# SignGate Crypto Transfer Compliance Bundle Preflight

> SignGate Crypto Transfer Compliance Bundle Preflight is a paid API for AI agents from base-agent-preflight.bytoken2023.workers.dev, paid per call via x402, $0.2/call, status unknown (last checked 2026-09-14).

Runs a Sumsub-powered compliance and risk assessment on a crypto transfer transaction and wallet before an AI agent proceeds with an x402 payment.

## Facts

- Endpoint: GET https://base-agent-preflight.bytoken2023.workers.dev/v1/x402/sumsub/crypto-transfer-compliance-bundle
- Price: $0.2/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-14
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/signgate-crypto-transfer-compliance-bundle-preflight-74d975cf
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_vg4Ng-eSkv804BqOsUTjA

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-crypto-transfer-compliance-bundle-preflight-74d975cf
```

Example prompt: Before my agent buys the Sumsub crypto-transfer-compliance-bundle on x402, run a preflight compliance check on wallet 0xAbC1234567890abcdef1234567890abcdef123456 for transaction ID txn-abc-987 on the eip155:8453 network to confirm the risk level is low.

## When to prefer this

Use this endpoint when an AI agent is about to execute an x402 payment and you need a lightweight, per-transaction risk and compliance preflight powered by Sumsub. It is specifically designed for the x402 protocol context where buyer identity, wallet provenance, and transfer sensitivity must be validated before a payment is made. Prefer this over generic AML tools when operating on Base (eip155:8453) with x402-gated APIs, datasets, or tools.

## Known failure modes

- Missing required query params (transaction_id or wallet) returns a 400 validation error
- Malformed wallet address (not matching 0x + 40 hex chars) rejected by schema validation
- Unknown or unsupported chain/asset string causes a processing error
- Sumsub upstream timeout or outage results in a 503 or delayed response
- Transaction ID not found in the compliance provider's records returns an empty or inconclusive assessment
- Payment of 0.2 USDC not fulfilled triggers x402 payment-required response before any compliance data is returned

## 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

A JSON object containing the blockchain network, product identifier, and an assessment block with risk_score (numeric), risk_level (e.g. 'low'), and any compliance flags raised against the wallet and transaction. May also include identity, activity, and provenance sub-objects for deeper review.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "$schema": "https://json-schema.org/draft/2020-12/schema",
 "required": [
  "input"
 ],
 "properties": {
  "input": {
   "type": "object",
   "required": [
    "type",
    "method"
   ],
   "properties": {
    "type": {
     "type": "string",
     "const": "http"
    },
    "method": {
     "enum": [
      "GET"
     ],
     "type": "string"
    },
    "queryParams": {
     "type": "object",
     "required": [
      "transaction_id",
      "wallet"
     ],
     "properties": {
      "asset": {
       "type": "string",
       "pattern": "^[A-Za-z0-9._:-]{2,32}$"
      },
      "chain": {
       "type": "string",
       "pattern": "^[A-Za-z0-9._:-]{2,64}$"
      },
      "wallet": {
       "type": "string",
       "pattern": "^0x[a-fA-F0-9]{40}$"
      },
      "transaction_id": {
       "type": "string",
       "pattern": "^[A-Za-z0-9._:-]{1,128}$"
      },
      "transfer_reference": {
       "type": "string",
       "pattern": "^[A-Za-z0-9._:-]{1,128}$"
      }
     }
    }
   },
   "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-crypto-transfer-compliance-bundle",
  "assessment": {
   "flags": [],
   "risk_level": "low",
   "risk_score": 0
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/signgate-crypto-transfer-compliance-bundle-preflight-74d975cf/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)