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Three programs, three schemas. Farm v3, v5, and v6 are separate programs with separate state layouts. This page documents each side by side. In practice most new integrations target v6; v3 and v5 are read-only for most integrators (staking already happened there long ago and the pools are in wind-down).

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Account inventory (per farm, any version)

AccountOwnerPurpose
FarmStateFarm program (v3/v5/v6)Root state: staking mint, total staked, reward streams.
farm_authorityFarm programPDA that owns the staking vault and the reward vaults.
staking_vaultSPL TokenHolds staked LP (or whatever the staking mint is).
reward_vault_{i}SPL TokenHolds the undistributed budget for reward stream i. One per stream.
UserStake (v3/v5) / UserLedger (v6)Farm programPer-(farm, user) ledger: staked amount + snapshot of reward-per-share per stream.
The SDK returns the full set on raydium.farm.getFarmById. For arbitrary third-party farms, the API endpoint GET https://api-v3.raydium.io/main/farms/info?ids=<FARM_ID> also returns them.

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FarmState layout — v6

v6 is the current version. Its account structure is the most general. 
// programs/farm_v6/src/state/farm.rs (abridged)
pub struct FarmState {
    pub state: u64,                // bitfield: 0 = live, 1 = paused, ...
    pub nonce: u64,                 // bump for farm_authority
    pub creator: Pubkey,            // original creator (can add rewards / transfer admin)
    pub staking_mint: Pubkey,
    pub staking_vault: Pubkey,
    pub staking_token_program: Pubkey, // SPL Token or Token-2022
    pub lp_mint_decimals: u8,
    pub reward_period_len: u64,     // minimum duration between SetRewards edits
    pub reward_period_min: u64,
    pub total_staked: u64,
    pub reward_info_count: u8,
    pub _reserved: [u8; ...],
    pub reward_infos: [RewardInfo; 5], // up to 5 reward streams
}

pub struct RewardInfo {
    pub reward_state: u8,           // 0 = unused, 1 = running, 2 = ended
    pub open_time: u64,             // start_time
    pub end_time: u64,
    pub last_update_time: u64,
    pub emission_per_second_x64: u128, // Q64.64 fixed-point rate
    pub reward_total_emissioned: u64,   // sum of emissions so far
    pub reward_claimed: u64,            // sum paid out to stakers
    pub reward_vault: Pubkey,
    pub reward_mint: Pubkey,
    pub reward_sender: Pubkey,          // who deposited the budget; can top up
    pub reward_token_program: Pubkey,   // SPL or Token-2022
    pub reward_per_share_x64: u128,     // Q64.64 counter
}
Integrator-facing fields:
  • staking_mint, staking_vault — what gets staked and where it sits.
  • total_staked — current total. Required to compute APR: reward_per_second × 86400 / total_staked.
  • reward_infos[i].emission_per_second_x64 — the Q64.64 rate. Divide by 2^64 for the true per-second token count.
  • reward_infos[i].open_time / end_time — for UI “X days left” displays.
  • reward_infos[i].reward_per_share_x64 — the counter the UserLedger debts off.

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FarmState layout — v5

pub struct FarmStateV5 {
    pub state: u64,
    pub nonce: u64,
    pub lp_vault: Pubkey,            // aka staking_vault
    pub reward_vaults: [Pubkey; 2],
    pub owner: Pubkey,
    pub reward_mints: [Pubkey; 2],
    pub reward_total_emissioned: [u64; 2],
    pub reward_claimed: [u64; 2],
    pub reward_per_second: [u64; 2],  // integer, not fixed-point
    pub reward_open_time: [u64; 2],
    pub reward_end_time: [u64; 2],
    pub reward_per_share: [u128; 2],  // Q56.8 or similar; check program source
    pub total_staked: u64,
    pub last_slot: u64,               // v5 updates per-slot on mainnet
    pub _reserved: [u8; 256],
}
Differences from v6:
  • Per-slot, not per-second. v5’s update loop runs on slots rather than on the wall clock. The SDK normalizes this into “per-second” for the UI but on-chain the unit is slots.
  • Integer emission rate. reward_per_second is u64. This caps the minimum expressible rate at 1 unit per second, which is too coarse for low-emission streams on 9-decimal mints. v6 fixed this with the Q64.64 rate.
  • No reward_sender. On v5 the owner is the implicit sender; only owner can top up.

