Rust CPI

[dependencies]
anchor-lang            = "0.29"
anchor-spl             = "0.29"
raydium_cp_swap        = { git = "https://github.com/raydium-io/raydium-cp-swap", features = ["cpi"] }
raydium_amm_v3         = { git = "https://github.com/raydium-io/raydium-clmm",    features = ["cpi"] }
# AMM v4 and farm v6: no published Anchor CPI crate. See "AMM v4 / farm v6" below.

use anchor_lang::prelude::*;
use anchor_spl::token::{Token, TokenAccount, Mint};

#[derive(Accounts)]
pub struct MyProxySwap<'info> {
    #[account(mut)]
    pub user: Signer<'info>,

    /// CHECK: validated by CPMM
    #[account(mut)]
    pub pool_state: UncheckedAccount<'info>,

    /// CHECK: ditto
    pub amm_config: UncheckedAccount<'info>,

    /// CHECK: ditto
    pub pool_authority: UncheckedAccount<'info>,

    #[account(mut)]
    pub input_vault: Account<'info, TokenAccount>,
    #[account(mut)]
    pub output_vault: Account<'info, TokenAccount>,

    pub input_mint: Account<'info, Mint>,
    pub output_mint: Account<'info, Mint>,

    #[account(mut)]
    pub user_input_ata:  Account<'info, TokenAccount>,
    #[account(mut)]
    pub user_output_ata: Account<'info, TokenAccount>,

    pub cpmm_program: Program<'info, raydium_cp_swap::program::RaydiumCpSwap>,
    pub token_program: Program<'info, Token>,
    pub token_program_2022: Program<'info, anchor_spl::token_2022::Token2022>,
    /// CHECK: observation PDA
    #[account(mut)]
    pub observation_state: UncheckedAccount<'info>,
}

use raydium_cp_swap::cpi::{self, accounts::Swap as CpmmSwap};

pub fn my_proxy_swap(
    ctx: Context<MyProxySwap>,
    amount_in: u64,
    minimum_amount_out: u64,
) -> Result<()> {
    let cpi_accounts = CpmmSwap {
        payer:                ctx.accounts.user.to_account_info(),
        authority:            ctx.accounts.user.to_account_info(),
        amm_config:           ctx.accounts.amm_config.to_account_info(),
        pool_state:           ctx.accounts.pool_state.to_account_info(),
        input_token_account:  ctx.accounts.user_input_ata.to_account_info(),
        output_token_account: ctx.accounts.user_output_ata.to_account_info(),
        input_vault:          ctx.accounts.input_vault.to_account_info(),
        output_vault:         ctx.accounts.output_vault.to_account_info(),
        input_token_program:  ctx.accounts.token_program.to_account_info(),
        output_token_program: ctx.accounts.token_program.to_account_info(),
        input_token_mint:     ctx.accounts.input_mint.to_account_info(),
        output_token_mint:    ctx.accounts.output_mint.to_account_info(),
        observation_state:    ctx.accounts.observation_state.to_account_info(),
    };
    let cpi_ctx = CpiContext::new(
        ctx.accounts.cpmm_program.to_account_info(),
        cpi_accounts,
    );

    cpi::swap_base_input(cpi_ctx, amount_in, minimum_amount_out)?;
    Ok(())
}

let bump         = ctx.accounts.my_authority_bump;
let signer_seeds: &[&[&[u8]]] = &[&[b"my_authority", &[bump]]];

let cpi_ctx = CpiContext::new_with_signer(
    ctx.accounts.cpmm_program.to_account_info(),
    cpi_accounts,
    signer_seeds,
);

cpi::swap_base_input(cpi_ctx, amount_in, minimum_amount_out)?;

let cpi_ctx = CpiContext::new(program, accounts)
    .with_remaining_accounts(ctx.remaining_accounts.to_vec());

use raydium_cp_swap::error::ErrorCode as CpmmErr;

match cpi::swap_base_input(cpi_ctx, amount_in, minimum_amount_out) {
    Ok(_) => Ok(()),
    Err(e) => {
        msg!("CPMM swap failed: {:?}", e);
        // Re-raise, or convert to your own error type.
        Err(e)
    }
}

your_program_cu
+ ~1_500       (CPI overhead)
+ ~150_000     (CPMM swap, SPL-token variant)
+ ~200_000     (if Token-2022 with transfer fee)
+ ~10_000      (observation update)

use anchor_lang::solana_program::program::invoke_signed;
use anchor_lang::solana_program::instruction::{Instruction, AccountMeta};

const AMM_V4_PROGRAM_ID: Pubkey = pubkey!("675kPX9MHTjS2zt1qfr1NYHuzeLXfQM9H24wFSUt1Mp8");

// SwapBaseIn discriminator is 9.
let mut data = vec![9u8];
data.extend_from_slice(&amount_in.to_le_bytes());
data.extend_from_slice(&minimum_amount_out.to_le_bytes());

let ix = Instruction {
    program_id: AMM_V4_PROGRAM_ID,
    accounts: vec![
        AccountMeta::new_readonly(token_program_id, false),
        AccountMeta::new(amm_id, false),
        AccountMeta::new_readonly(amm_authority, false),
        // ... remaining accounts per products/amm-v4/instructions ...
    ],
    data,
};
invoke_signed(&ix, &account_infos, signer_seeds)?;

remaining_accounts = [
    reward_vault_0, user_reward_ata_0,
    reward_vault_1, user_reward_ata_1,
    ...
]