The Treasury FiscalData API: Pull the U.S. National Debt as JSON (No Key)
The U.S. Treasury FiscalData API serves the national debt, interest rates, and FX rates as clean JSON — no API key. How to use it, with tested Python.
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Check If a Password Was Breached Without Sending It (HIBP k-Anonymity)
How Have I Been Pwned's k-anonymity range API lets you check a password against 900M+ breaches without ever sending it. Real code, real numbers, and the padding trick…
How One Regex Took Down Cloudflare: Catastrophic Backtracking, Tested in Your Browser
A 30-char string can hang a simple regex for 13 seconds. How ReDoS works, why it took down Cloudflare, and how to catch it in RegexLab.
The SEC EDGAR XBRL API: Pull Any Company’s Financials as JSON (No Key)
How to pull any US public company's financials as free JSON from the SEC EDGAR XBRL API, plus the revenue-tag gotcha that breaks naive screeners.
I Stopped Pasting JWTs Into Online Base64 Decoders — Here’s the Browser-Only Fix
Online base64 decoders run server-side, so pasting a live JWT leaks the token. Base64Lab decodes JWTs and files in your browser. Here's how it works.
The SpaceX 424B Prospectus Is Free on SEC EDGAR — Here’s What It Says and How to Pull It
SpaceX's 424B4 final prospectus (filed June 12, 2026) priced the IPO at $135/share. The real terms off the cover page, plus Python to pull it from SEC EDGAR.