{"asset":"spar\u00e1n.eth \u26a0","contract":"0x57f1887a8bf19b14fc0df6fd9b2acc9af147ea85","orderHash":"0x69667e3ab2dd6c4b71676c69bf58ed9aa3761c388ff0be40f7653d1152110cb4","priceEth":"4.0","rail":"seaport_v1.6"}

Cardano Foundation engineers put Cardano in the official x402 kit, so AI agents can pay in ADA for services.
Their facilitator never holds keys or signs, its README says, and is not on mainnet.