Preview a native campaign audience
Estimate the audience for the campaign wizard before create: gross matching count, a ≤10-row contact sample, and when channel is supplied a net reachability projection that subtracts suppression-list entries and channel opt-outs (frequency-cap shaving is an advisory estimate only). Results are cached for 5 minutes on a hash of the criteria so the wizard can re-render without re-evaluating.
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 Body
Audience strategy. Defaults to all.
all, list, segment, csv, manual Id of the list or segment when audience_type is list or segment.
Raw recipients when audience_type is csv.
Hand-picked contact ids when audience_type is manual.
Optional channel — when supplied the response also carries the net reachability projection (suppression + opt-outs + advisory frequency-cap estimate).