starkzap-sdk

name	starkzap-sdk
description	Reference for integrating or maintaining applications built with keep-starknet-strange/starkzap, including StarkSDK setup, onboarding, wallet lifecycle, sponsored transactions, ERC20 flows, staking, and transaction builder usage.
license	Apache-2.0
metadata	{"author":"keep-starknet-strange","version":"1.0.0","org":"keep-starknet-strange"}
compatibility	Node.js 20+, TypeScript 5+, starkzap repository workflows
keywords	["starknet","starkzap","sdk","typescript","onboarding","wallet","privy","cartridge","paymaster","erc20","staking","tx-builder"]
allowed-tools	["Bash","Read","Write","Glob","Grep","Task"]
user-invocable	true

Starkzap SDK

Project-focused guide for https://github.com/keep-starknet-strange/starkzap.

Use this skill when requests involve Starkzap SDK code, examples, or docs.

When to Use

Trigger for tasks like:

• "Add a new onboarding flow in Starkzap"
• "Fix sponsored transaction behavior in wallet.execute"
• "Update staking pool logic or validator presets"
• "Patch Privy signer/server integration"
• "Review Starkzap tests/docs/examples"

When NOT to Use

• Generic Starknet SDK work outside the Starkzap codebase.
• Cairo contract authoring, deployment operations, or security audits.

Quick Start

1. Open the target Starkzap repository paths below and choose the smallest workflow surface first.
2. Use skills catalog when the task crosses into generic Starknet wallet, deployment, or audit flows.

Repository Map

Primary implementation:

• src/sdk.ts - top-level orchestration (StarkSDK)
• src/wallet/* - wallet implementations and lifecycle
• src/signer/* - StarkSigner, PrivySigner, signer adapter
• src/tx/* - Tx and TxBuilder
• src/erc20/* - token helpers, balance/transfer logic
• src/staking/* - staking operations and pool discovery
• src/types/* - shared domain types (Address, Amount, config)

Operational and docs:

• tests/* and tests/integration/*
• examples/web, examples/server, examples/mobile, examples/flappy-bird
• scripts/* for generated artifacts in the Starkzap repo
• docs/* and mintlify-docs/*

Skill resources:

• skills/starkzap-sdk/references/signer-integration.md - signer trust boundaries and auth assumptions
• skills/starkzap-sdk/references/sponsored-transactions.md - paymaster flow and fee mode behavior
• skills/starkzap-sdk/references/erc20-helpers.md - Amount semantics and transfer patterns
• skills/starkzap-sdk/references/staking-reliability.md - pool discovery and timeout/abort safety
• skills/starkzap-sdk/scripts/wallet-execute-example.ts - wallet readiness and execute flow
• skills/starkzap-sdk/scripts/staking-pool-discovery.ts - staking pool discovery and diagnostics

Quick Reference

Common starknet.js patterns (provider/account/call/execute/listen):

import { Account, Contract, RpcProvider } from "starknet";

const provider = await RpcProvider.create({
  nodeUrl: process.env.RPC_URL!,
});

const account = new Account({
  provider,
  address: process.env.ACCOUNT_ADDRESS!,
  signer: process.env.PRIVATE_KEY!,
  cairoVersion: "1",
});

const contract = new Contract({
  abi,
  address: process.env.CONTRACT_ADDRESS!,
  providerOrAccount: account,
});
await contract.call("balance_of", [account.address]); // read

const tx = await account.execute([
  {
    contractAddress: process.env.CONTRACT_ADDRESS!,
    entrypoint: "do_work",
    calldata: [],
  },
]);
await provider.waitForTransaction(tx.transaction_hash);

// With Starkzap Tx wrapper
const submitted = await wallet.execute(calls, { feeMode: "user_pays" });
const stop = submitted.watch(
  ({ finality, execution }) => console.log(finality, execution),
  { pollIntervalMs: 5000, timeoutMs: 120000 }
);
// stop(); // call to unsubscribe early

Common error classes and immediate recovery:

Error Class	Typical Signal	Immediate Recovery
VALIDATION_ERROR	Invalid token decimals, Amount.parse(...) failure	Re-check token decimals/symbol, parse from known token preset, avoid mixing token types.
UNDEPLOYED_ACCOUNT	Account is not deployed on wallet.execute(...)	Run wallet.ensureReady({ deploy: "if_needed" }) before user_pays writes.
RPC_OR_NETWORK	timeout, 429, provider mismatch	Retry with backoff, confirm rpcUrl and chainId, switch to stable RPC for production.
TX_REVERTED	preflight.ok === false or reverted receipt	Run wallet.preflight({ calls }), inspect reason, reduce batch size, verify call ordering.
AUTH_OR_PERMISSION	Privy 401/403, invalid signature response	Verify signer server auth, headers/body resolver, and trusted serverUrl.

