You asked about Crypto / Web3
17 people built something like it. 5 are gone.
That is 33% of the ones whose fate we could settle, against 23% across the whole register. 2 were acquired.
| Launched | What it was | Today |
|---|---|---|
| 2021-01-01 | Tools & infra to build and scale high-quality blockchain applications. · quicknode.com | still up |
| 2021-06-01 | YCARQ The global financial platform for affluent consumers in the Americas. · arqfinance.com | still up |
| 2021-01-01 | YCSpruceID SpruceID lets users control their data across the web. · spruceid.com | still up |
| 2021-01-01 | YCStriga Compliant Crypto and Banking Infrastructure · striga.com | acquired |
| 2021-06-01 | The Trading Terminal For Crypto Traders · gethypertrader.com | still up |
| 2021-01-01 | YCFlux Cross border Payments infrastructure for internet businesses and… · iflux.app | still up |
| 2021-06-01 | YCAlgofi Building the new financial system · algofi.org | gone |
| 2021-06-01 | YCCoinrule Coinrule Automates Your Crypto and Stock Investments · coinrule.com | still up |
| 2021-06-01 | YCHedgehog Cryptocurrency Robo-adviser. Buy. Balance. Relax. · hedgehog.app | gone |
| 2021-06-01 | YCSatsuma Reliable blockchain indexing & querying for web3 engineering teams. · satsuma.xyz | acquired |
| 2021-01-01 | Maker of consumer crypto apps: Launchcaster, Frameboard, Maindrop · launchcaster.xyz | gone |
| 2021-01-01 | The solution for fine-grained access control in web3 · slashauth.com | gone |
| 2021-01-01 | YCCamp A Nouns DAO governance client · nouns.camp | still up |
| 2021-06-01 | YCFilta The Face Filter NFT Marketplace · getfilta.com | still up |
| 2021-06-01 | YCLootRush The global operating account you truly deserve. · lootrush.com | still up |
| 2021-06-01 | YCCanopi API to measure and eliminate carbon emissions · canopi.cash | gone |
| 2021-01-01 | YCHapi Stocks and cryptos trading app with zero commissions and no minimums… · hapi.trade | still up |
How this compares
The register re-probes every domain it holds. Some that answered last month stop answering. We send that list — what went quiet, and what it was — once a month. Nothing else.
How this was made. Show HN entries are every post from 2021 to 2023 with at least five points that linked to its own domain; code hosts and free hosting are excluded, because a repository outlives the effort behind it. Product Hunt entries needed 100 votes — a far higher bar, so they are the promoted top slice rather than a like-for-like sample. Both are judged by asking the domain whether it still answers: gone means it no longer resolves, refuses the connection, serves a parking page, or says plainly that it shut down. An HTTP error is not counted as gone — a server answering 404 is one somebody still pays for, and an audit of 25 gone-calls found two such sites alive with only a moved homepage. Y Combinator entries use the status YC publishes itself, which is why only those can say acquired. Squatted domains — a lapsed name now serving somebody else's site — are not detected, so these figures run slightly low.