A place for an Agent’s own things.

import { wrapFetchWithPaymentFromConfig } from "@x402/fetch";
import { ExactEvmScheme, toClientEvmSigner } from "@x402/evm";
import { privateKeyToAccount } from "viem/accounts";
import { createPublicClient, http } from "viem";
import { taiko, base } from "viem/chains";

const account  = privateKeyToAccount("0x...");  // holds USDC on Taiko or Base
const taikoSig = toClientEvmSigner(account, createPublicClient({ chain: taiko, transport: http() }));
const baseSig  = toClientEvmSigner(account, createPublicClient({ chain: base,  transport: http() }));

const pay = wrapFetchWithPaymentFromConfig(fetch, {
  schemes: [
    { network: "eip155:167000", client: new ExactEvmScheme(taikoSig) }, // Taiko
    { network: "eip155:8453",   client: new ExactEvmScheme(baseSig)  }, // Base
  ],
});

// Pin a CID for 6 months. USDC on whichever chain your wallet holds.
const res = await pay("https://tack.inferenceroom.ai/pins", {
  method: "POST",
  headers: { "X-Pin-Duration-Months": "6" },
  body: JSON.stringify({ cid: "Qm..." }),
});

import { Mppx, tempo } from "mppx/client";
import { privateKeyToAccount } from "viem/accounts";

const account = privateKeyToAccount("0x...");  // holds USDC.e on Tempo

const mppx = Mppx.create({
  methods: [tempo({ account })],   // Tempo 4217
});

// Same endpoint. USDC.e on Tempo.
const res = await mppx.fetch("https://tack.inferenceroom.ai/pins", {
  method: "POST",
  headers: { "X-Pin-Duration-Months": "6" },
  body: JSON.stringify({ cid: "Qm..." }),
});

# Ask for the quote. Tack returns a machine-readable 402.
curl -i -X POST https://tack.inferenceroom.ai/pins \
  -H "X-Pin-Duration-Months: 6" \
  -d '{"cid":"Qm..."}'

# → HTTP/1.1 402 Payment Required
# → payment-required:   accepts=[
# →   {network:"eip155:167000", asset:"USDC", amount:"0.10"},  # Taiko
# →   {network:"eip155:8453",   asset:"USDC", amount:"0.10"},  # Base
# → ]
# → WWW-Authenticate: Payment method="tempo", chainId=4217     # Tempo (MPP)

# Pick any chain your wallet holds. Sign, retry. Tack pins, returns 202.

// Same wallet, same x402 (or MPP) credential as /pins.
// Tack stores the bytes on its private volume — no CID is emitted.
const bytes = new TextEncoder().encode("agent memory: ...");

const res = await pay("https://tack.inferenceroom.ai/private/objects", {
  method: "POST",
  headers: {
    "Content-Type":               "application/octet-stream",
    "X-Content-Size-Bytes":        String(bytes.byteLength),
    "X-Storage-Duration-Months":  "3",
    "X-Object-Name":              "agent-memory-2026-05-14",
  },
  body: bytes,
});

// Object id is in the JSON body, bearer token is in the response header.
const { id } = await res.json();
const bearer = res.headers.get("x-wallet-auth-token");

// Read the bytes back any time. Only the paying wallet can.
const read = await fetch(`${o}/private/objects/${id}/content`, {
  headers: { "Authorization": `Bearer ${bearer}` },
});