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Sardis

Sardis is the Payment OS for the Agent Economy — infrastructure enabling AI agents to make real financial transactions safely through non-custodial MPC wallets with natural language spending policies.

Installation and Setup

Install the Sardis LangChain integration:

pip install sardis-langchain

You'll need a Sardis API key. Set it as an environment variable:

export SARDIS_API_KEY="sk_..."
export SARDIS_WALLET_ID="wal_..."

Tools

SardisPaymentTool

Execute policy-controlled payments from an AI agent's wallet.

from langchain_sardis import SardisPaymentTool

tool = SardisPaymentTool()
result = tool.invoke({
    "amount": 25.00,
    "merchant": "openai",
    "purpose": "API credits"
})

SardisBalanceTool

Check wallet balance and remaining spending limits.

from langchain_sardis import SardisBalanceTool

tool = SardisBalanceTool()
result = tool.invoke({"token": "USDC"})

SardisPolicyCheckTool

Pre-check if a payment would be allowed by spending policy.

from langchain_sardis import SardisPolicyCheckTool

tool = SardisPolicyCheckTool()
result = tool.invoke({
    "amount": 500.00,
    "merchant": "aws"
})

Using all tools with an agent

from langchain_openai import ChatOpenAI
from langchain.agents import AgentExecutor, create_openai_tools_agent
from langchain_sardis import SardisPaymentTool, SardisBalanceTool, SardisPolicyCheckTool

llm = ChatOpenAI(model="gpt-4o")
tools = [
    SardisPaymentTool(),
    SardisBalanceTool(),
    SardisPolicyCheckTool(),
]

agent = create_openai_tools_agent(llm, tools, prompt)
agent_executor = AgentExecutor(agent=agent, tools=tools)

result = agent_executor.invoke({
    "input": "Check my balance and pay $50 to Vercel for hosting"
})

Key features

  • Policy guardrails: Every payment is checked against configurable spending policies before execution
  • Non-custodial: Uses MPC wallets — private keys are never stored
  • Multi-chain: Supports Base, Polygon, Ethereum, Arbitrum, and Optimism
  • Stablecoin native: USDC, USDT, EURC, and PYUSD
  • Audit trail: Full append-only ledger for all transactions

More information