Solana Hackathon Submission

x402 Payment Channels

Payment Channels Protocol for Solana

Watch Our Pitch

See x402 in action - a complete walkthrough of our payment channels solution

Project Overview

BoberPay brings HTTP 402 Payment Required to life with Solana payment channels. Our protocol enables micropayments for API requests with 99.8% cost savings compared to solana transaction, making true pay-per-use APIs economically viable.

Built for developers, BoberPay provides framework-agnostic TypeScript SDKs that integrate seamlessly with Express, NestJS, Fastify, and any Node.js HTTP framework.

The Problem This Solves

Traditional On-Chain Payments (scheme: 'exact')

Every API call → Blockchain transaction → 400-800ms latency → $0.0005 fee
❌ Too slow for real-time APIs
❌ Too expensive for sub-cent payments
❌ Can't scale to 100+ requests/minute

Payment Channels Solution (scheme: 'channel')

Setup: 1 on-chain transaction (open channel)
Usage: Unlimited off-chain payments → <10ms latency → $0 fees
Settle: 1 on-chain transaction (claim batch)

✅ 91% faster than on-chain
✅ 94% cheaper overall
✅ Scales to thousands of req/min

Our Solution

Payment Channels

Adapting x402 to accept unidirectional payment channels.

Developer-First

Simple middleware integration with full TypeScript support. Add payment protection to any route in 3 lines of code.

Framework Agnostic

Works with Express, NestJS, Fastify, and any Node.js framework. No vendor lock-in.

Technical Implementation

Solana Program (Rust + Anchor)

Custom Solana program managing payment channel accounts, state transitions, and settlement logic with cryptographic verification.

TypeScript SDKs

Server SDK with middleware for Express/NestJS/Fastify. Client SDK for making paid requests with automatic channel management.

Off-Chain Payment Proofs

HTTP headers carry Ed25519-signed payment proofs with nonce-based replay protection. Verified in <1ms without blockchain transactions.

Channel State Machine

Robust state management handling Open, Closing, Closed, and Disputed states with automatic reconciliation and timeout protection.

Key Achievements

99.8%

Cost Reduction

<1ms

Payment Verification

NPM Packages

Use Cases

AI/ML API Services

Charge per inference for LLM APIs, image generation, or model predictions. Fair pricing based on actual usage without monthly minimums.

Data APIs

Real-time financial data, weather information, or analytics APIs with per-request pricing. Pay only for the data you need.

Compute-as-a-Service

On-demand computation, rendering services, or code execution. Dynamic pricing based on computational complexity.

Content APIs

Premium content access, research papers, or media streaming. Micropayments enable article-by-article or minute-by-minute pricing.

Project Links

Try x402 Today

Start accepting micropayments in your APIs with just a few lines of code

Get Started View Examples