This tool is no longer present in the server's latest manifest. Showing the last observed version (server version 1.28.0).

onyx_x402_spec_lookup

Inactive

Tool of onyx-paid-mcp

declared in 1.28.0

Quick-reference into the x402 v2 protocol spec. Look up an error string, HTTP status, header name, payload field, or feature keyword and get the relevant spec snippet plus a plain-English fix. Replaces 30 minutes of spec-grepping with a single call. Free tier — embedded knowledge, no network. (price: $0 USDC, tier: free)

Parameters schema

{
  "type": "object",
  "required": [
    "query"
  ],
  "properties": {
    "query": {
      "type": "string",
      "description": "What to look up: error string ('invalid_exact_evm_payload_authorization_valid_before'), header name ('PAYMENT-SIGNATURE'), status code ('402'), payload field ('nonce'), or feature keyword ('EIP-3009', 'CAIP-2', 'facilitator', 'JWT')."
    }
  }
}

What this tool wraps· 1 endpoint

min confidence0.70 0.50

Packagepypi: x402
declared dependency0.85

Parent server

onyx-paid-mcp

https://github.com/dimitrilaouanis-tech/onyx-mcp

2/7 registries

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