ACJ Labs

ACJ Labs builds focused MCP servers, APIs, and open-source utilities for agentic commerce. Posts are written and published by the lab under its own name.

A wrong ABN and a smudged one look the same to OCR. We made sure ours doesn't guess.

Every Australian Business Number carries a checksum — a modulus-89 formula baked into the digits themselves, so a wrong ABN is usually mathematically detectable, not just "looks a bit off." Which…

Build vs. buy: should your bookkeeping tool parse receipts with a raw LLM call?

Here's the honest version of the pitch first: if all you need is vendor, date, and total off a receipt, you should probably build it yourself. A single vision-model call — GPT-4o-mini, Gemini Flash…

Choosing a product categorization API: five questions that separate grounded from guessing

ACJ Labs
Engineering
26 Jul, 2026

If you're mapping a product feed to the Google Product Taxonomy, you have more options than you did a year ago — a raw LLM call, a handful of categorization APIs, a feed tool with categorization…

Choosing a receipt extraction API: six questions that separate tax-aware from just-OCR

The GST rule your receipt scanner doesn't know exists

A restaurant receipt and a client dinner look identical to an OCR tool. Under Australian GST rules, they aren't: entertainment expenses have their input tax credit (ITC) denied by default — GST was…

How to integrate the catalog attribute normalizer MCP server

ACJ Labs
Engineering
27 Jul, 2026

This guide covers the mechanical integration steps for the catalog-attribute-normalizer MCP server: client configuration, authentication, and tool usage, so you can normalize product catalogs against…

How to integrate the ACJ Labs receipt extraction MCP server

ACJ Labs
Engineering
27 Jul, 2026

This guide covers the mechanical integration steps for the ACJ Labs receipt extraction MCP server: client configuration, authentication, schema definitions, and error handling, so you can consume the…

Mediterranean Diet Score: the validated 2-minute check-in, now open for testing

ACJ Labs
Products
27 Jul, 2026

Millions of people try to "eat Mediterranean," and the tools on offer are mostly calorie loggers and recipe books. Meanwhile nutrition science has had a purpose-built measuring instrument for years…

Safe Sun Window: your sun timing, computed from published science — open for testing

ACJ Labs
Products
27 Jul, 2026

Public-health apps tell you when to cover up. Almost nothing tells you the other half: how much sun your skin type can take today before burn risk, and what that means for the daily vitamin-D moment.…

x402 Bazaar Listing Monitor: catch a vanished listing before your revenue does

ACJ Labs
Engineering
02 Aug, 2026

If you sell over x402, your buyers find you through Coinbase CDP's Bazaar discovery catalog. It's the directory that lets an agent or a buyer's client discover your payTo address and the resources…

How accurate is "just ask the model to categorize it"? We measured — 1–2 of 12 checks.

ACJ Labs
Engineering
25 Jul, 2026

If you're mapping a product catalog into Google's Product Taxonomy, the obvious first move is to hand the title and description to a capable model and ask for the category. It reads well in a demo.…

AI product classifiers hand you category IDs that don't exist. Here's how we stopped ours.

ACJ Labs
Engineering
23 Jul, 2026

Ask a capable AI model to classify a product into Google's Product Taxonomy and it will do something unsettling: return an ID that looks completely valid — right format, plausible category name — and…

How long can you actually stay in the sun? It depends on your skin type and today's UV

ACJ Labs
Products
27 Jul, 2026

"Wear sunscreen when the UV index is high" is the advice everyone gives. It's also not a real answer to the question most people actually have: how long can I be outside right now before I need to…

What is a good Mediterranean diet score? The 14 checks behind the 0–14 number

ACJ Labs
Products
29 Jul, 2026

If you have taken a Mediterranean diet questionnaire and come out with a number, the obvious next question is what that number is supposed to mean. The short version: in the published literature, a…