Ravn Examples MCP Server

RAVN examples

Working code for the RAVN cross-chain swap API — including native Bitcoin, not wrapped BTC.

One integration covers EVM chains, native Bitcoin and Solana. Every quote races every live execution venue in parallel and the best net output wins. RAVN takes 0 bps on every route. Non-custodial: RAVN never holds your funds and writes no smart contracts of its own.

No signup required to start. Every example below runs anonymously.

git clone https://github.com/ravndex/ravn-examples
cd ravn-examples && npm install
npm run health

The examples

The contract

Four calls, always the same order.

POST /quote   → best route + an opaque quoteToken
POST /execute → an execution payload tagged by executionType
                (+ submit-signature, when the type is SIGNATURE)
GET  /status  → pending → processing → success (or refunded / failed)

Everything branches on one field:

switch (execution.executionType) {
  case "TRANSACTION": // sign and broadcast it yourself
  case "SIGNATURE":   // sign typed data; RAVN submits it, no gas
  case "DEPOSIT":     // send the input asset to an address
}

The one thing that trips people up

An ERC-20 swap is really two transactions. Before any contract can move your tokens you must sign a separate on-chain permission — an approve(). TRANSACTION and SIGNATURE payloads carry that ready to send, as approval, whenever it's needed.

if (execution.approval) {
  const hash = await wallet.sendTransaction(execution.approval);
  await client.waitForTransactionReceipt({ hash });   // MINED, not just broadcast
}
// …now send the swap

Broadcasting the swap before the allowance is mined reverts on transferFrom and the user eats the gas. On gasless venues (CoW, Bebop) it's quieter and worse: the order is accepted and simply never fills, with no error. Native-coin sells, already-approved tokens and DEPOSIT routes omit approval entirely.

RAVN doesn't read the chain for you, so approval can appear on a token you've already approved — check the allowance for approval.spender and skip it when it already covers approval.amount.

unlimitedRecommended: true (CoW) means the venue would rather you approve once for a large amount than pay approval gas on every swap. data still encodes the exact amount; raising it is your call.

Amounts

Always strings, always the token's smallest unit — wei, lamports, satoshis. Never floats. toBaseUnits() / fromBaseUnits() in src/ravn.ts convert safely.

Cross-ecosystem swaps

Selling on EVM and receiving BTC or SOL needs a destinationAddress — the payout chain has no idea what your EVM address is.

Rate limits

Pass it as x-api-key. CORS is enabled on every endpoint, so browser-side dapps and wallet widgets can call the API directly with no server-side proxy.

Errors

Branch on the stable code, never the message.

INVALID_REQUEST · UNSUPPORTED_TOKEN · UNSUPPORTED_CHAIN · NO_LIQUIDITY · QUOTE_EXPIRED · QUOTE_INVALID · RATE_LIMITED · UNAUTHORIZED · INTERNAL

Every response carries x-request-id. Quote it if you report a bad quote — it's how we find it.

Links

• Docs — https://docs.ravn.exchange
• App — https://app.ravn.exchange
• MCP server — https://app.ravn.exchange/api/mcp
• OpenAPI spec (Postman / Insomnia import) — https://app.ravn.exchange/openapi.json
• Partnerships — team@ravn.exchange · @ravnexchange

MIT licensed. Issues and PRs welcome.