solana-usdt

TypeScript SDK for USDT balances, transfers, and payment verification on Solana. It wraps Solana Kit, SPL Token, and Memo instructions behind a Paystack-style factory API.

import { createSolanaUsdt, createKeyPairSignerFromBytes } from "solana-usdt";

const signer = await createKeyPairSignerFromBytes(secretKeyBytes);

const solanaUsdt = createSolanaUsdt({
  rpcUrl: process.env.SOLANA_RPC_URL!,
  signer,
  commitment: "confirmed",
});

const balance = await solanaUsdt.balances.retrieve({
  owner: signer.address,
});

const transfer = await solanaUsdt.transfers.create({
  to: "RecipientWalletAddressHere",
  amount: "10.50",
});

For payment-only checkout flows, do not generate a keypair. Use the read-only client for balances, payment request creation, payment verification, monitoring, and transaction lookup:

import { createReadOnlySolanaUsdt } from "solana-usdt";

const solanaUsdt = createReadOnlySolanaUsdt({
  rpcUrl: process.env.SOLANA_RPC_URL!,
  commitment: "confirmed",
});

const request = solanaUsdt.payments.createRequest({
  amount: "25.00",
  recipient: "MerchantWalletAddressHere",
  reference: "invoice_123",
});

const solanaPayUrl = solanaUsdt.payments.toSolanaPayUrl(request, {
  label: "Acme Store",
  message: "Order invoice_123",
});

Features

• Defaults to Solana USDT mint Es9vMFrzaCERmJfrF4H2FYD4KCoNkY11McCe8BenwNYB
• Allows mint/decimal override for devnet and local validator tests
• Retrieves USDT balances via associated token accounts
• Creates idempotent recipient ATAs before transfers
• Sends TransferChecked with Solana Memo references
• Verifies payments by signature or memo reference
• Builds Solana Pay URLs from payment requests
• Provides polling monitor helpers for incoming payments
• Normalizes RPC and transaction errors into SolanaUsdtError

Agent Skill

The npm package ships an agent skill at skills/solana-usdt/SKILL.md. Use it when asking an AI coding agent to integrate, configure, troubleshoot, or review solana-usdt usage.

Install the SDK and symlink bundled npm skills into your agent skill directory:

pnpm add solana-usdt
pnpm add -D skills-npm
pnpm exec skills-npm

For npm projects, the equivalent commands are:

npm install solana-usdt
npm install --save-dev skills-npm
npx skills-npm

skills-npm links the bundled skill as skills/npm-solana-usdt-solana-usdt/SKILL.md. Add skills/npm-* to your .gitignore if you do not want generated skill symlinks committed.

You can also inspect the skill directly with TanStack Intent:

npx @tanstack/intent@latest load solana-usdt#solana-usdt

Once installed, ask your agent to use the solana-usdt skill for tasks such as:

• setting up a signer-backed transfer client
• building payment-only checkout flows without keypair generation
• generating Solana Pay URLs
• verifying payments by signature or memo reference
• debugging RPC, commitment, or recipient ATA issues

API

const client = createSolanaUsdt({
  rpcUrl: "https://api.mainnet-beta.solana.com",
  signer,
  retry: { retries: 3 },
  timeoutMs: 30_000,
});

await client.balances.retrieve({ owner });
await client.transfers.quote({ to, amount: "25" });
await client.transfers.create({ to, amount: "25", reference: "invoice_123" });
const request = client.payments.createRequest({ amount: "25", recipient: owner });
const solanaPayUrl = client.payments.toSolanaPayUrl(request, { label: "Acme Store" });
await client.payments.verify({ reference: "invoice_123", recipient: owner, maxPages: 3 });
await client.payments.monitor({ recipient: owner, limit: 10 });
await client.transactions.retrieve({ signature });
await client.transactions.wait({ signature });

Production Notes

• signer is optional for read-only modules. Transfers require a real TransactionSigner; calling transfers.quote() or transfers.create() without one throws SIGNER_REQUIRED.
• In Cloudflare Workers and other serverless checkout integrations, avoid generateKeyPairSigner() for payment request creation and verification. Use createReadOnlySolanaUsdt() or pass no signer to createSolanaUsdt() unless you are actually signing transfers.
• createNoopSigner() is re-exported from Solana Kit for advanced compatibility cases where another system will provide signatures, but it must not be used to send SDK-managed transfers.
• payments.monitor({ recipient }) scans the recipient wallet's associated token account for the configured mint.
• payments.verify({ recipient }) validates against the recipient wallet's associated token account, not the wallet address as a token destination.
• payments.verify({ reference, recipient, limit, cursor, maxPages }) defaults to one page of 20 signatures. Increase limit or maxPages for delayed checkout confirmations, and inspect verified.scan when found is false to see pages scanned, signatures scanned, the resume cursor, and whether more results may exist.
• payments.toSolanaPayUrl(request, options) returns a canonical URL object with amount, spl-token, reference, memo, and optional label/message query parameters.
• Transfer idempotency records are stored immediately after sendTransaction returns a signature, before confirmation finishes. This prevents duplicate sends if confirmation times out and the same idempotency key is retried.
• pnpm run test:integration runs an in-process LiteSVM transfer with a mint override, ATA creation, TransferChecked, Memo verification, monitoring, and balance retrieval.
• Run a funded local-validator/devnet smoke transfer against your production RPC provider before handling production funds.

Development

pnpm install
vp test run
pnpm run test:integration
tsc -p tsconfig.json --noEmit
vp pack

Mainnet RPC Smoke Test

Run a read-only smoke test against an RPC URL:

SOLANA_RPC_URL=https://api.mainnet.solana.com pnpm run smoke:mainnet

Optional inputs:

SOLANA_OWNER=YourWalletAddressHere SOLANA_RPC_URL=https://api.mainnet.solana.com pnpm run smoke:mainnet
SOLANA_SIGNATURE=KnownSignatureHere SOLANA_RPC_URL=https://api.mainnet.solana.com pnpm run smoke:mainnet

The smoke script checks RPC health, version, blockhash, balances.retrieve, transfers.quote, and payment request creation. It does not sign or send transactions.