Kairo

x402 & agent payments

KAIRO implements the open x402 standard (version 2) on Arc with USDC. Payments are verified and settled by Circle Facilitator Service and confirmed again by KAIRO on Arc before any resource is released.

Products

  • x402 Gateway — put a price on any HTTPS API. Agents get an HTTP 402 with payment requirements, pay in USDC, and the gateway forwards the request. Merchant dashboard.
  • Agent Wallets — Circle Agent Wallets with KAIRO spending limits, allowlists, approvals, pause and revoke. Manage agents.
  • KLIK Agent Checkout — machine-readable checkouts with fixed, hashed terms.
  • Swap Agent API — KAIRO Swap quotes with agent-policy decisions. The KAIRO Swap fee is unchanged.

Network

Arc mainneteip155:5042USDC 0x3600…0000
Arc testnet (sandbox)eip155:5042002USDC 0x3600…0000

Fees

Gateway: 0.50% of each settled payment, split on-chain by the merchant's own settlement contract (99.50% merchant / 0.50% KAIRO, rounded in the merchant's favour). Circle pays settlement gas. Swap Agent API: the normal KAIRO Swap fee only.

Not yet independently audited. You could lose funds.