vol. 01 · section B // category · fintech · tuesday, may 5, 2026

filed under Fintech

4 posts · newest first

1. №06 MAY 21

   Multi-broker auth: TOTP, OAuth, and token persistence done right

   How StalkMarket abstracts four Indian broker APIs (Angel One, Upstox, Zerodha, Groww) behind one provider interface — with TOTP, OAuth token injection, persisted tokens, proactive refresh, and a 401 retry path.

   #trading · #brokers · #auth · #oauth · #totp · #nodejs

2. №05 MAY 15

   Teaching StalkMarket to buy

   StalkMarket already knows when to sell. Now I'm wiring up the harder half — entries. Here's the messy filter that turned 25 candidate buy signals into the five I'd actually trust on HDFC Bank.

   #trading · #strategy · #nse · #stalkmarket · #design

3. №04 MAY 09

   Designing a pluggable trailing stop-loss engine

   How StalkMarket's strategy engine works: a pure-function Strategy interface, a discriminated StrategyResult, paise-precision math, and crash-safe deduplication for the trailing stop-loss.

   #trading · #strategy · #typescript · #algorithms · #sqlite · #testing

4. №03 MAY 02

   Building StalkMarket: a trailing stop-loss bot for the NSE on a Raspberry Pi

   How I designed and shipped StalkMarket — a multi-broker, multi-channel trailing stop-loss notification bot for the Indian stock market, running 24/7 on a Raspberry Pi 5 in Docker.

   #trading · #nse · #nodejs · #typescript · #fastify · #sqlite