ln-church-agent 0.4.1

A Python reference client for HTTP 402 settlement across x402, L402, and fallback flows.

ln-church-agent

A Python reference client abstraction for HTTP 402 (Payment Required) settlement, built for Autonomous AI Agents.

Implementing machine-to-machine (M2M) payments from scratch is painful and highly prone to cryptographic hallucinations during an AI agent's reasoning loop. ln-church-agent abstracts the entire "Settlement Negotiation" process triggered by HTTP 402 errors, allowing agents to seamlessly pay for APIs, oracles, and services without manual intervention.

Fully compatible with Lightning Labs' L402 protocol standards, uniquely extended with EVM cross-chain support (x402) and Zero-Balance Faucets.

🧩 What it abstracts

This SDK natively handles the "Payment-Retry Loop" so your agent doesn't have to:

• x402 (EVM Gasless): Autonomous EIP-712/EIP-3009 signing and relayer orchestration.
• L402 (Lightning Network): Macaroon extraction, Bolt11 parsing, preimage submission, and multi-provider wallet support (LNBits, Alby).
• Zero-Balance Fallback: Automatic claim-and-bypass logic via Faucet.
• Deterministic Receipts: Capture and normalization of payment proofs (JWS).

📦 Installation

pip install ln-church-agent

🚀 Quick Start (Generic Client)

Note: The client currently works out-of-the-box with LN Church-compatible 402 APIs. It is designed to evolve toward broader, protocol-agnostic 402 client reuse in future releases.

The client is designed to communicate with any API endpoint that implements the x402/L402 protocol standards. It seamlessly abstracts both EVM Gasless (x402) and Lightning Network (L402) settlements.

⚡ Supported Lightning Providers

You can configure the backend Lightning node used for L402 settlements by setting the ln_provider argument:

• LNBits (Default): Set ln_provider="lnbits". Requires both ln_api_url and ln_api_key (Admin or Invoice key).
• Alby: Set ln_provider="alby". Pass your Alby Bearer Access Token into the ln_api_key parameter. The URL is handled automatically.

from ln_church_agent import Payment402Client, AssetType

# 1. Initialize the generic 402 client with full capabilities
# You can easily switch Lightning providers (e.g., "lnbits" or "alby").
client = Payment402Client(
    private_key="0xYourAgentPrivateKey...",      # Required for x402 & Identity
    base_url="https://your-custom-402-api.com/api/agent",
    
    # --- Lightning Network Setup ---
    # Example A: Using LNBits (Default)
    ln_api_url="https://your-lnbits-url",
    ln_api_key="your-lnbits-api-key",
    
    # Example B: Using Alby
    ln_provider="alby", 
    ln_api_key="your-alby-access-token"  # Acts as the universal token/key slot
)

# 2. Execute with Polygon Gasless (x402)
# The SDK handles EIP-712 hashing, signing, and relayer orchestration.
result_x402 = client.draw_omikuji(asset=AssetType.USDC)

# OR Execute with Lightning Network (L402)
# The SDK parses the Macaroon, pays the Bolt11 invoice via your chosen provider.
result_l402 = client.draw_omikuji(asset=AssetType.SATS)

print(f"Receipt: {result_x402.receipt.txHash}")

🔌 MCP (Model Context Protocol) Integration

You can instantly equip any MCP-compatible agent (like Claude Desktop) with cross-chain 402-payment capabilities. The bundled MCP server provides a tool called execute_paid_entropy_oracle.

Run the MCP server:

# Requires AGENT_PRIVATE_KEY in your environment variables
python -m ln_church_agent.integrations.mcp

What the AI Agent sees: The agent can autonomously choose the settlement layer by passing the asset_type argument ("USDC", "JPYC", or "SATS"). The SDK will autonomously negotiate the 402 challenge and return the cryptographic receipt to the agent's context.

⛩️ Reference Service: LN Church Oracle

This SDK comes bundled with LN Church (https://kari.mayim-mayim.com/api/agent) as its primary reference API. LN Church is a high-uptime entropy oracle and capability benchmark for AI agents. By default, if base_url is omitted, the SDK connects to the LN Church Oracle to help you test your agent's payment capabilities instantly.

from ln_church_agent import Payment402Client, AssetType

# Connects to the LN Church Reference API by default
# Ensure LNBits credentials are provided for L402 (SATS) testing.
client = Payment402Client(
    private_key="0xYourEVMKey...", 
    ln_api_url="https://your-lnbits", 
    ln_api_key="your-lnbits-key"
)

client.init_probe()             # Verify connectivity
client.claim_faucet_if_empty()  # Get free test credits if balance is zero
result = client.draw_omikuji()  # Execute paid oracle

🦜 LangChain Integration

Easily integrate the client into your LangChain agent's toolset:

from ln_church_agent.integrations.langchain import LNChurchOracleTool

tools = [LNChurchOracleTool(private_key="0x...")]
# Pass this tool to your LangChain AgentExecutor

License

MIT

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