One rail. Six moving parts.
The protocol is small on purpose. Six composable parts turn any URL into a paid, machine-callable endpoint.
x402 Facilitator
Spec-compliant verify & settle for the exact scheme. Checks the signed transfer, submits it, confirms it.
One-line middleware
Drop into Express, Next, or Hono and price any route. The Gate quotes and collects before your handler runs.
Payment Channel
Batch many tiny tolls into a single on-chain settlement — stream calls, settle once.
Transponder Kit
A client wallet with budget caps and payTo allowlists so an autonomous agent pays safely, on its own.
Escrow & settlement
On-chain escrow, receipts and facilitator bonds — verified in motion, slashable for non-settlement.
Receipt Registry
Every settled call leaves an on-chain receipt — an auditable log of who paid what, to whom, when.
What you can build.
Primitives you can wire together today, from budgeted agents to streaming settlement.
Metered agents
Give an autonomous agent a budget and let it pay per call across any priced endpoint.
Streaming settlement
Meter high-frequency calls off-chain, then batch them into one on-chain settlement.
Facilitator operators
Run a Gate, bond the token to settle payments, and earn a slice of every toll routed through you.
MCP tool payments
Wrap any MCP tool with a toll so agents pay per invocation instead of per subscription.