Build & integrate
Fiat Onramp
A hosted integration boundary, not an enabled card-payment promise.
Open Account → Finance → Onramp to see configuration status. No card details are collected in Mercenta. A missing server key or unverified integration disables hosted session creation, not just the UI button. The separate test-USDC funding route is not a fiat onramp.
Hosted session creation requires server-side Circle credentials and ONRAMP_VERIFIED=true after onboarding and route validation. Currently the protected configuration has no Onramp key; no fiat payment or hosted session was created during this release.
Card and wallet availability depend on supported provider routes. Real fiat must not be collected for valueless testnet assets. Never assume a fiat route directly funds supported test USDC on Arc.
Before enabling account funding: verify the hosted schema, allowed origins, destination binding, durable event replay protection and authoritative destination credit. A client onDepositSettled event is untrusted. Until these checks pass, Onramp remains disabled as an account top-up method.