Invite Code (Beta)

This page covers the client-side prerequisites for the Send API: generating random 12-character base58 invite codes, deriving deterministic Solana secret keys from those codes, and the security requirements for handling invite codes and private keys.

Security

The Send API is designed for transaction building only - it expects and exchanges parameters such as public keys, amounts, and mint addresses. The API does not handle private keys or invite codes for security reasons. All cryptographic operations must be performed client-side:

Invite code generation
Private key derivation from invite codes
Transaction signing

The following sections provide the complete implementation steps required before using the API.

WARNINGCRITICAL SECURITY REQUIREMENTS

Never share invite codes or private keys - treat them like passwords or seed phrases
Store invite codes securely - use encrypted storage, secure vaults, or environment variables
Validate all inputs - ensure invite codes meet expected format before processing
Implement proper error handling - avoid exposing sensitive data in logs or error messages

⚠️ Loss of funds: Any exposure of invite codes or private keys may result in permanent loss of funds. Jupiter is not liable for losses due to compromised credentials.

Overview

Create invite code.

From utils, derive the secret key - a deterministic 64-byte Solana secret key (32 bytes private + 32 bytes public key).

Create Solana Keypair instance from the secret key.

Post request to /craft-send to get the Send transaction.

If /craft-clawback, requires an additional invitePDA to be passed in.

Sign with both sender and recipient keypair, then send transaction and wait for confirmation.

Full Utils Code Snippet

import crypto from "crypto";
import * as ed from "@noble/ed25519";
import { sha512 } from "@noble/hashes/sha512";
const hashFunction = (...messages) => sha512(ed.etc.concatBytes(...messages));
ed.etc.sha512Sync = hashFunction;

const { createHash } = await import("node:crypto");

// This function creates a random 12-character base58 invite code
// Uses 13 random bytes (~1.4 quintillion possible codes)
export async function create_invite_code() {
  const buf = crypto.randomBytes(13);

  // 58^12 = 1.449225352 e21
  return binary_to_base58(new Uint8Array(buf)).substring(0, 12);
};

// This function converts an invite code to a deterministic private key
// Uses SHA256 hash of `"invite:"` + `invite_code` as the seed
// Returns a 64-byte Solana keypair (32 bytes private + 32 bytes public key)
export function invite_code_to_priv_key(invite_code) {
  // Hash the invite code with a prefix
  const pre_hash = "invite:" + invite_code;
  const sha = createHash("sha256");
  const priv_key = crypto.createHash("sha256").update(pre_hash).digest();

  // Use ed25519 to get the public key
  const pub_key = ed.getPublicKey(new Uint8Array(priv_key));
  const solana_priv_key = new Uint8Array(64);
  solana_priv_key.set(priv_key);
  solana_priv_key.set(pub_key, 32);

  return solana_priv_key;
};

/////////////////////////////////////////////////////////////////////////////////////
// Taken from https://github.com/pur3miish/base58-js
const base58_chars =
  "123456789ABCDEFGHJKLMNPQRSTUVWXYZabcdefghijkmnopqrstuvwxyz";
const create_base58_map = () => {
  const base58M = Array(256).fill(-1);
  for (let i = 0; i < base58_chars.length; ++i)
    base58M[base58_chars.charCodeAt(i)] = i;

  return base58M;
};

const base58Map = create_base58_map();
export function binary_to_base58(uint8array) {
  const result = [];

  for (const byte of uint8array) {
    let carry = byte;
    for (let j = 0; j < result.length; ++j) {
      const x = (base58Map[result[j]] << 8) + carry;
      result[j] = base58_chars.charCodeAt(x % 58);
      carry = (x / 58) | 0;
    }
    while (carry) {
      result.push(base58_chars.charCodeAt(carry % 58));
      carry = (carry / 58) | 0;
    }
  }

  for (const byte of uint8array)
    if (byte) break;
    else result.push("1".charCodeAt(0));

  result.reverse();

  return String.fromCharCode(...result);
}

export function base58_to_binary(base58String) {
  if (!base58String || typeof base58String !== "string")
    throw new Error(`Expected base58 string but got “${base58String}”`);
  if (base58String.match(/[IOl0]/gmu))
    throw new Error(
      `Invalid base58 character “${base58String.match(/[IOl0]/gmu)}”`
    );
  const lz = base58String.match(/^1+/gmu);
  const psz = lz ? lz[0].length : 0;
  const size =
    ((base58String.length - psz) * (Math.log(58) / Math.log(256)) + 1) >>> 0;

