The Ultra API is a pay-per-call endpoint that returns ai completion, ultra tier — claude opus 4.6, the top-end reasoning model, pay usdc per call with no api key. for the hardest agent tasks: deep analysis, multi-step reasoning, and high-stakes drafting where model quality dominates cost. It is built for developers and AI agents who need this data on demand without scraping it themselves or signing up for a subscription.
You pay $0.25 per call in USDC on the Base network using the x402 protocol — there is no API key, no signup, and no monthly minimum. An AI agent (or your code) hits the URL, receives an HTTP 402 price quote, pays automatically, and gets clean JSON back.
GET https://api.gocreativeai.com/v1/ai/ultra/example
First request returns 402 Payment Required with a payment quote. Your x402 client autopays and retries, and you get structured JSON.
import httpx
from x402.clients.httpx import x402_payment_required
with httpx.Client() as c:
c.event_hooks["response"] = [x402_payment_required(
wallet_private_key="0x_YOUR_BASE_KEY", network="base")]
data = c.get("https://api.gocreativeai.com/v1/ai/ultra/example").json()
print(data)
This endpoint is part of a catalog of 450+ pay-per-call data tools and is exposed through a native MCP server, so Claude, Cursor, and custom agents can call it directly. The full machine-readable catalog is at https://api.gocreativeai.com/.well-known/x402.
Ready to try it? See the endpoint page or browse all endpoints.