Killfear One, by Killfear Engineering, is the validation step for your GTM agent. Nine checks in one API: phone validation, phone intel, email verification, email extras, email depth, IP intel, domain intel, signup risk and contact check. Email checks return SEND / SEND_WITH_CAUTION / DROP with a reason. Credits never expire. Bounce credit-back up to 5% of monthly credits. No live carrier lookup or inbox verification. Free beta: 100 checks per key.
