Cardano's x402 Facilitator Released, But Mainnet Test Lags Behind
The Cardano Foundation has released an x402 facilitator for the Cardano blockchain, which allows software to pay for services in real-time using ADA or other native tokens. The implementation is documented on GitHub as an x402 v2 facilitator written in Java and includes a PostgreSQL-backed journal, fenced state transitions, and an asynchronous reconciler to handle edge cases.
The one working demonstration of the facilitator ran end-to-end on Cardano's preprod test network, with a real on-chain transaction confirming the flow. However, nothing has been executed against mainnet yet, which is a crucial distinction for autonomous payments (pagos autónomos) for AI agents.
Cardano's x402 facilitator allows developers to interact through four endpoints: POST /verify checks whether a signed payment is valid, POST /settle submits it and confirms it landed, GET /supported lists which protocol versions and networks the service serves, and GET /health gives a human-readable status check. The Cardano build supports three transfer methods, giving builders flexibility in how funds are held before release.