Private AI Document Analysis
Get AI insights on your most sensitive documents without creating an account, without uploading to a cloud, and without leaving a trace. Pay with Bitcoin Lightning.
The problem with mainstream AI document tools
ChatGPT, Claude, Gemini — every major AI document tool requires you to create an account before you can upload a file. That account ties your documents to your identity: your email, your IP, your history.
Most services retain your documents, use them to train models, or store them in data centers subject to subpoenas and breaches. For routine documents, fine. For anything sensitive — that's a real risk.
For Humans
Documents that don't belong in Big Tech's servers. Here's what people actually use this for:
Contracts & NDAs
Employment agreements, vendor contracts, non-disclosure agreements, term sheets. Extract key clauses, flag obligations, compare versions — without that document being logged against your identity.
Financial Records
Tax returns, bank statements, audit reports, balance sheets. Personal or corporate financial data is among the most sensitive information that exists — it shouldn't live in a third-party cloud indefinitely.
Medical & Health Files
Lab results, clinical notes, insurance claims, prescription records. Health data is deeply personal and heavily regulated. Here it's processed in memory and gone the moment your session ends.
Legal Documents
Court filings, settlement agreements, regulatory correspondence, compliance reports. Anything in an active legal matter — or covered by privilege — shouldn't go through an account tied to your name.
Confidential Business Docs
Board presentations, M&A documents, product roadmaps, competitive intelligence. Internal strategy is your company's most valuable asset — analyze it without exposing it to a third-party platform.
HR & People Data
Performance reviews, salary records, severance agreements. Employee data is regulated by GDPR, CCPA, and other laws. Processing it privately protects both the company and its people.
For Agents
Automate document workflows without building infrastructure or paying for enterprise AI subscriptions. Each query is a single L402 payment — no API key, no rate limits tied to an account.
Automated contract review
Agent pulls a new vendor contract, extracts key terms, flags non-standard clauses, and posts a summary to Slack — no human reads it first.
Regulatory monitoring
Agent fetches new compliance documents from a regulatory body, extracts changes relevant to your industry, and alerts you via SMS.
Invoice processing
Extract line items, totals, and vendor details from PDF invoices. Structured output feeds directly into an accounting pipeline.
Research synthesis
Agent reads 10 research papers, extracts key findings, and produces a comparative summary — paying per document, not per month.
L402 API call — analyze a document programmatically:
# Step 1 — send without auth, get invoice
curl -s -X POST https://sats4ai.com/api/models/text-generation \
-H "Content-Type: application/json" \
-d '{
"model": "kimi-k2.5",
"messages": [{"role":"user","content":"Summarize key obligations in this contract: [text]"}]
}'
# → 402 Payment Required + Lightning invoice
# Step 2 — pay the invoice (any Lightning wallet)
# Step 3 — resend with preimage
curl -X POST https://sats4ai.com/api/models/text-generation \
-H "Content-Type: application/json" \
-H "Authorization: L402 <token>:<preimage>" \
-d '{ ... same body ... }'
# → { "content": "Key obligations: ..." }262K context window — paste the full document text in the message body.
How It Works
Open the tool — no login required
Go to sats4ai.com/private-document-analysis. No account, no email, no signup.
Upload your document
Select your file. Text is extracted in your browser — nothing leaves your device at this stage.
Ask your question
Type what you need: a summary, specific clauses, a comparison, a risk assessment. The model holds the full document in context.
Pay the Lightning invoice
A QR code appears. Scan it with any Lightning wallet. Price starts at 15 sats and scales with document and message length.
Continue the conversation
Ask follow-up questions without re-uploading. The document stays in session context until you start a new analysis.
What you can ask
- ✓Summarize a 100-page contract and extract key obligations, deadlines, and risks
- ✓Ask follow-up questions about specific clauses without re-uploading
- ✓Compare two versions of an agreement to identify what changed
- ✓Extract all financial figures from a PDF report into a structured list
- ✓Identify compliance gaps in an internal policy against a regulatory standard
- ✓Translate technical legal or financial language into plain English
- ✓Analyze code files or technical specifications for bugs or architecture issues
- ✓Review a large CSV or XLSX dataset and ask statistical or trend questions
Supported file types
Up to 200,000 characters per document. For scanned PDFs without selectable text, run OCR first.
Why Lightning payments protect your privacy
The L402 protocol means there is no user account to log your payment against. A Lightning invoice is issued per request, paid, and forgotten.
- 1. You send a request → server issues a Lightning invoice
- 2. You pay the invoice from any wallet
- 3. You resend with the payment proof → get your result
No credit card, no bank, no payment processor that links the transaction to your name.
Combine with other tools
Scanned or image-based PDFs have no selectable text. Run OCR first, then feed the extracted text into document analysis.
Convert a locked or read-only PDF to Markdown, then analyze the clean text. Or merge multiple PDFs before running analysis on the full document set.
Get the AI summary, then convert it to audio — listen to your document analysis while commuting, without reading a screen.
Agent extracts key findings from a document and sends a summary SMS — useful for automated contract monitoring or regulatory alerts.
Our position on privacy
We don't run an advertising business. We don't sell data. We don't build user profiles. Our business model is simple: you pay sats for AI compute, we provide the service, the transaction ends there.
We want your sats a lot more than your personal data.
No account means we genuinely don't know who you are. No document storage means there's nothing to leak, sell, or hand over. That's not a policy — it's how the system is built.
Analyze Your Document — No Account Needed
Upload a file, ask a question, pay with Lightning. Zero retention, zero trace.