Field Notes

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Engineering insights on Xperience by Kentico, AI-driven development, and agent commerce
4 of 34 articles

Field notes from production work: Xperience by Kentico architecture, AI-assisted engineering with Claude Code, and commerce built for AI agents.

The Paywall Was the Boring Part: What L402 Is Actually For bItcoin
Jun 17, 2026 - Mike Rahel

The Paywall Was the Boring Part: What L402 Is Actually For

For two years L402 has been pitched as a paywall for APIs — but the payment is the least interesting thing it does. It is really a delegation-and-proo...

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The Agent Economy Needs a Payment Standard. Here's Why Bitcoin Wins. lightning network
Feb 22, 2026 - Mike Rahel

The Agent Economy Needs a Payment Standard. Here's Why Bitcoin Wins.

A business guide to choosing between L402 (Bitcoin/Lightning) and X402 (Ethereum/Coinbase) for machine-to-machine payments, comparing cost structure, ...

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The Internet Has an AI Spam Problem. Bitcoin Proof-of-Work Is the Original Solution. authentication
Feb 15, 2026 - Mike Rahel

The Internet Has an AI Spam Problem. Bitcoin Proof-of-Work Is the Original Solution.

How L402 paywalls turn the economics of spam against the spammers — and why this was always the point of proof-of-work.

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When Bitcoin Meets Enterprise Security: WS-Federation Through a crypto(graphy) Lens authentication
Dec 18, 2025 - Mike Rahel

When Bitcoin Meets Enterprise Security: WS-Federation Through a crypto(graphy) Lens

You know that moment when you're troubleshooting authentication errors at 2 AM and suddenly realize you've been thinking about certificates all wrong?...

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