investing, writing, building
San Francisco, CA
Joined April 2024
- Tweets 3,542
- Following 1,089
- Followers 3,753
- Likes 4,946
Ruben Dominguez Ibar retweeted
Marc Andreessen says the best startup ideas don’t seem smart. They seem insane.
That’s why big companies don’t touch them. That’s also why they work.
“Breakthrough ideas often seem crazy at first, and that craziness can be a good sign.”
"The average age of YC founders had been holding steady around ~29 years since 2015, but now it stands at ~26 years and falling"
Interesting!
I just published On the ‘new’ Y Combinator medium.com/p/on-the-new-y-co…
which one is your favourite?
📈 Prediction markets trading volumes are exploding.
What was once a niche for crypto insiders is now turning into one of the fastest-growing markets in fintech
And the biggest surprise?
A year ago, Polymarket completely dominated the space — 40 million visits versus just 2 million for Kalshi.
Now, Kalshi is staging one of the most impressive comebacks in tech.
They have just surpassed Polymarket in total trade volume.
According to Crustdata:
▫️ September 2024 → Polymarket 533M | Kalshi 21M
▫️ October 2025 → Polymarket 4.0B | Kalshi 4.4B
That is a complete reversal in only twelve months:
where do you think this is going?
choose your fighter 👀
📈 Prediction markets trading volumes are exploding.
What was once a niche for crypto insiders is now turning into one of the fastest-growing markets in fintech
And the biggest surprise?
A year ago, Polymarket completely dominated the space — 40 million visits versus just 2 million for Kalshi.
Now, Kalshi is staging one of the most impressive comebacks in tech.
They have just surpassed Polymarket in total trade volume.
According to Crustdata:
▫️ September 2024 → Polymarket 533M | Kalshi 21M
▫️ October 2025 → Polymarket 4.0B | Kalshi 4.4B
That is a complete reversal in only twelve months:
where do you think this is going?
the market is in 🔥
📈 Prediction markets trading volumes are exploding.
What was once a niche for crypto insiders is now turning into one of the fastest-growing markets in fintech
And the biggest surprise?
A year ago, Polymarket completely dominated the space — 40 million visits versus just 2 million for Kalshi.
Now, Kalshi is staging one of the most impressive comebacks in tech.
They have just surpassed Polymarket in total trade volume.
According to Crustdata:
▫️ September 2024 → Polymarket 533M | Kalshi 21M
▫️ October 2025 → Polymarket 4.0B | Kalshi 4.4B
That is a complete reversal in only twelve months:
where do you think this is going?
where do you see the market going? 🫣
📈 Prediction markets trading volumes are exploding.
What was once a niche for crypto insiders is now turning into one of the fastest-growing markets in fintech
And the biggest surprise?
A year ago, Polymarket completely dominated the space — 40 million visits versus just 2 million for Kalshi.
Now, Kalshi is staging one of the most impressive comebacks in tech.
They have just surpassed Polymarket in total trade volume.
According to Crustdata:
▫️ September 2024 → Polymarket 533M | Kalshi 21M
▫️ October 2025 → Polymarket 4.0B | Kalshi 4.4B
That is a complete reversal in only twelve months:
where do you think this is going?
📈 Prediction markets trading volumes are exploding.
What was once a niche for crypto insiders is now turning into one of the fastest-growing markets in fintech
And the biggest surprise?
A year ago, Polymarket completely dominated the space — 40 million visits versus just 2 million for Kalshi.
Now, Kalshi is staging one of the most impressive comebacks in tech.
They have just surpassed Polymarket in total trade volume.
According to Crustdata:
▫️ September 2024 → Polymarket 533M | Kalshi 21M
▫️ October 2025 → Polymarket 4.0B | Kalshi 4.4B
That is a complete reversal in only twelve months:
where do you think this is going?
Ruben Dominguez Ibar retweeted
💸 The $1 Trillion Bet on Elon Musk
Tesla shareholders just approved the biggest corporate payout ever to keep Musk focused on turning Tesla into an AI and robotics empire.
It’s chips, humanoids, and the race to build machines that think and move like us.
Ruben Dominguez Ibar retweeted
Start a business at 19 → Facebook
Start at 36 → LinkedIn
Start at 49 → Ryanair
Start at 60 → Bank of America
Start at 61 → IBM
It’s never too early. It’s never too late.
Credit: Philippe Roche
“Do the opposite of the EU”
Do you agree with @pmarca and @DavidSacks?
🦅 If AI sneezes, the US Market catches a cold
Tech stocks now make up 36% of the S&P 500, an even higher weight than during the dot-com boom.
Add Amazon, Meta, Tesla, and Alphabet, and nearly half of the index is tied to tech.
If AI spending slows, how much air is left in this rally?
masterclass 👇
[EXPLAINING THE CLUELY PIVOT (+ A BRIEF HISTORY)]
9 months ago, i built Interview Coder, an undetectable translucent desktop overlay that lets you cheat on leetcode interviews.
i knew it had viral potential, and posted about it constantly until I did go viral.
then I did it again. and again and again.
and then it made me ~$1 million dollars in profit. holy fuck!
apparently you can build a gpt wrapper, go hella viral, and become a millionaire.
could I do it again, but bigger?
so, I started cluely with 2 big questions:
> where else could this overlay be useful outside of leetcode interviews?
> can I keep getting this much attention?
the second answer came immediately. yes, I am very good at getting attention.
and thanks to the attention, we got hundreds of thousands of users ridiculously quick, and were able to use the data to figure out that our stickiest power users were using it in meetings.
so we just built for that.
the deeper learning, though, is that we seem to have cracked the formula for organic virality.
no other tech startup has ever been able to do it this reliably or at this scale.
it’s really not luck, and most importantly, if done right, it works to grow companies.
interview coder proved it, and cluely continues to prove it, growing faster than ever in a “saturated” space.
the world is vast.
there are tens of millions of people in meetings every day, and 90% of them don't know what an ai notetaker is.
the market is big enough that you can be the most controversial person in the world and still win, as long as you can deliver the magic moment to the user.
