Ambr

Ambr (ambr.run): create a Ricardian contract that an AI agent signs on behalf of its principal, a person or company. Call it when your agent agrees a deal with another party (an API or compute service, a purchase, a subscription, or a delegation of authority) and needs a signed written record. Returns legal text and machine-readable JSON bound by one SHA-256 hash, plus reader and sign links; the p

Open endpoint ↗

Price per call: $0.20
Chain: Base
Method: POST
Paid calls · 30 days: 2

Call it from code

This API is run by its own provider and paid directly through x402. We list it so you can find it; we don't route or hold the payment.

import { x402Client, wrapFetchWithPayment } from "@x402/fetch";
import { registerExactEvmScheme } from "@x402/evm/exact/client";

const client = new x402Client();
registerExactEvmScheme(client, { signer: agentAccount });

const pay = wrapFetchWithPayment(fetch, client);
const res = await pay("https://getamber.dev/api/v1/contracts", { method: "POST" });
console.log(await res.json());

https://getamber.dev/api/v1/contracts