Generate QR codes via x402 — the simplest possible pay-per-request example.
A tiny example that takes any text or URL and returns a QR code. The cheapest x402 capability — usually under $0.001 per call.
Why this exists: QR code generation is a 1-line task that every paid API somehow turns into signup, account, dashboard, key. Pay a fraction of a cent and skip the whole thing.
claude mcp add entroute -- npx @entroute/mcp-serverThen ask Claude: "Generate a QR code for https://entroute.com" — it discovers a verified QR endpoint, pays in USDC on Base, and returns the image. No API keys, no wallet setup, no env vars.
npm install @entroute/sdk-agent-tsInspect the top-ranked endpoint:
import { EntRouteClient } from '@entroute/sdk-agent-ts';
const client = new EntRouteClient({ baseUrl: 'https://api.entroute.com' });
const result = await client.discover({ capability_id: 'qr.generate' });
console.log(result.ranked_endpoints[0]);To actually call it (and have the SDK handle the x402 402 → pay → retry dance), pass a Base wallet via client.discoverAndCall(). See the SDK docs.
Discovery only — prints the top 3 endpoints with score, latency, success rate, and price. No payment, no wallet needed.
git clone https://github.com/entroute/qr-generator && cd qr-generator
pnpm install
pnpm startSource: src/index.ts.
The only x402 directory that pays real USDC to verify each endpoint actually works. Probes run every 10 minutes; failed endpoints get demoted automatically.
- Site: https://entroute.com • Docs: https://entroute.com/docs/quickstart
- MCP server:
@entroute/mcp-server - TypeScript SDK:
@entroute/sdk-agent-ts
x402 is the open pay-per-request protocol behind it (Coinbase + Linux Foundation). Server returns 402, client pays in USDC on Base, retries with payment header.
get-crypto-prices— Token prices without CoinGeckofetch-tweets— Twitter data without the Twitter APIweb-search-agent— Web search for AI agentssummarize-url— Summarize any article URLdescribe-image— Image alt-text + understandingget-weather— Weather without sign-upplace-search— Find places nearby without Google Places
MIT