Related. Others?

Canarytokens: Honeypot for critical credentials, get notified when they are used (2015) - https://news.ycombinator.com/item?id=41107209 - July 2024 (42 comments)

Canary Tokens - https://news.ycombinator.com/item?id=34157751 - Dec 2022 (59 comments)

A “Safety Net” for AWS Canarytokens - https://news.ycombinator.com/item?id=33644351 - Nov 2022 (1 comment)

Canarytokens - https://news.ycombinator.com/item?id=31914078 - June 2022 (3 comments)

An insanely easy-to-use honeypot solution that deploys in just four minutes - https://news.ycombinator.com/item?id=30374561 - Feb 2022 (4 comments)

Canarytokens – honeypot tokens that tell you when someone used them - https://news.ycombinator.com/item?id=15778011 - Nov 2017 (1 comment)

That’s a really good idea, I love that they even do fake bank cards.

I feel like a self-hosted version would be better though. Having to phone home to their servers could give the game away.

You can totally host it yourself!

https://github.com/thinkst/canarytokens

I think this service is already pretty good, but when defending against LLM based attacks, they're a godsend. Current tools don't appear to be too discerning.

Thanks! We also think they’re one of the few things available that work well for agentic threats.

You might find some recent work we did on agent deception interesting as well: https://blog.thinkst.com/2026/09/getting-agents-to-tell-on-t...

Any idea on how to roll-your-own canary token for an unsupported token provider like Cloudflare/Stripe/OpenAI? Do you just make a real Cloudflare/Stripe/OpenAI account, create an API key, and vibecode an alerting system?

I'm kinda surprised that they haven't expanded beyond their existing token providers.

That's the issue. If the first-parties don't provide a means to mint canaries you have to mint your own real keys.

They make credit cards. Obviously they're not real cards but what sort of financial wizardry is required to make that possible? And given it's vibecoded that means Claude knows how to make fake credit cards now?

>Claude knows how to make fake credit cards now

If by "fake" you mean ones that pass number validation on web sites, that's easy. I wrote python code to check and generate valid numbers back in the '90s; it's a simple, well known check digit algorithm appended at the end. https://en.wikipedia.org/wiki/Luhn_algorithm.

No I mean ones that are actually connected to Visa's network and you get an API call from Visa when someone uses them.

They’re real virtual cards actually. Source: I added the feature

This feature was removed at some point and I guess added back? What happened there? It's my fav feature :).

Also what service do you use to mint endless virtual cc numbers?

The first version used a provider that started rate-limiting us pretty heavily. It meant a pretty crappy experience for folks creating the Canarytoken. We decided to pause and look for alternatives.

We’re using Airwallex now. They’ve been great.

You can read more about the implementation in our blogpost: https://blog.thinkst.com/2024/12/its-baaack-credit-card-cana...

> given it's vibecoded

Why is this a given? This service has been around for longer than LLMs have been a thing.

That would require honesty and trust, which are two things that most online projects could only dream of having

this is absolutely not a given, i've been using canarytokens for years!

blog posts date back to at least 2015: https://leonjza.github.io/blog/2015/09/10/canarytokens---the...

There are many, many services for programmatically issuing credit cards that you can control from code. For example: https://stripe.com/issuing

> given it's vibecoded

I've been using it since 2015