Build email deliverability into your product
Verify addresses, find contacts, and monitor deliverability with a developer-friendly API, built on the same engine that powers SpamCipher. API access is rolling out to developers now.
An API built on a proven deliverability engine
The SpamCipher API exposes the verification and deliverability engine that already powers the platform. We are rolling it out to developers with a full reference, examples, and SDKs. Tell us what you are building and we will set you up with access and documentation.
Built for every workflow
Real-time, bulk, discovery, and monitoring, all under one key.
Real-Time Validation
Verify a single address in milliseconds. Built for signup forms, checkout, and CRMs to stop bad emails at the source.
Bulk Validation
Send a list or upload a file for batch verification, with no restriction on file size or number of emails beyond your available credits.
Email Finder
Find and verify business email addresses from a name and a company domain, programmatically and at scale.
Deliverability & Monitoring
Check domain health and authentication, watch blacklists and reputation, and pull DMARC insights, with webhooks for alerts.
From access to clean data in four steps
Request access
Tell us what you are building. We share API access, your key, and the full reference.
Send a request
Call the API over HTTPS from any language. Authenticate with your key.
Get a structured result
Receive a clear, machine-readable response: valid, invalid, catch-all, disposable, role, and more.
Act in real time
Accept the signup, flag the contact, or queue it for review, in the time it takes to submit a form.
What teams build with the API
Validate at signup
Verify every address the moment a user submits a form, so bad data never enters your list.
Clean lists before you send
Run entire lists through bulk verification before a campaign to cut bounces and protect your reputation.
Enrich and dedupe your CRM
Find missing business emails and verify the ones you have, straight from your CRM or data pipeline.
Monitor deliverability
Pull domain health, blacklist, reputation, and DMARC signals on a schedule, with webhooks for alerts.
Automate with no code
Wire validation into your workflows with Zapier, Make, and n8n, no engineering required.
Build it into your product
Embed verification in your own app or platform and offer clean data to your users.
Use it however you work
The API speaks plain HTTP, so it works from Node.js, Python, PHP, Ruby, Go, Java, and anything else. Prefer no code? Connect SpamCipher through Zapier, Make, n8n, and 100+ integrations.
