Test Mailchimp webhooks
Mailchimp sends webhooks for audience events such as subscribes, unsubscribes, profile and email changes, cleaned addresses, and campaign sends. Capture them on a free webhooks.cc endpoint to see exactly what Mailchimp sends, then replay deliveries or forward them to your local handler.
No credit card · 50 requests/day free · or get a guest URL without an account
Prefer a walkthrough? Read the local webhook testing guide.
How to test Mailchimp webhooks
- 1
Create a webhook endpoint
Sign in free with GitHub, Google, or email to create a persistent endpoint — or grab an instant guest URL at webhooks.cc without an account.
- 2
Point Mailchimp at your URL
Paste the endpoint URL into Mailchimp: Audience → Manage Audience → Settings → Webhooks → Create New Webhook.
- 3
Inspect what arrives
Each delivery appears live in the dashboard with method, headers, body, query parameters, and source IP.
- 4
Forward to localhost or assert in CI
Run whk tunnel <port> to forward webhooks to a local server, or use the TypeScript SDK to wait for and assert on deliveries in tests.
Mailchimp webhook authentication
| Auth header | x-mailchimp-signature |
|---|---|
| Algorithm | HMAC-SHA256 |
| Verification in webhooks.cc | Capture deliveries to inspect raw signature material |
Signing is optional and turned on per webhook. The header has the form t={timestamp},v1={hex}, and the HMAC covers {timestamp}.{raw_body}.
New to signature verification? Read the webhook signature verification guide.
Everything in one place
- Live dashboard — see deliveries the moment they arrive
- Forward to localhost with whk tunnel
- Replay any captured request to any URL
- Mock responses with custom status, headers, and body
- TypeScript SDK assertions for CI
- MCP server for AI coding agents
Mailchimp webhook questions
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Your Mailchimp webhook URL is seconds away
Sign up free, create an endpoint, and point Mailchimp at it.
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