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FirstSales Developer Platform gives developers and AI agents a stable way to inspect and manage FirstSales without relying on private app routes. Use the platform when you need to:
  • Create and manage campaigns, contacts, inbox actions, connectors, knowledge bases, offerings, tracking domains, billing reads, members, groups, domains, and API keys.
  • Run FirstSales from Codex, Claude Code, Gemini, Claude.ai, scripts, or CI.
  • Use a stable public contract instead of app-private routes that can change without notice.
The Developer API is contract-first. Provider callbacks, tracking pixels, unsubscribe handlers, support/admin routes, and destructive account deletion flows are intentionally not public API endpoints.

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Base URL

https://api.app.firstsales.io
All public endpoints live under /api/v1.

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First request

curl https://api.app.firstsales.io/api/v1/whoami \
  -H "Authorization: Bearer $FIRSTSALES_API_KEY"

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CLI

npm install -g @firstsales.io/cli
firstsales whoami --json