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FarmState layout — v3

pub struct FarmStateV3 {
    pub state: u64,
    pub nonce: u64,
    pub lp_vault: Pubkey,
    pub reward_vault: Pubkey,          // single reward
    pub owner: Pubkey,
    pub reward_mint: Pubkey,
    pub reward_total_emissioned: u64,
    pub reward_claimed: u64,
    pub reward_per_slot: u64,
    pub reward_per_share: u128,
    pub total_staked: u64,
    pub last_slot: u64,
    pub _reserved: [u8; 256],
}
Single-reward. Slot-based. The oldest program generation, kept alive for the RAY-USDC and SOL-USDC farms that predate v5.

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UserLedger (v6) / UserStake (v5/v3)

Per-user state, one account per (farm, user) pair. Seeded PDA: 
// v6
const [ledgerPda] = PublicKey.findProgramAddressSync(
  [farmId.toBuffer(), user.toBuffer(), Buffer.from("user_stake_info_v2")],
  FARM_V6_PROGRAM_ID,
);

// v5
const [stakePda] = PublicKey.findProgramAddressSync(
  [farmId.toBuffer(), user.toBuffer(), Buffer.from("user_stake_info")],
  FARM_V5_PROGRAM_ID,
);

// v3
const [stakePda] = PublicKey.findProgramAddressSync(
  [farmId.toBuffer(), user.toBuffer(), Buffer.from("staker_info")],
  FARM_V3_PROGRAM_ID,
);
(Seed strings are the values actually used by the SDK; program versions have historically varied them. Verify against the v6 source for anything security-critical.) 
// v6
pub struct UserLedger {
    pub version: u64,
    pub farm_id: Pubkey,
    pub owner: Pubkey,
    pub deposited: u64,                          // current stake
    pub reward_debts: [u128; 5],                 // snapshot of reward_per_share_x64 × deposited
}
The per-stream debt is the accounting offset described in the overview: 
pending_for_stream_i = deposited × reward_per_share_x64[i] / 2^64  − reward_debts[i]
After each Deposit, Withdraw, or Harvest, the debt is reset to the current deposited × reward_per_share_x64[i] / 2^64.

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Authority PDAs

// v6
const [farmAuthorityV6] = PublicKey.findProgramAddressSync(
  [farmId.toBuffer()],
  FARM_V6_PROGRAM_ID,
);

// v5
const [farmAuthorityV5] = PublicKey.findProgramAddressSync(
  [farmId.toBuffer()],
  FARM_V5_PROGRAM_ID,
);

// v3
const [farmAuthorityV3] = PublicKey.findProgramAddressSync(
  [farmId.toBuffer()],
  FARM_V3_PROGRAM_ID,
);
All three versions derive the farm authority per-farm with a single seed. This PDA is the authority on the staking vault and on each reward vault. It signs every transfer the farm makes.

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Vaults

Staking and reward vaults are standard SPL Token accounts whose owner is the farm authority PDA. Addresses are stored on FarmState — do not re-derive; read from state. Freeze authorities must be disabled on the staking mint for v5/v6 (the program checks). Token-2022 notes:
  • v3: SPL Token only.
  • v5: SPL Token only.
  • v6: Supports Token-2022 on both staking and reward mints, gated on staking_token_program / reward_token_program fields. Transfer fees on Token-2022 reward mints are charged on emit (vault → user).

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Observation and APR

Farms do not store APR on-chain. To compute: 
annualized_rewards_value_usd = reward_per_second × 86400 × 365 × reward_usd_price
tvl_usd                     = total_staked / 10^decimals × staking_mint_usd_price
apr                         = annualized_rewards_value_usd / tvl_usd
Consumers typically pull staking_mint_usd_price from the pool the LP belongs to (via api-v3.raydium.io/pools/info/ids) and reward_usd_price from any price oracle.

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Where to go next

Sources: