Vulcx gives builders production-ready swap routing on Fogo without running any infrastructure of their own.

• Multi-hop, split routing — up to five hops per path, with size split across multiple routes when that beats a single path.
• Start with no key — /quote, /swap, /instructions and /price answer anonymous requests, so the first call costs you nothing to set up. A free key raises your budget from 1 to 100 cost units per second; the WebSocket stream is the one endpoint that always needs one.
• Firm quotes — every quote carries a quoteId. Redeem it and you commit at the price you were shown, or the request fails cleanly — no signed transaction that reverts on chain.
• Transaction builder — get back a ready-to-sign transaction, or raw instructions if you're composing your own.
• On-chain settlement — a single Solana program executes the routed swap atomically, including split routes, in one transaction.

Revenue comes from the on-chain protocol fee, not from gating API access — which is why the API stays usable without an account.

npm install @vulcx/sdk

import { VulcxSDK } from "@vulcx/sdk";

// The key is optional — omit it to try things out anonymously.
const vulcx = new VulcxSDK({ apiKey: process.env.VULCX_KEY });

const quote = await vulcx.quote({
  inputMint: "So11111111111111111111111111111111111111112",
  outputMint: "uSd2czE61Evaf76RNbq4KPpXnkiL3irdzgLFUMe3NoG",
  amount: "1000000000", // 1 FOGO (9 decimals)
  swapMode: "ExactIn",
  slippageBps: 50,
});

console.log(`Output: ${quote.amountOut}, Impact: ${quote.priceImpactPercent}`);

Keys are free during beta and issued by hand — request one, or ask on Telegram.

_{The route engine and on-chain settlement program aren't open source. Self-hosting the engine is planned and not released yet.}