Solgrid.Pumpfun

C# SDK for pump.fun on Solana. Bonding-curve instructions (v1 and v2), PumpSwap swap instructions, account types, event decoders, curve and pool math, plus a client that routes a trade to wherever the coin currently lives. Built from the official IDLs in pump-fun/pump-public-docs.

Solnet.Pumpfun is dead and predates creator fees, usdc-paired coins and PumpSwap. This is the current program, in C#.

Built with Solgrid.Pumpfun

Some projects built with this SDK:

• PumpCopy - copytrade bot for SLP tokens on PumpFun and PumpSwap (.NET8, pre-compiled)

Trade a coin

var rpc = ClientFactory.GetClient("https://your.rpc");
var client = new PumpClient(rpc, Account.FromSecretKey(File.ReadAllText("key.txt").Trim()));

var state = await client.GetCoinStateAsync(mint);
var tokens = await client.QuoteBuyTokensAsync(state, 100_000_000); // 0.1 SOL

var (ok, err, sig) = await client.BuyAsync(mint, 100_000_000, slippageBps: 500, cuPrice: 500_000);

BuyAsync picks v1 or v2 by the coin's quote mint and routes migrated coins through PumpSwap. SellAsync does the same in reverse and can close your ATA on a full exit.

Watch the whole tape

var ws = ClientFactory.GetStreamingClient("wss://your.rpc");
var stream = new TradeStream(ws);
stream.Trade += t => Console.WriteLine($"{t.User} {(t.IsBuy ? "bought" : "sold")} {t.Mint}");
stream.Migration += m => Console.WriteLine($"{m.Mint} graduated to pool {m.Pool}");
await stream.StartAsync();

Build your own instructions

All builders are pure: PumpInstructions.Buy/Sell, PumpInstructionsV2.*, AmmInstructions.Buy/Sell. Account lists follow the current IDL exactly — including creator vaults, volume accumulators and the fee-program CPI that the old SDKs omit and that make old transactions fail today.

Math lives in BondingMath (curve, 1% protocol fee) and PoolMath (pAMM constant product with lp/protocol/creator fees on effective quote reserves).

Notes

• fee recipient and fee bps are read from the on-chain Global account, not hardcoded; they rotate
• pool reserves come from the pool vault accounts plus Pool.virtual_quote_reserves (effective reserves, per the docs)
• keys never leave your process; signing is local, sending goes through whatever rpc you passed in

Known issues

• TradeStream subscribes to the pump program only: you get curve trades and migrations, but not PumpSwap fills. The AmmSwapEvent decoder is there, the second subscription is not wired yet
• alchemy ws confirmed subscriptions but never delivered notifications for me on two different keys; a public wss endpoint worked for the same window. test your ws provider before blaming the sdk