moltspay 0.2.1

Python SDK for MoltsPay - Agent-to-Agent Payments. LangChain compatible.

MoltsPay Python SDK

Python SDK for MoltsPay - Agent-to-Agent Payments.

Installation

pip install moltspay

Quick Start

from moltspay import MoltsPay

# Initialize (auto-creates wallet if not exists)
client = MoltsPay()
print(f"Wallet address: {client.address}")

# Discover services
services = client.discover("https://juai8.com/zen7")
for svc in services:
    print(f"{svc.id}: {svc.price} {svc.currency}")

# Pay for a service
result = client.pay(
    "https://juai8.com/zen7",
    "text-to-video",
    prompt="a cat dancing on the beach"
)
print(result.result)

Features

• Auto wallet management - Creates wallet on first run, compatible with Node.js CLI
• Spending limits - Set per-transaction and daily limits
• x402 protocol - Native support for HTTP 402 payment flow
• Gasless payments - Uses EIP-2612 permits, no ETH needed for clients
• LangChain integration - Use as a tool in LangChain agents

Wallet Management

from moltspay import MoltsPay

# Wallet auto-created at ~/.moltspay/wallet.json
client = MoltsPay()

# Check limits
limits = client.limits()
print(f"Max per tx: {limits.max_per_tx}")
print(f"Spent today: {limits.spent_today}")

# Update limits
client.set_limits(max_per_tx=20, max_per_day=200)

Async Support

import asyncio
from moltspay import AsyncMoltsPay

async def main():
    async with AsyncMoltsPay() as client:
        result = await client.pay(
            "https://juai8.com/zen7",
            "text-to-video",
            prompt="a cat dancing"
        )
        print(result.result)

asyncio.run(main())

Error Handling

from moltspay import MoltsPay, InsufficientFunds, LimitExceeded, PaymentError

client = MoltsPay()

try:
    result = client.pay(...)
except InsufficientFunds as e:
    print(f"Need {e.required} USDC, have {e.balance}")
except LimitExceeded as e:
    print(f"Exceeds {e.limit_type} limit: {e.amount} > {e.limit}")
except PaymentError as e:
    print(f"Payment failed: {e}")

LangChain Integration

Use MoltsPay as a tool in your LangChain agents:

pip install moltspay[langchain]

from langchain.agents import initialize_agent, AgentType
from langchain_openai import ChatOpenAI
from moltspay.integrations.langchain import MoltsPayTool

llm = ChatOpenAI(model="gpt-4")
tools = [MoltsPayTool()]

agent = initialize_agent(
    tools, 
    llm, 
    agent=AgentType.OPENAI_FUNCTIONS,
    verbose=True
)

# Agent can now pay for AI services!
result = agent.run("Generate a video of a cat dancing on the beach")

Two tools available:

• MoltsPayTool - Pay for and execute services
• MoltsPayDiscoverTool - Discover available services and prices

from moltspay.integrations.langchain import get_moltspay_tools

tools = get_moltspay_tools()  # Returns both tools

CLI Compatibility

Wallet format is compatible with Node.js CLI:

# Create wallet with Node CLI
npx moltspay init --chain base

# Use same wallet in Python
python -c "from moltspay import MoltsPay; print(MoltsPay().address)"

Links

• Docs: https://moltspay.com
• NPM (Node.js): https://npmjs.com/package/moltspay
• GitHub: https://github.com/Yaqing2023/moltspay-python

License

MIT