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Webhook Tester API

br0ski777/webhook-tester-x402

Reach for this when you need to validate webhook integrations without spinning up your own infrastructure. It connects to a hosted endpoint at webhook-tester.api.klymax402.com and runs over SSE transport. You can fire test requests at webhook URLs, measure response latency, and validate payloads coming back. The x402 micropayment integration suggests it's metered usage, though the GitHub repo doesn't expose implementation details beyond TypeScript source. Useful for debugging third-party webhook configs or load testing callback handlers before you wire them into production systems.

tool
1
transport
SSE
last updated
May 16, 2026
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Tools

1 tools

Public tool metadata for what this MCP can expose to an agent.

api_test_webhookUse this when you need to test a webhook endpoint by sending a request with custom headers, body, and method. Returns full response data in JSON. Returns: 1. statusCode 2. responseBody (parsed JSON o5 params

Use this when you need to test a webhook endpoint by sending a request with custom headers, body, and method. Returns full response data in JSON. Returns: 1. statusCode 2. responseBody (parsed JSON o

Parameters* required
bodyobject
JSON body to send
headersobject
Custom headers as key-value pairs
methodstring
HTTP method: POST, PUT, PATCH, DELETE (default: POST)
timeoutnumber
Timeout in seconds (default: 10, max: 30)
urlstring
Webhook URL to test (must be https)

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Readme

Webhook Tester API

MCP Server x402 License: MIT

Test webhook endpoints -- send POST/PUT/PATCH/DELETE with custom headers and payloads. Measure latency and TLS. Pay-per-call via x402 (USDC on Base L2) -- no API key, no signup, no rate-limit wall.

Part of the klymax402 marketplace -- 100 x402 micropayment APIs for AI agents, one wallet, USDC on Base.

Quickstart -- MCP

Add to your MCP client config (Claude Desktop, Cursor, ElizaOS, etc.):

{
  "mcpServers": {
    "webhook-tester": {
      "url": "https://webhook-tester.api.klymax402.com/mcp"
    }
  }
}

Quickstart -- HTTP (x402)

curl -X POST "https://webhook-tester.api.klymax402.com/api/test" \
  -H "Content-Type: application/json" \
  -d '{"url":"https://example.com"}'
# -> 402 Payment Required, with an x402 payment challenge in the response body

View the full README on GitHub

Details

Repository
github.com/br0ski777/webhook-tester-x402
Website
github.com/Br0ski777/webhook-tester-x402
Category
Automation & Workflows
Transport
SSE
Registry
MCP registry, active

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