satgate 0.3.1

Python SDK for SatGate - Automatic L402 payments for AI Agents. The Stripe Moment.

SatGate Python SDK

Give your AI agents a Lightning wallet in 2 lines of code.

Automatic L402 payment handling — the "Stripe Moment" for autonomous agents.

Installation

pip install satgate

Quick Start

from satgate import SatGateClient, LNBitsWallet

# 1. Connect your wallet
wallet = LNBitsWallet(
    url="https://legend.lnbits.com",
    admin_key="your-admin-key"
)

# 2. Create client
client = SatGateClient(wallet)

# 3. That's it. 402 → Pay → Retry happens automatically.
response = client.get("https://api.example.com/premium/data")
print(response.json())

What Happens Under the Hood

1. GET /premium/data
   ↓
2. Server returns 402 + Lightning Invoice
   ↓
3. SDK automatically pays invoice
   ↓
4. SDK retries with L402 token
   ↓
5. You get the response ✓

Wallet Options

LNBits

from satgate import LNBitsWallet

wallet = LNBitsWallet(
    url="https://legend.lnbits.com",  # or your own instance
    admin_key="your-admin-key"
)

Alby

from satgate import AlbyWallet

wallet = AlbyWallet(access_token="your-alby-token")

Custom Wallet

Implement the LightningWallet interface:

from satgate import LightningWallet

class MyWallet(LightningWallet):
    def pay_invoice(self, invoice: str) -> str:
        # Connect to your LND, CLN, etc.
        preimage = my_node.pay(invoice)
        return preimage  # hex string

Features

Token Caching

Tokens are cached by default to avoid paying twice:

client = SatGateClient(wallet, cache_tokens=True, cache_ttl=3600)

# First call: pays invoice
client.get("/premium")

# Second call: uses cached token (no payment)
client.get("/premium")

Payment Callbacks

Track payments in real-time:

def on_payment(info):
    print(f"Paid {info.amount_sats} sats for {info.endpoint}")
    # Log to your analytics, update UI, etc.

client = SatGateClient(wallet, on_payment=on_payment)

Session Tracking

client = SatGateClient(wallet)

# Make some requests...
client.get("/endpoint1")
client.get("/endpoint2")

print(f"Total spent: {client.total_paid_sats} sats")

Quiet Mode

Disable console output:

client = SatGateClient(wallet, verbose=False)

LangChain Integration

SatGate includes a ready-to-use LangChain tool for AI agents.

Installation

pip install satgate langchain langchain-openai

Basic Usage

from satgate import SatGateTool, LNBitsWallet
from langchain.agents import initialize_agent, AgentType
from langchain_openai import ChatOpenAI

# 1. Configure wallet
wallet = LNBitsWallet(
    url="https://legend.lnbits.com",
    admin_key="your-admin-key"
)

# 2. Create the tool
satgate_tool = SatGateTool(wallet=wallet)

# 3. Build agent
llm = ChatOpenAI(model="gpt-4", temperature=0)
agent = initialize_agent(
    tools=[satgate_tool],
    llm=llm,
    agent=AgentType.OPENAI_FUNCTIONS,
    verbose=True
)

# 4. Let it pay for premium data
result = agent.run("Fetch the premium market analysis from the paid API at https://api.example.com/premium/report")

How It Works

The SatGateTool gives your AI agent the ability to:

1. Access any L402-protected API
2. Automatically pay Lightning invoices
3. Cache tokens for repeated access
4. Handle the entire 402 → Pay → Retry flow

Tool Description (for the LLM)

Tool: satgate_api_browser
Description: Useful for fetching data from paid/premium APIs that require 
Lightning Network payments. Use this tool when you need to access high-value 
data, reports, or analytics that are behind a paywall. The tool handles 
payment automatically.

Input: The full URL of the premium API endpoint to fetch data from.

Example Agent Prompt

agent.run("""
You are a financial analyst assistant. 
Use the satgate_api_browser tool to fetch premium market data.
Then summarize the key insights.
""")

Error Handling

from satgate import PaymentError, L402ParseError

try:
    response = client.get("/premium")
except PaymentError as e:
    print(f"Payment failed: {e}")
except L402ParseError as e:
    print(f"Invalid L402 response: {e}")

API Reference

SatGateClient / SatGateSession

SatGateClient(
    wallet: LightningWallet,      # Required: wallet for payments
    cache_tokens: bool = True,    # Cache L402 tokens
    cache_ttl: int = 3600,        # Cache TTL in seconds
    on_payment: Callable = None,  # Payment callback
    verbose: bool = True          # Print progress
)

PaymentInfo

@dataclass
class PaymentInfo:
    invoice: str           # BOLT11 invoice
    preimage: str          # Payment proof
    macaroon: str          # L402 macaroon
    amount_sats: int       # Amount paid
    endpoint: str          # URL accessed
    timestamp: float       # Unix timestamp

License

MIT