dex-execution

name	dex-execution
description	Solana DEX swap execution via Jupiter aggregator including quoting, transaction building, signing, and confirmation

DEX Execution — Solana Swap Execution via Jupiter

Execute token swaps on Solana through Jupiter, the dominant DEX aggregator routing across Raydium, Orca, Meteora, Phoenix, Lifinity, and 20+ other venues.

Overview

Jupiter aggregates liquidity across all major Solana DEXes to find optimal swap routes. A single swap may split across multiple pools and hop through intermediate tokens to minimize price impact. The Jupiter v6 API handles route discovery, transaction building, and fee optimization — your code handles quoting, user confirmation, signing, and submission.

Base URL: https://quote-api.jup.ag/v6

Execution Pipeline

Every swap follows this seven-step pipeline. Never skip steps 2-3 (display and confirm).

Step 1 — Get Quote

import httpx

params = {
    "inputMint": "So11111111111111111111111111111111111111112",   # SOL
    "outputMint": "EPjFWdd5AufqSSqeM2qN1xzybapC8G4wEGGkZwyTDt1v", # USDC
    "amount": 1_000_000_000,  # 1 SOL in lamports
    "slippageBps": 50,        # 0.5%
}
resp = httpx.get("https://quote-api.jup.ag/v6/quote", params=params)
quote = resp.json()

Step 2 — Display Quote to User

Always show these fields before proceeding:

Field	Source
Input amount	quote["inAmount"] (in token decimals)
Output amount	quote["outAmount"]
Minimum received	quote["otherAmountThreshold"]
Price impact	quote["priceImpactPct"]
Route	quote["routePlan"] — DEXes used
Slippage	The slippageBps you requested

Step 3 — Require User Confirmation

⚠️  SWAP PREVIEW
    Selling:   1.000 SOL
    Buying:    ~142.50 USDC
    Min recv:  141.79 USDC (0.5% slippage)
    Impact:    0.01%
    Route:     Raydium V4 → USDC

    Proceed? [y/N]

NEVER proceed without explicit "yes" from the user.

Step 4 — Build Transaction

swap_body = {
    "quoteResponse": quote,
    "userPublicKey": "YourPubkeyBase58...",
    "wrapAndUnwrapSol": True,
    "dynamicComputeUnitLimit": True,
    "prioritizationFeeLamports": "auto",
}
resp = httpx.post("https://quote-api.jup.ag/v6/swap", json=swap_body)
swap_data = resp.json()
swap_tx = swap_data["swapTransaction"]  # base64-encoded transaction

Step 5 — Sign Transaction

import base64
from solders.transaction import VersionedTransaction
from solders.keypair import Keypair

raw_tx = base64.b64decode(swap_tx)
tx = VersionedTransaction.from_bytes(raw_tx)
keypair = Keypair.from_base58_string(os.environ["WALLET_PRIVATE_KEY"])
tx.sign([keypair])

Step 6 — Submit Transaction

rpc_url = os.environ.get("SOLANA_RPC_URL", "https://api.mainnet-beta.solana.com")
signed_bytes = bytes(tx)
payload = {
    "jsonrpc": "2.0", "id": 1,
    "method": "sendTransaction",
    "params": [
        base64.b64encode(signed_bytes).decode(),
        {"encoding": "base64", "skipPreflight": False,
         "maxRetries": 3, "preflightCommitment": "confirmed"}
    ],
}
resp = httpx.post(rpc_url, json=payload)
sig = resp.json()["result"]
print(f"Submitted: https://solscan.io/tx/{sig}")

Step 7 — Confirm Transaction

import time

for attempt in range(30):
    payload = {
        "jsonrpc": "2.0", "id": 1,
        "method": "getSignatureStatuses",
        "params": [[sig], {"searchTransactionHistory": False}],
    }
    resp = httpx.post(rpc_url, json=payload)
    status = resp.json()["result"]["value"][0]
    if status and status.get("confirmationStatus") in ("confirmed", "finalized"):
        print(f"Confirmed at slot {status['slot']}")
        break
    time.sleep(2)
else:
    print("Transaction not confirmed within 60s — check explorer")

Jupiter API v6 Endpoints

Endpoint	Method	Purpose
/quote	GET	Get best-price quote with routing
/swap	POST	Build a swap transaction from a quote
/swap-instructions	POST	Get individual instructions (advanced)
/price?ids=token1,token2	GET	Simple price lookup (v2)
/tokens	GET	List all supported tokens

See references/jupiter_api.md for full parameter and response documentation.

