Stip

The human has a paid seat and a policy (agent, caps, allowlist, expiry). An API returns HTTP 402. Charge native Circle USDC only, and only to a payTo on the allowlist.

Import from lib/client/agent.ts. Load the agent key from local env — the human keeps it. A short local script is scripts/demo-agent.ts. Pass operator so paidFetch dry-runs Stip policy before signing. A single-network 402 (Tavily on Base) needs no preferredNetwork. Dual-network Stip dummy still defaults to Avalanche C-Chain; set preferredNetwork to eip155:8453 to pick Base.

import { paidFetch } from "../lib/client/agent";

const key = process.env.AGENT_PRIVATE_KEY as `0x${string}`;

const { response, settlement } = await paidFetch(
  "https://example.com/paid",
  { method: "GET" },
  {
    privateKey: key,
    operator: process.env.STIP_OPERATOR,
    fundingUrl: "https://usestip.com/fund",
  },
);

1. Read the policy caps and allowlist. Stop if PAUSED, REVOKED, or EXPIRED.
2. Fund the agent EOA with native USDC on Avalanche C-Chain or Base. Not USDC.e, not USDT, not Stip.
3. Call the API with paidFetch. On 402 it checks policy, then signs and retries.
4. On OVER_PER_TX, OVER_DAILY, PAYTO_NOT_ALLOWED, AGENT_MISMATCH, or BAD_ASSET: stop and show the human the code. Do not spend off the allowlist.