# BlockJust Address Risk Check

> BlockJust Address Risk Check is a paid API for AI agents from api.blockjust.com, paid per call via x402, $0.002/call, status unknown (last checked 2026-09-15).

Returns sanctions, theft, mixing, and fraud risk level for a blockchain address in a single API call, surfacing the sending agent's identity for Agent Pay payment security.

## Facts

- Endpoint: GET https://api.blockjust.com/v1/address/risk-check
- Price: $0.002/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-15
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/blockjust-address-risk-check-6c611783
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_N9VVnxm0pogKdRgcPWGQs

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 blockjust-address-risk-check-6c611783
```

Example prompt: Before I accept this payment, can you run a risk check on the sending wallet 0xAbC123... on Base (chain ID 8453) and tell me if it's flagged for sanctions, theft, mixing, or fraud?

## When to prefer this

Use BlockJust when your agent needs to screen incoming crypto payments for compliance risk — specifically sanctions, theft, mixing, and fraud — before accepting funds in an Agent Pay or x402 payment flow. Prefer this over generic blockchain analytics when you need a single fast API call optimized for autonomous agent payment pipelines on Base and EVM-compatible chains.

## Known failure modes

- Invalid or malformed address returns an error response
- Unsupported chain ID results in a bad request error
- Address not yet indexed on the specified chain may return no risk data
- Rate limit exceeded returns a 429 response
- Missing required parameters (address or chain_id) returns a 400 error

## How this service works

One API call surfaces the sending agent's identity and the sanctions, theft, mixing, and fraud risk behind incoming funds. Built for Agent Pay.

## Output

A JSON object containing the queried address, chain ID, a request ID, an overall risk_level (e.g. 'low', 'medium', 'high'), the access_mode ('x402'), and a list of risk_reasons explaining any flags — such as sanctions exposure, stolen funds, mixing activity, or fraud signals.

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "address": "0x0000000000000000000000000000000000000000",
  "chain_id": "8453",
  "request_id": "req_example",
  "risk_level": "low",
  "access_mode": "x402",
  "risk_reasons": []
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/blockjust-address-risk-check-6c611783/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from api.blockjust.com](https://www.zero.xyz/host/api.blockjust.com/llms.txt)