LetsFG — free programmatic flight search (PFS) for AI agents

[Efistoffeles (Efistoffeles)]

LetsFG's PFS (Programmatic Flight Search) is a free, server-side flight search built for AI agents — natural-language search across 400+ airlines, no local browser required.

Docs: https://letsfg.co/for-agents
GitHub: https://github.com/LetsFG/LetsFG

Note: this is PFS, not the separate paid Developer API under /developers on letsfg.co — different product/auth, please don't conflate them.

Requested tools (read-only, no booking):

• Search Flights — POST /api/search (free, natural-language query)
• Poll results — GET /api/results/{searchId}
• Optionally, Check Flight Status — POST /api/trips/check-flight (no auth needed)

Auth: 90-day Bearer token via one-time zero-amount card setup (POST /api/agent-access/request → POST /api/agent-access/verify, nothing charged — or the letsfg auth CLI command). Rate limit: 60 req/min per agent.