Mailchimp webhooks
Test and debug Mailchimp webhooksfor audience and campaign events
Capture subscriber changes and campaign events as Mailchimp sends them, so your CRM sync and automations work from real payloads.
See every Mailchimp event your app receives
Mailchimp webhooks power CRM sync, lead scoring and multi-channel campaigns. When events fail or get lost, automations break and leads go cold.
Hooklistener keeps every Mailchimp request with its headers and body. Check where requests come from, inspect subscriber data, and use replay (Pro) to test your marketing stack.
Mailchimp webhook challenges
Webhook security gaps
Mailchimp webhook URLs are public, so anyone who finds one can post fake events into your data.
Subscriber sync issues
Subscribe and unsubscribe events get lost, and your CRM drifts from your audience without anyone noticing.
Automation trigger failures
Campaign events don't fire consistently, and you cannot tell whether Mailchimp sent nothing or your handler failed.
How Hooklistener helps with Mailchimp webhooks
Inspect who sent each Mailchimp request
Read the source IP, headers and body of every request to your Mailchimp webhook URL, so a fake event posted to a public URL stands out from a real audience update.
Inactivity monitors for subscriber events
Get an email, Slack or signed-webhook alert when Mailchimp subscribe and unsubscribe events stop arriving, before your CRM drifts from your audience.
Replay (Pro) audience events
Resend a captured Mailchimp subscribe or profile update to localhost or staging to tell whether a failed automation is Mailchimp's doing or your handler's.
Try it: point Mailchimp at a free webhook URL or run a test with the webhook tester.
Mailchimp automation workflows
CRM synchronization
Keep Salesforce, HubSpot or a custom CRM in sync, and confirm each subscriber update arrived.
Lead scoring
Use email engagement to score leads, and check the events behind each score.
Multi-channel campaigns
Coordinate email with SMS, ads and direct mail using webhook events you have inspected.
Replay a failed webhook without re-triggering the provider
Once a delivery is captured, you can resend its exact headers and body to localhost, staging or production from the dashboard or through your coding agent over MCP, so the provider never has to fire a new event. Replay is on Pro and above. Read the replay guide.
Comparing webhook debugging tools?
See how Hooklistener stacks up against webhook.site, RequestBin, Beeceptor, Hookdeck and ngrok in the best tools to capture and inspect webhook payloads, or read the head-to-head pages for Hooklistener vs ngrok and Hooklistener vs Beeceptor.
Frequently asked questions
How do I check that a Mailchimp webhook is genuine?
Hooklistener records the source IP and headers of every request, so you can compare a suspicious event with real ones. Blocking unwanted requests stays in your own handler.
Can I replay subscriber events?
Yes. Replay is on Pro and above. Resend a captured subscribe, unsubscribe or profile update to test CRM sync and automation logic.
Do you capture all Mailchimp events?
Hooklistener captures every request Mailchimp sends to the endpoint, whichever events you enable on the webhook.
Can marketing teams use this?
Yes. Send a shareable debugger link for a captured event so marketers can see what Mailchimp delivered without touching code.
Know exactly what Mailchimp sent
Capture and inspect every Mailchimp webhook, with replay (Pro), so subscriber and campaign data stays accurate.