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SignGate x402 Sumsub Proof-of-Address Evidence Preflight
x402
SignGate x402 Sumsub Proof-of-Address Evidence Preflight is a paid API for AI agents from base-agent-preflight.bytoken2023.workers.dev, paid per call via x402, $0.03/call, status unknown (last checked 2026-09-14).
Validates a Sumsub applicant's proof-of-address evidence and computes a risk score before an AI agent proceeds with an x402-gated purchase.
Price / call$0.03
Success—
StatusUnknown
How this service works
Machine-payable service intelligence for discovering, verifying, and monitoring identity, risk, authorization, execution-preflight, and evidence APIs before autonomous agents spend.
Output
Returns a JSON object containing the EIP-155 network identifier (e.g. eip155:8453 for Base), the product name ('sumsub-poa-evidence'), and an assessment object with a risk_level string (e.g. 'low'), a numeric risk_score (0–100), and a flags array listing any compliance issues detected against the applicant's proof-of-address data.
Example use cases
Pre-purchase compliance check for agent
“My AI agent is about to buy an x402 API access using applicant ID 'agt-00123xyz' — can you run the Sumsub proof-of-address preflight for jurisdiction DE and tell me whether the risk level is low enough to proceed?”
Jurisdiction eligibility screening
“Check if applicant 'sandbox:fixture-poa-pass' is cleared to make purchases in the GB jurisdiction according to the proof-of-address evidence — I need the risk score and any flags before we proceed.”
Blocked buyer investigation
“Our agent got flagged on a purchase attempt — can you pull the Sumsub POA evidence assessment for applicant ID 'usr-flagged-99z' under jurisdiction CA so I can see what risk level and flags are blocking it?”
Technical details
Endpoint
GEThttps://base-agent-preflight.bytoken2023.workers.dev/v1/x402/sumsub/poa-evidenceWhen to prefer
Use this endpoint when an AI agent needs to perform a lightweight, per-call compliance preflight specifically against Sumsub proof-of-address evidence on the Base network (eip155:8453) before committing to an x402 micropayment. Prefer it over general KYC endpoints when the product category is 'sumsub-poa-evidence' and you need a structured risk score and flags rather than a binary pass/fail.
Side effects
- Missing or malformed applicant_id returns a validation error
- Invalid jurisdiction code (not ISO-3166 two-letter uppercase) causes a 400 error
- Unknown or unregistered Sumsub applicant ID returns not-found or empty assessment
- Sumsub backend unavailability causes a 502/503 upstream error
- Payment not included or invalid x402 payment header returns 402 Payment Required
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Output
Schema · Response
{
"type": "json",
"example": {
"network": "eip155:8453",
"product": "sumsub-poa-evidence",
"assessment": {
"flags": [],
"risk_level": "low",
"risk_score": 0
}
}
}Tags
x402
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