Solana Development — Web3.js, Anchor, SPL Tokens & On-Chain Patterns

Apply Solana development patterns used throughout the Pump SDK: Anchor IDL-based program interaction, SPL Token and Token-2022 account management, transaction construction with instruction composition, RPC batching, and cross-program account coordination.

Anchor Program Initialization

import { Program, AnchorProvider } from '@coral-xyz/anchor';

function getPumpProgram(connection: Connection): Program<Pump> {
    const provider = new AnchorProvider(
        connection,
        { publicKey: PublicKey.default, signTransaction: async (tx) => tx, signAllTransactions: async (txs) => txs },
        { commitment: 'confirmed' }
    );
    return new Program(pumpIdl as Pump, PUMP_PROGRAM_ID, provider);
}

Offline pattern: Uses a dummy provider (no wallet) for building instructions. Actual signing happens in the caller's code.

Instruction Building with accountsStrict

const ix = await program.methods
    .buy(amount, maxSolCost, flags)
    .accountsStrict({
        global: GLOBAL_PDA,
        bondingCurve: bondingCurvePda(mint),
        user: userPublicKey,
        // ... all required accounts
    })
    .remainingAccounts(additionalAccounts)
    .instruction();

PDA Derivation

const [pda, bump] = PublicKey.findProgramAddressSync(
    [Buffer.from("bonding-curve"), mint.toBuffer()],
    PUMP_PROGRAM_ID
);

RPC Batching

const accounts = await connection.getMultipleAccountsInfo([
    bondingCurvePda(mint),
    GLOBAL_PDA,
    FEE_CONFIG_PDA,
]);

Token-2022 Support

The SDK supports both SPL Token and Token-2022:

• createV2Instruction creates Token-2022 mints
• tokenProgram parameter selects the appropriate program
• Associated Token Accounts (ATAs) are created idempotently

Account Decoding

const bondingCurve = program.coder.accounts.decode('bondingCurve', accountInfo.data);

Nullable variants handle missing accounts:

const bc = decodeBondingCurveNullable(accountInfo); // returns null instead of throwing

Transaction Simulation

const result = await connection.simulateTransaction(tx, [signer]);
// Parse return data from simulation logs

BN.js Arithmetic

All amounts use BN for arbitrary-precision integer arithmetic:

const fee = amount.mul(new BN(feeBps)).div(new BN(10000));
const ceilFee = amount.mul(new BN(feeBps)).add(new BN(9999)).div(new BN(10000));

Patterns to Follow

• Always use accountsStrict — not accounts — for type-safe account specification
• Use getMultipleAccountsInfo to batch account fetches
• Build instruction arrays, not transactions — let callers compose
• Handle both Token and Token-2022 programs via parameter
• Use nullable decoders for optional accounts

Common Pitfalls

• AnchorProvider with dummy wallet is for instruction building only — never sign with it
• getMultipleAccountsInfo returns nulls for missing accounts — always check
• Transaction size limit is 1232 bytes — large instruction sets may need multiple transactions
• remainingAccounts order matters — the on-chain program reads them positionally