A few weeks ago we shared the initial build of The Ark — a pay-per-task AI service powered by Lightning. The feedback from this community was incredible and pushed us to go way further than planned. Here's where we are now.

The Stack

Nothing fancy, just stuff that works:

1. Phoenixd (JVM) — our Lightning node. Zero channel management headaches. It just works.
2. LNbits — invoice generation + payment tracking
3. FastAPI — API layer serving all 114 services
4. Nginx — SSL termination,

From 7 Services to 114
The original build had 7 tasks: summarize, translate, codegen, research, content, write, data_analyze, image_describe.

Now we're at 114:

Dev tools (20+): code review, bug finder, unit test gen, Dockerfile gen, CI/CD gen,
regex gen, SQL from English, API design, k8s manifests, terraform gen
Content & SEO (15+): blog writing, SEO analysis, keyword research, competitor
analysis, ad copy, social posts, hashtag gen
Business (12+): pitch decks, invoices, privacy policies, terms of service, meeting
summaries, SOWs, contracts
Professional (28): legal drafts, medical summaries, financial reports, education tools,
real estate analysis
Productivity (16): email drafts, spreadsheet analysis, resume review, presentation
outlines, data visualization
Creative: voice generation, image generation
Every single one is pay-per-task via Lightning. No accounts. No API keys. No KYC.

L402 Support

With Lightning Labs releasing their agent tools last week, this is worth highlighting — we have a working L402 endpoint:

https://arknode.ai/l402/task

Returns a 402 with Lightning invoice. Pay it, get your result. Any L402-compatible client (including the new lnget tool) can interact with our API programmatically.
The machine-to-machine discovery spec is at:
https://arknode.ai/.well-known/ai-agent.json
So any AI agent that knows how to pay Lightning invoices can autonomously use our 114
services. Agent-to-agent commerce isn't theoretical anymore — it's running in
production.

Workflow Bundles

Single tasks are great, but real work usually needs a chain. We built 6 workflow bundles:

1. full code audit (1,200 sats): code review → security scan → unit tests
2. launch_pack (1,500 sats): landing copy → SEO → social posts → ads
3. code_ship (2,000 sats): review → docs → tests → changelog → Dockerfile
4. content_machine (2,200 sats): blog → SEO → social → email → hashtags
   Each bundle is cheaper than running the tasks individually. One POST, one invoice, all
   steps execute in sequence.

What's Working / What's Not

Working: - Phoenixd has been rock solid. Zero downtime since launch. - QR code
payment flow — scan, pay, get result in under 10 seconds - Free first task converts well— people try it and come back - African users specifically — no credit card barrier is a real unlock

Not working yet: - Discovery. People can't pay for what they can't find- Twitter API
costs $200/mo for posting access (lol) - Day passes need more marketing — unlimited AI for 10K sats/day is a steal but nobody knows about it

What's Next

1. PWA installed — arknode.ai works as a mobile app (Add to Home Screen)
2. Deploy service — we'll set up this entire stack for your business for 500K sats
   (~$485). Your domain, your server, your data. 24 hours.
3. Chama AI — group wallets where teams pool sats and share AI access (built for
   African savings groups but works for any team)

Try It here:

→ https://arknode.ai

API docs: https://arknode.ai/openapi.json

Machine discovery: https://arknode.ai/.well-known/ai-agent.json

Building in public. Running on Lightning.