Seedance API — no API key, pay per call

curl -i -X POST https://api.x402-video.com/generate/seedance-fast/5s-720p \
  -H 'Content-Type: application/json' \
  -d '{"prompt":"a corgi surfing a wave at sunset"}'

HTTP/1.1 402 Payment Required
content-type: application/json

{
  "x402Version": 1,
  "accepts": [{
    "scheme": "exact",
    "network": "base",
    "asset": "USDC",
    "maxAmountRequired": "450000",
    "payTo": "0x7f3a…c21e",
    "description": "Seedance 2.0 Fast · 5s 720p MP4"
  }]
}

npm i @x402/fetch @x402/evm viem

import { wrapFetchWithPayment, x402Client } from "@x402/fetch";
import { ExactEvmScheme, toClientEvmSigner } from "@x402/evm";
import { privateKeyToAccount } from "viem/accounts";

const account = privateKeyToAccount(process.env.BUYER_PRIVATE_KEY as `0x${string}`);
const signer = toClientEvmSigner(account);
const client = new x402Client().register("eip155:*", new ExactEvmScheme(signer));
const fetchPay = wrapFetchWithPayment(fetch, client);

// 402 → sign USDC payment → retry all happens automatically:
const res = await fetchPay("https://api.x402-video.com/generate/seedance-fast/5s-720p", {
  method: "POST",
  headers: { "Content-Type": "application/json" },
  body: JSON.stringify({ prompt: "a corgi surfing a wave at sunset" }),
});

const { job_id } = await res.json();

// Poll until done (free endpoint):
let video;
while (true) {
  const status = await fetch(`https://api.x402-video.com/jobs/${job_id}`).then(r => r.json());
  if (status.status === "succeeded") { video = status.video_url; break; }
  if (status.status === "failed" || status.status === "cancelled") throw new Error(status.status);
  await new Promise(r => setTimeout(r, 5000)); // poll every 5s
}
// Download video_url within 24h — link expires after that