POST /broadcast

POST https://hubra.app/api/v1/broadcast

curl -X POST https://hubra.app/api/v1/broadcast \
  -H 'Content-Type: application/json' \
  -d '{
    "signed_tx":   "<base64 signed tx>",
    "hubra_token": "<token from /stake or /unstake response>"
  }'

{
  "signature": "5z6Z...",
  "explorer":  "https://solscan.io/tx/5z6Z..."
}

import { VersionedTransaction, Keypair } from "@solana/web3.js";

// 1. Build the unsigned tx
const buildResp = await fetch("https://hubra.app/api/v1/stake", {
  method: "POST",
  headers: { "Content-Type": "application/json" },
  body: JSON.stringify({
    strategy: "sol-liquid-stake",
    wallet:   walletPubkey,
    amount:   "1.0",
  }),
}).then((r) => r.json());

const { transaction, hubra_token, route, sanctumKind, sanctum_order } = buildResp;

// 2. Sign locally
const tx = VersionedTransaction.deserialize(Buffer.from(transaction, "base64"));
tx.sign([wallet]); // wallet is a Keypair you hold
const signed = Buffer.from(tx.serialize()).toString("base64");

// 3. Broadcast — forward Sanctum-specific fields when applicable
const broadcastBody =
  route === "sanctum"
    ? { signed_tx: signed, hubra_token, route, sanctumKind, sanctum_order }
    : { signed_tx: signed, hubra_token };

const { signature } = await fetch("https://hubra.app/api/v1/broadcast", {
  method: "POST",
  headers: { "Content-Type": "application/json" },
  body: JSON.stringify(broadcastBody),
}).then((r) => r.json());

console.log(`Confirmed: https://solscan.io/tx/${signature}`);