Payment Infrastructure
for AI Agents

Premium x402 facilitator for instant USDC micropayments on Base + Solana.
No accounts. No API keys. Just sign and pay.

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✓ Self-Hosted
✓ Open Source
✓ Zero Fees
3 lines to accept payments
// 1. Return 402 with payment requirements
if (!hasPaid) return Response.json({ payTo: "0x...", amount: "10000" }, { status: 402 });

// 2. Verify payment signature
const { valid } = await fetch("https://checkpoint.app/api/v2/x402/verify", { body: payment });

// 3. Serve resource if valid
if (valid) return Response.json({ data: "Your API response" });

Choose Your Path

How will you use CheckPoint?

How It Works

Simple 4-step payment flow

1

Request Resource

Agent calls your API

2

Return 402

Server sends payment terms

3

Sign Payment

EIP-3009 (Base) or Ed25519 (Solana)

4

Settle & Serve

On-chain transfer, resource delivered

📚

Read the Docs

Comprehensive API reference and guides

View Documentation →
🧪

Test in Playground

Try the API without writing code

Open Playground →
📋

View Examples

Copy-paste integration code

Browse Examples →
⚙️

Deploy Your Own

One-click deployment to Vercel

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API Surface

6 endpoints. That's it.

Payments

POST/api/v2/x402/verify
POST/api/v2/x402/settle

Discovery

GET/api/discovery
POST/api/discovery

Admin

GET/api/health
POST/api/keys