Fetching Pump.fun bonding curve state and calculating price of token/SOL.

rpc_fetch_pump_token_price.ts

import * as web3 from "@solana/web3.js";

//////////////////////////////////////////////////

function readBytes(buf: Buffer, offset: number, length: number): Buffer {
  const end = offset + length;
  if (buf.byteLength < end) throw new RangeError("range out of bounds");
  return buf.subarray(offset, end);
}

function readBigUintLE(buf: Buffer, offset: number, length: number): bigint {
  switch (length) {
    case 1: return BigInt(buf.readUint8(offset));
    case 2: return BigInt(buf.readUint16LE(offset));
    case 4: return BigInt(buf.readUint32LE(offset));
    case 8: return buf.readBigUint64LE(offset);
  }
  throw new Error(`unsupported data size (${length} bytes)`);
}

function readBoolean(buf: Buffer, offset: number, length: number): boolean {
  const data = readBytes(buf, offset, length);
  for (const b of data) {
    if (b) return true;
  }
  return false;
}

//////////////////////////////////////////////////

const PUMP_CURVE_TOKEN_DECIMALS = 6;

// Calculated as the first 8 bytes of: `sha256("account:BondingCurve")`.
const PUMP_CURVE_STATE_SIGNATURE = Uint8Array.from([0x17, 0xb7, 0xf8, 0x37, 0x60, 0xd8, 0xac, 0x60]);

const PUMP_CURVE_STATE_SIZE = 0x29;
const PUMP_CURVE_STATE_OFFSETS = {
  VIRTUAL_TOKEN_RESERVES: 0x08,
  VIRTUAL_SOL_RESERVES: 0x10,
  REAL_TOKEN_RESERVES: 0x18,
  REAL_SOL_RESERVES: 0x20,
  TOKEN_TOTAL_SUPPLY: 0x28,
  COMPLETE: 0x30,
};

interface PumpCurveState {
  virtualTokenReserves: bigint
  virtualSolReserves: bigint
  realTokenReserves: bigint
  realSolReserves: bigint
  tokenTotalSupply: bigint
  complete: boolean
}

// Fetches account data of a Pump.fun bonding curve, and deserializes it
// according to `accounts.BondingCurve` (see: Pump.fun program's Anchor IDL).
async function getPumpCurveState(conn: web3.Connection, curveAddress: web3.PublicKey): Promise<PumpCurveState> {
  const response = await conn.getAccountInfo(curveAddress);
  if (!response || !response.data || response.data.byteLength < PUMP_CURVE_STATE_SIGNATURE.byteLength + PUMP_CURVE_STATE_SIZE) {
    throw new Error("unexpected curve state");
  }

  const idlSignature = readBytes(response.data, 0, PUMP_CURVE_STATE_SIGNATURE.byteLength);
  if (idlSignature.compare(PUMP_CURVE_STATE_SIGNATURE) !== 0) {
    throw new Error("unexpected curve state IDL signature");
  }

  return {
    virtualTokenReserves: readBigUintLE(response.data, PUMP_CURVE_STATE_OFFSETS.VIRTUAL_TOKEN_RESERVES, 8),
    virtualSolReserves: readBigUintLE(response.data, PUMP_CURVE_STATE_OFFSETS.VIRTUAL_SOL_RESERVES, 8),
    realTokenReserves: readBigUintLE(response.data, PUMP_CURVE_STATE_OFFSETS.REAL_TOKEN_RESERVES, 8),
    realSolReserves: readBigUintLE(response.data, PUMP_CURVE_STATE_OFFSETS.REAL_SOL_RESERVES, 8),
    tokenTotalSupply: readBigUintLE(response.data, PUMP_CURVE_STATE_OFFSETS.TOKEN_TOTAL_SUPPLY, 8),
    complete: readBoolean(response.data, PUMP_CURVE_STATE_OFFSETS.COMPLETE, 1),
  };
}

