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First run walks you through wallet setup automatically.

npx x402-proxy mcp add surf https://surf.cascade.fyi/mcp

npx x402-proxy mcp add surf "https://surf.cascade.fyi/mcp?tools=surf_twitter_search,surf_web_crawl"

const res = await fetchX402("https://surf.cascade.fyi/api/v1/inference/completions", {
  method: "POST",
  headers: { "Content-Type": "application/json" },
  body: JSON.stringify({
    model: "moonshotai/kimi-k2.5",
    messages: [{ role: "user", content: "Write a haiku" }],
    stream: true,
  }),
});

const reader = res.body!.getReader();
const decoder = new TextDecoder();
while (true) {
  const { done, value } = await reader.read();
  if (done) break;
  const chunk = decoder.decode(value);
  for (const line of chunk.split("\n")) {
    if (line.startsWith("data: ") && line !== "data: [DONE]") {
      const data = JSON.parse(line.slice(6));
      process.stdout.write(data.choices[0]?.delta?.content ?? "");
    }
  }
}

npm install @x402/fetch @x402/evm @x402/svm

import { x402Client, wrapFetchWithPayment } from "@x402/fetch";
import { registerExactSvmScheme } from "@x402/svm/exact/client";
import { createKeyPairSignerFromBytes } from "@solana/kit";
import { base58 } from "@scure/base";

const svmSigner = await createKeyPairSignerFromBytes(base58.decode(process.env.SVM_PRIVATE_KEY!));
const client = new x402Client();
registerExactSvmScheme(client, { signer: svmSigner });
const fetchX402 = wrapFetchWithPayment(fetch, client);

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

const signer = privateKeyToAccount(process.env.EVM_PRIVATE_KEY as `0x${string}`);
const client = new x402Client();
registerExactEvmScheme(client, { signer });
const fetchX402 = wrapFetchWithPayment(fetch, client);

const res = await fetchX402("https://surf.cascade.fyi/api/v1/twitter/user/cascade_fyi");
const { data } = await res.json();

npx x402-proxy https://surf.cascade.fyi/api/v1/twitter/user/cascade_fyi | jq '.data'
npx x402-proxy wallet            # addresses and balances
npx x402-proxy wallet history    # payment log

let cursor: string | undefined;
const allTweets = [];

do {
  const res = await fetchX402("https://surf.cascade.fyi/api/v1/twitter/user", {
    method: "POST",
    headers: { "Content-Type": "application/json" },
    body: JSON.stringify({ ref: "cascade_fyi", cursor }),
  });
  const { data, meta } = await res.json();
  allTweets.push(...data.tweets);
  cursor = meta?.has_next_page ? meta.next_cursor : undefined;
} while (cursor);