{
  "markdown": "# Webhook Tester API\n\n[![MCP Server](https://img.shields.io/badge/MCP-server-blue)](https://webhook-tester.api.klymax402.com/mcp)\n[![x402](https://img.shields.io/badge/payments-x402-6E56CF)](https://x402.org)\n[![License: MIT](https://img.shields.io/badge/license-MIT-green)](LICENSE)\n\nTest webhook endpoints -- send POST/PUT/PATCH/DELETE with custom headers and payloads. Measure latency and TLS. Pay-per-call via [x402](https://x402.org) (USDC on Base L2) -- no API key, no signup, no rate-limit wall.\n\nPart of the [klymax402](https://klymax402.com) marketplace -- 100 x402 micropayment APIs for AI agents, one wallet, USDC on Base.\n\n## Quickstart -- MCP\n\nAdd to your MCP client config (Claude Desktop, Cursor, ElizaOS, etc.):\n\n```json\n{\n  \"mcpServers\": {\n    \"webhook-tester\": {\n      \"url\": \"https://webhook-tester.api.klymax402.com/mcp\"\n    }\n  }\n}\n```\n\n## Quickstart -- HTTP (x402)\n\n```bash\ncurl -X POST \"https://webhook-tester.api.klymax402.com/api/test\" \\\n  -H \"Content-Type: application/json\" \\\n  -d '{\"url\":\"https://example.com\"}'\n# -> 402 Payment Required, with an x402 payment challenge in the response body\n```\n\nAny x402-aware client ([`@x402/fetch`](https://www.npmjs.com/package/@x402/fetch), [`x402-agent-tools`](https://www.npmjs.com/package/x402-agent-tools), ATXP) handles the 402 -> sign -> retry cycle automatically.\n\n## Tools\n\n| Tool | Method | Path | Price | Description |\n|---|---|---|---|---|\n| `api_test_webhook` | POST | `/api/test` | $0.005 | Send a test request to a webhook URL and analyze the response |\n\n### `api_test_webhook`\n\nUse 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.\n\n**Parameters**\n\n| Name | Type | Required | Description |\n|---|---|---|---|\n| `url` | string | yes | Webhook URL to test (must be https) |\n| `method` | string | no | HTTP method: POST, PUT, PATCH, DELETE (default: POST) |\n| `headers` | object | no | Custom headers as key-value pairs |\n| `body` | object | no | JSON body to send |\n| `timeout` | number | no | Timeout in seconds (default: 10, max: 30) |\n\nExample response:\n\n```json\n{\"url\":\"https://hooks.example.com/callback\",\"method\":\"POST\",\"statusCode\":200,\"responseBody\":{\"received\":true},\"latency\":142,\"tlsInfo\":{\"protocol\":\"TLSv1.3\",\"cipher\":\"AES-256-GCM\"},\"requestSize\":256,\"responseSize\":48}\n```\n\n**When to use**: testing webhook integrations, debugging API callbacks, validating endpoint availability, and measuring webhook response times.\n\n**Not for**: web scraping (use `web_scrape_to_markdown`), screenshot capture (use `capture_screenshot`), HTTP header security audit (use `network_analyze_headers`).\n\n## Example agent prompts\n\n- \"Test a webhook endpoint by sending a request with custom headers, body, and method\"\n\n## Payment\n\n- Protocol: [x402](https://x402.org) -- HTTP-native pay-per-call, no signup, no API key\n- Network: Base L2 (`eip155:8453`)\n- Asset: USDC\n- Facilitator: Coinbase CDP (primary), PayAI (fallback)\n- Also reachable via [ATXP](https://atxp.ai) (OAuth-wrapped x402, RFC 9728 protected-resource metadata)\n\n## Part of klymax402\n\n100 x402 micropayment APIs for AI agents -- one wallet, USDC on Base, zero signup.\n\n- Catalog: https://klymax402.com/llms.txt\n- Full API reference: https://klymax402.com/llms-full.txt\n- Live stats: https://klymax402.com/stats\n\n## License\n\nMIT\n",
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  "repo_slug": "br0ski777/webhook-tester-x402",
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  "api": "https://agentalog.com/api/listings/mcp_io_github_br0ski777_webhook_tester_5416d16c/readme"
}