Nory x402 Payment Tools for LlamaIndex

Enable your LlamaIndex AI agents to make blockchain payments using the x402 HTTP payment protocol.

Features

• Multi-chain support: Solana and 7 EVM chains (Base, Polygon, Arbitrum, Optimism, Avalanche, Sei, IoTeX)
• Sub-400ms settlement: Fast payment finality for real-time agent interactions
• x402 HTTP protocol: Native support for HTTP 402 Payment Required responses
• Simple integration: Drop-in tool spec for any LlamaIndex agent

Installation

pip install llama-index-tools-nory-x402

Quick Start

from llama_index.agent.openai import OpenAIAgent
from llama_index_tools_nory_x402 import NoryX402ToolSpec

# Create the tool spec
tool_spec = NoryX402ToolSpec()

# Create an agent with payment capabilities
agent = OpenAIAgent.from_tools(tool_spec.to_tool_list())

# Use the agent
response = agent.chat("Check if the Nory payment service is healthy")
print(response)

Available Tools

get_payment_requirements

Get x402 payment requirements for accessing a paid resource.

requirements = tool_spec.get_payment_requirements(
    resource="/api/premium/data",
    amount="0.10",  # $0.10 USDC
    network="solana-mainnet"
)

verify_payment

Verify a signed payment transaction before settlement.

result = tool_spec.verify_payment(payload="base64-encoded-payload")

settle_payment

Settle a payment on-chain with ~400ms settlement time.

result = tool_spec.settle_payment(payload="base64-encoded-payload")

lookup_transaction

Look up transaction status.

status = tool_spec.lookup_transaction(
    transaction_id="tx-signature",
    network="solana-mainnet"
)

health_check

Check Nory service health and see supported networks.

health = tool_spec.health_check()

Supported Networks

Authentication

For public endpoints, no API key is required. For authenticated endpoints:

tool_spec = NoryX402ToolSpec(api_key="your-api-key")

How It Works

1. Your agent encounters an HTTP 402 Payment Required response
2. Use get_payment_requirements to learn how much to pay
3. Sign and encode the payment transaction (client-side)
4. Use verify_payment to validate before submission
5. Use settle_payment to execute the payment on-chain
6. Access the paid resource with the payment receipt

Links

• Nory - Payment infrastructure for AI agents
• x402 Protocol - HTTP payment protocol specification
• LlamaIndex - Data framework for LLM applications

License

MIT