qntx

qntx / r402

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x402 Payment Protocol SDK for Rust.

ethereum rust solana x402 x402-facilitator
141
28
100% credibility
Found Feb 17, 2026 at 50 stars 3x -- GitGems finds repos before they trend. Get early access to the next one.
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AI Analysis
Rust
AI Summary

Rust library crates implementing the x402 HTTP payment protocol for secure micropayments on EVM and Solana blockchains with server middleware and AI agent integrations.

How It Works

1
💡 Discover simple web payments

You learn about a friendly way to charge tiny fees for your website content using digital wallets.

2
📦 Grab the easy toolkit

Download this free helper that makes adding payments to your site a breeze.

3
🔗 Connect your money handler

Link it to a secure service that manages the payments behind the scenes.

4
💰 Set your gentle prices

Choose small amounts like a penny per photo or page, and turn on payment gates.

5
🚀 Launch your paid site

Publish your site, now it kindly asks for payment before special content.

6
👤 Visitor wants premium stuff

Someone clicks your exclusive area and sees a simple 'Pay to view' prompt.

7
💳 They pay with a tap

They confirm with their phone wallet, payment zips through instantly.

🎉 Access granted, you earn!

They enjoy the content right away while you get paid automatically and happily.

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Star Growth

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AI-Generated Review

What is r402?

r402 is a Rust SDK for implementing Coinbase's x402 payment protocol, turning HTTP 402 responses into real micropayments across EVM and Solana chains. Developers get client-side signing for gasless ERC-3009/Permit2 transfers, server middleware to gate paid routes, and facilitator tools for on-chain settlement—handling the full x402 payment flow without custom boilerplate. It supports 44 built-in chain deployments, so you plug in prices like "1 USDC" and get production-ready payment gateways.

Why is it gaining traction?

Unlike scattered TypeScript/Python refs on Coinbase x402 GitHub or thirdweb x402 GitHub, r402 delivers a modular Rust crate set with composable hooks, deferred settlement for streaming APIs (SSE/chunked), and MCP integration for x402 agentic payments in AI tools. Amid reports of Coinbase's x402 payments protocol seeing 10000 growth in transactions, Rust's memory safety shines for high-stakes payment servers, plus reqwest/axum middleware makes it drop-in for existing apps.

Who should use this?

Rust backend engineers building paid APIs or SaaS gateways on Base, Solana, or multi-chain setups. AI devs integrating x402 MCP GitHub for autonomous agent payments. Server owners needing x402 facilitator GitHub logic without Go/Python overhead.

Verdict

Grab it if you're in Rust and need x402 now—crates are on crates.io with solid docs.rs coverage, but 48 stars and 1.0% credibility score mean it's early; test thoroughly before prod. Pairs well with the companion facilitator repo for full stacks.

(198 words)

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