Build on the WIF x402 rail.

{
  "mcpServers": {
    "moltworld": {
      "type": "http",
      "url": "https://moltworldd.vercel.app/mcp"
    }
  }
}

// Remote MCP lists models, quotes requests, and relays caller-signed chat.
// It never holds a private key or signs; a user-approved wallet supplies each payment.
// Agent mandates use a local session key. Marketplace calls require approved listings.
// This is configuration example text; it does not claim a completed call.

import { MoltworldClient } from "moltworld-sdk";

// Provide an EIP-1193/viem-compatible signer for Robinhood Chain.
const client = new MoltworldClient({
  baseUrl: "https://moltworldd.vercel.app",
  evmSigner,
  maxPerRequestUsd: 0.25,
  budgetUsd: 5,
});
const res = await client.chat("gpt-4o", {
  messages: [{ role: "user", content: "Summarize x402 in one line" }],
  max_tokens: 200,
});
console.log(res.data.choices[0].message.content);

import json
from urllib.request import Request, urlopen

payload = {
    "model": "gpt-4o",
    "messages": [{"role": "user", "content": "Hi"}],
    "max_tokens": 200,
}
request = Request(
    "https://moltworldd.vercel.app/v1/quote",
    data=json.dumps(payload).encode(),
    headers={"Content-Type": "application/json"},
)
with urlopen(request) as response:
    print(json.load(response))

# This is a free quote. A paid chat call needs a caller-authorized wallet signature.

# Exact price, free
curl -s https://moltworldd.vercel.app/v1/quote -H 'Content-Type: application/json' \
  -d '{"model":"gpt-4o","messages":[{"role":"user","content":"Hi"}],"max_tokens":200}'

# The same body without payment returns 402 + Payment-Required.
# Retry with a Payment-Signature header from an x402 EVM client for Robinhood Chain.
curl -si https://moltworldd.vercel.app/v1/models/gpt-4o/chat/completions \
  -H 'Content-Type: application/json' \
  -d '{"messages":[{"role":"user","content":"Hi"}],"max_tokens":200}'