# SignGate Agent Buyer Identity Preflight – Sumsub Case Management Evidence

> SignGate Agent Buyer Identity Preflight – Sumsub Case Management Evidence 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 case management evidence and risk assessment to verify whether an AI agent buyer is authorized to purchase a specific x402 API, dataset, or tool.

## Facts

- Endpoint: GET https://base-agent-preflight.bytoken2023.workers.dev/v1/x402/sumsub/case-management-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-agent-buyer-identity-preflight-sumsub-case-management-evidence-de93f0a1
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_-S2Enlnddoc-ujY-F1vCD

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-agent-buyer-identity-preflight-sumsub-case-management-evidence-de93f0a1
```

Example prompt: Before you purchase that x402 dataset on my behalf, run a SignGate preflight check using Sumsub case ID 'case-abc123' to make sure I'm authorized and the risk level is acceptable.

## When to prefer this

Choose this endpoint when an AI agent needs to perform a pre-purchase compliance and identity governance check specifically within the x402 payment ecosystem using Sumsub case data. It is ideal when the purchasing agent's buyer role, risk score, and policy approval status must be verified before committing to a microtransaction for a sensitive API, dataset, or tool. Prefer this over generic KYC lookups when you need x402-native purchase governance tied to Sumsub case management evidence.

## Known failure modes

- Missing or invalid case_id format returns a 400 validation error
- Unknown case_id not found in Sumsub returns a 404 not found response
- Sumsub backend unavailable causes a 503 or timeout
- Unauthorized caller (missing or invalid payment token) returns a 402 payment required
- Case in a non-terminal state may return incomplete assessment data

## 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 blockchain network identifier (e.g. eip155:8453), product name, risk score (0–100), risk level (e.g. 'low'), risk flags array, plus nested identity, activity, assessment, and provenance objects describing the buyer's compliance posture for the requested x402 product.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "$schema": "https://json-schema.org/draft/2020-12/schema",
 "required": [
  "input"
 ],
 "properties": {
  "input": {
   "type": "object",
   "required": [
    "type",
    "method"
   ],
   "properties": {
    "type": {
     "type": "string",
     "const": "http"
    },
    "method": {
     "enum": [
      "GET"
     ],
     "type": "string"
    },
    "queryParams": {
     "type": "object",
     "required": [
      "case_id"
     ],
     "properties": {
      "case_id": {
       "type": "string",
       "pattern": "^[A-Za-z0-9._:-]{1,128}$",
       "description": "Sumsub case id or sandbox fixture reference."
      },
      "reference_id": {
       "type": "string",
       "pattern": "^[A-Za-z0-9._:-]{1,128}$",
       "description": "Internal SignGate request, applicant, or transaction 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-case-management-evidence",
  "assessment": {
   "flags": [],
   "risk_level": "low",
   "risk_score": 0
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/signgate-agent-buyer-identity-preflight-sumsub-case-management-evidence-de93f0a1/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)