Vulcx architecture — how swaps are routed on SVM chains

Vulcx system overview: the SDK and your app call the Vulcx API at api.vulcx.xyz over HTTPS (GET /quote, POST /swap). The API finds the best-price route across all pools and returns an unsigned transaction. Your wallet signs and submits it on-chain to Fogo, where liquidity comes from Valiant, Fluxbeam, and Moonit. — Your app calls the Vulcx API, which finds the best-price route and returns an unsigned transaction; your wallet signs and submits it to Fogo.

Data flow

Client                    Vulcx API                 Fogo
  │                           │                          │
  GET /quote                  │                          │
  ──────────────────────────> │                          │
                              │  find best route         │
  QuoteResponse               │  across all pools        │
  <────────────────────────── │                          │
                              │                          │
  POST /swap                  │                          │
  ──────────────────────────> │                          │
                              │  build transaction       │
  unsigned transaction        │                          │
  <────────────────────────── │                          │
                              │                          │
  sign + submit ────────────────────────────────────────>│
                              │                          │
  confirmation <─────────────────────────────────────────│

Components

API Server. HTTP service that handles quote requests, builds swap transactions, and returns raw instructions. Stateless and horizontally scalable. Routing Engine. Off-chain route search that evaluates routes across all supported DEXs on Fogo. Finds direct swaps, multi-hop paths (e.g., Token A → FOGO → USDC → Token B), and split routes across multiple pools. Supported DEXs. Valiant (concentrated liquidity), Fluxbeam (AMM) (bonding curves), and Moonit (bonding curves). On-chain Program. Verifies and executes the swap instructions atomically. If any hop fails or slippage is exceeded, the entire transaction reverts.

Three integration paths

Path	Endpoint	Use case
Transaction	`POST /api/v1/swap`	Get a ready-to-sign transaction. Sign it and submit. Simplest integration.
Instructions	`POST /api/v1/instructions`	Get raw instructions to compose with your own transaction logic (e.g., adding custom instructions before/after the swap).
CPI accounts	`POST /api/v1/cpi/route-accounts`	Call the `route` instruction on-chain from another program via CPI, signed by your program’s PDA. Makes a swap one atomic step inside your protocol. See Composing Swaps On-Chain.

The first two paths start with GET /api/v1/quote to find the best route. For prices that update in real time, the API also exposes a WebSocket quote stream that pushes a new quote whenever a pair’s price changes.

​Data flow

​Components

​Three integration paths

Data flow

Components

Three integration paths