Server definition

Hash: sha256:de8b3cdfcac77e16af0297e91ff481bcb0f8e992005c9e0f63f4aba79b8194d8
What it is: What a remote MCP server returned when asked what it offers: 1 tools

The blob, as servednamed by its sha256

{
  "instructions": "Generates deterministic webhook HMAC-SHA256 fixtures and optionally verifies a supplied signature using a customer-owned TEST secret and payload. It is offline and never delivers HTTP requests or validates a live endpoint. Tool calls cost 0.03 USDC on Base. Initialization, tool discovery and unpaid price challenges are free. Send x402 v2 PAYMENT-SIGNATURE on the POST or params._meta['x402/payment']. Reuse the identical input and authorization when recovering a pending purchase; do not sign a fresh charge. Results are retained24hours. Generates fixtures from only the supplied TEST secret, payload, and timestamp inputs; it never sends HTTP requests or checks a live endpoint. github_sha256 follows GitHub’s HMAC-SHA256 header shape. timestamped_sha256 is a generic timestamp-bound test scheme and is not Stripe or any other vendor’s certified implementation. The timestamped scheme signs the exact UTF-8 bytes of timestamp + \".\" + payload and checks freshness against the supplied now value; the real wall clock is never read. Requests are bounded to 131072 serialized UTF-8 bytes, 8 nesting levels, 20000 JSON nodes, and 10000 items per array. Payloads are bounded to 65536 UTF-8 bytes; secrets are bounded to 1024 characters. This tool does not certify a provider integration, retrieve provider configuration, manage production credentials, or make a security determination about a verifier. Results at most 96 KiB; retry identical input and authorization within 24 hours to recover a purchase.",
  "tools": [
    {
      "description": "Generates deterministic webhook HMAC-SHA256 fixtures and optionally verifies a supplied signature using a customer-owned TEST secret and payload. It is offline and never delivers HTTP requests or validates a live endpoint. Price: 0.03 USDC per completed bounded job on Base.",
      "inputSchema": {
        "additionalProperties": false,
        "properties": {
          "mode": {
            "enum": [
              "github_sha256",
              "timestamped_sha256"
            ],
            "type": "string"
          },
          "now": {
            "description": "Required by timestamped_sha256: supplied comparison epoch seconds.",
            "pattern": "^[1-9][0-9]{0,11}$",
            "type": "string"
          },
          "payload": {
            "description": "Exact UTF-8 payload text, at most 65536 bytes; never parsed or reformatted.",
            "type": "string"
          },
          "supplied_signature": {
            "description": "Optional exact header value to verify; malformed values produce a negative verification result.",
            "maxLength": 256,
            "type": "string"
          },
          "test_secret": {
            "description": "Customer-owned TEST secret; never returned in output.",
            "maxLength": 1024,
            "minLength": 1,
            "type": "string"
          },
          "timestamp": {
            "description": "Required by timestamped_sha256: canonical positive epoch seconds.",
            "pattern": "^[1-9][0-9]{0,11}$",
            "type": "string"
          },
          "tolerance_seconds": {
            "default": 300,
            "maximum": 3600,
            "minimum": 0,
            "type": "integer"
          }
        },
        "required": [
          "mode",
          "test_secret",
          "payload"
        ],
        "type": "object"
      },
      "name": "webhook_signature_fixture_lab",
      "outputSchema": null
    }
  ]
}

Verify it yourself

curl -s https://api.teppi.xyz/v1/evidence/sha256:de8b3cdfcac77e16af0297e91ff481bcb0f8e992005c9e0f63f4aba79b8194d8 | sha256sum