# Sumsub Watchlist AML Evidence via x402 Preflight

> Sumsub Watchlist AML Evidence via x402 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 AML watchlist screening evidence for a Sumsub applicant to assess risk level before an AI agent executes an x402 micropayment purchase.

## Facts

- Endpoint: GET https://base-agent-preflight.bytoken2023.workers.dev/v1/x402/sumsub/watchlist-aml-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/sumsub-watchlist-aml-evidence-via-x402-preflight-4665b2e4
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_j_sy81dl4nsHiFbrx5m56

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 sumsub-watchlist-aml-evidence-via-x402-preflight-4665b2e4
```

Example prompt: Before I proceed with this x402 API purchase, run an AML watchlist check on Sumsub applicant ID 'applicant-abc123' and tell me their risk level and any flags.

## When to prefer this

Use this endpoint when an AI agent needs to perform a Sumsub-backed AML watchlist check specifically within the x402 micropayment governance flow — i.e., when you want a preflight compliance signal before authorizing an agent to spend USDC on a product or dataset. Prefer this over generic identity endpoints when you already have a Sumsub applicant ID and need a structured risk assessment tied to a specific counterparty reference on the Base network.

## Known failure modes

- Invalid or missing applicant_id returns a 400 validation error
- Unknown applicant_id not found in Sumsub returns a 404 or empty result
- Sumsub backend unavailable causes a 502/503 timeout
- Malformed applicant_id pattern (not matching regex) rejected at schema validation
- Payment not completed (x402 flow incomplete) blocks the response with a 402

## 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 ('sumsub-watchlist-aml-evidence'), and an assessment object with a risk_level ('low'/'medium'/'high'), numeric risk_score, and an array of AML flags — along with identity, activity, and provenance sub-objects for full evidence context.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "$schema": "https://json-schema.org/draft/2020-12/schema",
 "required": [
  "input"
 ],
 "properties": {
  "input": {
   "type": "object",
   "required": [
    "type",
    "method"
   ],
   "properties": {
    "type": {
     "type": "string",
     "const": "http"
    },
    "method": {
     "enum": [
      "GET"
     ],
     "type": "string"
    },
    "queryParams": {
     "type": "object",
     "required": [
      "applicant_id"
     ],
     "properties": {
      "applicant_id": {
       "type": "string",
       "pattern": "^[A-Za-z0-9._:-]{1,128}$",
       "description": "Sumsub applicant id or sandbox fixture reference."
      },
      "counterparty_reference": {
       "type": "string",
       "pattern": "^[A-Za-z0-9._:-]{1,128}$",
       "description": "Merchant, buyer, VASP, or counterparty 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-watchlist-aml-evidence",
  "assessment": {
   "flags": [],
   "risk_level": "low",
   "risk_score": 0
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/sumsub-watchlist-aml-evidence-via-x402-preflight-4665b2e4/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)