fix / remove double-counting of priority fee in getFee

[fengtality]

Summary

• Fix transaction fee calculation that was double-counting priority fees
• Solana RPC meta.fee already includes both base fee and priority fee
• Previous code extracted priority fee from compute budget instructions and added it again

New in this update:

• Add Solana error parser for user-friendly error messages
• Simplify /poll endpoint (remove tokens/walletAddress params)
• Parse on-chain transaction errors into structured format: TYPE (code): message
• Add error helper functions for consistent error handling

Error Parser

Parses program-specific error codes into user-friendly messages:

Program	Error Codes	Type
Jupiter	6001	SLIPPAGE_EXCEEDED
Meteora DLMM	6004, 6018, 6040	SLIPPAGE_EXCEEDED, MATH_OVERFLOW, INVALID_POSITION
Raydium CLMM	6029-6031, 6037	SLIPPAGE_EXCEEDED, PRICE_LIMIT_OVERFLOW
Orca Whirlpool	6029-6031	SLIPPAGE_EXCEEDED

Example poll response for failed transaction:

{
  "txStatus": -1,
  "fee": 0.000403,
  "error": "SLIPPAGE_EXCEEDED (0x1771): Slippage tolerance exceeded. The output amount would be less than your minimum.",
  "txData": {...}
}

Affected Connectors

Connector	Status
Meteora CLMM	✅ Fixed
Orca CLMM	✅ Fixed
Raydium CLMM	✅ Unaffected (reads meta.fee directly)
PancakeSwap-Sol CLMM	✅ Unaffected (reads meta.fee directly)

Related PRs

QA Note: These 4 PRs should be tested together as a coordinated release.

Repo	PR	Description
hummingbot	#8150	Move retry logic from executors to connectors
hummingbot-api	#142	Add SwapExecutor with connector-level retry
hummingbot-api-client	#16	Add swap/lp executor client support
gateway	#620	Fix fee calculation, add error parsing (this PR)

Test plan

• Verify build passes
• Test LP operations on Meteora and verify fee is correct
• Compare reported fee with Solscan transaction fee
• Test poll endpoint with failed transaction signature
• Verify error parsing for slippage errors

🤖 Generated with Claude Code

[rapcmia]

Commit 04b6777

• Test LP operations on Meteora and verify fee is correct ✅
  • Successfully opened position address GViwfJPXZdqBSmeee82x7pt1ZLPZfegfXMFFWtdWxBwB
  • Get Amount added + positon rent + network fee ok
  • The before, after and delta matches the wallet balance
• Compare reported fee with Solscan transaction fee matched ✅
• Test poll endpoint with failed transaction signature ✅
  • Submitted an oversized Meteora add-liquidity request on our open position
  • Polled the failed txns from the earlier add-liquidity request via /chains/solana/poll
  • Poll endpoint returned txStatus -1

    curl -s -X POST http://localhost:15888/chains/solana/poll -H "Content-Type: application/json" -d '
    {
      "network": "mainnet-beta",
      "signature": "HzuVjkD2U8XfvUDwuDzhb65aY1Tnejfrkbev7g9WyfR1Cnjo8Hv4AdMXPyrKYdLVdMzQkajsC3uv1cqrfJ8Ljr4"
    }' | jq
    {
      "currentBlock": 411650624,
      "signature": "HzuVjkD2U8XfvUDwuDzhb65aY1Tnejfrkbev7g9WyfR1Cnjo8Hv4AdMXPyrKYdLVdMzQkajsC3uv1cqrfJ8Ljr4",
      "txBlock": 266559915,
      "txStatus": -1,
      "fee": 0.000075,
      "error": "INSUFFICIENT_BALANCE (unknown): Insufficient funds for transaction.",
      "txData": {
        "meta": {
          "fee": 75000,
          "err": {
            "InsufficientFundsForRent": {
              "account_index": 0
            }
          }
        },
        "blockTime": 1716055030
      }
    }
    logs: 2026-04-07 06:36:55 | info | 	Transaction HzuVjkD2U8XfvUDwuDzhb65aY1Tnejfrkbev7g9WyfR1Cnjo8Hv4AdMXPyrKYdLVdMzQkajsC3uv1cqrfJ8Ljr4 failed: INSUFFICIENT_BALANCE (unknown): Insufficient funds for transaction.
    

• Verify error parsing for slippage errors ❗
  • jupiter/rommuter, code SLIPPAGE_EXCEEDED ✅
  • raydium/clmm, code SLIPPAGE_EXCEEDED ✅
  • For meteora and orca, im still not able to get the SLIPAGE_EXCEEDED error ❗
    • For most of the test i used 0 slippage and do swaps ended with SIMULATION_FAILED, transcation timeout or successful