SingIt Claude Opus 5.5 Chat

Chat completions API for Claude Opus 5.5 (Anthropic), OpenAI-compatible. Pay per call in USDC on Base or Solana, no key; you sign a price cap.

Open endpoint ↗

Price per call: $0.006
Chain: Base
Method: POST
Paid calls · 30 days: 5

Call it from code

This API is run by its own provider and paid directly through x402. We list it so you can find it; we don't route or hold the payment.

import { x402Client, wrapFetchWithPayment } from "@x402/fetch";
import { registerExactEvmScheme } from "@x402/evm/exact/client";

const client = new x402Client();
registerExactEvmScheme(client, { signer: agentAccount });

const pay = wrapFetchWithPayment(fetch, client);
const res = await pay("https://ask.singitai.app/v1/chat/claude-opus-5.5", { method: "POST" });
console.log(await res.json());

https://ask.singitai.app/v1/chat/claude-opus-5.5