Security · x402 · early usage

Check a counterparty before paying: OFAC SDN, phishing and drainer feeds, a live watch…

Check a counterparty before paying: OFAC SDN, phishing and drainer feeds, a live watch of drainer infrastructure, transaction simulation and injected-instruction analysis. Returns a score and a signed ES256 attestation.

by x402check.xyz · discovered, not yet claimed by its owner · updated 2026-10-12

30d calls17

30d payers4

MethodPOST

Outputjson

Mirrored from Coinbase's public x402 Bazaar. The description is the provider's own text and has not been reviewed here; the payment requirements are copied as published.

What it does

Tags: security · risk-check · sanctions · phishing · wallets · bazaar

Call contract

Method: POST
Input: json
Output: json
Last paid call: 2026-10-12

Input example from Bazaar metadata

{
  "chain": "base",
  "context": "Permit2 signature: unlimited USDC allowance to this spender",
  "domain": "https://app.example-dapp.org",
  "interaction": {
    "type": "permit_signature",
    "unlimited": true
  },
  "wallet": "0x7a3e8f0c2b1d4e5f6a7b8c9d0e1f2a3b4c5d6e7f"
}

Output example

{
  "categories": [
    "approval_to_eoa",
    "unlimited_approval",
    "new_address"
  ],
  "checked": true,
  "checked_at": "2026-09-30T12:00:00.000Z",
  "evidence": {
    "onchain": {
      "activity": "none",
      "is_contract": false
    },
    "sanctions": {
      "list": "ofac-sdn",
      "status": "not_listed"
    }
  },
  "expires_at": "2026-09-30T13:00:00.000Z",
  "jws": "eyJhbGciOiJFUzI1NiIsImtpZCI6Impldi1hdHRlc3QtdjEiLCJ0eXAiOiJyaXNrLWNoZWNrK2p3dCJ9…",
  "provider": "did:web:x402check.xyz",
  "score": 40,
  "tier": "high"
}

Use with an agent

Discover. Agents find this listing with GET https://bazaar.saylorinnovations.com/discovery/search?query=…, the MCP tool search_resources, or /discovery/resources.
Inspect. Fetch /resources/35264.json for the price and payment options.
Pay. Call GET https://x402check.xyz/v1/risk-check. The provider answers 402 with its payment requirements. An x402 client signs one of the options below and retries with PAYMENT-SIGNATURE.
Execute. The provider returns 200 with the data. Agent Bazaar is not in the request path and never sees your payment.

For humans

You don't need an account or an API key; you need a wallet holding a small amount of USDC on Base, Polygon, Arbitrum One, Avalanche, eip155:143, eip155:1329, Solana, and an x402-capable client (see the examples below). Call the endpoint unpaid first to see exactly what it asks for.

Pricing & payment

Price: $0.0035 / request
Protocol: x402 v2
Auth: No account or API key. Pay per request.
Networks: Base, Polygon, Arbitrum One, Avalanche, eip155:143, eip155:1329, Solana
Demand: 17 calls · 4 unique payers in 30d (public x402 Bazaar data)

x402 payment requirements

Scheme	Network	Asset	Amount	Pay to	Timeout
exact	Base eip155:8453	USDC	$0.0035	0xbF88b1F49B5e8Ec386289341c4a5ee00bB0E0178	300s
exact	Polygon eip155:137	USDC	$0.007	0xbF88b1F49B5e8Ec386289341c4a5ee00bB0E0178	300s
exact	Arbitrum One eip155:42161	USDC	$0.009	0xbF88b1F49B5e8Ec386289341c4a5ee00bB0E0178	300s
exact	Avalanche eip155:43114	0xB97EF9Ef8734C71904D8002F8b6Bc66Dd9c48a6E	1000	0xbF88b1F49B5e8Ec386289341c4a5ee00bB0E0178	300s
exact	eip155:143 eip155:143	0x754704Bc059F8C67012fEd69BC8A327a5aafb603	1000	0xbF88b1F49B5e8Ec386289341c4a5ee00bB0E0178	300s
exact	eip155:1329 eip155:1329	0xe15fC38F6D8c56aF07bbCBe3BAf5708A2Bf42392	2000	0xbF88b1F49B5e8Ec386289341c4a5ee00bB0E0178	300s
exact	Solana solana:5eykt4UsFv8P8NJdTREpY1vzqKqZKvdp	USDC	$0.002	Bofhoe2ye2adNQwZJtLepeKrBZq8CtHzRwPJXgWDH69X	300s

accepts[] (raw JSON)

