pumpfun-python

Buy and sell on PumpFun bonding curves + PumpSwap AMM. Directly from Python. No Jupiter needed.

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Why?

PumpFun tokens start on a bonding curve and graduate to a PumpSwap AMM pool. Jupiter doesn't always route through these — and when it does, you're at the mercy of their routing engine. This library builds the raw Solana instructions so you can swap directly.

• Pre-graduation — buy/sell against the PumpFun bonding curve (v2, 16/14 accounts)
• One-call helpers — build_buy / build_sell read the curve, quote, and return ready unsigned instructions
• Post-graduation — legacy PumpSwap swap (13 accounts) + pool readers. For the current Pump AMM (pAMMBay) buy/sell path, use the companion package pumpswap-python.
• Zero dependencies beyond solders + httpx — no SDK bloat
• Production-tested — extracted from a live trading system

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Install

pip install pumpfun-python

Or from source:

pip install git+https://github.com/JinUltimate1995/pumpfun-python.git

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Quick Start

🚀 One-call buy/sell (read curve → unsigned instructions)

import asyncio, httpx
from solders.keypair import Keypair
from solders.transaction import VersionedTransaction
from pumpfun import build_buy, build_message, fetch_latest_blockhash

RPC = "https://api.mainnet-beta.solana.com"   # use your own (Helius/QuickNode) for real volume
wallet = Keypair()                            # load your real keypair
MINT = "TokenMintAddress..."

async def main():
    async with httpx.AsyncClient() as client:
        plan = await build_buy(RPC, wallet.pubkey(), MINT, sol_lamports=100_000_000,
                               slippage_bps=500, http_client=client)
        blockhash = await fetch_latest_blockhash(RPC, http_client=client)
    print(f"expected_tokens={plan.expected_tokens:,} max_sol_cost={plan.max_sol_cost}")
    msg = build_message(wallet.pubkey(), plan.instructions, blockhash)
    tx = VersionedTransaction(msg, [wallet])  # ← you sign + send

asyncio.run(main())

Selling is symmetric: await build_sell(RPC, wallet.pubkey(), MINT, token_amount=1_000_000, http_client=client).

💰 Calculate buy/sell amounts (no RPC needed)

from pumpfun import calculate_buy_amount, calculate_sell_amount

# How many tokens for 0.1 SOL?
tokens = calculate_buy_amount(
    sol_amount_lamports=100_000_000,  # 0.1 SOL
    virtual_sol_reserves=30_000_000_000,
    virtual_token_reserves=1_000_000_000_000,
)
print(f"Tokens received: {tokens:,}")

# How much SOL for selling 1M tokens?
sol_out = calculate_sell_amount(
    token_amount=1_000_000,
    virtual_sol_reserves=30_000_000_000,
    virtual_token_reserves=1_000_000_000_000,
)
print(f"SOL received: {sol_out / 1e9:.6f}")

📈 Read bonding curve state

RPC calls require your own Solana RPC endpoint. Get a free key from Helius, QuickNode, or use the public endpoint (rate-limited).

import asyncio
from pumpfun import fetch_bonding_curve_state

async def main():
    state = await fetch_bonding_curve_state(
        rpc_url="https://api.mainnet-beta.solana.com",
        token_mint="YourTokenMintAddress",
    )
    print(f"Reserves: {state.virtual_sol_reserves} SOL, {state.virtual_token_reserves} tokens")
    print(f"Complete (graduated): {state.complete}")
    print(f"Creator: {state.creator}")

asyncio.run(main())

🔨 Build a buy instruction

from solders.pubkey import Pubkey
from pumpfun import build_buy_instruction, get_bonding_curve_pda

user = Pubkey.from_string("YourWalletAddress")
token_mint = Pubkey.from_string("TokenMintAddress")
bonding_curve = get_bonding_curve_pda(token_mint)

ix = build_buy_instruction(
    user=user,
    token_mint=token_mint,
    bonding_curve=bonding_curve,
    sol_amount_lamports=100_000_000,  # 0.1 SOL max
    min_tokens_out=950_000,           # slippage protection
    creator=Pubkey.from_string("CreatorAddress"),
    fee_recipient=Pubkey.from_string("62qc2CNXwrYqQScmEdiZFFAnJR262PxWEuNQtxfafNgV"),
)
# Add `ix` to your transaction

🏊 PumpSwap AMM swap

from pumpfun import calculate_swap_output, build_swap_instruction, fetch_pool_state

# Read pool state
pool = await fetch_pool_state(rpc_url, "PoolAddress")

# Calculate output
amount_out, fee = calculate_swap_output(
    amount_in=100_000_000,  # 0.1 SOL
    reserve_in=5_000_000_000,
    reserve_out=1_000_000_000_000,
    lp_fee_bps=pool.lp_fee_basis_points,
    protocol_fee_bps=pool.protocol_fee_basis_points,
)

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API Reference

High-level (read curve → unsigned instructions)

Function	Description
build_buy()	Read curve, quote, return BuyPlan (create-ATA + buy)
build_sell()	Read curve, quote, return SellPlan (sell + close-ATA)
build_message()	Compile a v0 message (compute budget prepended) for signing
fetch_latest_blockhash()	Recent blockhash for transaction assembly
detect_token_program()	SPL Token vs Token-2022, auto-detected per mint

Bonding Curve (pre-graduation)

Function	Description
calculate_buy_amount()	Tokens received for SOL input (1% fee)
calculate_sell_amount()	SOL received for token input (1% fee)
build_buy_instruction()	Build PumpFun v2 BUY ix (16 accounts)
build_sell_instruction()	Build PumpFun v2 SELL ix (14 accounts)
fetch_bonding_curve_state()	Read reserves, creator, completion from chain
fetch_fee_recipient()	Read fee recipient from Global account

PumpSwap AMM (post-graduation)

Function	Description
calculate_swap_output()	Output amount for constant-product swap
build_swap_instruction()	Build PumpSwap swap ix (13 accounts)
fetch_pool_state()	Read pool vaults, mints, fees from chain

PDA Helpers

Function	Description
get_bonding_curve_pda()	Derive bonding curve PDA for a mint
get_associated_token_address()	Derive ATA (SPL Token or Token-2022)

Constants

All program IDs are exported: PUMP_FUN_PROGRAM, PUMP_SWAP_PROGRAM, PUMP_AMM_PROGRAM, plus system programs, discriminators, and fee accounts.

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Account Layout Notes

BUY instruction uses 16 accounts + 1 remaining account (bonding-curve-v2 PDA).

SELL instruction uses 14 accounts + 1 remaining — but creator_vault [8] and token_program [9] are SWAPPED relative to buy. This is an undocumented PumpFun quirk that causes failed transactions if you copy the buy layout.

Pump AMM pools (pAMMBay program) can have reversed base/quote — base_mint=SOL, quote_mint=TOKEN. The PoolState.base_is_sol flag indicates this.

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Also by JinUltimate1995

• pumpswap-python — direct Pump AMM (pAMMBay) swaps for graduated tokens. The natural next step once a curve completes.
• jupiter-swap-python — Jupiter swap client for Python. Async. Typed.
• solana-rpc-resilient — Fault-tolerant Solana RPC with automatic failover.
• dexscreener-python — DexScreener API client for Python.

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License

MIT