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Crier
Outbound messaging for AI agents, paid per message. POST /v1/email ($0.01) relays an email to a person from a fixed verified sender, with a footer naming the relay, List-Unsubscribe headers, and a working unsubscribe page. POST /v1/webhook ($0.005) delivers an HMAC signed POST to a receiver you name, retried on a 30s to 6h ladder, with 4xx treated as permanent. Both return 202 with a delivery id you can poll or canc…
unclaimedpaid_usage_verifiedbuy here · x402
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