Your AI tools require an account.
Ours require an invoice.
The permissionless communication supercharger for humans and AI agents. Pay a few sats — AI makes your phone call in any language, reads a single sentence or a whole book aloud in 602 languages, translates across 119, sends your fax, transcribes your audio. No account. No subscription. No tracking. Works from any country.
For AI Agents & Developers
Drop one config line into your MCP client. Your agent gets AI phone calls in any language, audiobooks in 602 languages, translation, fax, transcription — callable via MCP or L402. A Lightning invoice is the only credential. No API key, no Stripe, no approval process.
{
"mcpServers": {
"sats4ai": {
"url": "https://sats4ai.com/api/mcp"
}
}
}For Humans
Pick a tool. Scan a Lightning QR. AI handles the work — your phone call in any language, your text read aloud, your document translated, your fax sent. Results back in seconds.
- AI phone calls (any language)varies
- Translate (119 languages)1 sat/1000 chars
- Audiobooks (602 languages)10-100 chars/sat
- Fax worldwidefrom 500 sats
+ 35 more tools below
Don't trust. Verify.
No accounts. Ever.
No login endpoint, no OAuth tokens, no sessions, no cookies. There is nothing to hack, revoke, or surveil. Every request is self-contained — like paying cash.
Payment is authentication.
HTTP status 402 — Payment Required. Your agent hits the endpoint, gets a Lightning invoice, pays it, gets the result. No API key to leak. No terms of service that change overnight.
Stateless architecture.
We don't store conversations, prompts, results, or usage patterns. Not because of a privacy policy — because the system is built with no state between requests.
Continuously audited.
Automated security scans on every deploy. Responsible disclosure policy with safe harbor for security researchers.
What sets us apart
Services you can't get anywhere else without an account, a credit card, and a subscription.
Make Phone Calls
Place calls to any phone number worldwide with sats. Deliver a spoken message or let an AI agent handle a two-way conversation — book a table, navigate an IVR, negotiate a bill. No account, no Twilio signup.
SMS Messaging
Send SMS to any phone number in any country. Pay per message with Lightning — no carrier account, no API key, no monthly plan.
Translation — 119 Languages
Translate text across 119 languages including low-resource languages like Yoruba, Marathi, Tagalog, and Swahili. 1 sat per 1000 characters. Privacy-preserving — no text stored.
Text-to-Speech — 602+ Languages
Convert text to realistic speech across 602+ languages. Three quality tiers: OmniVoice Global (602+ langs), Inworld Max Premium (#1 ELO), Minimax Studio (voice cloning). Emotion control, voice design.
AI Voice Calls
An AI agent calls a phone number on your behalf and has a two-way conversation. Booking, negotiation, IVR navigation. Returns a full transcript and structured analysis.
Send Email
Send a one-off email to anyone. No SMTP server, no domain verification, no account. 200 sats.
EPUB to Audiobook
Upload any EPUB and get a full AI-narrated audiobook with chapters (M4B). Optional translation to 40+ languages. Pay per character.
All Tools
40+ AI tools — pay per use with Lightning.
Image Generation
Generate images from text prompts. Multiple AI models available. Pay per image with sats.
Image Edit
Edit images with natural language. Add objects, remove elements, change styles, inpaint regions.
Background Removal
Remove image backgrounds instantly. Returns transparent PNG. 5 sats.
Image Upscale
2x or 4x neural super-resolution. Enhance low-res images with AI. 5 sats.
Face Restoration
Restore blurry, damaged, or AI-generated faces to photorealistic quality. 5 sats.
Colorize Photos
Colorize black-and-white photos with AI. 5 sats.
Object Detection
Detect and locate objects in images with bounding boxes. Open-set — describe any object. 5 sats.
Object Removal
Remove objects from images by description. No mask needed — just say what to erase. 15 sats.
NSFW Detection
Classify image safety. Returns confidence scores for content categories. 2 sats.
Video from Text
Generate cinematic video clips from text prompts. Physics-aware, with optional audio. Pay per second.
Video from Image
Animate any still image into a video clip. Describe the motion, pay with sats.
Text Generation
Chat with AI or generate content. Multiple model tiers — standard, better, best. Pay per message.
Music Generation
Create original songs with AI-composed music and vocals. Radio-quality MP3.
Voice Cloning
Clone any voice from a short audio sample. Get a reusable voice ID for text-to-speech.
Audio Transcription
Transcribe audio to text with timestamps and speaker diarization. 13 languages, up to 3 hours.
Vision / Image Analysis
Upload images and get AI analysis — captions, OCR, spatial reasoning, visual Q&A.
Document Extraction (OCR)
Extract text from PDFs, images, and documents as Markdown. Handles complex layouts, tables, handwriting.
Receipt OCR
Extract structured data from receipts and invoices. Returns JSON with merchant, items, totals.
Private Document Analysis
Analyze confidential documents with AI. Processed in memory only — nothing stored.
3D Model Generation
Convert photos to textured 3D GLB models with AI.
File Conversion
Convert between 200+ file formats. Documents, images, audio, video.
PDF Tools
Convert to/from PDF, merge multiple PDFs, convert HTML/Markdown to PDF.
HTML to PDF
Convert HTML or Markdown into a downloadable PDF document.
L402 API
Access all 40+ tools programmatically. HTTP 402 + Lightning invoice = the payment is the credential.
Vote on What We Build Next
See every live service and vote with 1 sat on what gets built next. Your Lightning payment is your ballot.
Featured In
Not sure where to start? Read real use cases and step-by-step guides.
Browse the blog →