Mantle-402
HTTP 402 Payment Required middleware for Mantle Network Monetize your APIs with on-chain blockchain payments
Videos
Tech Stack
Node
Solidity
Web3
Description
Mantle-402 is an open-source Express.js middleware that enables API monetization through blockchain payments.
🔌 One-line integration - Add middleware to any endpoint
💰 Flexible pricing - Pay-per-request or prepaid balance
⚡ Low fees - Built on Mantle L2 for cheap microtransactions
🔒 Secure - On-chain payment verification, no chargebacks
Perfect for developers who want to monetize their APIs without complex payment integrations.
Progress During Hackathon
✅ Core middleware implementation (mantle402, mantle402Contract, mantle402Marketplace)
✅ Smart contracts deployed on Mantle Sepolia testnet (Mantle402.sol, Mantle402Marketplace.sol)
✅ TypeScript package with full type definitions
✅ Example server with multi-tier pricing
✅ Landing page with documentation
✅ npm package ready for distribution
Built from scratch during the hackathon. All code is open-source and production-ready.
Fundraising Status
Seeking Grant Funding