x402 Protocol Implementation

The x402 protocol uses the HTTP 402 status code to let AI agents pay for API access with stablecoins, most often USDC. When an agent hits a paywall, the server returns a 402 with payment requirements in a PAYMENT-REQUIRED header, the agent signs a gasless authorization and retries with a PAYMENT-SIGNATURE header, and a facilitator verifies and settles the payment on-chain. The protocol is governed by the x402 Foundation at the Linux Foundation.

Typical implementations run 6-12 weeks depending on complexity and scale. We handle server-side payment gating, client-side agent wallet integration, Base L2 node configuration, USDC contract interaction, facilitator deployment, and monitoring dashboards.

No. We handle all blockchain-related complexity including Base L2 node setup, USDC contract interaction, EIP-3009 gasless authorization, and payment facilitator deployment. We provide documentation and training so your team can operate the system independently.

Payments settle in stablecoins, usually USDC, on the network you choose: Base, Solana, Polygon, Arbitrum and others are supported. You can use a hosted facilitator such as Coinbase CDP or run your own for data residency or network coverage. Settlement is near-instant with minimal fees compared to Ethereum mainnet.

We implement secure wallet provisioning and key management for AI agents, including spending limits, transaction monitoring, and automatic retry logic. Agent wallets use EIP-3009 gasless authorization so agents never hold ETH for gas, reducing the attack surface.