  return new Uint8Array([
    ...new Uint8Array(psz),
    ...base58String
      .match(/.{1}/gmu)
      .map((i) => base58_chars.indexOf(i))
      .reduce((acc, i) => {
        acc = acc.map((j) => {
          const x = j * 58 + i;
          i = x >> 8;
          return x;
        });
        return acc;
      }, new Uint8Array(size))
      .reverse()
      .filter(
        (
          (lastValue) => (value) =>
            (lastValue = lastValue || value)
        )(false)
      ),
  ]);
}
/////////////////////////////////////////////////////////////////////////////////////

Full Usage Code Snippet

import { create_invite_code, invite_code_to_priv_key } from "./utils.js";
import {
  Connection,
  Keypair,
  VersionedTransaction,
} from "@solana/web3.js";
import fs from "fs";

const connection = new Connection('insert-rpc');
const senderPrivateKey = JSON.parse(fs.readFileSync('/Path/to/sender/id.json', 'utf8').trim());
const sender = Keypair.fromSecretKey(new Uint8Array(senderPrivateKey));

// STEP 1: Create 12-character invite code
const invite_code = await create_invite_code();

// STEP 2: Derive secret key (public and private key)
const secret_key = invite_code_to_priv_key(invite_code);

// STEP 3: Use secret key to create Solana Keypair instance
const recipient = Keypair.fromSecretKey(secret_key);

// STEP 4: Post request for a Send transaction
const craftSendTransaction = await (
    await fetch ('https://api.jup.ag/send/v1/craft-send', {
        method: 'POST',
        headers: {
            'Content-Type': 'application/json',
            'x-api-key': 'your-api-key',
        },
        body: JSON.stringify({
            inviteSigner: recipient.publicKey.toBase58(),
            sender: sender.publicKey.toBase58(),
            amount: "10000000", // atomic amount before decimals
            // mint: "EPjFWdd5AufqSSqeM2qN1xzybapC8G4wEGGkZwyTDt1v", // Defaults to SOL if `mint` is not provided
        }, null, 2)
    })
).json();

// STEP 5: Use sender and receipient keypair to sign and send to network
const transaction = VersionedTransaction.deserialize(Buffer.from(craftSendTransaction.tx, 'base64'));
transaction.sign([sender, recipient]); // SIGN with both SENDER and RECIPIENT keypair
const transactionBinary = transaction.serialize();
const blockhashInfo = await connection.getLatestBlockhashAndContext({ commitment: "confirmed" });

const signature = await connection.sendRawTransaction(transactionBinary, {
  maxRetries: 0,
  skipPreflight: true,
});

// Log the signature immediately after sending, before confirmation
console.log(`Transaction sent: https://solscan.io/tx/${signature}`);

try {
  const confirmation = await connection.confirmTransaction({
    signature,
    blockhash: blockhashInfo.value.blockhash,
    lastValidBlockHeight: blockhashInfo.value.lastValidBlockHeight,
  }, "confirmed");

  if (confirmation.value.err) {
    console.error(`Transaction failed: ${JSON.stringify(confirmation.value.err)}`);
    console.log(`Examine the failed transaction: https://solscan.io/tx/${signature}`);
  } else {
    console.log(`Transaction successful: https://solscan.io/tx/${signature}`);
  };
} catch (error) {
  console.error(`Error confirming transaction: ${error}`);
  console.log(`Examine the transaction status: https://solscan.io/tx/${signature}`);
};

Prerequisite

Dependencies

npm install @solana/web3.js@1 # Using v1 of web3.js instead of v2
npm install dotenv # Useful for testing and handling of invite code and private key
npm install @noble/ed25519
npm install @noble/hashes

Imports

Create a utils file to add these functions

import crypto from "crypto";
import * as ed from "@noble/ed25519";
import { sha512 } from "@noble/hashes/sha512";
import { PublicKey } from "@solana/web3.js";

// Configure the ed25519 library to use SHA-512 for internal operations
// This is REQUIRED before using any ed25519 functions like getPublicKey()
// The library needs to know which hash function to use for key derivation and signing
const hashFunction = (...messages) => sha512(ed.etc.concatBytes(...messages));
ed.etc.sha512Sync = hashFunction;

