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…n-1 fan-out inside)
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Industry: Agent payments / security.
Subcento gates a transaction BEFORE an AI agent signs it — one POST /check, x402-paid (0.002 USDC on Base), Ed25519-signed verdict back.
Against the inclusion checklist in the README:
subcento_engine.py::jev_semantic_checkposts typed questions to the official TypeSafe API (api.typesafe.ai/v1/systemone, version pinnedjev-1.14.0) in a single 3-in-1 fan-out —is_drainer_or_scam(noul),risk_level(choice),intent_match(choice) — and parses the answers into deterministic SAFE/CAUTION/BLOCK logic (mismatch alone ⇒ CAUTION, never BLOCK: anti false-positive).test_jev_v2.pypasses 6/6 (fan-out, CAUTION/BLOCK thresholds, fallback ladder, fail-closed guards, end-to-end); the service itself is live at https://subcento.alterfield.com with a public x402scan listing.Context: the pre-sign verification lane already lost two silent guards (dormant listings on x402scan); Subcento's difference is signed evidence + OFAC + official Jev semantics + fail-closed, sold machine-to-machine.