Replay real usage against a candidate rate card
Back-test a proposed rate card against the caller’s OWN recent traffic: the request body carries candidate_card (rows of channel, country_code or *, direction mt/mo, optional sub_type, and rate_per_unit, with optional markup_bps + markup_fixed_cents and an optional human label), plus an optional window_days lookback (1–90, default 30). Every recorded usage lane in the window is priced under both the current live rates and the candidate card, and the per-lane plus total cost difference is returned. Read-only simulation — no money moves, no row is written, no billing event fires. Use it to evaluate a quoted rate swap or a new volume tier before switching. Owner, admin, or billing role.
Authorizations
Dashboard JWT token from Clerk
Headers
Stripe-style idempotency token. Pass a stable, client-generated value (1-255 chars) to dedupe retries on transient timeouts. The same key+credential+path replays the original response for 24h on 2xx (5min on 4xx, 30s on 5xx). Returns 409 if a concurrent request with the same key is already in flight; replayed responses include the Idempotency-Replay: true response header.
1 - 255Sandbox opt-in for Clerk-session-authenticated requests. Set to true to route the call through the test-mode pipeline: no real provider delivery, no credits deducted, response meta.test_mode: true. Ignored for live API keys (dv_live_sk_*) — server-to-server clients must use a test-prefixed key (dv_test_sk_*) to exercise sandbox. Test-prefixed keys unconditionally enable sandbox regardless of this header.
true, false Response
Successful response.