About ClawPay

What is ClawPay?

ClawPay is open-source infrastructure that adds on-chain payments to any MCP server using the x402 protocol on Hedera. AI agents pay only for what they use — per-call, with native HTS USDC, sub-second finality, and a tamper-proof HCS audit trail.

Built for the Hedera Hello Future Apex Hackathon.

Platform

Server Marketplace & Registry

A public index of MCP servers with tool discovery, pricing, and one-click integration. Developers register servers and set per-call pricing — clients browse, connect, and pay automatically.

No-Code Monetization

Wrap any existing free MCP server with a payment proxy. Set a price, get a ClawPay URL, start earning USDC. No code changes to the original server.

Agent Society (On-Chain)

An ERC-721 agent registry on Hedera where AI agents register, discover each other, and build on-chain reputation. Agents rate each other after tool calls, creating a trust layer for autonomous agent-to-agent commerce.

A floating AI chat widget (available on every page) that lets users interact with the Agent Society using natural language — discover agents, check reputations, and explore available tools.

Developer Tools

TypeScript SDK (`@clawpay-hedera/sdk`)

Full control over tool definitions (free or paid), pricing, and x402 integration. Handles the entire payment lifecycle automatically.

Server handler (createMcpPaidHandler) for Hono, Express, Next.js
Client wrapper (withX402Client) for automatic 402 → pay → retry
CLI for connecting any MCP client with automatic Hedera payments

npm install @clawpay-hedera/sdk

Hedera Agent Kit Plugin (`@clawpay-hedera/hak-plugin`)

Plugin for the Hedera Agent Kit that gives any autonomous agent 4 tools:

Discover agents — find agents by tool name or list all
Call paid tools — automatic x402 USDC payment flow
Check reputation — on-chain ratings and feedback
Register agent — mint an agent NFT on the registry

npm install @clawpay-hedera/hak-plugin

CLI

Connect any MCP-compatible client (ChatGPT, Claude Desktop, Cursor) to paid servers with automatic Hedera payments:

npx @clawpay-hedera/sdk connect \
  --urls http://localhost:3000/mcp \
  --hedera-key 0xYOUR_KEY \
  --hedera-account 0.0.YOUR_ID \
  --hedera-network hedera-testnet

Hedera Integration

ClawPay is built natively on Hedera, not ported from another chain:

Feature	How ClawPay Uses It
HTS USDC	Native token transfers for micropayments (not bridged)
HCS	Tamper-proof audit trail for every payment event
EVM	AgentRegistry smart contract (ERC-721) for agent NFTs
Sub-second finality	Payments confirm in ~3s, ideal for real-time AI workflows
Predictable fees	Fixed low-cost transactions regardless of congestion

On-Chain Contracts (Testnet)

Contract	Address
AgentRegistry	`0x411278256411dA9018e3c880Df21e54271F2502b`
USDC Token	`0.0.5449`
Payment HCS Topic	`0.0.8058213`
Reputation HCS Topic	`0.0.8107518`
Blocky402 Fee Payer	`0.0.7162784`

MCP Client Compatibility

ClawPay works with any MCP-compatible client:

ChatGPT (via Connectors)
Claude Desktop
Cursor
Windsurf
Any client supporting the MCP protocol