api.youraitools.co

Live 402 challenge

Captured by the enrichment pass, not read just now. Prices can change — always read the 402 the endpoint answers with.

{
  "error": "X-PAYMENT header is required",
  "accepts": [
    {
      "asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
      "extra": {
        "name": "USD Coin",
        "version": "2"
      },
      "payTo": "0x3c1A1E01e790Cd326495631B3b38Bd7068F08d6F",
      "scheme": "exact",
      "network": "base",
      "mimeType": "application/json",
      "resource": "https://api.youraitools.co/signcheck/v1/lite",
      "description": "Offline pre-sign check (no RPC, fast): decodes a transaction, EIP-712 typed data (Permit, Permit2, EIP-3009), an EIP-7702 authorization or an x402 402 + payment payload and returns SAFE/CAUTION/DANGER, every risk flag with its reason, decoded args, counterparties, x402 payment-vs-402 match and OFAC SDN screening. Use /v1/check for on-chain facts and simulation.",
      "outputSchema": {
        "input": {
          "type": "http",
          "method": "POST",
          "bodyType": "json",
          "bodyFields": {
            "tx": {
              "type": "object",
              "description": "Transaction to send: {\"to\":\"0x…\",\"data\":\"0x…\",\"value\":\"0\",\"from\":\"0x…\"} (from enables simulation)"
            },
            "chain": {
              "type": "string",
              "description": "base (default), ethereum, base-sepolia or a chain id"
            },
            "typed_data": {
              "type": "object",
              "description": "EIP-712 request {domain, types, primaryType, message} as passed to eth_signTypedData_v4"
            },
            "authorization": {
              "type": "object",
              "description": "EIP-7702 authorization {address (delegate contract), chainId, nonce}"
            },
            "payment_payload": {
              "type": [
                "object",
                "string"
              ],
              "description": "x402 payment you are about to send: PAYMENT-SIGNATURE / X-PAYMENT (base64) or JSON"
            },
            "payment_required": {
              "type": [
                "object",
                "string"
              ],
              "description": "x402 402 terms: the PAYMENT-REQUIRED header (base64) or JSON {accepts:[…]}"
            }
          },
          "discoverable": true
        },
        "output": {
          "kind": "transaction",
          "tier": "full",
          "chain": {
            "id": 8453,
            "name": "Base"
          },
          "flags": [
            {
              "code": "SPENDER_IS_EOA",
              "message": "The token allowance goes to 0x3c1A…8d6F, a plain wallet (no contract code). Legitimate apps approve contracts; approvals to wallets are how drainer kits steal funds.",
              "severity": "critical"
            },
            {
              "code": "UNLIMITED_APPROVAL",
              "message": "Grants an UNLIMITED allowance to 0x3c1A…8d6F.",
              "severity": "medium"
            }
          ],
          "action": "erc20_approve",
          "engine": "signcheck-0.1",
          "onchain": {
            "block": 52942270,
            "chain": "Base",
            "tokens": [
              {
                "name": "USD Coin",
                "symbol": "USDC",
                "address": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
                "decimals": 6
              }
            ],
            "available": true,
            "simulation": {
              "success": true
            }
          },
          "summary": "Approve 0x3c1A…8d6F to spend UNLIMITED USDC from your wallet",
          "verdict": "DANGER",
          "sanctions": {
            "list": "US Treasury OFAC Specially Designated Nationals (SDN) list",
            "matches": 0,
            "list_date": "2026-10-21",
            "evm_addresses": 124
          },
          "risk_score": 75,
          "counterparties": [
            {
              "type": "eoa",
              "label": null,
              "roles": [
                "spender"
              ],
              "address": "0x3c1A1E01e790Cd326495631B3b38Bd7068F08d6F"
            }
          ]
        }
      },
      "maxAmountRequired": "5000",
      "maxTimeoutSeconds": 120
    }
  ],
  "x402Version": 1
}

Accepts

The payment requirements as published to the catalog. Read the live 402 before paying — a price here is a claim, not a quote.

[
  {
    "asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
    "extra": {
      "name": "USD Coin",
      "version": "2"
    },
    "payTo": "0x3c1A1E01e790Cd326495631B3b38Bd7068F08d6F",
    "scheme": "exact",
    "network": "eip155:8453",
    "mimeType": "application/json",
    "resource": "https://api.youraitools.co/signcheck/v1/lite",
    "description": "",
    "maxAmountRequired": "5000",
    "maxTimeoutSeconds": 120
  }
]

Provenance

Seen in the source catalog

2026-10-22 13:13Z

Last indexed by Roundhouse

2026-10-23 08:46Z

Last enriched (probe, favicon, geo)

2026-10-22 20:17Z

x402 version

1

Max timeout

120s

Liveness probe

HTTP 402