Webhook Tester API
Ping and validate your webhook URLs from the agent while you ship integrations, without juggling curl and a stopwatch.
Overview
Webhook Tester is a MCP server for the Ship phase that sends test HTTP requests to webhook URLs, measures latency, and helps validate responses.
What is this MCP server?
- Send HTTP requests to arbitrary webhook endpoints from MCP
- Measure response latency for timeout and SLA checks
- Validate status codes and response bodies against expectations
- Hosted SSE remote at webhook-tester.api.klymax402.com
- x402 micropayment model for metered API access
- Server schema version 2025-12-11
- Package version 1.1.0
- Transport type SSE on hosted remote URL
What problem does it solve?
You cannot trust a webhook handler until you have repeatedly hit the live URL and confirmed timing and payloads, which is tedious to do by hand from the terminal.
Who is it for?
Indie builders shipping Stripe, billing, or custom event webhooks who want agent-driven smoke tests without maintaining a local tester service.
Skip if: Teams that need full contract-test suites, load testing at scale, or entirely free self-hosted tooling with no x402 billing.
What do I get? / Deliverables
Your agent can regression-test webhook endpoints in conversation and catch bad responses before customers or payment providers do.
- Recorded test requests and responses for a webhook URL
- Latency measurements for timeout tuning
- Pass-or-fail validation notes on status and body
Recommended MCP Servers
Journey fit
How it compares
Focused webhook HTTP tester over MCP, not a general API client skill or hosted CI pipeline.
Common Questions / FAQ
Who is webhook-tester for?
Solo and indie developers who integrate third-party webhooks and want their AI coding agent to fire real requests and check responses quickly.
When should I use webhook-tester?
Use it while implementing callback handlers and again before launch whenever you change URL routing, auth, or payload parsing.
How do I add webhook-tester to my agent?
Register the remote MCP endpoint https://webhook-tester.api.klymax402.com/mcp as an SSE server in your client, then satisfy any x402 micropayment requirements the host documents.