Blog
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Two Critical Bugs in a Public AI Widget
How two independent audit sessions found an XSS vulnerability and a billing bypass in a public-facing AI helpdesk widget -- and why the builder missed both.
We Built Intercom Before We Built a Chat Widget
How we spent months building a 17-module AI platform with 50+ agents and 3,300-line landing pages -- then built a better helpdesk widget in one afternoon.
From Docs Chatbot to Live Support Agent
How we turned sh0's existing AI docs assistant into a public helpdesk widget with 9 files, zero new infrastructure, and the same SSE streaming pipeline.
Why I Built My Own AI Helpdesk Instead of Paying for One
Why I built an AI-powered live chat widget for sh0.dev instead of paying $50/month for Intercom -- and how it costs $0.002 per conversation.
Architecture Decisions: Python, FastAPI, SolidJS, SQLite
The architecture behind 0fee.dev: why we chose Python FastAPI, SolidJS, SQLite, DragonflyDB, and Celery. By Juste A. Gnimavo and Claude.
The Auditor Caught What the Builder Missed
How independent AI audit sessions found 5 Critical, 12 Important, and 19 Minor issues in 3,200 lines of Rust CLI code -- and why the builder never would have caught them.
Christmas Day Debugging: i18n, SDKs, and Currency Bugs
Sessions 064-067 on Christmas Day 2025: building i18n, rewriting SDKs, and fixing currency bugs from Abidjan. By Juste A. Gnimavo.
BUI and PaiementPro: Local Champions for West Africa
How 0fee.dev integrates BUI and PaiementPro for West African mobile money with OTP validation, Wave redirect, and SDK integration.
The Simplified 3-Field API: Amount, Currency, Reference
How 0fee.dev reduced its payment API to 3 required fields: amount, currency, and reference. Hosted checkout as the default. By Juste A. Gnimavo and Claude.
The Middleman Callback Pattern: Verifying Every Payment
How 0fee.dev's middleman callback pattern verifies every payment by intercepting provider redirects before reaching the developer.
SDK v3: PHP, Go, Rust, Java, Flutter, and React Native
How we expanded the 0fee.dev SDK portfolio from 2 to 8 languages, jumping from 21% to 79% API coverage in two sessions. By Juste A. Gnimavo and Claude.
The CLI Tool: zerofee-cli
How we built zerofee-cli with Python, Typer, Rich, and httpx -- login, payments, webhook forwarding, log streaming. By Juste A. Gnimavo and Claude.