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Your Agent's Favorite Tools
Phone calls, SMS, fax, translation, voice, images, video — 40+ tools your AI can actually use. No account. Paid in Bitcoin.
$ curl -X POST https://sats4ai.com/api/l402/translate-text \
-d '{"text":"Hello world","targetLanguage":"es"}'
# 402 Payment Required + Lightning invoice (1 sat)
# pay it, retry with the L402 auth header
$ # → {"translatedText":"Hola mundo"}Authorized by payment, not by account. No reusable account credential to revoke or leak.
Pick a tool. There is no account to create.
Scan the Lightning QR — or your agent pays the L402 invoice.
Get the result. There is no account-linked history or behavioral profile.
What it takes to start
Friction, not brands. Nothing here names a company, so nothing here can go stale or be argued with.
What we need from youOne paid invoice. That is the entire list.
What we actually sell
Outcomes
Finished results, not parts — each one holds state you would otherwise hold, runs in real time, or needs a credential you cannot get on your own. A few examples:
Audiobooks
Upload an EPUB or PDF, pick the chapters worth hearing, get a finished M4B with real chapter marks and cover art. 602 languages, translated first if you need it, narrated in your own cloned voice if you want.
Subtitles, any file
Drop in any audio or video, up to a full-length movie. We detect the language, return a timestamped .srt or .vtt, and translate it only if you ask.
AI Voice Calls
Send an agent to make the call you are dreading — book the table, chase the refund, sit through the phone menu. You get the transcript after.
Send a Fax
The bank or the notary still wants a fax. Send one anywhere in the world from your browser — give us a PDF or just type the text and we build it, cover page included.
Boarding Passes
Airline PDF or screenshot in, real Google Wallet pass out — gate, zone and boarding time on your lock screen. Whole family in one upload.
Building blocks
One capability, one call. Compose them yourself, or hand your agent the catalog and let it do the composing. A few examples:
SMS
Text anyone from a number that is not yours — no SIM, no sender account, nothing tied back to you.
Translation
A lease, a contract, a message — into 452 languages, including 251 no frontier model will touch.
Text to Speech
A shop ad in Yoruba, a voiceover for one video, a page read aloud. 602 languages, or a clone of your own voice.
Video from Text
One clip for your shop, one scene for a pitch. Described in a sentence, generated with sound, paid for once.
Voice Cloning
One short recording becomes a voice you can reuse — even in languages you do not speak.
3D Models
A photo or a sketch becomes a textured 3D model — for a game, a shop page, or your printer.
Everything we sell
The full catalog, grouped. Pay per use, no account, no subscription.
Communication
6Make Phone Calls
Call countries your plan doesn't cover, skip roaming fees abroad, or call back a suspected spammer — from a number that isn't yours.
SMS Messaging
Send a text from your browser with no sender account, SIM, or sender phone number. Telecom and abuse-screening providers process the destination and message.
AI Voice Calls
Send an AI agent to make the call — book a table, chase a refund, navigate the phone menu — and read the transcript after.
Send Email
Send a one-off notice without a sender account — 200 sats. Mail and abuse-screening providers process the addresses and message.
Send a Fax
Your bank, a court, or a landlord still wants a fax — send it from your browser, catch the reply for 24 hours.
Translated Calls (Experimental)
Early Voice Bridge preview. We are still testing latency and reliability. Do not use it for important calls.
Audio & Voice
5Text-to-Speech — 602+ Languages
A voice ad in Yoruba or a one-off voiceover — 602 languages, pay per use, no account.
EPUB to Audiobook
Turn an EPUB or PDF into a chaptered audiobook — in any of 602 languages, even narrated in your own cloned voice.
Music Generation
A full song with vocals for your video, or a custom birthday song — up to six minutes, 500 sats.
Voice Cloning
Clone your voice from one short recording — then narrate audiobooks or videos in it, even in other languages.
Audio Transcription
Turn a meeting, interview, or voice note into text with speaker labels and timestamps — pay per minute, no account.
Image
11Image Generation
Product shots for your WhatsApp shop or art for a client deck — pay per image without an account. The selected image provider processes your prompt under its own policy.
Image Edit
Remove a background, erase a photobomber, or restore and colorize an old photo — the latest editing models, no account.
Background Removal
Product photo on white in one click — background gone, transparent PNG back. 44 sats.
Image Upscale
Enlarge a small photo 2x or 4x without the blur — 5 sats.
Face Restoration
Fix the blurry face in an old or AI-generated photo — 25 sats.
Colorize Photos
Bring old black-and-white family photos to life — 5 sats.
Object Detection
Find and box every object in an image — names, positions, confidence. 5 sats.
Object Removal
Erase the photobomber or the watermark — describe it, it's gone. 130 sats.
NSFW Detection
Check an image is safe before you publish it — 2 sats.
Vision / Image Analysis
Screenshot a chart, an error, or a sign in another language — ask questions, get plain answers.
3D Model Generation
Turn a product photo or sketch into a 3D model — for your game, your shop page, or your printer.
Video
4Video from Text
One ad clip for your shop, one scene for a pitch — generated from text, paid once, no subscription.
Video from Image
Make your product photo move, or bring an old family photo to life — one still becomes a short clip.
Video Subtitles
Subtitle a video of any length without uploading it — the video never leaves your device.
Music Video
Give it a track and it cuts the shots to the beat — pay per shot, keep the ones that land.
Documents & Text
10Translation — 452 Languages
Translate a lease or a contract — 452 languages, including 251 no frontier model serves. Quality tier shown before you pay.
Text Generation
Hit your AI chat limit mid-deadline, or use chat without account-linked Sats4AI history. The selected model provider processes your messages under its own policy.
Document Extraction (OCR)
A scanned contract, handwriting, or tables — back as clean text ready for any AI, 10 sats a page.
Receipt OCR
Snap a crumpled receipt — get merchant, items, totals, and tax as clean data for your books.
No-Account Document Analysis
Ask AI about a contract, an NDA, or a medical file. The original file stays in your browser; extracted text and questions go to the selected model provider.
File Conversion
PDF to DOCX, MP4 to MP3, 200+ formats — convert one file without signing up for an ad-farm site.
PDF Tools
Turn a locked PDF back into Word, Markdown, or plain text — or merge scans into one file for the visa office.
HTML to PDF
Turn a Markdown invoice or an HTML page into a clean PDF — 50 sats, no account.
E-Signature
Get a document signed without either side opening an account. Up to 3 signers.
Boarding Pass to Wallet
Airline PDF or screenshot in, real Google Wallet pass out — gate, zone and boarding time on your lock screen.
For AI Agents & Developers
Drop one config line into your MCP client. Your agent gets AI phone calls, 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. An agent makes your call, a voice reads your text, or a service translates your document or sends your fax. Get the result without creating an account.
- AI phone callsfrom ~200 sats/min
- Translate (452 languages)1 sat/1000 chars
- Audiobooks (602 languages)~7-90 chars/sat
- Fax worldwidefrom 500 sats
See all tools above
Why there is no account
Most accounts use an email address or phone number as the key that owns your history. We collect neither as a registration identity. Your payment authorizes one action; operational records stay with that transaction, not a customer profile. The six-layer argument, who builds this, and how we make money — all on one page.
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.
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