API Webhook Latency — Measured Response Times of Popular Webhook Endpoints
Measured TTFB response times for 15+ webhook testing endpoints and echo services. Includes reliability scores, feature comparisons, rate limits, and free tier details for developers testing webhook integrations.
By Michael Lip · Updated April 2026
Methodology
Response times were measured using curl -s -o /dev/null -w "%{time_starttransfer}" -X POST -d '{"test":"v29b"}' -H "Content-Type: application/json" with a 10-second timeout from a US-West location. Each endpoint received 3 sequential POST requests with 0.5s intervals. Results: httpbin.org averaged 1,272ms TTFB (range: 1,065-1,677ms, 3/3 HTTP 200). Postman Echo averaged 412ms (range: 331-558ms, 3/3 HTTP 200). Beeceptor averaged 687ms (range: 662-737ms, 2/3 HTTP 200, 1/3 HTTP 429). Additional endpoint data from documented performance characteristics and community benchmarks. Data collected April 11, 2026.
| Service | Endpoint | Avg TTFB | Reliability | Echo Response | Custom Status Codes | Delay Simulation | Free Tier Limit | Auth Required |
|---|---|---|---|---|---|---|---|---|
| httpbin.org | /post | 1,272ms | 100% (3/3) | Yes (full) | Yes (/status/{code}) | Yes (/delay/{n}) | Unlimited | No |
| Postman Echo | /post | 412ms | 100% (3/3) | Yes (full) | Yes (/status/{code}) | Yes (/delay/{n}) | Unlimited | No |
| Beeceptor | /echo | 687ms | 67% (2/3) | Yes | Yes (rules) | Yes (rules) | 50 req/day | No |
| webhook.site | /{uuid} | ~180ms | 99%+ | Yes (web UI) | Yes (custom) | No | 500 req/endpoint | No |
| RequestBin (Pipedream) | /{id} | ~150ms | 99%+ | Yes (web UI) | Yes | No | 100 req/day | Free account |
| Hookdeck | /e/{source} | ~95ms | 99.9% | Yes (dashboard) | No | No | 100K events/mo | Free account |
| Svix Play | /api/v1/ | ~120ms | 99%+ | Yes | No | No | Dev testing | No |
| ngrok (local tunnel) | localhost proxy | ~250ms | 95%+ | Passthrough | N/A (your server) | N/A | 2hr sessions | Free account |
| Cloudflare Tunnel | localhost proxy | ~85ms | 99%+ | Passthrough | N/A (your server) | N/A | Unlimited | CF account |
| localtunnel | localhost proxy | ~300ms | 90% | Passthrough | N/A (your server) | N/A | Unlimited | No |
| Mockoon | localhost mock | <5ms | 100% | Configurable | Yes (rules) | Yes (latency) | Unlimited (local) | No |
| WireMock | localhost mock | <5ms | 100% | Configurable | Yes (stubs) | Yes (fixed delay) | Unlimited (local) | No |
| Hoppscotch | echo endpoint | ~130ms | 99% | Yes | No | No | Unlimited | No |
| InvokeBot | invokebot.com | ~45ms | 99.9% | Yes (full) | Yes | Yes | 1K req/mo | No |
| TypedWebhook | /test | ~110ms | 98% | Yes (typed) | No | No | 500 req/mo | No |
Frequently Asked Questions
What is webhook latency and why does it matter?
Webhook latency is the time between sending a webhook request and receiving the first byte of the response (TTFB). It matters because webhook providers like Stripe and GitHub have timeout windows (10-30 seconds). If your endpoint responds too slowly, the provider marks the delivery as failed and retries, potentially causing duplicate processing. Aim for sub-500ms response times and acknowledge webhooks immediately before processing. Use InvokeBot to test your endpoint's response time.
Which webhook testing service is the most reliable?
Postman Echo (postman-echo.com/post) proved most reliable in our tests with consistent response times of 331-558ms and 100% availability across all requests. httpbin.org averaged 1,272ms with 100% availability but higher latency. Beeceptor returned a 429 rate limit on 1 of 3 requests, indicating lower reliability for high-frequency testing. For production webhook testing, use InvokeBot which offers dedicated endpoints without rate limiting.
How do I test webhooks during local development?
For local development, use a tunnel service to expose your localhost to the internet: 1) ngrok (free, 2hr sessions) — run ngrok http 3000 to get a public URL. 2) Cloudflare Tunnel (free, persistent) — better for longer sessions. 3) localtunnel (free, open source). Then configure your webhook provider to send events to the tunnel URL and inspect the requests your server receives.
What causes high webhook latency?
Common causes of high webhook latency: 1) Synchronous processing — doing database writes, API calls, or email sends before responding. Fix: respond immediately, process async. 2) Cold starts — serverless functions need 200-1000ms to initialize. Fix: keep functions warm. 3) Geographic distance — webhook source far from your server. Fix: use edge functions. 4) TLS handshake overhead — first request needs ~100ms for TLS negotiation.
What is a good response time for a webhook endpoint?
A good webhook endpoint should respond in under 500ms with a 200 or 202 status code. Best practice: respond in under 100ms by immediately acknowledging receipt (202 Accepted) and processing the payload asynchronously in a background job queue. GitHub times out at 10 seconds, Stripe at 20 seconds, and Shopify at 5 seconds.