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@Thepracticaldev

A constructive and inclusive social network for software developers. With you every step of your journey.

  • 10,542articles · 30d
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  • Aug 14, 2026earliest in window
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DEV Community
dev.to > polycratia > parse-crypto-amounts-like-hostile-input-declare-rounding-first-2df3

Parse crypto amounts like hostile input, declare rounding first

16+ hour, 48+ min ago   (712+ words) I have been building payment and crypto systems in production since 2018: custodial wallets for BTC and ETH, a fiat-to-crypto onramp, exchange order books, stablecoin rails in daily use. The amounts that gave me the most trouble were not the large…...

DEV Community
dev.to > superwavvy > 5-errors-i-hit-building-defi-bots-and-how-to-fix-them-106f

5 Errors I Hit Building DeFi Bots (And How to Fix Them)

22+ hour, 14+ min ago   (580+ words) Building production bots on free APIs sounds cool in theory. In practice, you hit walls immediately. Here are the 5 real errors I encountered while building two Ethereum monitoring bots, and exactly how I fixed them. The Problem: I started monitoring…...

DEV Community
dev.to > fengyugbt > endogenous-hazard-the-model-starts-listening-to-the-market-4bko

Endogenous Hazard: The Model Starts Listening to the Market

1+ day, 4+ hour ago   (414+ words) Three articles ago I wrote that "endogeneity" was the deepest of the three critiques a derivatives-savvy reader made of my crash simulator. Two articles ago I built the margin spiral. Last article I built the dealer short-gamma spiral and ended…...

DEV Community
dev.to > eminsk > why-90-of-candlestick-patterns-fail-building-an-institutional-ai-confluence-scanner-in-python-3ep

Why 90% of Candlestick Patterns Fail: Building an Institutional AI Confluence Scanner in Python

1+ day, 8+ hour ago   (23+ words) If you have ever attempted to build an algorithmic trading bot in Python, you have almost certainly... Tagged with python, trading, ai, opensource....

DEV Community
dev.to > abrownfox001 > 150ms-taker-delay-and-volume-tier-limits-a7k

150ms Taker Delay and Volume-Tier Limits

2+ day, 20+ hour ago   (351+ words) Part 2 pinned the settlement target: 60s Chainlink TWAP. Part 3 is the matching layer. A correct P(up) still dies if the venue changed how taker orders are allowed to race. Add the older delay-lock behavior: once a taker order enters the…...

DEV Community
dev.to > hannune > building-an-investing-knowledge-graph-part-6-if-youre-merging-data-from-more-than-one-source-2ecn

Building an investing knowledge graph, part 6: if you're merging data from more than one source, you'll hit this

3+ day, 3+ hour ago   (444+ words) Since part 5 went up, I've had two conversations worth writing about. One was with someone building a financial news aggregation system who wanted to know if the ER setup here would work for their case. The other was with someone…...

DEV Community
dev.to > edycutjong > hederas-evm-speaks-tinybar-its-rpc-speaks-weibar-and-both-mistakes-return-success-132e

Hedera's EVM speaks tinybar, its RPC speaks weibar, and both mistakes return SUCCESS

3+ day, 5+ hour ago   (709+ words) I lost most of a day to a bug that never once failed. I was building a contract that pays for its own future: an access subscription that re-arms itself on-chain through the Hedera Schedule Service, so an agent pays…...

DEV Community
dev.to > soulcrancerdev > building-a-polymarket-twap-state-machine-for-trading-bots-34ae

Building a Polymarket TWAP State Machine for Trading Bots

3+ day, 12+ hour ago   (709+ words) Learn why a Polymarket TWAP state machine should model resolution, oracle observations, market time, and execution as separate states. A short-duration trading bot can receive every price update correctly and still make a structurally wrong decision. The reason is simple:…...

DEV Community
dev.to > serdartavukcu > borsa-verisiyle-calisirken-surekli-donup-dolasip-kullandigim-6-python-kutuphanesi-2apj

Borsa Verisiyle Çalışırken Sürekli Dönüp Dolaşıp Kullandığım 6 Python Kütüphanesi

3+ day, 18+ hour ago   (59+ words) Arac secimi zeka degil tekrar meselesi, ayni ise ayni araci kullanmak hiz kazandiriyor. Tagged with finance, python, data....

DEV Community
dev.to > sumaninster > the-option-pricing-model-backsolve-and-pwerm-part-2-55mi

The Option Pricing Model, Backsolve and PWERM (Part 2)

3+ day, 23+ hour ago   (1166+ words) Part one of this series ended on a claim: for a venture-backed company that recently raised, the enterprise value is not really the hard part. Someone paid a price in an arm's-length transaction and that price is your anchor. The…...