FI

FirstSales Public API

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

Terms of Service20 operations20 schemas1 revision

Changes

Full history

Source

View schema
Spec
OpenAPI 3.1.0
Document
firstsales.io · JSON, 75 KB
Retrieved
Oct 19, 2026, 17:29 UTC
Digest
3856191adf12

For agents

Every page here has a markdown twin. The overview is one fetch; the llms.txt lists every operation with a link to its own markdown.

curl https://skmtc.dev/firstsales/apis/firstsales-public-api.md
curl https://skmtc.dev/firstsales/apis/firstsales-public-api/llms.txt