@arbiterlabs/langchain

@arbiterlabs/langchain

LangChain tools that let an agent check an action before taking it.

npm install @arbiterlabs/langchain @langchain/core

import { createArbiterTools } from "@arbiterlabs/langchain";

const { tools } = createArbiterTools({
  baseUrl: "https://arbiter-hs23.onrender.com",
  privateKey: process.env.ALGO_KEY,
  maxTotalSpendUsd: 10,
});

const agent = createReactAgent({ llm, tools });

Tools

judge_transaction · judge_counterparty · judge_human · retrieve_human_verdict

All of them share one client, so the spend cap applies across the whole agent — a budget that resets per tool is not a budget.

Tool errors are returned as readable text rather than thrown, so a failed check lets the agent recover instead of aborting the run.

Paying

Calls are settled per request in USDC on Algorand over x402. There is no API key and no account — payment is the authentication.

Your payer account needs USDC and must be opted in to the USDC asset. On Algorand a transfer to an account that has not opted in is rejected outright, so an un-opted-in payer cannot pay at all. Fees are sponsored by the facilitator, so the payer does not need ALGO.

Route	Price
Transaction verdict	$0.002
Counterparty verdict	$0.01
Human judgment	$0.25

Full documentation: https://arbiter-hs23.onrender.com/docs

Licence

MIT