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Prerequisites

  • A USDC wallet on Base (this is where you receive payments)
  • Your content served over HTTPS

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Step 1: Register

npx xenarch register
This creates your publisher account and returns an API key (xk_pub_...).

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Step 2: Add your site

npx xenarch site-add example.com
Returns a site token (st_...) and site ID. Save both.

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Step 3: Set pricing

npx xenarch pricing example.com --default 0.003
Sets a default price of $0.003 per page. Add path-specific rules: 
npx xenarch pricing example.com \
  --rule "/premium/*=0.01" \
  --rule "/api/*=0.05" \
  --rule "/public/*=0"

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Step 4: Install middleware

Choose your integration: 
pip install xenarch[fastapi]
Site-wide middleware (gates all bot traffic):
from xenarch.middleware import XenarchMiddleware

app.add_middleware(
    XenarchMiddleware,
    site_token="st_...",
    site_id="your-site-uuid",
    access_token_secret="your_secret",
    excluded_paths={"/healthz", "/docs"},
)
Per-route decorator (gates individual endpoints):
from xenarch.decorator import require_payment

gate = require_payment(
    site_token="st_...",
    site_id="your-site-uuid",
    access_token_secret="your_secret",
)

@app.get("/premium")
@gate
async def premium(request: Request):
    return {"content": "premium data"}
See the FastAPI middleware guide.

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Step 5: Add pay.json (optional)

Serve a pay.json file at /.well-known/pay.json so agents can discover your pricing without hitting a 402 first: 
npx pay-json-generate \
  --wallet 0xYOUR_WALLET \
  --receiver 0xC6D3a6B6fcCD6319432CDB72819cf317E88662ae \
  --price 0.003 \
  --provider xenarch \
  --output .well-known/pay.json
See the pay.json spec.

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How it works for your users

  • Humans: Pass through completely unaffected. The middleware only gates bot traffic.
  • AI agents with payment: Pay USDC, get an access token, access your content.
  • AI agents without payment: See HTTP 402 with payment instructions.

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Check your earnings

npx xenarch stats your-site-id