POST /v1/tx/swap

Builds an unsigned transaction for a generic swap (power endpoint).

• Auth: required (see API Authentication)
• Errors: see Errors

HTTP

• Method: POST
• Path: /v1/tx/swap

Headers

Authorization: Bearer api_your_key_here
Content-Type: application/json

Body

{
  "inputMint": "SOL",
  "outputMint": "TOKEN_MINT",
  "amount": 0.002,
  "swapMode": "exactIn",
  "slippage": 0.05,
  "priority": "fast"
}

Fields

• inputMint / outputMint (string, required): "SOL" or a Solana mint address
• amount (number, required): (> 0)
• swapMode (string, required):
  • exactIn: amount is the exact input amount
  • exactOut: amount is the exact output amount
• slippage (number, required): decimal, (0 <= slippage < 1). Example: 0.05 = 5%
• priority (string, required): see Priority (economy | fast | faster | fastest)

SOL identifier

You can pass "SOL" as a generic identifier. Internally the API will normalize it to the specific SOL mint.

• Native SOL: So11111111111111111111111111111111111111111
• Wrapped SOL: So11111111111111111111111111111111111111112

Response

{
  "success": true,
  "data": {
    "submissionToken": "txn_…",
    "unsignedTransaction": "BASE64_WIRE_TRANSACTION",
    "expiresAt": "2025-01-01T00:00:00.000Z",
    "platform": "pump_fun",
    "inputMint": "TOKEN_MINT",
    "outputMint": "So11111111111111111111111111111111111111111",
    "estimates": {
      "inputAmount": 0.002,
      "outputAmount": 70598.459309,
      "priceImpact": 0.00346
    },
    "priorityCost": 0.000005125
  }
}

Notes

• submissionToken links this built transaction for submission via POST /v1/tx/submit.
• inputMint / outputMint are from the DEX perspective (what goes in vs what comes out).
• estimates are best-effort outputs assuming the market doesn’t move between build and execution.
• priceImpact shows how much your trade will move the price; 0.1 means ~10% price impact.