Six months ago, "agent commerce" was a whitepaper concept. Today there's a real stack forming:
| Circle Nanopayments | Payment rails — gas-free USDC micropayments |
| AgentCash | Wallet + execution — fetch proxy for 402 payments |
| Uniswap pay-with-any-token | Token swap — swap into required token before payment |
| Zauth | Endpoint monitoring — does the API respond? |
| Revettr | Counterparty risk — should the agent trust this entity? |
Circle Nanopayments handles the settlement — gas-free USDC micropayments that make sub-cent transactions viable.
AgentCash gives agents a wallet and a fetch proxy. Your agent calls an API, hits a 402, and AgentCash handles the payment.
Uniswap's pay-with-any-token skill is the latest addition. When an agent hits a 402 challenge for a token it doesn't hold, Uniswap swaps into the right token and retries. Composable finance for machines.
Zauth monitors endpoint reliability. Their AI agents continuously test x402 services and build a database of what works.
And Revettr scores the counterparty. Not whether the endpoint responds — whether the entity behind it is trustworthy.
Every layer in this stack was built independently by different teams. Nobody coordinated. That's how you know it's real infrastructure, not a marketing exercise.
The piece that's still forming is adoption. Most agents today don't pay for anything. But the rails are here. The first wave of agents that handle real money will need every layer in this stack.
If you're building agents that transact, start integrating now. The scoring API is live.
$0.01 per score via x402. No API keys. No accounts.