How to Chat with AI Using Bitcoin Lightning
Top-tier models. No account. No subscription. Pay per message with a Lightning wallet.
For Humans
Use the web UI — no setup required.
Every AI chat service wants your email, your credit card, and a monthly commitment before you can send a single message. Sats4AI skips all of that. Type a message, pay a Lightning invoice, get an answer. Works from any browser. Nothing stored, nothing tied to your identity.
Quick research without a subscription
Need a top-tier model for one task? Send a few messages, pay a few sats, walk away. No plan to cancel, no trial period to remember.
Private conversations by default
No account means no conversation history linked to you. Useful for sensitive topics, competitive research, or simply not wanting to feed a training dataset.
Coding help with the best models
Free tiers give you weak models with rate limits. Sats4AI gives you access to models built for deep reasoning and code — at pennies per message, not $20/month.
Images and files too
Attach a screenshot, a PDF, or an image to your message. Ask the model to explain, summarize, or act on it — all included in the same pay-per-message flow.
Available Models
Kimi K2.5
Rivals the best proprietary models. Advanced reasoning, thinking mode, code generation, image understanding, and file analysis. Ideal for complex tasks that demand intelligence.
GPT-OSS
117B open-weight reasoning model with ultra-fast inference. No cold starts, instant responses. Perfect for quick answers, code generation, writing, and everyday tasks where speed matters.
For Agents
Integrate via L402, MCP, or OpenClaw — no account, no API key.
The text generation endpoint supports L402 authentication: your agent or script pays per message with a Lightning micropayment. No API key to manage, no billing account to set up, no monthly minimum. The model processes the message and returns a streamed response — same models, same quality, fully automated.
Automated content pipelines
A script fetches a topic, calls the text generation API to draft it, then passes the output to TTS or email delivery — each step paid independently via Lightning.
AI coding assistant for your agent
Power an OpenClaw or MCP-connected coding agent with Kimi K2.5 — 1T parameter reasoning for code review, debugging, and generation at a fraction of subscription costs.
Document and data analysis
An agent uploads a PDF or CSV and asks the model to extract, summarize, or classify the contents. File support included in every message — no extra setup.
Multi-step reasoning chains
Chain multiple calls: analyze an image with Vision, feed the description to text generation for a report, then send the report by email — all in one automated workflow.
L402 Authentication Flow
Send the request without auth
POST your message and model choice to the endpoint. The server responds with HTTP 402 + a Lightning invoice in the WWW-Authenticate header.
Pay the Lightning invoice
Your agent pays the invoice using a Lightning wallet or library. Save the preimage from the payment result.
Resend with the preimage
Repeat the identical request, adding an Authorization: L402 <macaroon>:<preimage> header. The server validates and returns the AI response.
# One command — lnget handles invoice, payment, and retry automatically
lnget -X POST https://sats4ai.com/api/l402/generate-text \
--json '{"input":[{"role":"User","content":"Explain Bitcoin in one sentence"}]}'Connect any MCP-compatible AI assistant. Text generation is one of 10+ tools available through a single connection.
View MCP docs →One-line MCP setup. Your agent pays automatically with Lightning — no API key, no billing account.
Setup OpenClaw →How Much Does It Actually Cost?
Sats4AI charges per message based on token length. Compare that to flat monthly subscriptions:
| Usage | Premium AI Subscriptions | Sats4AI (Kimi K2.5) |
|---|---|---|
| Light (100 msgs/mo) | $20/mo minimum | ~1,500 sats (~$0.60) |
| Medium (500 msgs/mo) | $20–100/mo | ~7,500 sats (~$3) |
| Heavy (2,000 msgs/mo) | $100–200/mo | ~30,000 sats (~$12) |
| Signup required | Account + email + credit card | None |
Bottom line: 500 messages/month to a top-tier model costs ~$3 on Sats4AI vs. $20–200 on premium subscriptions. That's up to 60x cheaper, and you never pay for a month you don't use. Prices scale with message length; web search adds +2 sats.
Chain with Other Services
Try It Now — No Signup Required
Top-tier AI from 1 sat per message. All you need is a Lightning wallet.