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Developer documentation
Add Sign in with FoundrList to your product, read founders' profiles and spend with their consent, and use public launch data.
What you can build
The basics
Every request goes to https://www.foundrlist.com over HTTPS. Sign in with FoundrList follows the OAuth 2.0 authorization code flow (RFC 6749) with PKCE (RFC 7636), so the OAuth library you already use works without changes. Endpoints are listed in the API reference and published in a discovery document.
curl https://www.foundrlist.com/.well-known/oauth-authorization-server| Credential | Prefix | Where it lives |
|---|---|---|
| Client ID | flc_ | Public. Safe in browser code and URLs. |
| Client secret | flsk_ | Your server only. Shown once when created. |
| Authorization code | flac_ | Your callback URL, exchanged within 5 minutes. |
| Access token | flat_ | Your server. Sent as a Bearer token, lasts 1 hour. |
| Refresh token | flrt_ | Your database. Lasts 60 days and rotates on use. |
Free to use
Creating apps, Sign in with FoundrList and the public data endpoints are free. Each account can create up to 5 apps.