---
title: "FirstSales Public API"
account: firstsales
slug: firstsales-public-api
---

# FirstSales Public API

Email validation, DNS/deliverability checks, domain intelligence, and cold-email content scoring, no key needed

- Operations: 20
- Versions: 1 (latest `3856191adf12`)
- License: [Terms of Service](https://firstsales.io/terms-of-service/)
- Source: https://firstsales.io/openapi.json
- OpenAPI document: https://skmtc.dev/firstsales/apis/firstsales-public-api/revisions/3856191adf12?raw

## Operations

20 in total, by tag:

- Mail Tester (2)
- System (1)
- Tutorials (2)
- Email (3)
- DNS (4)
- Domain (3)
- Analyze (5)

Every operation, with a link to its markdown: https://skmtc.dev/firstsales/apis/firstsales-public-api/llms.txt