Can I enter?

// npm i @x402/fetch @x402/evm viem   (Node 18+)
// WARNING: running this spends real USDC ($0.03/call, Base mainnet).
// Inspect the offer first, free of charge:
const probe = await fetch("https://api.canienter.com/v1/check?passport=NLD&destination=JPN");
console.log(probe.status, /* 402 */ JSON.parse(atob(probe.headers.get("PAYMENT-REQUIRED"))));

// Then pay per call — key from an env var, never hardcoded or logged:
import { wrapFetchWithPaymentFromConfig } from "@x402/fetch";
import { ExactEvmScheme } from "@x402/evm";
import { privateKeyToAccount } from "viem/accounts";

const account = privateKeyToAccount(process.env.X402_PRIVATE_KEY);
const payFetch = wrapFetchWithPaymentFromConfig(fetch, { schemes: [
  { network: "eip155:8453", client: new ExactEvmScheme(account) }]});

const res = await payFetch(
  "https://api.canienter.com/v1/check?passport=NLD&destination=JPN");
if (!res.ok) throw new Error("check failed: " + res.status);
const { requirement, allowed_stay_days } = await res.json();

# The API publishes its own agent skill (Claude Code paths shown;
# Codex/Cursor/other agents: use your agent's skills directory)
mkdir -p ~/.claude/skills/visa-check
curl -s "https://api.canienter.com/.well-known/agent-skills/visa-check/SKILL.md" \
  -o ~/.claude/skills/visa-check/SKILL.md

# Discovery index with the SKILL.md sha256 digest (verify, updates, extras):
curl -s "https://api.canienter.com/.well-known/agent-skills/index.json"

# Remove: delete ~/.claude/skills/visa-check

Agent skill này cho phép agent tra cứu yêu cầu nhập cảnh và trả phí theo từng yêu cầu qua x402. Không có khóa API nào có thể bị rò rỉ.