[
  {
    "scheme": "exact",
    "network": "eip155:8453",
    "payTo": "0xbF88b1F49B5e8Ec386289341c4a5ee00bB0E0178",
    "asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
    "amount": "3500",
    "amountUsd": 0.0035,
    "maxTimeoutSeconds": 300
  },
  {
    "scheme": "exact",
    "network": "eip155:137",
    "payTo": "0xbF88b1F49B5e8Ec386289341c4a5ee00bB0E0178",
    "asset": "0x3c499c542cEF5E3811e1192ce70d8cC03d5c3359",
    "amount": "7000",
    "amountUsd": 0.007,
    "maxTimeoutSeconds": 300
  },
  {
    "scheme": "exact",
    "network": "eip155:42161",
    "payTo": "0xbF88b1F49B5e8Ec386289341c4a5ee00bB0E0178",
    "asset": "0xaf88d065e77c8cC2239327C5EDb3A432268e5831",
    "amount": "9000",
    "amountUsd": 0.009,
    "maxTimeoutSeconds": 300
  },
  {
    "scheme": "exact",
    "network": "eip155:43114",
    "payTo": "0xbF88b1F49B5e8Ec386289341c4a5ee00bB0E0178",
    "asset": "0xB97EF9Ef8734C71904D8002F8b6Bc66Dd9c48a6E",
    "amount": "1000",
    "maxTimeoutSeconds": 300
  },
  {
    "scheme": "exact",
    "network": "eip155:143",
    "payTo": "0xbF88b1F49B5e8Ec386289341c4a5ee00bB0E0178",
    "asset": "0x754704Bc059F8C67012fEd69BC8A327a5aafb603",
    "amount": "1000",
    "maxTimeoutSeconds": 300
  },
  {
    "scheme": "exact",
    "network": "eip155:1329",
    "payTo": "0xbF88b1F49B5e8Ec386289341c4a5ee00bB0E0178",
    "asset": "0xe15fC38F6D8c56aF07bbCBe3BAf5708A2Bf42392",
    "amount": "2000",
    "maxTimeoutSeconds": 300
  },
  {
    "scheme": "exact",
    "network": "solana:5eykt4UsFv8P8NJdTREpY1vzqKqZKvdp",
    "payTo": "Bofhoe2ye2adNQwZJtLepeKrBZq8CtHzRwPJXgWDH69X",
    "asset": "EPjFWdd5AufqSSqeM2qN1xzybapC8G4wEGGkZwyTDt1v",
    "amount": "2000",
    "amountUsd": 0.002,
    "maxTimeoutSeconds": 300
  }
]

Schemas

Output schema (JSON Schema)

{
  "properties": {
    "example": {
      "type": "object"
    },
    "type": {
      "type": "string"
    }
  },
  "required": [
    "type"
  ],
  "type": "object"
}

Example shape — generated from the schema, not a captured live response

{
  "example": {},
  "type": "string"
}

Examples

curl

curl "https://x402check.xyz/v1/risk-check"
# -> 402 Payment Required, accepts[] lists how to pay
# retry with a PAYMENT-SIGNATURE (or PAYMENT header) once paid

JavaScript

const res = await fetch("https://x402check.xyz/v1/risk-check");
if (res.status === 402) {
  const { accepts } = await res.json();
  // pay one of accepts[] via an x402 client, then retry with the payment header
}

Python

import httpx
res = httpx.get("https://x402check.xyz/v1/risk-check")
if res.status_code == 402:
    accepts = res.json()["accepts"]
    # pay one of accepts[] via an x402 client, then retry with the payment header

Details

Provider: x402check.xyz
Endpoint: https://x402check.xyz/v1/risk-check
Machine-readable: /resources/35264.json