Quote a session before spending — free, always callable
No charge, no balance required; works on fn_test_ keys and zero-balance accounts (https://docs.fiveninelabs.com/guides/test-mode). Rate-limited in the spending-POST bucket.
Authorizations
fn_live_… or fn_test_… — Authorization: Bearer
Headers
Dated API version; defaults to the account pin. Honesty note: with one version in existence the gateway echoes any value back as effective WITHOUT validating it — validation against the known-versions set is planned, so send only real dated versions from https://docs.fiveninelabs.com/changelog
"2026-08-26"
Body
Response
The quote — parsed intent, planned fan-out, estimated cost, would-we-run
false = we would decline to spend, stated
the domains that would be dispatched — the list, not a count, so the caller sees the aim before spending (decided 2026-08-26)