Connect your stack.

One agent key. Your code, your assistant, your workflow.

Node SDK

Let your agent handle an HTTP 402 without holding its own signing key.

import { Ultima } from "@ultima/sdk";

const client = await Ultima.connect();
const response = await client.fetch(url, {
  requestId: persistedRequestId
});

Local package: packages/ultima. Build with npm run build:sdk. Not published to npm yet.

MCP server

Connect a compatible assistant over stdio. Payment tools can spend within your agent policy.

ULTIMA_NODE_URL=https://your-service
ULTIMA_AGENT_KEY=<your-agent-key>

npm run mcp

Tools: wallet_status, paid_fetch, payment_receipt. Keep your key in the client environment, never in a prompt.

Before the first request

Create an agent → save its key → approve a vendor origin and recipient → fund with USDC. Reuse the same request ID after an uncertain result.

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