sats4ai-mcp

The permissionless communication supercharger for AI agents. 40+ tools paid with Bitcoin Lightning. No signup, no API keys, no KYC.

A remote MCP (Model Context Protocol) server that gives AI agents access to AI phone calls in any language, voice in 602 languages, translation across 119, fax, SMS, transcription, audiobooks, image generation, music, document extraction, and more — all paid per-use with Lightning Network micropayments.

Quick Setup

Claude Desktop

Add to your claude_desktop_config.json (~/Library/Application Support/Claude/claude_desktop_config.json on macOS, %APPDATA%\Claude\claude_desktop_config.json on Windows):

{
  "mcpServers": {
    "sats4ai": {
      "url": "https://sats4ai.com/api/mcp"
    }
  }
}

Claude Code

claude mcp add sats4ai --transport http https://sats4ai.com/api/mcp

Verify the connection: ask the agent "list the first 3 Sats4AI models" — it should call list_models and return results. For agents that pay invoices autonomously, also add a Lightning wallet MCP (see Payment via Agent Wallets).

Cursor

Settings → MCP → Edit Config, then add:

{
  "mcpServers": {
    "sats4ai": {
      "url": "https://sats4ai.com/api/mcp"
    }
  }
}

Restart Cursor. In a new chat, ask "what Sats4AI tools are available?" to confirm tool discovery. For autonomous payments, pair with a Lightning wallet MCP (see Payment via Agent Wallets).

Windsurf

Edit ~/.codeium/windsurf/mcp_config.json (create it if missing). Important: Windsurf uses serverUrl (not url) for remote HTTP MCP servers:

{
  "mcpServers": {
    "sats4ai": {
      "serverUrl": "https://sats4ai.com/api/mcp"
    }
  }
}

Restart Windsurf. Sats4AI tools appear in the Cascade tool list. Cascade has a 100-tool cap across all MCPs, so keep the active set lean. For autonomous payments, pair with a Lightning wallet MCP (see Payment via Agent Wallets).

stdio proxy (legacy MCP clients)

For clients that don't support remote HTTP servers, use the bundled stdio proxy:

npx sats4ai-mcp

Or in your config:

{
  "mcpServers": {
    "sats4ai": {
      "command": "npx",
      "args": ["sats4ai-mcp"]
    }
  }
}

Any MCP Client

The server URL is:

https://sats4ai.com/api/mcp

This is a remote HTTP server — no local process, no dependencies, no installation needed.

What Can It Do?

Once connected, just ask your agent. These prompts exercise the full flow — discover, pay the Lightning invoice, get the result:

• "Translate this paragraph to Spanish with Sats4AI — create the payment, pay the invoice with my lightning wallet, then run the translation."
• "Check what an SMS to +33612345678 costs, then send it: 'Your appointment is confirmed for 3pm tomorrow.'"
• "Generate an image of a lighthouse in a thunderstorm — pay the invoice and show me the result."
• "Send an AI voice agent to call +14155551234 and reschedule my dentist appointment, then give me the transcript."
• "Turn this EPUB into an audiobook — create the payment, then poll check_job_status until it's done."
• "Remove the background from this image."
• "Transcribe this audio file, then translate the transcript to English."
• "Get a quote for faxing this 3-page PDF to +4930123456, then send it."

Available Tools

AI Generation

Tool	Description	Price
image	Generate images from text prompts	100-200 sats
video	Generate videos from text prompts	50 sats/unit
video_from_image	Animate a still image into video	100 sats/sec
text	Chat with AI language models (262K context)	~1 sat/100 chars
translate_text	Translate text across 119 languages	~1 sat/1000 chars
music	Generate songs with AI vocals	100 sats
3d	Convert a photo to a 3D GLB model	350 sats

Audio & Speech

Tool	Description	Price
tts	Text to speech (467 voices, 29 languages)	300 sats
transcription	Speech to text (13 languages)	10 sats/min
voice_clone	Clone a voice from an audio sample	7,500 sats
epub_to_audiobook	Convert books (EPUB/PDF/TXT) to AI-narrated audiobooks	500+ sats

Image Processing

Tool	Description	Price
remove_background	Remove background from any image (BiRefNet, SOTA)	5 sats
upscale_image	Upscale images 2x/4x with Real-ESRGAN	5 sats
restore_face	Restore blurry/damaged faces (CodeFormer)	5 sats
colorize_image	Colorize B&W photos (DDColor, ICCV 2023)	5 sats
deblur_image	Remove camera-shake blur (NAFNet, ECCV 2022)	20 sats
detect_nsfw	Classify image safety (normal/suggestive/explicit)	2 sats
detect_objects	Detect objects with bounding boxes (Grounding DINO)	5 sats
remove_object	Remove objects by description — no mask needed	15 sats
image_edit	Edit images with AI instructions	Dynamic (varies by model) — check get_model_pricing

Vision & Documents

Tool	Description	Price
vision	Analyze and describe image content	21 sats
ocr	Extract text from PDFs and images	10 sats/page
extract_receipt	Receipt to structured JSON	50 sats
file_convert	Convert between 200+ file formats	100 sats
pdf_merge	Merge multiple PDFs into one	100 sats
convert_html_to_pdf	HTML/Markdown to PDF	50 sats

