x402 Protocol Implementation
End-to-end implementation of Coinbase's x402 payment protocol — from HTTP 402 server setup to USDC settlement on Base L2.
Overview
The x402 protocol enables AI agents to pay for API access using USDC on Base L2 via the HTTP 402 status code. We provide full implementation services — from server-side payment gating to client-side agent integration.
What We Build
Server-Side Implementation
- HTTP 402 response configuration with payment requirement headers
- Payment verification middleware integration
- Facilitator setup for on-chain settlement
- Resource access control and metering
Client-Side Agent Integration
- AI agent wallet provisioning and key management
- EIP-3009 gasless authorization signing
- Payment negotiation and automatic retry logic
- Transaction monitoring and receipt handling
Infrastructure
- Base L2 node configuration and RPC setup
- USDC contract interaction and balance management
- Payment facilitator deployment and configuration
- Monitoring, alerting, and analytics dashboards
Engagement Model
Typical implementations run 6-12 weeks depending on complexity and scale.
Frequently Asked Questions
What is the x402 protocol and how does it work?
The x402 protocol uses the HTTP 402 status code to enable AI agents to pay for API access using USDC on Base L2. When an agent hits a paywall, the server returns a 402 response with payment requirements, the agent signs a gasless USDC authorization, and the facilitator settles the payment on-chain.
How long does an x402 implementation take?
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.
Do we need blockchain expertise on our team?
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.
How are payments settled?
Payments settle in USDC on Base L2 (Coinbase's Ethereum layer-2 network). We deploy a payment facilitator that handles on-chain settlement, transaction verification, and receipt generation. Settlement is near-instant with minimal gas fees compared to Ethereum mainnet.
What about security for AI agent wallets?
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.
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