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What signs should you check?
An account takeover and an exposed API key are related but different incidents. Someone may use a stolen key to make API calls without signing in to the web account. Conversely, access to the account may let an intruder view or change multiple keys and settings. OpenAI treats account-security checks and API-key and usage checks separately in its account security guidance.
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Unfamiliar sign-ins or security changes
Review the provider’s security history for events such as sign-ins and sign-outs, password changes, or changes to MFA, passkeys, and other security settings. Compare the event type and time with device and location details where available. OpenAI cautions that device and location information may be approximate or unavailable, so an unfamiliar entry deserves investigation but does not by itself prove an attacker was responsible.
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API calls, usage, or charges you cannot explain
Check whatever usage reporting your provider makes available, including key-, project-, or model-level activity where offered. Look for activity that does not match your team’s work, as well as unexpected spending or provider alerts. There is no universal anomaly threshold or customer-side forensic test established by the cited provider guidance; an unusual charge or request is a reason to investigate, not proof of the source or identity of the user.
#1 Best Overall
- POWERFUL SECURITY KEY: The Security Key C NFC is the essential physical passkey for protecting your digital life from phishing attacks. It ensures only you can access your accounts.
- WORKS WITH 1000+ ACCOUNTS: Compatible with Google, Microsoft, and Apple. A single Security Key C NFC secures 100 of your favorite accounts, including email, password managers, and more.
- FAST & CONVENIENT LOGIN: Plug in your Security Key C NFC via USB-C and tap it, or tap it against your phone (NFC) to authenticate. No batteries, no internet connection, and no extra fees required.
- TRUSTED PASSKEY TECHNOLOGY: Uses the latest passkey standards (FIDO2/WebAuthn & FIDO U2F) but does not support One-Time Passwords. For complex needs, check out the YubiKey 5 Series.
- BUILT TO LAST: Made from tough, waterproof, and crush-resistant materials. Manufactured in Sweden and programmed in the USA with the highest security standards.
OpenAI warns that an exposed API key can permit unauthorized API use and result in charges or activity that violates its terms. Preserve relevant dates, usage details, alert messages, and support correspondence while they are available. The cited sources do not establish a universal refund right, billing-dispute deadline, or guaranteed charge reversal.
A key visible outside its intended secret store
Treat a key found in public code, a shipped app, logs, a build system, or another place not intended for secrets as exposed, even if you cannot see evidence of use. Google Cloud describes API keys as bearer credentials: a stolen authorization key may be used to authenticate as its associated service account. An absence of visible suspicious activity does not prove a key was never copied or used.
Rank #2
- POWERFUL SECURITY KEY: The YubiKey 5C NFC is the most versatile physical passkey, protecting your digital life from phishing attacks. It ensures only you can access your accounts
- WORKS WITH 1000+ ACCOUNTS: Compatible with popular accounts like Google, Microsoft, and Apple. A single YubiKey 5C NFC secures 100+ of your favorite accounts, including email, password managers, and more
- FAST & CONVENIENT LOGIN: Plug in your YubiKey 5C NFC via USB and tap it, or tap it against your phone (NFC), to authenticate. No batteries, no internet connection, and no extra fees required
- MOST SECURE PASSKEY: Supports FIDO2/WebAuthn, FIDO U2F, Yubico OTP, OATH-TOTP/HOTP, Smart card (PIV), and OpenPGP. That means it’s versatile, working almost anywhere you need it
- PRIMARY & SPARE KEYS: Just like having a spare house key, we recommend buying two YubiKeys - one for daily use and one as a spare. That way you’ll never get locked out of your accounts
What to do if an API key may be exposed
- Revoke or delete the affected key. For OpenAI, delete it in the API key dashboard, as described in its security guidance. For Claude, use the API keys page in the Claude Console, following Anthropic’s instructions. Do not delay containment while trying to determine who obtained it.
- Restore any service that depended on the key. If production software needs API access, configure it with a replacement credential stored in an appropriate secret store, then verify the old key is no longer required. Rotation and overlap behavior differs by provider; do not assume the same workflow across platforms.
- Review activity and preserve evidence. Check available usage and billing records for unexpected calls. Save relevant dates, alerts, and visible key or project identifiers, along with the actions you took. Reporting detail and record-retention periods vary by provider.
- Contact the provider through its official support channel. OpenAI directs users to start a new chat on a Help Center page and include details of activity they did not perform or authorize.
- Find the exposure route and limit further access. Check repositories, apps, build and CI logs, configuration, developer machines, and third-party tools. If the exposed credential could access other secrets or systems, assess and replace those downstream credentials as appropriate; Google Cloud’s warning about bearer keys explains why access may extend beyond the key itself.
What to do if the AI account itself may have been accessed
- Change the account password if it may have been exposed, reused, or shared.