See also:

• skills/starkzap-sdk/references/* for implementation-specific troubleshooting
• skills/starkzap-sdk/scripts/* for runnable diagnostic examples

Core Workflows

1) Configure StarkSDK and Connect Wallets

Common API path:

1. Instantiate StarkSDK with network or rpcUrl + chainId.
2. Use sdk.onboard(...) or sdk.connectWallet(...).
3. Call wallet.ensureReady({ deploy: "if_needed" }) before user-pays writes.

Supported onboarding strategies:

• OnboardStrategy.Signer
• OnboardStrategy.Privy
• OnboardStrategy.Cartridge

For Cartridge:

• Treat as web-only runtime.
• Expect popup/session behavior and policy scoping requirements.

import {
  ChainId,
  OnboardStrategy,
  StarkSDK,
  StarkSigner,
} from "starkzap";

const sdk = new StarkSDK({ network: "sepolia" });

const customSdk = new StarkSDK({
  rpcUrl: process.env.RPC_URL!,
  chainId: ChainId.SEPOLIA,
});

const signerResult = await sdk.onboard({
  strategy: OnboardStrategy.Signer,
  account: { signer: new StarkSigner(process.env.PRIVATE_KEY!) },
  feeMode: "user_pays",
  deploy: "if_needed",
});

const privyResult = await sdk.onboard({
  strategy: OnboardStrategy.Privy,
  privy: {
    resolve: async () => ({
      walletId: process.env.PRIVY_WALLET_ID!,
      publicKey: process.env.PRIVY_PUBLIC_KEY!,
      serverUrl: process.env.PRIVY_SIGNER_URL!,
    }),
  },
  feeMode: "sponsored",
});

const cartridgeResult = await sdk.onboard({
  strategy: OnboardStrategy.Cartridge,
  cartridge: {
    preset: "controller",
    policies: [{ target: "0xPOOL", method: "stake" }],
  },
});

const wallet = await sdk.connectWallet({
  account: { signer: new StarkSigner(process.env.PRIVATE_KEY!) },
  feeMode: "sponsored",
});

await wallet.ensureReady({ deploy: "if_needed" });

2) Execute Transactions (wallet.execute, wallet.preflight, wallet.tx)

Use:

• wallet.execute(calls, options) for direct execution.
• wallet.preflight({ calls, feeMode }) for simulation checks.
• wallet.tx() (TxBuilder) for batched operations with deterministic ordering.

const calls = [
  {
    contractAddress: process.env.CONTRACT_ADDRESS!,
    entrypoint: "do_work",
    calldata: [],
  },
];

const preflight = await wallet.preflight({
  calls,
  feeMode: "user_pays",
});
if (!preflight.ok) {
  throw new Error(`Preflight failed: ${preflight.reason}`);
}

const userPaysTx = await wallet.execute(calls, { feeMode: "user_pays" });
await userPaysTx.wait();

const sponsoredTx = await wallet.execute(calls, { feeMode: "sponsored" });
await sponsoredTx.wait();

const batchedTx = await wallet
  .tx()
  .add(...calls)
  .send({ feeMode: "sponsored" });
await batchedTx.wait();

function getSdkErrorClass(error: unknown): string {
  const message = error instanceof Error ? error.message : String(error);
  if (message.includes("not deployed")) return "UNDEPLOYED_ACCOUNT";
  if (message.includes("timed out") || message.includes("429")) {
    return "RPC_OR_NETWORK";
  }
  if (message.includes("signature") || message.includes("Privy")) {
    return "AUTH_OR_PERMISSION";
  }
  if (message.includes("Invalid") || message.includes("Amount")) {
    return "VALIDATION_ERROR";
  }
  return "UNKNOWN";
}

try {
  await wallet.execute(calls, { feeMode: "user_pays" });
} catch (error) {
  const kind = getSdkErrorClass(error);
  if (kind === "UNDEPLOYED_ACCOUNT") {
    await wallet.ensureReady({ deploy: "if_needed" });
  }
  throw error;
}

When changing execution behavior:

• Audit deploy vs execute path for undeployed accounts.
• Verify runtime constraints (OnboardStrategy.Cartridge is web-only).
• Cover both user_pays and sponsored branches in tests.

