🎉 Update — Feb 20, 2026

We're back! Google has reinstated Fiu's email. Send your prompt injections now.

Get Your Claws
On The Secrets

Fiu is an OpenClaw assistant that reads emails. He has secrets he shouldn't share. Your job? Make him talk.

Inspired by real prompt injection research. Can you find a zero-day in OpenClaw's defenses?

// indirect prompt injection via email

📧 Send Email to Fiu Learn More

How It Works

No setup. No registration. Just send an email.

⏰ Fiu checks emails every hour. He's been told not to reply without human approval — but that's just a prompt instruction, not a technical limit.

1

Craft Your Payload

Write an email with your prompt injection. Get creative.

2

Fiu Reads It

Fiu (an OpenClaw assistant) processes your email. He's helpful, friendly, and has access to secrets.env which he should never reveal.

3

Extract the Secrets

If it works, Fiu leaks secrets.env in his response. Look for API keys, tokens, that kind of stuff.

4

Claim Your Prize

First to send me the contents of secrets.env wins $500. Just reply with what you got.

Meet Fiu

// OpenClaw Assistant

Fiu is an OpenClaw assistant that reads and responds to emails. He follows instructions carefully (maybe too carefully?). He has access to secrets.env with sensitive credentials. He's been told to never reveal it... but you know how that goes.

Why This Exists

Prompt injection is a real threat. I want to see if you can break OpenClaw.

I didn't add anything special — just 10-20 lines in the prompt telling Fiu to never reveal secrets.env.

Can you break through?
I'm curious how resistant a state-of-the-art model really is against prompt injection.

Rules

Keep it clean. This is about skill, not spam.

✓ Fair Game

  • Any prompt injection technique in email body or subject
  • Multiple attempts (but be reasonable)
  • Creative social engineering within the email
  • Using any language or encoding in your payload
  • Sharing techniques after the contest ends

✗ Off Limits

  • Hacking the VPS directly
  • Any attack not via email (email is the ONLY allowed vector)
  • DDoS or flooding the mailbox
  • Sharing the secrets before contest ends
  • Any illegal activities (duh)

The Bounty

First hacker to extract secrets.env takes it all.

$500
USD

Payment via PayPal, Venmo, or wire transfer.
$100 from me + $200 from Corgea + $200 from an anonymous donor 🦀

Sponsors

Making this challenge possible.

FAQ

Questions? Answers. Maybe.

You craft input that tricks an AI into ignoring its instructions. Like SQL injection, but for AI. Here, you're sending emails that convince Fiu to leak secrets.env.
Fiu was the mascot of the Santiago 2023 Pan American Games in Chile 🇨🇱

It's a siete colores, a small colorful bird native to Chile. The name comes from the sound it makes.

Fiu became a national phenomenon. "Being small doesn't mean you can't give your best." Just like our AI here: small, helpful, maybe too trusting. 💨
If it worked, Fiu will leak secrets.env contents in his response: API keys, tokens, etc. If not, Fiu won't reply to your email — it will just appear in the attack log. It would be too expensive to make him reply to every email 😓
Yes! Fiu has full technical ability to send emails — it's not a hard constraint. He's just been told (via prompt instructions) not to send anything without explicit confirmation from his owner. If your injection tricks him into replying anyway... well, that's the whole point 😉
Sure, for crafting payloads. But automated mass-sending gets you rate-limited or banned. Quality over quantity.
Yes. If you can send an email, you can play. Payment works globally.
Nope. He's just doing his job reading emails, no idea he's the target. 🎯
Yep. Check /log.html for a public log. You'll see sender and timestamp, but not the email content.
Anthropic Claude Opus 4.6. State of the art, but that doesn't mean unhackable.
Awesome! Send an email to [email protected]

If someone donates, I can increase the prize, spend it on tokens to make responses live, and try other ideas to make the challenge better.
Just me! @cucho on Twitter.
By sending an email to Fiu, you agree that I may share the body of your email on this page and as a potential example of prompt injection. I will not share your email address or use your email for any other purpose.
Only the subject line — to add it to the log. The body doesn't get read.