Quick Start - Your First Swap

Quote -> Build -> Sign -> Submit in four steps. Takes under 5 minutes if you have an API key and a signer.

Step 1: Get a Quote

curl -X POST https://api.gateway.zert.com/api/v1/quote \
  -H "Authorization: Bearer YOUR_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "fromChain": "solana",
    "toChain": "avax",
    "tokenIn": "SOL",
    "tokenOut": "WETH",
    "network": "mainnet",
    "amount": "100.00",
    "slippageBps": 75,
    "recipient": "0x1234567890123456789012345678901234567890"
  }'

The response includes a routes array. Each route has:

• routeId — pass this to Step 2

• expectedAmountOut — projected output for that route

Step 2: Build the Signing Step

Swagger does not auto-fill quoteId and routeId from Step 1. Paste the fresh values from the previous quote response when testing in the docs UI.

curl -X POST https://api.gateway.zert.com/api/v1/swap/build \
  -H "Authorization: Bearer YOUR_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "quoteId": "REPLACE_WITH_QUOTE_ID_FROM_POST_QUOTE",
    "routeId": "REPLACE_WITH_ROUTE_ID_FROM_SELECTED_ROUTE",
    "recipient": "0x1234567890123456789012345678901234567890",
    "waitForTxRequestMs": 300
  }'

Leave Idempotency-Key blank for one-off Swagger or curl calls. If you need retry-safe dedupe on direct HTTP calls, send your own UUIDv4 or ULID only when retrying the exact same payload. SDK and Postman flows can generate one automatically.

The response includes:

• swapId — use this for the rest of the flow

• mode — sync if the signable payload is ready now, async if you should poll

• signing — the signable payload when mode is sync

If the signing surface for the active step is not configured, the API returns 503 instead of a placeholder transaction payload.

Step 3: Poll Until a Signable Payload Is Ready

If Step 2 returns mode: "async", poll:

curl "https://api.gateway.zert.com/api/v1/swap/your-swap-id/signing" \
  -H "Authorization: Bearer YOUR_API_KEY"

When the response returns mode: "sync", hand the payload to the external wallet or signer. Postman does not sign transactions.

Step 4: Submit the Signed Artifact

curl -X POST "https://api.gateway.zert.com/api/v1/swap/your-swap-id/signing" \
  -H "Authorization: Bearer YOUR_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "rawTx": "0x_signed_tx_from_external_wallet"
  }'

If the execution has more than one signing step, keep polling the same endpoint until the next payload is ready.

Track On-Chain Status (Optional)

curl "https://api.gateway.zert.com/api/v1/status/transaction/0x123...abc?chainRef=polygon-mainnet" \
  -H "Authorization: Bearer YOUR_API_KEY"

Status	Meaning
pending	Submitted, not yet confirmed
confirmed	Confirmed on chain
failed	Transaction failed

What's Next

Next step	Go to
Understand the full swap lifecycle in detail	Guides → Full swap flow
Discover which chains, tokens, and pairs are available	Guides → Discovery: chains, tokens, and pairs
Set up limit orders	Guides → Limit orders