x402-polkadot
x402 HTTP payment protocol implementation for the Polkadot/Substrate ecosystem — enabling pay-per-request API monetization with on-chain settlement.
In the AI payments ecosystem
x402-polkadot is an early-stage Rust project in the AI payments / x402 ecosystem, focused on blockchain, payments, polkadot, rust. It currently has 0 GitHub stars and 0 forks, and sits alongside related tools like x402-payments-mcp, x402-solana-rust, tempo-x402, afara, dna-x402, piprail.
x402 Polkadot Payment System (Demo)
A demo implementation of the x402 payment protocol for Polkadot.
Payment Flow
sequenceDiagram
participant Client
participant Server
participant Facilitator
participant Polkadot
Client->>Server: GET /api/paid
Server->>Client: 402 Payment Required
Note over Client: Auto-signs transaction
Client->>Server: GET /api/paid + X-PAYMENT header
Server->>Facilitator: POST /verify
Facilitator->>Server: {valid: true}
Server->>Facilitator: POST /settle
Facilitator->>Polkadot: Submit transaction
Polkadot->>Facilitator: Confirmed
Facilitator->>Server: {settled: true, tx_hash}
Server->>Client: 200 OK {protected content}
Live Demo
| Service | URL |
|---|---|
| Client | https://x402-client.fly.dev |
| Server | https://server-bold-dream-4447.fly.dev |
| Facilitator | https://facilitator.fly.dev |
Quick Start
Prerequisites
- Rust 1.70+
- Node.js 18+
- Wallet mnemonic (12-word phrase)
- Paseo testnet tokens from Faucet
1. Start Facilitator
cd facilitator
cp .env.example .env
cargo run
2. Start Server
cd server
cp .env.example .env
cargo run
3. Start Client
cd client
cp .env.example .env
npm install && npm run dev
4. Test Payment Flow
- Open
http://localhost:5173 - Click "Load Wallet from .env"
- Click "Test /api/paid"
- Watch the payment flow complete automatically
Project Structure
x402-polkadot/
├── client/ # Frontend (Vite + JS)
├── server/ # API server (Rust + Axum)
├── facilitator/ # Transaction service (Rust + Subxt)
Resources
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