webhook.site expires in 7 days. That's fine for a quick test — but terrible if you're an AI agent running on a cron schedule, or a developer building a production integration that needs a persistent backend. Here's a complete comparison of the best alternatives.
webhook.site is genuinely useful. You open it, get a URL, and immediately see incoming requests. For one-off debugging, it's perfect.
But it has a critical flaw: your endpoints expire after 7 days. For most developers, this is annoying but manageable. For automated workflows — especially AI agents running on cron schedules — it's a silent disaster waiting to happen.
Picture this: you build an AI agent that uses webhook.site as its form backend. The agent tests it, everything works. Seven days later, the agent runs its next cycle and discovers the endpoint is gone. The forms were silently failing for a week. Any signups during that window? Lost.
This has happened. Multiple times. To real projects.
| Tool | Free Tier | Persistent? | No Account? | API Access | Best For |
|---|---|---|---|---|---|
| HookRelay | Free forever | Yes — no expiry | Yes | Yes (GET/POST) | AI agents, permanent backends |
| webhook.site | Free | 7 days only | Yes | Yes | Quick one-off testing |
| RequestBin | Limited | Expires | Yes | Limited | Basic webhook inspection |
| Pipedream | Free (limited) | Permanent | Account required | Yes | Workflow automation |
| Hookdeck | Free plan | Permanent | Account required | Yes | Production webhook routing |
| ngrok | Free (limited) | Session-based | Account required | Limited | Local dev tunneling |
| Beeceptor | Free (limited) | 30 days | Yes | Limited | API mocking |
HookRelay was built specifically to solve the expiry problem. Endpoints never expire. No account needed — just pick a UUID and start using it. Submit data via POST, retrieve it via GET. Designed with AI agents and automated workflows in mind.
The original and most popular webhook inspector. Gives you a URL instantly with a real-time browser UI. Great developer experience for temporary testing — terrible for anything that needs to keep running.
Pipedream is a full workflow automation platform. If you need to trigger downstream actions (send an email, write to a database, post to Slack) on receipt of a webhook, Pipedream is excellent. Overkill for simple webhook capture.
Hookdeck is built for production webhook reliability — retry logic, fan-out, delivery guarantees. If you're building a production system that consumes external webhooks (Stripe, GitHub, etc.), Hookdeck is the right tool. For simple form backends or agent testing, it's too heavy.
ngrok tunnels traffic to your local machine. It's the right tool when you need to test incoming webhooks to a local development server. Completely wrong tool if you don't have a local server to tunnel to — which is most agent/automation use cases.
AI agents have a specific problem that most webhook tools weren't designed for. An agent running on a 30-minute cron job might use webhook.site as a form backend today, then discover 7 days later (via a silent failure) that the endpoint expired. The agent doesn't know it's broken.
What AI agents need from a webhook tool:
HookRelay was built specifically with these constraints in mind. It's the webhook tool designed for the agentic AI era.
For quick, one-off webhook testing: webhook.site is still great. Open it, get a URL, watch requests come in. No complaints for this use case.
For persistent form backends (no expiry): HookRelay. Free, no account, never expires, API-accessible.
For production webhook routing with retry logic: Hookdeck or Pipedream.
For local development tunneling: ngrok.
The key insight is that most webhook tools were built for human developers doing manual testing. As AI agents become more common — running autonomously, deploying their own backends, operating without human supervision — they need tools that don't require manual renewal or account management.
Permanent webhook endpoints. No account. No expiry. Just pick a name and go.
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