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Scan for outdated or missing drivers - takes under a minuteDriver Scan →Repair Windows errors before they cause bigger problemsFix Now →Do not hand a Polymarket bot a private key or approve a wallet prompt until you know which address will sign, which address will fund trades, what the bot can authorize, and how you can stop it. Polymarket’s documented flow separates wallet signing used to create or derive API credentials from API credentials used to authenticate trade requests. Those are different capabilities, and neither an audit nor a hardware wallet proves that a particular bot is safe.
What does a Polymarket bot actually need?
“The bot needs your key” is not a sufficiently precise explanation. Polymarket documents two authentication layers: L1 uses an EIP-712 wallet signature to create or derive API credentials; L2 uses HMAC-SHA256 signatures made from those credentials for trade API requests. The authentication reference also shows a signer and a funder address in order creation, with supported signature types varying by wallet setup. See Polymarket’s authentication reference.
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A private key is a high-impact secret: someone able to use it to sign can act as that wallet’s signer. API credentials are not automatically harmless; Polymarket says they authenticate trade requests. Before proceeding, ask the operator exactly what the bot stores, what it signs locally, whether it can post or cancel orders, and whether the same secret is used for other accounts or assets.
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- Identify the operator and software. Confirm who maintains the bot, where its code or executable comes from, and whether you can inspect its permissions and configuration. If the operator cannot explain why it needs each credential, stop.
- Write down both addresses. Record the signer address and the funder address. The funder holds the Polymarket funds and may differ from the signing-key address in proxy-wallet setups. Confirm the bot is configured for your actual wallet type. Polymarket’s Python CLOB client documentation describes the signer and funder configuration.
- Check secret storage. Find out where the private key, API key, secret, and passphrase are kept, who can access them, and whether they are transmitted to a hosted service. The client README recommends environment variables for secrets; that is one handling practice, not proof that the bot, server, or host is secure. Do not paste secrets into chat, issue trackers, public repositories, or screenshots. Never provide a seed phrase when the workflow calls only for a private key or API credentials.
- Read each signature and approval prompt. For EOA/MetaMask users, the client README says token allowances must be set before trading. Treat that as a separate authorization step. Before signing an approval, verify the chain, asset, spender, and requested amount. Do not approve a prompt you cannot explain.
- Limit what is exposed. Where practical, use a separate wallet or account funded only with the amount intended for the bot. This is a risk-control recommendation, not a Polymarket feature guarantee. Check both signer and funder addresses; they may not be the same.
- Set operating limits. Decide a maximum position size, a maximum daily loss, and a way to stop the process before enabling automation. These are guardrails for you to configure; the cited Polymarket documentation does not establish that every bot enforces them.
- Observe before trading. If the bot offers read-only or paper mode, first check its market data and configuration there. If you decide a live test is necessary, use only a small amount and personally confirm the order, cancellation, and balance behavior. The client README documents public read-only methods and order management; it does not guarantee how a third-party bot behaves.
- Prepare the stop plan. Before launch, know how to stop the bot, cancel open orders, rotate or revoke API credentials if the relevant mechanism supports it, and review outstanding approvals. Polymarket’s authentication reference documents creating or deriving credentials and revoking builder keys; that does not establish one revocation process for every user API credential or token approval.
Signer, funder, API credentials, and approvals are separate
| Item | What the documentation establishes | What to verify with the bot |
|---|---|---|
| Wallet signer | L1 EIP-712 signing creates or derives API credentials; the client has wallet-specific signature types. | Which wallet signs, where signing occurs, and whether the bot can request further signatures. |
| API credentials | L2 HMAC-SHA256 signatures authenticate trade API requests. | Where credentials are stored, who can use them, and whether they can post or cancel orders. |
| Funder address | The funder holds Polymarket funds and can differ from the signer in proxy-wallet arrangements. | The exact funder address configured and whether it is the account you intend to expose to bot activity. |
| Token allowance | The client README says EOA/MetaMask users must set allowances before trading. | Chain, token, spender, amount, and the current procedure for inspecting or changing the approval. |
The table describes distinct parts of the flow, not a guarantee that a particular bot uses them safely. The official authentication and client documentation are version-sensitive; confirm the exact client version and wallet configuration you will run.
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Does a hardware wallet make an unattended bot safe?
Not by itself. The client README lists hardware wallets among signer types, making the category potentially relevant, but it does not establish that a specific bot supports a given device or can use it for unattended signing. Confirm the exact integration and signing behavior before buying or connecting a device. A hardware wallet does not validate the bot’s code, protect API credentials stored elsewhere, or make a broad token approval safe.
What an audit or security study can—and cannot—tell you
The 2024 proxy-wallet assessment has a defined scope
ChainSecurity’s Code Assessment of the Proxy Wallet Factories Smart Contracts, dated 11 April 2024, covers proxy-wallet factory contracts and a reviewed code version. Its executive overview records two medium findings whose specifications changed. It is not an assessment of an arbitrary trading bot or every current Polymarket component, and ChainSecurity states that an assessment cannot guarantee a system is secure.
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A 2026 preprint reports study-specific transaction findings
The 2026 arXiv preprint The Ghosts of Polymarket: When Off-Chain Matches Meet On-Chain Reverts analyzes reverted match-order transactions and vectors including allowance revocation. In its analyzed dataset, the authors report 1,952,440 reverted match-order transactions, 980,133 filled orders selectively reverted, and estimated profit of $1.49 million. These are findings from that study’s dataset, not measurements of your account, your bot, or current overall platform risk. The preprint says the issue was partially mitigated; that does not establish that every risk is resolved.
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When should you stop?
- The operator cannot explain why each requested credential or permission is needed.
- You cannot identify the signer, funder, or the wallet type the bot is configured to use.
- The bot asks for a seed phrase, or the operator cannot explain where keys and API credentials are stored and who can access them.
- A signature or approval prompt has an unexplained chain, asset, spender, amount, or purpose.
- You cannot determine how to stop the process, cancel its open orders, or follow the applicable credential and approval procedures.
Polymarket’s example EIP-712 message says, “This message attests that I control the given wallet”. Read the actual message and understand what action it authorizes in your setup; do not treat familiar wording as proof that the bot or its requested permissions are safe.
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