Gateway receives payment
The buyer attaches a PAYMENT-SIGNATURE header. The gateway forwards the signed authorization to the facilitator — buyers never call the facilitator directly.
Verify and settle on-chainpayments for the gateway
The facilitator validates signed payment authorizations and submits settlement transactions. Gateway processes call /verify and /settle over HTTP — buyers never talk to the facilitator directly.
Workflow
Where the facilitator sits in the stack
After a buyer attaches a PAYMENT-SIGNATURE header, the gateway asks the facilitator to verify and settle before proxying to upstream.
Verify authorization
The facilitator validates the signature, scheme, network, asset, and amount against the gateway's x402 accept options via POST /verify.
Settle on-chain
After verification succeeds, the facilitator submits the settlement transaction on-chain via POST /settle and returns the transaction hash.
Proxy upstream
The gateway retries the buyer request with proof of settlement, then proxies the response from your upstream API unchanged.
Capabilities
Settlement infrastructure for every gateway
Hosted facilitator for every seller gateway, with dashboard visibility into verify and settle traffic.
Verify endpoint
Validate signed payment authorizations before any on-chain work. Gateway processes call /verify with the buyer's PAYMENT-SIGNATURE payload.
On-chain settlement
Submit exact and batch-settlement transactions on supported networks. Returns transaction hashes the gateway can attach to retried requests.
Supported capabilities
Discover networks, schemes, and x402 versions from GET /supported. Match gateway endpoint accepts to what your facilitator can settle.
Hosted facilitator
Verify and settle are included with every Ax402 gateway. Match endpoint accepts to supported networks and assets in the dashboard.
Enterprise self-hosted
Run a dedicated facilitator in your own environment — private key custody, custom networks, and SLA-backed operations. Available by engagement through AxLabs.
Request visibility
The seller dashboard logs verify and settle events per gateway hostname — filter by type, result, and time window.
Supported networks
Discover what your gateway can settle
Query supported networks and schemes from the hosted facilitator. Match endpoint accepts before you publish routes.
curl -s https://facilitator.ax402.io/supported | jq .All supported chains with exact and batch-settlement schemes are returned by the facilitator supported endpoint.
Documentation
Go deeper in the facilitator guide
Stack role, supported networks, and gateway integration are documented for sellers.
Start with the hosted facilitator
Every Ax402 gateway includes hosted verify and settle. Need dedicated infrastructure? See enterprise options on our contact page.