Getting Started with the SDK

pnpm add @leviathan/sdk

pnpm add @solana/web3.js

// Full SVM integration
import { findLoanPda, findPoolPda } from "@leviathan/sdk/svm/pda";
import { buildDepositTx, buildWithdrawTx } from "@leviathan/sdk/svm/transactions";

// Low-level instruction builders
import { depositInstruction, withdrawInstruction } from "@leviathan/sdk/svm/instructions";

// Account types
import type { LoanAccount, PoolAccount } from "@leviathan/sdk/svm/accounts";

import { Connection, PublicKey } from "@solana/web3.js";

const connection = new Connection("https://api.mainnet-beta.solana.com");

import { findLoanPda, findPolicyPda, loanIdBuffer } from "@leviathan/sdk/svm/pda";
import { findPoolPda } from "@leviathan/sdk/svm/pda";

// Derive a loan PDA from the borrower's public key
const borrower = new PublicKey("...");
const [loanPda, loanBump] = findLoanPda(borrower, loanIdBuffer(0));

// Derive the associated policy PDA
const [policyPda, policyBump] = findPolicyPda(loanPda);

// Derive a pool PDA
const admin = new PublicKey("...");
const [poolPda, poolBump] = findPoolPda(admin);

import { Connection, PublicKey } from "@solana/web3.js";
import { findPoolPda } from "@leviathan/sdk/svm/pda";

const connection = new Connection("https://api.mainnet-beta.solana.com");

const admin = new PublicKey("...");
const [poolPda] = findPoolPda(admin);

// Fetch the raw account data
const accountInfo = await connection.getAccountInfo(poolPda);

if (accountInfo) {
  // Deserialize using SDK account types
  console.log("Pool account found:", poolPda.toBase58());
  console.log("Data length:", accountInfo.data.length);
}

import { Connection, PublicKey } from "@solana/web3.js";
import { buildDepositTx } from "@leviathan/sdk/svm/transactions";

const connection = new Connection("https://api.mainnet-beta.solana.com");
const depositor = new PublicKey("...");
const poolPda = new PublicKey("...");

// Build a deposit transaction
const depositAmount = 1_000_000; // in smallest units (e.g., lamports or token base units)
const tx = await buildDepositTx(connection, depositor, poolPda, depositAmount);

// Sign and send (using your wallet adapter or keypair)
// tx is a ready-to-sign Transaction object

import { buildWithdrawTx } from "@leviathan/sdk/svm/transactions";

const withdrawAmount = 500_000;
const tx = await buildWithdrawTx(connection, depositor, poolPda, withdrawAmount);

import { findScoreEntryPda } from "@leviathan/sdk/svm/pda";

const borrower = new PublicKey("...");
const [scoreEntryPda] = findScoreEntryPda(borrower);

const scoreAccount = await connection.getAccountInfo(scoreEntryPda);

if (scoreAccount) {
  console.log("Score entry found for:", borrower.toBase58());
}

import { depositInstruction } from "@leviathan/sdk/svm/instructions";
import { Transaction } from "@solana/web3.js";

// Build individual instructions
const depositIx = depositInstruction(depositor, poolPda, amount, /* ...accounts */);

// Compose into a custom transaction
const tx = new Transaction();
tx.add(depositIx);
tx.feePayer = depositor;
tx.recentBlockhash = (await connection.getLatestBlockhash()).blockhash;