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402Sentinel x402 Counterparty Risk Gate
x402
402Sentinel x402 Counterparty Risk Gate is a paid API for AI agents from 402sentinel.com, paid per call via x402, $0.002/call, status unknown (last checked 2026-09-15).
Scores an x402 payment counterparty address 0-100 for risk and returns an allow/review/block decision based on on-chain settlement behaviour before you pay
Price / call$0.002
Success—
StatusUnknown
How this service works
Same input as /api/assess, but returns a trimmed action-oriented view: the allow/limit/deny decision plus a wallet-ready spending policy (max_payment_usdc per-counterparty cap, daily_cap_usdc, add_to_denylist, require_human_approval) an agent can apply directly to its wallet limits.
Output
Returns a 0-100 risk score and a categorical decision (allow, review, or block) for the queried counterparty address, derived from on-chain signals including address age, payer diversity, facilitator awareness, and settlement maturity on Base.
Example use cases
Example prompt
“Before I pay that x402 endpoint at address 0xAbC123..., run it through 402Sentinel and tell me its risk score and whether I should allow, review, or block the payment.”
Technical details
Endpoint
POSThttps://402sentinel.com/api/policyWhen to prefer
Use this endpoint when your AI agent is about to make an x402 pay-per-call payment and needs a pre-payment counterparty risk check based purely on on-chain settlement behaviour. Prefer this over generic blockchain analytics tools when the specific concern is x402 protocol counterparty trust and facilitator-aware risk scoring on Base.
Side effects
- Unknown or brand-new address with no on-chain history may return low-confidence score
- Invalid or malformed address input returns validation error
- Address not on Base network may be unsupported
- x402 payment for the API call itself fails if caller wallet has insufficient USDC
- Rate limiting or service unavailability returns 5xx error
Input
{
"policy": {
"min_confidence": 0.5,
"max_payment_usdc": 50,
"review_ceiling_usdc": 5
},
"target": {
"payto_address": "0x6a5e7d954f49712abf3f873f037ec845b7b8c666"
},
"payment_context": {
"asset": "USDC",
"amount": 10
}
}Schema · Request body
| Field | Type | Description |
|---|---|---|
| policy | object | Optional caller thresholds shaping the returned spending policy. |
| target | object | The x402 seller to score. |
| payment_context | object |
Output
{
"as_of": "2026-06-12T04:56:30+00:00",
"coverage": {
"age_days": 114,
"is_contract": false,
"real_payers": 118,
"data_sources": [
"base_blockscout",
"outcome_flywheel",
"x402_registry"
],
"distinct_payers": 118,
"outcome_reports": 0,
"dimensions_scored": [
"identity_provenance",
"sybil_flow",
"settlement_maturity",
"sanctions"
],
"settlements_observed": 150,
"facilitators_excluded": 0
},
"decision": "allow",
"confidence": 0.85,
"risk_score": 18,
"assessment_id": "ca_895f1dee66caadd1be",
"recommended_policy": {
"model": "402sentinel/policy-v0",
"action": "allow",
"rationale": "Low risk — allow up to 40.94 USDC per payment (204.7 USDC/day).",
"daily_cap_usdc": 204.7,
"add_to_denylist": false,
"max_payment_usdc": 40.94,
"require_human_approval": false,
"proposed_amount_within_cap": true
}
}Tags
x402
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