// Import createHash function from Node.js crypto module using dynamic import
// This allows us to use the modern 'node:crypto' protocol for better compatibility
// createHash is used for SHA-256 hashing in the invite code functions
const { createHash } = await import("node:crypto");

Functions

Create Invite Code

// This function creates a random 12-character base58 invite code
// Uses 13 random bytes (~1.4 quintillion possible codes)
export async function create_invite_code() {
  const buf = crypto.randomBytes(13);

  // 58^12 = 1.449225352 e21
  return binary_to_base58(new Uint8Array(buf)).substring(0, 12);
};

Derive Solana Secret Key

// This function converts an invite code to a deterministic private key
// Uses SHA256 hash of `"invite:"` + `invite_code` as the seed
// Returns a 64-byte Solana secret key (32 bytes private + 32 bytes public key)
export function invite_code_to_priv_key(invite_code) {
  // Hash the invite code with a prefix
  const pre_hash = "invite:" + invite_code;
  const sha = createHash("sha256");
  const priv_key = crypto.createHash("sha256").update(pre_hash).digest();

  // Use ed25519 to get the public key
  const pub_key = ed.getPublicKey(new Uint8Array(priv_key));
  const solana_priv_key = new Uint8Array(64);
  solana_priv_key.set(priv_key);
  solana_priv_key.set(pub_key, 32);

  return solana_priv_key;
};

Convert Binary To Base58

/////////////////////////////////////////////////////////////////////////////////////
// Taken from https://github.com/pur3miish/base58-js
const base58_chars =
  "123456789ABCDEFGHJKLMNPQRSTUVWXYZabcdefghijkmnopqrstuvwxyz";
const create_base58_map = () => {
  const base58M = Array(256).fill(-1);
  for (let i = 0; i < base58_chars.length; ++i)
    base58M[base58_chars.charCodeAt(i)] = i;

  return base58M;
};

const base58Map = create_base58_map();
export function binary_to_base58(uint8array) {
  const result = [];

  for (const byte of uint8array) {
    let carry = byte;
    for (let j = 0; j < result.length; ++j) {
      const x = (base58Map[result[j]] << 8) + carry;
      result[j] = base58_chars.charCodeAt(x % 58);
      carry = (x / 58) | 0;
    }
    while (carry) {
      result.push(base58_chars.charCodeAt(carry % 58));
      carry = (carry / 58) | 0;
    }
  }

  for (const byte of uint8array)
    if (byte) break;
    else result.push("1".charCodeAt(0));

  result.reverse();

  return String.fromCharCode(...result);
}

export function base58_to_binary(base58String) {
  if (!base58String || typeof base58String !== "string")
    throw new Error(`Expected base58 string but got “${base58String}”`);
  if (base58String.match(/[IOl0]/gmu))
    throw new Error(
      `Invalid base58 character “${base58String.match(/[IOl0]/gmu)}”`
    );
  const lz = base58String.match(/^1+/gmu);
  const psz = lz ? lz[0].length : 0;
  const size =
    ((base58String.length - psz) * (Math.log(58) / Math.log(256)) + 1) >>> 0;

  return new Uint8Array([
    ...new Uint8Array(psz),
    ...base58String
      .match(/.{1}/gmu)
      .map((i) => base58_chars.indexOf(i))
      .reduce((acc, i) => {
        acc = acc.map((j) => {
          const x = j * 58 + i;
          i = x >> 8;
          return x;
        });
        return acc;
      }, new Uint8Array(size))
      .reverse()
      .filter(
        (
          (lastValue) => (value) =>
            (lastValue = lastValue || value)
        )(false)
      ),
  ]);
}
/////////////////////////////////////////////////////////////////////////////////////

Send

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Lock

Perps

API Reference

Security

Overview

Prerequisite

Dependencies

Imports

Functions

Create Invite Code

Derive Solana Secret Key

Convert Binary To Base58

​Security

​Overview

​Prerequisite

​Dependencies

​Imports

​Functions

​Create Invite Code

​Derive Solana Secret Key

​Convert Binary To Base58

Security

Overview

Prerequisite

Dependencies

Imports

Functions

Create Invite Code

Derive Solana Secret Key

Convert Binary To Base58