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Sem_pre

HN member
Joined
Tue, Jan 20, 2026, 5:20 PM UTC
HN karma
6
Public activity
13 items

About Sem_pre

Solo founder building dev tools and Web3 infrastructure. Currently: PayWatcher (paywatcher.dev) — stablecoin payment verification API. Based in Austria. masem.at

Recent public activity

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    Ask HN: What are you using for DAO gov data after Tally (tally.xyz) shuts down?

    Tally (tally.xyz) — the onchain governance platform used by Uniswap, Arbitrum, ENS and 500+ other DAOs — is winding down end of March. Curious what people are planning to use inste…

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    Comment #47297623

    Appreciate the thoughtful response — and yeah, the integration angle is interesting. PayWatcher as a verification layer for chains QBitFlow doesn't natively cover yet makes a lot o…

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    Comment #47251816

    Cool to see another founder tackling this — respect the hustle. I think we're solving different slices of the same problem. QBitFlow wraps authorization + verification in smart con…

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    Comment #47235063

    Agreed on self-custodied being the way to go. I went down the Alchemy webhook path initially and it works — until it doesn't. The edge cases pile up: reorgs on Base (rare but real)…

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    Ask HN: How do you verify crypto payments in your app?

    I'm building a SaaS that accepts USDC payments. Simple requirement: customer sends stablecoins, I need to know when they arrived and the amount matches. Current options seem to be:…

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    Comment #47197778

    The nonce serialization problem is real — cache locks work but get hairy at scale, especially if you need concurrent payouts. For the verification side (confirming stakes arrived),…

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    Comment #47197192

    Yes, USDC on Base for now. The architecture is token-agnostic though — adding USDT or DAI is mostly config, not a rewrite. Base was the starting point because of low fees and Circl…

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    Show HN: How to Verify USDC Payments on Base Without a Payment Processor

    The Problem Nobody Talks About You want to accept a $10,000 USDC payment. You have two options: Option A: Integrate a payment processor like Coinbase Commerce. Set up an account, e…

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    Show HN: Built a children's hospice donation site using AI agents as team in 8h

    I was sick in bed and couldn't code. So I guided my son (no prior experience) through building a production-ready donation site using the BMAD method. BMAD (Multi-Agent Development…