// Calculates token price (in SOL) of a Pump.fun bonding curve.
function calculatePumpCurvePrice(curveState: PumpCurveState): number {
  if (curveState === null || typeof curveState !== "object"
    || !(typeof curveState.virtualTokenReserves === "bigint" && typeof curveState.virtualSolReserves === "bigint")) {
    throw new TypeError("curveState must be a PumpCurveState");
  }

  if (curveState.virtualTokenReserves <= 0n || curveState.virtualSolReserves <= 0n) {
    throw new RangeError("curve state contains invalid reserve data");
  }

  return (Number(curveState.virtualSolReserves) / web3.LAMPORTS_PER_SOL) / (Number(curveState.virtualTokenReserves) / 10 ** PUMP_CURVE_TOKEN_DECIMALS);
}

//////////////////////////////////////////////////

(async (rpcUrl: string) => {

  const conn = new web3.Connection(rpcUrl, "confirmed");

  const curveAddress = new web3.PublicKey("5BwXbPNGbfd2UuE8rkvASmJYXWXSiqmrhqJ1FX6rQnKd");
  const curveState = await getPumpCurveState(conn, curveAddress);
  if (!curveState) return;

  const tokenPriceSol = calculatePumpCurvePrice(curveState);

  //////////////////////////////////////////////////

  console.log("Token price:");
  console.log(`  ${(tokenPriceSol.toFixed(10))} SOL`);

})(process.env.SOL_RPC_URL || "https://mainnet.helius-rpc.com/?api-key=00000000-0000-0000-0000-000000000000");

@kristijorgji what isn't working?

Although it's a pretty old gist, it definitely still works. I think what many have struggled with is attempting to use token mint address (it's those addresses that end with the pump suffix, in most cases) as curveAddress.

If that's the issue that you are currently facing, you can derive one address from the other, as such:

// ...

// ┌──── ➕ ➕ ➕ ➕ ➕ ➕ ➕ ➕ ➕ ➕ ➕ ➕ ➕ ➕ ➕ ────┐
const PUMP_PROGRAM_ID = new web3.PublicKey("6EF8rrecthR5Dkzon8Nwu78hRvfCKubJ14M5uBEwF6P");
const PUMP_CURVE_SEED = Buffer.from("bonding-curve");

function findPumpCurveAddress(tokenMint: web3.PublicKey): web3.PublicKey {
  return web3.PublicKey.findProgramAddressSync([
    PUMP_CURVE_SEED,
    tokenMint.toBuffer(),
  ], PUMP_PROGRAM_ID)[0];
}
// └──── ➕ ➕ ➕ ➕ ➕ ➕ ➕ ➕ ➕ ➕ ➕ ➕ ➕ ➕ ➕ ────┘

(async (rpcUrl: string) => {

  const conn = new web3.Connection(rpcUrl, "confirmed");

  // ┌──── ➕ ➕ ➕ ➕ ➕ ➕ ➕ ➕ ➕ ➕ ➕ ➕ ➕ ➕ ➕ ────┐
  const tokenMint = new web3.PublicKey("GjSn1XHncttWZtx9u6JB9BNM3QYqiumXfGbtkm4ypump");
  const curveAddress = findPumpCurveAddress(tokenMint);
  // └──── ➕ ➕ ➕ ➕ ➕ ➕ ➕ ➕ ➕ ➕ ➕ ➕ ➕ ➕ ➕ ────┘

  const curveState = await getPumpCurveState(conn, curveAddress);
  if (!curveState) return;

  const tokenPriceSol = calculatePumpCurvePrice(curveState);

  //////////////////////////////////////////////////

  console.log("Token price:");
  console.log(`  ${(tokenPriceSol.toFixed(10))} SOL`);

})(process.env.SOL_RPC_URL || "https://mainnet.helius-rpc.com/?api-key=00000000-0000-0000-0000-000000000000");

This works great! I was searching everywhere for this. thanks!

Thanks for this. Just tested and I can guarantee that the SOL price is correct. Just make sure that you are using the token's bonding curve address and not the token address itself.