AI402

AI402

Monetize Any MCP Server, AI Model, or API

Created on 24th June 2025

AI402

AI402

Monetize Any MCP Server, AI Model, or API

The problem AI402 solves

AI402 lets resource owners easily monetize their tools and lets users seamlessly pay for exactly what they need.

For Resource Owners

  • Easy monetization - Set your price and instantly get an x402-gated URL for your MCP server, API, or AI model without building any payment logic
  • Instant USDC payments - Receive payments directly to your CDP wallet with instant settlement on Base Sepolia
  • Ready-to-share playground - Get a playground link to share with users so they can test your tools for free before paying
  • Track everything - Monitor usage, earnings, and transactions through the dashboard without complex analytics setup

For Users & AI Agents

  • Seamless payments - Pay and access resources instantly with automatic x402 payment handling, no accounts or setup required
  • Usage-based pricing - Pay only for what you actually use, from tiny amounts like $0.001 per API call to larger services
  • AI agents pay automatically - AI agents can discover, pay for, and use tools independently using their CDP wallets

What This Enables

  • No payment infrastructure needed - Creators focus on building great tools instead of payment systems
  • Micro-transactions that work - Finally makes sense to charge small amounts for individual API calls or tool usage
  • Autonomous AI workflows - AI agents can build complex workflows by paying for multiple services automatically

AI402 removes all the complexity of monetizing digital tools while making it effortless for users to access exactly what they need when they need it.

Challenges I ran into

  • MCP Client SDK with Payment Proxy Integration - The official MCP Client SDK wasn't designed to work through payment proxies, so I created a custom Payment Enabled MCP Client that extends the official SDK to try normal calls first, then fall back to x402-axios for payments while preserving session headers. Discovered auth headers needed to be inside requestInit.headers rather than passed directly to transport constructors.

  • Multi-Layer Authentication Forwarding - Managing user-provided API keys, server-stored credentials, and MCP session headers all flowing through the same proxy required building intelligent header forwarding in proxyService.js that combines different auth types while maintaining security isolation and preserving MCP sessions through payment flows.

  • Bedrock + MCP Tool Orchestration - Creating an AI playground where Bedrock models analyze messages, decide when to use MCP tools, and generate responses required building multi-step orchestration using structured prompts to get JSON tool calls from Bedrock, execute tools via MCP SDK with payment handling, then feed results back to Bedrock for natural responses.

Tracks Applied (4)

Best Use of x402pay + CDPWallet

AI402 creates a fully autonomous payment ecosystem by combining x402 micropayments with CDP wallet infrastructure: Seam...Read More

Best Use of CDP Wallet

AI402 uses CDP wallets as the foundation for a two-sided autonomous payment marketplace: Agent-side payments - AI agent...Read More

Best Use of x402pay

AI402 uses x402 for instant USDC micropayments across three key areas: MCP Server monetization - Built custom PaymentEn...Read More

Multiple Prizes: AWS Challenge: Best Use of Amazon Bedrock

AI402 uses Amazon Bedrock as the foundation for AI model monetization through deep SDK integration and custom infrastruc...Read More
Amazon Web Services

Amazon Web Services

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