- Log out all active sessions, then inspect security history for unfamiliar events. For OpenAI, logging out all devices may take up to 30 minutes to affect other sessions. Enabling MFA alone does not end existing sessions.
- If the account manages API access, review its keys and usage too; account access can put more than one credential or setting at risk.
- Contact the provider with concrete details of activity you did not perform or authorize.
- Secure linked email and identity-provider accounts if they share a password, recovery route, or active session with the affected account. Steps for those external accounts depend on their providers.
How to reduce the chance of another exposure
- Use a unique, strong account password and enable MFA. MFA adds a sign-in verification step, but it is not a replacement for revoking a leaked API key.
- Keep server-side API keys in environment variables or a secret manager. For GitHub Actions, OpenAI recommends GitHub secrets. Do not embed a secret key in a mobile app or other client software shipped to users.
- Review code before publishing and use automated secret scanning to catch accidental leaks.
- Use separate keys for projects, teams, features, or products where possible. This makes activity easier to trace and can limit the scope of a single exposed key.
- Set spending thresholds and monitor activity. OpenAI notes that enforcement of a hard limit is not instantaneous, so recorded spend can slightly exceed it; do not treat a limit as guaranteed prevention of every charge.
- For Google Cloud, assess whether IAM policies or short-lived service-account credentials are a better fit than API keys. Google documents an exception for Gemini API authorization keys in production, so check the current guidance for the specific service before changing authentication.
When comparing providers, check what security history is visible, whether sessions can be reviewed and revoked, how quickly keys can be revoked and replaced, whether usage can be attributed to keys or projects, how spending alerts and hard limits behave, and what support and evidence-retention options are available. These controls vary, so do not assume one provider’s dashboard or response times apply to another.
Quick Recap
Best Value
- POWERFUL SECURITY KEY: The YubiKey 5 is a versatile physical passkey that protects your digital life from phishing attacks. It ensures only you can access your accounts.
- WORKS WITH 1000+ ACCOUNTS: Compatible with popular accounts like Google, Microsoft, and Apple. A single YubiKey 5 secures 100+ of your favorite accounts, including email, password managers, and more.
- FAST & CONVENIENT LOGIN: Plug in your YubiKey 5 via USB and tap it to authenticate. No batteries, no internet connection, and no extra fees required.
- MOST SECURE PASSKEY: Supports FIDO2/WebAuthn, FIDO U2F, Yubico OTP, OATH-TOTP/HOTP, Smart card (PIV), and OpenPGP. That means it’s versatile, working almost anywhere you need it.
- BUILT TO LAST: Made from tough, waterproof, and crush-resistant materials. Manufactured in Sweden and programmed in the USA with the highest security standards.
Rank #4
- POWERFUL SECURITY KEY: The Security Key NFC is the essential physical passkey for protecting your digital life from phishing attacks. It ensures only you can access your accounts.
- WORKS WITH 1000+ ACCOUNTS: Compatible with Google, Microsoft, and Apple. A single Security Key NFC secures 100 of your favorite accounts, including email, password managers, and more.
- FAST & CONVENIENT LOGIN: Plug in your Security Key NFC via USB-A and tap it, or tap it against your phone (NFC) to authenticate. No batteries, no internet connection, and no extra fees required.
- TRUSTED PASSKEY TECHNOLOGY: Uses the latest passkey standards (FIDO2/WebAuthn & FIDO U2F) but does not support One-Time Passwords. For complex needs, check out the YubiKey 5 Series.
- BUILT TO LAST: Made from tough, waterproof, and crush-resistant materials. Manufactured in Sweden and programmed in the USA with the highest security standards.
Rank #3
- POWERFUL SECURITY KEY: The YubiKey 5 NFC is the most versatile physical passkey, protecting your digital life from phishing attacks. It ensures only you can access your accounts
- WORKS WITH 1000+ ACCOUNTS: Compatible with popular accounts like Google, Microsoft, and Apple. A single YubiKey 5 NFC secures 100+ of your favorite accounts, including email, password managers, and more
- FAST & CONVENIENT LOGIN: Plug in your YubiKey 5 NFC via USB and tap it, or tap it against your phone (NFC), to authenticate. No batteries, no internet connection, and no extra fees required
- MOST SECURE PASSKEY: Supports FIDO2/WebAuthn, FIDO U2F, Yubico OTP, OATH-TOTP/HOTP, Smart card (PIV), and OpenPGP. That means it’s versatile, working almost anywhere you need it
- PRIMARY & SPARE KEYS: Just like having a spare house key, we recommend buying two YubiKeys - one for daily use and one as a spare. That way you’ll never get locked out of your accounts
Sources
- OpenAI Help Center: Keeping your OpenAI account secure
- Google Cloud Documentation: Best practices for managing API keys
- Anthropic Claude Help Center: What should I do if I suspect my API key has been compromised?
- AWS re:Post: Resolve issues with unauthorized activity in AWS accounts
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