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SignGate Sumsub KYT Evidence Lookup
x402
SignGate Sumsub KYT Evidence Lookup 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).
Retrieves Sumsub Know-Your-Transaction (KYT) evidence and risk assessment for a given transaction ID before an AI agent proceeds with 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 containing the network (e.g. eip155:8453), product identifier, and an assessment object with risk_level (e.g. 'low'), risk_score (numeric), flags array, plus optional activity, identity, and provenance sub-objects for the queried transaction.
Example use cases
Preflight before buying x402 dataset
“Before my agent buys that x402 dataset, check Sumsub KYT evidence for transaction ID 'sumsub-tx-00987' on eip155:8453 and tell me the risk score and any flags.”
Compliance screen for agent micropayment
“Run a KYT risk check on transaction 'kyt-ref-443322' using the Sumsub evidence endpoint — I need to know if the risk level is low before approving the USDC payment on Base.”
Audit trail for past x402 purchase
“Pull the Sumsub KYT evidence for transaction ID 'archive-tx-20240601' on Base so I can review the activity, identity, and provenance details for our compliance records.”
Technical details
Endpoint
GEThttps://base-agent-preflight.bytoken2023.workers.dev/v1/x402/sumsub/kyt-evidenceWhen to prefer
Use this endpoint when an AI agent needs to perform a compliance preflight check on a specific Sumsub transaction ID before executing an x402 micropayment on the Base network. Prefer it over generic blockchain analytics when you specifically have a Sumsub transaction reference and need KYT evidence with structured risk scoring and flags. It is especially suited for agentic purchase governance workflows where policy requires low risk_level confirmation before proceeding.
Side effects
- Missing or invalid transaction_id returns a 400 or validation error
- Unknown transaction_id that Sumsub has no record of may return empty or null assessment
- Malformed asset or chain identifiers (not matching pattern ^[A-Za-z0-9._:-]{2,32}$) cause schema validation failure
- Service unavailable on the Cloudflare Workers edge returns 5xx
- Payment not made (x402 gate) returns 402 Payment Required before any data is served
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Output
Schema · Response
{
"type": "json",
"example": {
"network": "eip155:8453",
"product": "sumsub-kyt-evidence",
"assessment": {
"flags": [],
"risk_level": "low",
"risk_score": 0
}
}
}Tags
x402
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