A fail-closed carrier-eligibility decision in one call. Send a carrier's MC number; get a verdict.
Dispatch only when eligible is true. Unknown carriers, hard-stops (debarment, OFAC,
do-not-use), and a degraded backend all return eligible:false — it never fails open.
curl -X POST https://165.227.65.218.nip.io/v1/eligibility \
-H "x-api-key: YOUR_KEY" \
-H "content-type: application/json" \
-d '{"mc_number":"16536"}'
Returns: eligible, found, tier, reasons[],
decision_id, ruleset_version, data_as_of, evaluated_at.