Open & close positions

Open at market or limit, then close fully or partially.

Prerequisite: a funded, delegated wallet — see Set up & fund a wallet.

Pick your entry

You want to…	Use
Enter now at market	open-position with orderType: "MARKET" (default)
Enter at a target price	open-position with orderType: "LIMIT" + limitPrice → Limit orders
See the quote, commit nothing	open-position without owner (returns transactionBase64: null)

Open

curl -X POST $FLASH_API_URL/transaction-builder/open-position -d '{
  "inputTokenSymbol": "USDC", "outputTokenSymbol": "SOL",
  "inputAmountUi": "100.0", "leverage": 5.0, "tradeType": "LONG",
  "owner": "<WALLET>"
}'

Sign, submit to the v2 RPC, confirm. Attach exits in the same call with takeProfit / stopLoss → Take-profit & stop-loss.

→ Every field: API reference › Trading › Open position

Read the result

The trade response is a quote, not state. Read the position from the basket:

curl $FLASH_API_URL/owner/<WALLET>

→ Read positions & orders

Close

close-position does both full and partial closes. Set closeAll: true to force a full close regardless of rounding.

# Full close
curl -X POST $FLASH_API_URL/transaction-builder/close-position -d '{
  "marketSymbol": "SOL", "side": "LONG", "inputUsdUi": "500", "closeAll": true,
  "withdrawTokenSymbol": "USDC", "owner": "<WALLET>"
}'

# Partial close ($200 of a $500 position)
curl -X POST $FLASH_API_URL/transaction-builder/close-position -d '{
  "marketSymbol": "SOL", "side": "LONG", "inputUsdUi": "200",
  "withdrawTokenSymbol": "USDC", "owner": "<WALLET>"
}'

→ API reference › Trading › Close position

Related

• Resize an open position → Increase, decrease & reverse

• Lower your liquidation price → Manage collateral