Bitcoin Kayole

Posted on Feb 22

I built 98 AI microservices that accept Bitcoin Lightning — here's what I learned

#bitcoin #ai #api #opensource

Most AI tools today follow the same playbook: sign up, add a credit card, pick a subscription tier, hope you use it enough to justify the cost.

I wanted something different. The Ark is a collection of 98 AI services — each one a single API call, paid per-use with Bitcoin Lightning.

The stack

FastAPI backend
Lightning payments via Phoenix + LNbits
L402 protocol for machine-to-machine auth
SSL/TLS, rate limiting, input validation
SQLite for task persistence

The concept

Every service follows the same pattern:

POST /task
{
  "task_type": "code_review",
  "input_text": "your code here"
}

You get back a Lightning invoice. Pay it, and the result is delivered. Simple REST API, no SDK, no OAuth, no API keys.

Why per-task pricing works

SaaS subscriptions assume recurring usage. But most people don't need AI tools every day — they need a code review before a deploy, a privacy policy for a launch, a blog post for a campaign.

Per-task pricing at 100-500 sats (~$0.05-0.25) means you only pay for what you use. And because it's Lightning, there's no minimum transaction amount making micropayments impractical.

Workflow bundles

Single tasks are useful. Chained workflows are powerful.

Example — Full Code Audit bundle:

Code review → Security scan → Unit test generation
One payment, three outputs, discounted vs individual pricing

We have 6 workflow bundles covering code shipping, content creation, startup launch, and more.

L402: Machine-to-machine payments

This is the part I'm most excited about. Using the L402 protocol, other AI agents and automated systems can discover, pay for, and consume our services programmatically.

The OpenAPI spec is public. The machine discovery spec is at /.well-known/ai-agent.json. Any agent that speaks L402 can use The Ark without human intervention.

Global access

We're seeing interest from developers in regions where traditional payment infrastructure doesn't reach — parts of Africa, Latin America, Southeast Asia. No Stripe, no PayPal, no problem. Lightning wallets work on a $50 Android phone.

New features

💳 Day Passes — 24hr unlimited AI access (2,000 / 5,000 / 10,000 sats)
👥 Chama Groups — Pool sats with friends for shared AI access. First-of-its-kind cooperative AI model.
🌍 88-language translation — Including 16 African languages

Try it

First task is free:

curl -X POST https://thenode.it.com/free \
  -H "Content-Type: application/json" \
  -d '{ "task_type": "code_review", "input_text": "your code" }'

Full service list: thenode.it.com/market
API docs: thenode.it.com/openapi.json
Africa page: thenode.it.com/africa

Would love feedback from the dev community. What services would be most useful? What integrations would you want?

The Ark ⚡ — AI services, pay-per-task, Lightning-native.

DEV Community