3) ERC20 and Staking Scope

ERC20 notes (starkzap-sdk internal token operations, no avnu required):

• Validate Amount with the token preset used for the call.
• Keep multicall ordering explicit for batched transfers.

import { Amount } from "starkzap";

const usdcAmount = Amount.parse("25", USDC);

try {
  const tx = await wallet
    .tx()
    .transfer(USDC, [
      { to: recipientA, amount: usdcAmount },
      { to: recipientB, amount: Amount.parse("5", USDC) },
    ])
    .send({ feeMode: "user_pays" });
  await tx.wait();
} catch (error) {
  // Re-parse Amount from the expected token preset before retrying.
  throw error;
}

Staking notes (starkzap-specific staking flows):

• Membership-sensitive operations: enter, add, exit intent, exit.
• Validate staking config and chain presets before execution.
• Verify timeout/abort behavior where pool resolution is involved.

For general DeFi operations (swaps, DCA, lending) and STRK staking via the avnu aggregator, use the starknet-defi skill.

4) Examples + Integration Surfaces

Check for drift between:

• examples/web/main.ts
• examples/server/server.ts
• README and docs links

Specifically verify endpoint and auth consistency for Privy + paymaster proxy flows.

Guardrails

Do not hand-edit generated files:

• src/erc20/token/presets.ts
• src/erc20/token/presets.sepolia.ts
• src/staking/validator/presets.ts
• src/staking/validator/presets.sepolia.ts
• docs/api/**
• docs/export/**

Regenerate with scripts:

npm run generate:tokens
npm run generate:tokens:sepolia
npm run generate:validators
npm run generate:validators:sepolia
npm run docs:api
npm run docs:export

Keep API export changes explicit:

• If new public API is added/removed, update src/index.ts.

Validation Checklist

Run minimal set first:

npm run typecheck
npm test

Run broader checks when behavior is cross-cutting:

npm run build
npm run test:all

Integration tests may require local devnet/fork setup:

npm run test:integration

If not run, clearly report why.

Error Codes & Recovery

Map observed errors to actionable recovery:

Error Class	Typical Trigger	Recovery Steps
VALIDATION_ERROR	Amount.parse(...)/token mismatch, malformed address, invalid config	Confirm token decimals/symbol, re-create Amount from known token presets, validate config against src/types/* and src/sdk.ts.
RPC_OR_NETWORK	RPC timeout, 429, transient JSON-RPC failures, chain mismatch	Retry with exponential backoff, check rpcUrl/chainId, verify provider health, reduce batch size for retries.
TX_REVERTED	wallet.preflight(...) fails or receipt is reverted	Run wallet.preflight({ calls, feeMode }) first, inspect revert reason, reorder calls in wallet.tx(), split large multicalls.
RATE_LIMIT_OR_TIMEOUT	tx.watch timeout, stalled polling, pool resolution timeout	Increase timeout where appropriate, add abort handling, retry on fresh provider session, avoid parallel heavy queries.
AUTH_OR_PERMISSION	Privy signing errors, 401/403, invalid signature payloads	Verify signer server auth headers/body, validate trusted serverUrl, check examples/server/server.ts auth middleware alignment.
UNDEPLOYED_ACCOUNT	wallet.execute(..., { feeMode: "user_pays" }) on undeployed account	Run wallet.ensureReady({ deploy: "if_needed" }), then retry execution; use sponsored mode only when paymaster path is configured.
GENERATED_ASSET_DRIFT	Preset/docs changes diverge from source of truth	Regenerate via npm run generate:tokens, npm run generate:tokens:sepolia, npm run generate:validators, npm run generate:validators:sepolia, npm run docs:api, npm run docs:export.

If a fix is uncertain:

• Reproduce with the closest example in examples/*.
• Capture command, environment, and failing test IDs.
• Report exact file/path + remediation attempted.

Useful Task Patterns

• Bug fix in wallet lifecycle:

  • inspect src/wallet/index.ts, src/wallet/utils.ts
  • patch
  • update tests/wallet*.test.ts

• Privy auth/signature issue:

  • inspect src/signer/privy.ts
  • align with examples/server/server.ts
  • update tests/privy-signer.test.ts

• Staking regression:

  • inspect src/staking/staking.ts, src/staking/presets.ts
  • add/adjust integration assertions in tests/integration/staking.test.ts

Example Prompt

"Use this skill to fix Starkzap sponsored execution for undeployed accounts, add tests, and list behavior changes."