# SignGate Sumsub Travel Rule Evidence Preflight

> SignGate Sumsub Travel Rule Evidence Preflight is a paid API for AI agents from base-agent-preflight.bytoken2023.workers.dev, paid per call via x402, $0.05/call, status unknown (last checked 2026-09-14).

Retrieves Sumsub-based Travel Rule compliance evidence and risk assessment for a crypto transfer reference before an AI agent executes an x402 payment.

## Facts

- Endpoint: GET https://base-agent-preflight.bytoken2023.workers.dev/v1/x402/sumsub/travel-rule-evidence
- Price: $0.05/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-14
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/signgate-sumsub-travel-rule-evidence-preflight-6ea390f4
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_As2WcRkOR7MH7Z3olz8kY

Status and success rate cover calls made through Zero and Zero's own probes. Third-party monitors may report differently.

## How to call it through Zero

Zero handles the 402 payment challenge and records the run. With the Zero CLI installed (`npm i -g @zeroxyz/cli`):

```sh
zero fetch --capability signgate-sumsub-travel-rule-evidence-preflight-6ea390f4
```

Example prompt: Before we purchase this x402 API tool, run a Sumsub Travel Rule evidence check on transfer reference TXN-20240601-ABC123 — originator is agent:buyer-001 and beneficiary is api:provider-xyz — and tell me the risk score and whether there are any compliance flags.

## When to prefer this

Choose this endpoint when an AI agent needs to perform a Travel Rule compliance preflight specifically backed by Sumsub identity verification on the Base (eip155:8453) network before executing an x402 micropayment. Prefer it over generic KYC checks when you need structured Sumsub evidence with a risk score and provenance that can feed into an automated purchase governance workflow.

## Known failure modes

- Missing transfer_reference parameter returns a 400 validation error
- Unknown or unresolvable transfer reference returns empty or not-found response
- Malformed originator/beneficiary identifiers (not matching pattern ^[A-Za-z0-9._:-]{1,128}$) return 422
- Network or Sumsub backend unavailability may return 503
- Expired or already-used payment reference may return 402 or 403
- High-risk transfers may return populated flags array requiring manual review

## 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 for Base), product identifier (sumsub-travel-rule-evidence), and an assessment block with risk_level (e.g. 'low'), risk_score (numeric), flags array, plus identity, activity, and provenance objects describing the originator and beneficiary.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "$schema": "https://json-schema.org/draft/2020-12/schema",
 "required": [
  "input"
 ],
 "properties": {
  "input": {
   "type": "object",
   "required": [
    "type",
    "method"
   ],
   "properties": {
    "type": {
     "type": "string",
     "const": "http"
    },
    "method": {
     "enum": [
      "GET"
     ],
     "type": "string"
    },
    "queryParams": {
     "type": "object",
     "required": [
      "transfer_reference"
     ],
     "properties": {
      "originator": {
       "type": "string",
       "pattern": "^[A-Za-z0-9._:-]{1,128}$"
      },
      "beneficiary": {
       "type": "string",
       "pattern": "^[A-Za-z0-9._:-]{1,128}$"
      },
      "transfer_reference": {
       "type": "string",
       "pattern": "^[A-Za-z0-9._:-]{1,128}$",
       "description": "Crypto transfer, VASP, or SignGate payment reference."
      }
     }
    }
   },
   "additionalProperties": false
  },
  "output": {
   "type": "object",
   "required": [
    "type"
   ],
   "properties": {
    "type": {
     "type": "string"
    },
    "example": {
     "type": "object",
     "properties": {
      "network": {
       "type": "string"
      },
      "product": {
       "type": "string"
      },
      "activity": {
       "type": "object"
      },
      "identity": {
       "type": "object"
      },
      "assessment": {
       "type": "object"
      },
      "provenance": {
       "type": "object"
      }
     }
    }
   }
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "network": "eip155:8453",
  "product": "sumsub-travel-rule-evidence",
  "assessment": {
   "flags": [],
   "risk_level": "low",
   "risk_score": 0
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/signgate-sumsub-travel-rule-evidence-preflight-6ea390f4/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from base-agent-preflight.bytoken2023.workers.dev](https://www.zero.xyz/host/base-agent-preflight.bytoken2023.workers.dev/llms.txt)