Argus Privacy
Argus is a browser extension that inspects crypto wallet signing requests and explains their risk before you approve them. This policy describes exactly what Argus does and does not do with your data. In short: Argus is built to protect you, not to profile you.
What Argus never accesses
- Your private keys or seed phrases. Argus reads the transaction your wallet is about to sign. It never has access to your keys, and it cannot move funds.
- Your identity, email, or any personal account information.
- Your browsing history. Argus only acts on a page when your wallet triggers a signing request there.
Local-first analysis
Argus's rule-based checks (detecting unlimited approvals, drainer patterns, unrecognized contracts, and similar) run entirely inside your browser. No network request is made for this layer.
The optional AI explanation
When an AI explanation is generated, Argus sends a description of the transaction you are about to sign to the Argus backend, which forwards it to Anthropic (the Claude API) to produce a plain-English risk summary. The data sent is limited to:
- The destination contract address, decoded function name and arguments, chain, and native value.
- The hostname of the site that requested the signature.
- The rule-based findings Argus already computed.
This transaction data is used only to generate the explanation in real time. It is not stored on the Argus backend, and it is not used to train models. See Anthropic's policies at anthropic.com/legal/privacy.
What is stored
- In your browser only: a randomly generated, anonymous client identifier (used for usage limits) and, if you subscribe to Pro, your license key. These never leave your device except as described below.
- On the Argus backend: a daily request counter keyed to your anonymous client identifier, used solely to enforce the free daily limit. It contains no transaction content and no personal data.
Third-party services
- Anthropic (Claude): generates the AI explanations.
- Upstash: stores the anonymous daily usage counter.
- LemonSqueezy: validates Pro license keys for subscribers.
What Argus does not do
- No analytics, tracking pixels, advertising, or fingerprinting.
- No selling or sharing of data with anyone for any purpose beyond the functions above.
Permissions
Argus requests access to web pages (<all_urls>) because a wallet signing request can originate on any site. The extension only acts when such a request occurs; it does not read or transmit page content otherwise.
Contact
Questions or requests: pavel@noctis.biz.