Create autonomous AI agents that pay for API calls automatically using the x402 protocol
No subscriptions. No API keys. Just autonomous agents that pay per API call with USDC.
How Buildx402 Works
Agent Makes API Call
Your autonomous agent calls an API (AI, data, trading, etc.) just like any normal API call.
API Requests Payment
The API responds with HTTP 402 Payment Required and includes payment details (amount, recipient, network).
Agent Pays Automatically
Your agent automatically pays using USDC from its wallet. No manual intervention needed.
Agent Retries with Proof
The agent retries the API call with the transaction hash as payment proof.
API Returns Data
The API verifies payment and returns the requested data. Your agent continues working!
Example Flow
X-Payment-Currency: USDC
X-Payment-Recipient: 0x...
Agent Use Cases
AI Agents
Create AI assistants that pay for API calls per use. No subscriptions needed - just pay as you go.
Data Bots
Build data fetching bots that automatically pay for premium data feeds when needed.
Trading Bots
Deploy trading bots that pay for market data and analytics APIs autonomously.
Automation
Automate workflows that require paid APIs - agents handle payments automatically.
Analytics
Run analytics agents that pay for data processing and insights on demand.
API Integration
Integrate any x402-compatible API into your applications with autonomous payments.
Why Buildx402?
No Subscriptions
Pay only for what you use. No monthly fees or commitments.
No API Keys
Agents authenticate with payments, not API keys.
Fully Autonomous
Agents handle payments automatically - set it and forget it.
Crypto Native
Built for the crypto economy with USDC on multiple networks (Base, Ethereum, Polygon, Arbitrum, Solana).
Transparent
All payments are on-chain and verifiable.
Easy to Use
Simple framework - create agents in minutes.
Ready to Build Your Agent?
Start creating autonomous agents that pay for API calls automatically
Create Your First Agent