Key Parameters

Slippage (slippageBps)

Token Type	Recommended Range	Notes
SOL, USDC, major tokens	50-100 (0.5-1%)	Stable liquidity
Mid-cap tokens	100-300 (1-3%)	Variable liquidity
PumpFun / meme tokens	500-2000 (5-20%)	Thin books, high volatility
New launches (<1h old)	1000-3000 (10-30%)	Extreme volatility

Dynamic Slippage

Set dynamicSlippage: true in the swap request to let Jupiter auto-adjust slippage based on current market conditions. Preferred for most use cases.

Priority Fees (prioritizationFeeLamports)

Priority fees determine transaction ordering within a block.

Level	microLamports	When to Use
Low	10,000-50,000	Normal conditions
Medium	50,000-200,000	Moderate congestion
High	200,000-1,000,000	High congestion / time-sensitive
Urgent	1,000,000-5,000,000	Meme coin launches, NFT mints
Auto	"auto"	Jupiter estimates for you

Use "auto" for most cases. For fine-grained control, query Helius getPriorityFeeEstimate.

Other Parameters

• onlyDirectRoutes: Skip multi-hop routing. Faster but may get worse price.
• asLegacyTransaction: Use legacy format instead of versioned transactions. Required for some older wallets.
• maxAccounts: Limit accounts in transaction (default 64). Lower values reduce route options but improve confirmation reliability.
• platformFeeBps: Integrator fee in basis points. Taken from output amount.
• wrapAndUnwrapSol: Auto wrap/unwrap SOL ↔ wSOL (default true).
• dynamicComputeUnitLimit: Auto-set compute budget based on simulation.

Priority Fee Estimation

# Using Helius getPriorityFeeEstimate
helius_url = f"https://mainnet.helius-rpc.com/?api-key={HELIUS_KEY}"
payload = {
    "jsonrpc": "2.0", "id": 1,
    "method": "getPriorityFeeEstimate",
    "params": [{"accountKeys": [input_mint, output_mint],
                "options": {"recommended": True}}],
}
resp = httpx.post(helius_url, json=payload)
fee = resp.json()["result"]["priorityFeeEstimate"]

Transaction Confirmation Strategy

See references/transaction_lifecycle.md for the full Solana transaction lifecycle.

1. Submit with skipPreflight: False to catch obvious errors
2. Poll getSignatureStatuses every 2 seconds for up to 60 seconds
3. If not confirmed: rebuild transaction with fresh blockhash and retry (max 3 attempts)
4. Blockhash expiry: transactions expire ~60 seconds after blockhash was fetched
5. Final check: verify token balance changed as expected

Error Handling

Error	Cause	Recovery
"Slippage tolerance exceeded"	Price moved beyond slippageBps	Increase slippage or retry
"Insufficient funds"	Not enough input token or SOL for fees	Check balance before quoting
"Transaction expired"	Blockhash too old	Rebuild with fresh blockhash
"Transaction simulation failed"	Various — check logs	Parse simulation logs for root cause
"Too many accounts"	Route uses too many accounts	Set maxAccounts lower or use onlyDirectRoutes
HTTP 429	Rate limited	Back off and retry with exponential delay
HTTP 400 "No route found"	No liquidity path exists	Check token mints are correct, try larger slippage

Safety Requirements

These are non-negotiable requirements for any execution code.

1. ALWAYS show quote details (amounts, price impact, route) before execution
2. ALWAYS require explicit user confirmation — never auto-execute
3. Default to simulation mode — do not sign or submit unless explicitly enabled
4. Never store or log private keys — load from env vars, use immediately, discard
5. Never use 100% slippage — this is a common scam/exploit vector
6. Verify token addresses — confirm mints match expected tokens before swapping
7. Check price impact — warn if >2%, block if >10% unless user overrides
8. Maintain SOL reserve — keep 0.05 SOL minimum for rent and future fees

See references/safety_checklist.md for the complete pre/during/post execution checklist.

Integration with Other Skills

Skill	Integration
slippage-modeling	Estimate optimal slippageBps based on token liquidity profile
liquidity-analysis	Verify pool depth supports trade size before quoting
position-sizing	Calculate trade amount based on risk parameters
risk-management	Enforce portfolio-level exposure limits before execution
jupiter-api	Underlying API documentation for Jupiter endpoints
helius-api	Priority fee estimation and transaction monitoring

Files

References

• references/jupiter_api.md — Complete Jupiter v6 API parameter and response reference
• references/transaction_lifecycle.md — Solana transaction lifecycle, priority fees, retry strategies
• references/safety_checklist.md — Pre/during/post execution verification checklist

Scripts

• scripts/get_quote.py — Fetch and display Jupiter swap quotes with route analysis
• scripts/simulate_swap.py — Build and simulate swap transactions without submitting