Communication

Tool	Description	Price
send_email	Send email to any address	200 sats
send_sms	Send SMS worldwide	Dynamic (varies by destination) — create_payment returns the exact quote
place_call	Place automated phone calls	Dynamic (varies by destination) — create_payment returns the exact quote
ai_call	Send an AI voice agent to make a two-way call	Dynamic (~150-250 sats/call) — create_payment returns the exact quote
send_fax	Send a fax worldwide (PDF URL or typed text)	500 sats (≤10 pages), +50 sats/page after
receive_fax	Open a 24h window to receive a fax, delivered to email	500 sats (+200 OCR add-on)

Helper Tools

Tool	Description
list_models	Browse available AI models and pricing
get_model_pricing	Get pricing for a specific model
create_payment	Create a Lightning invoice for a service
check_payment_status	Check if payment was received
check_job_status	Poll async jobs (video, 3D, audiobook)
get_job_result	Get completed job results
request_refund	Request a refund for a failed service
vote_on_service	Upvote or downvote a planned service
list_planned_services	See upcoming services and vote

How It Works

1. Agent calls list_models to discover available models and pricing
2. Agent calls create_payment — gets a Lightning invoice
3. Payment is made via the agent's Lightning wallet (e.g., lightning-wallet-mcp)
4. Agent calls the tool (e.g., image, text) with the paymentId
5. Result is returned — base64 image, text, URL, etc.

No API keys. No accounts. No rate limits tied to identity. Just Bitcoin and AI.

Error Handling & Refunds

When a paid tool fails after payment, the JSON-RPC error response includes refund information:

{
  "jsonrpc": "2.0",
  "id": 1,
  "error": {
    "code": -32603,
    "message": "Image generation failed",
    "data": {
      "refund": {
        "charge_id": 12345,
        "refund_amount": 200,
        "lnurl_withdraw": "lnurl1dp68gurn8ghj7..."
      }
    }
  }
}

Claim the refund using any LNURL-compatible wallet or the claim_lnurl_withdraw tool from lightning-wallet.

Errors also carry an error_code plus a recovery suggestion in error.data. Payment-lifecycle codes: PAYMENT_NOT_FOUND (wrong paymentId), PAYMENT_PENDING (invoice not paid yet), PAYMENT_ALREADY_USED (each payment covers one call). Full catalog: GET https://sats4ai.com/api/error-codes.

Payment via Agent Wallets

Pair with a Lightning wallet MCP server so your agent can pay autonomously:

{
  "mcpServers": {
    "sats4ai": {
      "url": "https://sats4ai.com/api/mcp"
    },
    "lightning-wallet": {
      "command": "npx",
      "args": ["lightning-wallet-mcp"]
    }
  }
}

The agent uses lightning-wallet to pay invoices from sats4ai, enabling fully autonomous AI tool usage.

L402 API

For direct HTTP integration without MCP, use the L402 API:

# Step 1: Request -> get 402 + Lightning invoice
curl -X POST https://sats4ai.com/api/l402/generate-image \
  -H "Content-Type: application/json" \
  -d '{"input": {"prompt": "a cat in space"}}' -i

# Step 2: Pay the invoice with any Lightning wallet

# Step 3: Re-send with proof
curl -X POST https://sats4ai.com/api/l402/generate-image \
  -H "Content-Type: application/json" \
  -H "Authorization: L402 <macaroon>:<preimage>" \
  -d '{"input": {"prompt": "a cat in space"}}'

Or skip the manual steps entirely: our L402 endpoints speak the standard L402 protocol, so lnget — Lightning Labs' own L402 client — pays them automatically. Point it at your Lightning node and call the endpoint:

lnget -X POST -d '{"text": "Hello", "targetLanguage": "Spanish"}' \
  --content-type application/json --max-cost 50 \
  https://sats4ai.com/api/l402/translate-text
# Fetches the 402, pays the invoice, retries, prints the result.

Full L402 docs: sats4ai.com/l402 | Code examples: sats4ai-l402-examples

Service Discovery

Machine-readable endpoints for agent discovery:

# Full service catalog with pricing, quality benchmarks, and performance metadata
GET https://sats4ai.com/.well-known/l402-services

# MCP tool catalog with latency (p50/p95), reliability, and failure modes
GET https://sats4ai.com/api/mcp/discovery

# Semantic search — find tools by capability
GET https://sats4ai.com/api/discover?q=translate

# Per-service metadata with enums and input schemas
GET https://sats4ai.com/api/l402/{service}

Every paid tool includes performance metadata (latency p50/p95, reliability rating, known failure modes) so agents can make informed decisions about which tools to call and how long to wait.

Programmatic Usage

const { SERVER_URL, TOOLS, getClaudeConfig } = require("sats4ai-mcp");

console.log(SERVER_URL);       // "https://sats4ai.com/api/mcp"
console.log(TOOLS);            // ["image", "video", "text", ...]
console.log(getClaudeConfig()) // { mcpServers: { sats4ai: { url: "..." } } }

Security

Found a vulnerability? Do not open a public issue. Email sats4ai@gmail.com. See SECURITY.md for full disclosure policy and scope.

Links

• Website: sats4ai.com
• MCP Docs: sats4ai.com/mcp
• L402 API Docs: sats4ai.com/l402
• L402 Code Examples: github.com/cnghockey/sats4ai-l402-examples
• Service Discovery: sats4ai.com/.well-known/l402-services
• Semantic Search: sats4ai.com/api/discover
• Security Policy: SECURITY.md

License

MIT