Welcome to GTMAPIs
GTMAPIs is API-first GTM data-quality infrastructure for outbound agencies and GTM engineers. The available-now public API products are Email Validation and Premium Catch-All Recovery: validate lists, recover send-worthy catch-alls, protect deliverability, and control credit spend without stitching together UI tools or brittle scripts.What Makes Us Different
Our smart credit system only charges for high-value personal emails:- Valid personal emails → 1 credit when they are High-Value Validations
- Role-based emails (
info@,support@) → 0 credits - Catch-all domains → 0 credits
- Invalid, risky, or unknown results → 0 credits
Key Features
4-Layer Validation
Syntax, DNS, SMTP, and catch-all detection with canonical result semantics
B2B Quality Scoring
Automatically categorize emails by outbound value
API-First Workflows
Stable public endpoints, OpenAPI, SDKs, CLI examples, and agent-readable docs
CSV Upload
Process larger lists through signed CSV upload and asynchronous validation jobs
Quick Start
Get started in 3 simple steps:1
Create an Account
Sign up at gtmapis.com
2
Get Your API Key
Generate a test or live API key from your dashboard
3
Make Your First Request
Send a POST request to validate emails
Production Ready
- API: api.gtmapis.com (Railway)
- Dashboard: gtmapis.com (Vercel)
- Rate Limit: 10,000 requests/minute per API key, plus 1,000 requests/minute per IP for abuse protection
- Public contract: Email Validation, Premium Catch-All Recovery, API-key credit balance, CSV validation jobs, and health probes are documented in the OpenAPI spec
Need Help?
Quick Start Guide
Get up and running in 5 minutes
API Reference
Complete API documentation