Webhook Tester API
Test webhook endpoints — send requests, measure latency, validate responses. x402 micropayment.
Open source Repository Open in the app JSON README (API)
About
Test webhook endpoints — send requests, measure latency, validate responses. x402 micropayment.
Details
- Kind
- MCP servers
- Topic
- Finance & crypto
- Publisher
- br0ski777
- Origin
- official
- Category
- ferramentas
- Transport
- sse
- Version
- 1.1.0
- Last push
- 2026-09-02T19:58:05Z
- Repository state
- ativo
- Language
- TypeScript
- License
- MIT
- Added
- 2026-08-29 03:01:44
- Updated
- 2026-08-29 03:01:44
- Origin id
io.github.Br0ski777/webhook-tester
README
# Webhook Tester API
[](https://webhook-tester.api.klymax402.com/mcp)
[](https://x402.org)
[](LICENSE)
Test 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.
Part of the [klymax402](https://klymax402.com) 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.):
```json
{
"mcpServers": {
"webhook-tester": {
"url": "https://webhook-tester.api.klymax402.com/mcp"
}
}
}
```
## Quickstart -- HTTP (x402)
```bash
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
```
Any 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.
## Tools
| Tool | Method | Path | Price | Description |
|---|---|---|---|---|
| `api_test_webhook` | POST | `/api/test` | $0.005 | Send a test request to a webhook URL and analyze the response |
### `api_test_webhook`
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.
**Parameters**
| Name | Type | Required | Description |
|---|---|---|---|
| `url` | string | yes | Webhook URL to test (must be https) |
| `method` | string | no | HTTP method: POST, PUT, PATCH, DELETE (default: POST) |
| `headers` | object | no | Custom headers as key-value pairs |
| `body` | object | no | JSON body to send |
| `timeout` | number | no | Timeout in seconds (default: 10, max: 30) |
Example response:
```json
{"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}
```
**When to use**: testing webhook integrations, debugging API callbacks, validating endpoint availability, and measuring webhook response times.
**Not for**: web scraping (use `web_scrape_to_markdown`), screenshot capture (use `capture_screenshot`), HTTP header security audit (use `network_analyze_headers`).
## Example agent prompts
- "Test a webhook endpoint by sending a request with custom headers, body, and method"
## Payment
- Protocol: [x402](https://x402.org) -- HTTP-native pay-per-call, no signup, no API key
- Network: Base L2 (`eip155:8453`)
- Asset: USDC
- Facilitator: Coinbase CDP (primary), PayAI (fallback)
- Also reachable via [ATXP](https://atxp.ai) (OAuth-wrapped x402, RFC 9728 protected-resource metadata)
## Part of klymax402
100 x402 micropayment APIs for AI agents -- one wallet, USDC on Base, zero signup.
- Catalog: https://klymax402.com/llms.txt
- Full API reference: https://klymax402.com/llms-full.txt
- Live stats: https://klymax402.com/stats
## License
MIT