Access Tokens

// Route handler on your backend, for example POST /api/relay-token
export async function POST() {
  // 1. Mint a token with your API key (server-side only)
  const response = await fetch("https://api.relay.link/access-tokens", {
    method: "POST",
    headers: {
      "x-api-key": process.env.RELAY_API_KEY!,
      "Content-Type": "application/json",
    },
    body: JSON.stringify({}),
  });
  if (!response.ok) {
    const { errorCode } = await response.json();
    return Response.json({ error: errorCode }, { status: response.status });
  }

  // 2. Return only the token and its expiry to your client
  const { token, expiresAt } = await response.json();
  return Response.json({ token, expiresAt });
}

// 1. Get a token from your backend, never the API key
const { token } = await fetch("/api/relay-token", { method: "POST" }).then(
  (r) => r.json()
);

// 2. Call Relay with the token
const quote = await fetch("https://api.relay.link/quote/v2", {
  method: "POST",
  headers: {
    Authorization: `Bearer ${token}`,
    "Content-Type": "application/json",
  },
  body: JSON.stringify({
    user: "WALLET_ADDRESS",
    originChainId: 8453,
    destinationChainId: 10,
    originCurrency: "0x0000000000000000000000000000000000000000",
    destinationCurrency: "0x0000000000000000000000000000000000000000",
    amount: "1000000000000000000",
    tradeType: "EXACT_INPUT",
  }),
});