALLOW/REVIEW/BLOCK/UNKNOWN verdict with risk signals before an AI agent sends funds.
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
A JSON object containing: a verdict (ALLOW, REVIEW, BLOCK, or UNKNOWN), a numeric risk_score (0-100), a confidence value (0-1), an array of risk signals each tagged with type (positive/negative) and source (sanctions, onchain, live_probe, historical_x402), a human-readable summary and recommendation, the sources checked, the ruleset_version used, and a checked_at timestamp.
Example use cases
Screen unknown API vendor before paying
“I'm about to pay 0.05 USDC to wallet address 0xDeAdBeEf1234567890abcdef1234567890AbCdEf on Base for access to https://data.somedomain.io/v1/prices — can you run a SafePay402 check first and tell me whether the verdict is ALLOW, REVIEW, or BLOCK, and what the main risk signals are?”
Enforce agent policy on crypto micropayments
“My agent policy only allows payments on eip155:8453 up to 0.10 USDC in USDC. Before the agent pays 0.02 USDC to 0xAbCd1234AbCd1234AbCd1234AbCd1234AbCd1234 for https://guard.someapi.io/v1/feed, check it against SafePay402 and block it if the verdict isn't ALLOW.”
Audit a suspicious 402 redirect
“I got redirected to an x402 payment page asking me to pay 0.10 USDC to 0xBadActor0000000000000000000000000000cafe on network eip155:8453 for https://sketchy-api.xyz/premium — please run a SafePay402 risk check on that payee and URL and tell me the risk score, verdict, and recommendation before I approve anything.”
Technical details
Endpoint
GEThttps://guard.46-225-25-237.sslip.io/v1/guard/checkWhen to prefer
Use this endpoint when an AI agent is operating autonomously with a crypto wallet and needs a pre-flight safety check before executing any x402 micropayment — especially when the payee address or resource URL is unfamiliar, user-supplied, or discovered dynamically. It is the right choice when explainability (human-readable signals and verdicts) and policy enforcement (allowed networks, assets, max amounts) matter more than raw speed. Prefer it over skipping verification entirely whenever autonomous fund transfers are involved.
Side effects
- Missing required query parameters (resource_url or payee_address) returns a 400 error
- Unpaid request returns HTTP 402 with x402 payment requirements — the caller must pay 0.02 USDC before receiving a verdict
- Invalid EVM address format for payee_address causes a validation error
- Unreachable resource_url may result in a UNKNOWN verdict with reduced confidence
- Rate limiting or upstream sanctions/onchain data unavailability may delay or degrade response quality
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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