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SignGate Agent Buyer Identity Preflight – Sumsub Payment Method Crypto Evidence
x402
SignGate Agent Buyer Identity Preflight – Sumsub Payment Method Crypto Evidence 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 2026-09-15).
Verifies KYC/AML risk level of a crypto wallet address against a Sumsub applicant identity before an AI agent executes an x402 micropayment 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 with the Base network identifier (eip155:8453), product name (sumsub-payment-method-crypto-evidence), and an assessment object containing a risk_score (numeric), risk_level (e.g. 'low'), and flags array listing any AML/KYC concerns found for the wallet-applicant pair.
Example use cases
Pre-purchase compliance gate for agent
“My agent is about to buy an x402 API — first check if Sumsub applicant 'agent-kyc-9f2a' with wallet 0x1A2B3C4D5E6F7A8B9C0D1E2F3A4B5C6D7E8F9A0B is low-risk and cleared to proceed.”
AML screening before dataset acquisition
“Before purchasing that sensitive financial dataset via x402, screen wallet 0xDeAdBeEf1234567890AbCdEf1234567890AbCdEf for Sumsub applicant 'ds-buyer-0042' and tell me the risk score and any flags.”
Automated agent wallet risk assessment
“Run a Sumsub crypto evidence preflight on applicant 'sandbox:test-user-001' and wallet 0xFeDcBa9876543210FeDcBa9876543210FeDcBa98 so I can decide whether to let my agent proceed with the x402 payment.”
Technical details
Endpoint
GEThttps://base-agent-preflight.bytoken2023.workers.dev/v1/x402/sumsub/payment-method-crypto-evidenceWhen to prefer
Use this endpoint when an AI agent operating under x402 payment governance needs to verify that the purchasing wallet and its associated Sumsub KYC identity are compliant before executing a crypto micropayment. Prefer this over generic wallet screening tools when the workflow is specifically x402-protocol-based and Sumsub is the identity provider, especially for Base network (eip155:8453) transactions where buyer role eligibility and AML risk must be confirmed programmatically before the agent spends funds.
Side effects
- Invalid wallet address format (not a valid 0x hex address) returns a validation error
- Unknown or non-existent Sumsub applicant_id returns a not-found or fixture error
- High risk score or flagged wallet results in a non-low risk_level in the assessment, blocking purchase
- Network or Cloudflare Worker timeout returns a 5xx error
- Missing required query parameters returns a 400 bad request
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Output
Schema · Response
{
"type": "json",
"example": {
"network": "eip155:8453",
"product": "sumsub-payment-method-crypto-evidence",
"assessment": {
"flags": [],
"risk_level": "low",
"risk_score": 0
}
}
}Tags
x402
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