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Add buy_exact_sol_in and buy_exact_quote_in instruction support

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- Add BUY_EXACT_SOL_IN_DISCRIMINATOR for PumpFun
- Add BUY_EXACT_QUOTE_IN_DISCRIMINATOR for PumpSwap
- Add use_exact_in_instruction field to SwapParams
- When enabled, uses exact input instructions that spend exactly the
  specified SOL/quote amount with slippage applied to output tokens
- Defaults to false for backwards compatibility

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
This commit is contained in:
vibes
2026-01-06 10:32:56 +00:00
co-authored by Claude Opus 4.5
parent e12c45cc4c
commit 16996b24d4
6 changed files with 52 additions and 10 deletions
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src/instruction/pumpfun.rs
+18 -4
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@@ -9,7 +9,7 @@ use crate::{
use crate::{
instruction::utils::pumpfun::{
accounts, get_bonding_curve_pda, get_creator, get_user_volume_accumulator_pda,
global_constants::{self},
global_constants::{self}, BUY_DISCRIMINATOR, BUY_EXACT_SOL_IN_DISCRIMINATOR,
},
utils::calc::{
common::{calculate_with_slippage_buy, calculate_with_slippage_sell},
@@ -118,9 +118,23 @@ impl InstructionBuilder for PumpFunInstructionBuilder {
}
let mut buy_data = [0u8; 24];
buy_data[..8].copy_from_slice(&[102, 6, 61, 18, 1, 218, 235, 234]); // Method ID
buy_data[8..16].copy_from_slice(&buy_token_amount.to_le_bytes());
buy_data[16..24].copy_from_slice(&max_sol_cost.to_le_bytes());
if params.use_exact_in_instruction {
// buy_exact_sol_in(spendable_sol_in: u64, min_tokens_out: u64)
// Spend exactly the input SOL amount, get at least min_tokens_out
let min_tokens_out = calculate_with_slippage_sell(
buy_token_amount,
params.slippage_basis_points.unwrap_or(DEFAULT_SLIPPAGE),
);
buy_data[..8].copy_from_slice(&BUY_EXACT_SOL_IN_DISCRIMINATOR);
buy_data[8..16].copy_from_slice(&params.input_amount.unwrap_or(0).to_le_bytes());
buy_data[16..24].copy_from_slice(&min_tokens_out.to_le_bytes());
} else {
// buy(token_amount: u64, max_sol_cost: u64)
// Buy exactly token_amount tokens, pay up to max_sol_cost
buy_data[..8].copy_from_slice(&BUY_DISCRIMINATOR);
buy_data[8..16].copy_from_slice(&buy_token_amount.to_le_bytes());
buy_data[16..24].copy_from_slice(&max_sol_cost.to_le_bytes());
}
// Determine fee recipient based on mayhem mode
let fee_recipient_meta = if is_mayhem_mode {