x402 Payment Gateway

Enable AI agents to autonomously pay for database queries using USDC cryptocurrency on Base network via the x402 payment protocol.

What is x402?

The x402 Payment Gateway transforms your SerenDB database into a monetized API service where AI agents can autonomously:

  • Pay per query using USDC stablecoin on Base network

  • Execute SQL queries after depositing funds

  • Track spending with immutable blockchain audit trails

  • Access databases without human intermediaries

Key Features

Autonomous AI Agent Payments

AI agents can deposit USDC, check balances, and execute queries without human intervention.

Blockchain-Verified Transactions

All payments are verified on-chain using Base network (Ethereum L2) for low fees and fast confirmation.

Flexible Pricing Models

Configure pricing based on:

  • Rows returned (per 1000 rows)

  • Query complexity (PostgreSQL EXPLAIN cost)

  • Data transfer (per MB)

  • Query type (SELECT, INSERT, UPDATE, DELETE)

  • Time-based usage

Multi-Provider Support

Multiple database providers can register and configure independent pricing structures.

Immutable Audit Trail

Every transaction is recorded both on-chain and in the gateway database for complete transparency.

How It Works

1. AI Agent requests database query
   ↓
2. Gateway checks agent's USDC balance
   ↓
3. [No balance] → HTTP 402 Payment Required
   ↓
4. Agent deposits USDC on Base network
   ↓
5. Gateway verifies on-chain payment
   ↓
6. Query executed and results returned
   ↓
7. Cost deducted from agent's balance

Quick Links

Use Cases

Database Monetization

Convert your SerenDB instance into a revenue-generating API service.

AI Agent Data Access

Enable autonomous agents to purchase database access for analytics, reporting, or machine learning.

Pay-per-Use APIs

Offer fine-grained pricing based on actual usage rather than subscription tiers.

Blockchain Audit Trails

Maintain cryptographic proof of all transactions for compliance and accounting.

Production Deployment

The x402 Gateway is deployed at: https://x402.serendb.com/

All endpoints are production-ready with:

  • Rate limiting

  • SQL injection prevention

  • CORS security headers

  • Encrypted API keys

  • 99.9% uptime SLA

Getting Started

Ready to monetize your database? Start with our Quick Start Guide.

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