# ACJ Labs > ACJ Labs builds products and infrastructure for agentic commerce — focused, inspectable tools for catalog data, tax-aware receipts, and more. Free tier, no card. This file helps language models discover the most useful content on this site. ## Home - [Where AI agents meet commerce.](https://acjlabs.com/index.md): ACJ Labs builds products and infrastructure for agentic commerce — focused, inspectable tools for catalog data, tax-aware receipts, and more. Free tier, no card. ## About - [About ACJ Labs](https://acjlabs.com/about.md): ACJ Labs — a portfolio lab building small, focused software tools for agentic commerce. ## Authors - [Authors](https://acjlabs.com/authors.md): ACJ Labs builds products and infrastructure for agentic commerce — focused, inspectable tools for catalog data, tax-aware receipts, and more. Free tier, no card. - [ACJ Labs](https://acjlabs.com/authors/acj-labs.md): ACJ Labs — where AI agents meet commerce. Company posts, no personal bylines. ## Blog - [Blog Posts](https://acjlabs.com/blog.md): this is meta description - [A wrong ABN and a smudged one look the same to OCR. We made sure ours doesn't guess.](https://acjlabs.com/blog/abn-checksum-verbatim.md): Most extraction tools quietly 'fix' a business number that doesn't check out. We added a fixture specifically to catch that — and confirmed the extractor transcribes what's printed, checksum-invalid or not. - [Build vs. buy: should your bookkeeping tool parse receipts with a raw LLM call?](https://acjlabs.com/blog/build-vs-buy-receipt-extraction.md): A vision-model call gets you 80% of receipt extraction in an afternoon. Here's an honest look at the other 20% — AU GST rules, ABN checksums, schema stability — and when it's worth paying for versus building yourself. - [Choosing a product categorization API: five questions that separate grounded from guessing](https://acjlabs.com/blog/choosing-product-categorization-api.md): A practical checklist for evaluating any product-categorization or Google-taxonomy API — grounding, valid IDs, calibrated confidence, honest nulls, taxonomy freshness — with the tradeoffs, and when a raw model call is genuinely enough. - [Choosing a receipt extraction API: six questions that separate tax-aware from just-OCR](https://acjlabs.com/blog/choosing-receipt-extraction-api.md): A practical checklist for evaluating any receipt or invoice extraction API — per-line AU GST treatment, ABN checksums, verbatim fidelity, schema stability, honest nulls — with the tradeoffs, and when a raw LLM call is genuinely enough. - [The GST rule your receipt scanner doesn't know exists](https://acjlabs.com/blog/gst-entertainment-rule.md): Entertainment expenses have their input tax credit denied by default under Australian GST rules — and nothing printed on the receipt tells you that. - [How to integrate the catalog attribute normalizer MCP server](https://acjlabs.com/blog/integrating-catalog-normalizer-mcp-server.md): A technical guide to integrating the ACJ Labs catalog attribute normalizer MCP server: installation, authentication, input/output schemas, rate limits, and client library usage. - [How to integrate the ACJ Labs receipt extraction MCP server](https://acjlabs.com/blog/integrating-receipt-extraction-mcp-server.md): A technical guide to integrating the ACJ Labs receipt extraction MCP server, covering installation, authentication, input/output schemas, rate limits, and client library usage. - [Mediterranean Diet Score: the validated 2-minute check-in, now open for testing](https://acjlabs.com/blog/introducing-mediterranean-diet-score.md): We built a free web app around MEDAS-14 — the published screening criteria from the PREDIMED trial. Fourteen questions, a 0–14 score, your trend saved on your device. No account, no logging, no card. - [Safe Sun Window: your sun timing, computed from published science — open for testing](https://acjlabs.com/blog/introducing-safe-sun-window.md): A free web app that takes your skin type and today's UV index and computes a personal safe-exposure and vitamin-D window from published models. No account, remembers you on your own device. - [x402 Bazaar Listing Monitor: catch a vanished listing before your revenue does](https://acjlabs.com/blog/introducing-x402-bazaar-listing-monitor.md): Coinbase CDP's Bazaar discovery catalog has a recurring bug where a resource silently stops appearing despite confirmed settlements. Here's how to check for it by hand, and the free tool that runs that check on a schedule. - [How accurate is "just ask the model to categorize it"? We measured — 1–2 of 12 checks.](https://acjlabs.com/blog/llm-taxonomy-accuracy-measured.md): A zero-shot prompt scored 1–2 exact matches out of 12 checks (6 products × Google + Shopify). Retrieval-grounding the same model scored 22 of 24 checks on a later, expanded 12-product set. Two runs, two set sizes, both stated — measured against a live API. - [Blog Posts](https://acjlabs.com/blog/page/2.md): this is meta description - [Blog Posts](https://acjlabs.com/blog/page/3.md): this is meta description - [AI product classifiers hand you category IDs that don't exist. Here's how we stopped ours.](https://acjlabs.com/blog/parka-category-id.md): A capable vision model labelled a winter parka as 'Shirts & Tops' — confidently. The fix wasn't a better prompt: ground every classification in the real taxonomy data. - [How long can you actually stay in the sun? It depends on your skin type and today's UV](https://acjlabs.com/blog/safe-sun-exposure-time-by-skin-type.md): Safe sun exposure time isn't one number — it's a function of your Fitzpatrick skin type and the UV index. Here's the published science, with real worked examples. - [What is a good Mediterranean diet score? The 14 checks behind the 0–14 number](https://acjlabs.com/blog/what-is-a-good-mediterranean-diet-score.md): MEDAS scores a diet out of 14 by checking 14 thresholds, each worth one point. Here is every criterion, where the high/moderate/lower boundaries come from, and what the total leaves out. ## Categories - [Categories](https://acjlabs.com/categories.md): ACJ Labs builds products and infrastructure for agentic commerce — focused, inspectable tools for catalog data, tax-aware receipts, and more. Free tier, no card. - [Engineering](https://acjlabs.com/categories/engineering.md): ACJ Labs builds products and infrastructure for agentic commerce — focused, inspectable tools for catalog data, tax-aware receipts, and more. Free tier, no card. - [Products](https://acjlabs.com/categories/products.md): ACJ Labs builds products and infrastructure for agentic commerce — focused, inspectable tools for catalog data, tax-aware receipts, and more. Free tier, no card. - [Tax](https://acjlabs.com/categories/tax.md): ACJ Labs builds products and infrastructure for agentic commerce — focused, inspectable tools for catalog data, tax-aware receipts, and more. Free tier, no card. ## Contact - [Contact](https://acjlabs.com/contact.md): Contact ACJ Labs — email us at contact@acjlabs.com. ## Faq - [FAQ](https://acjlabs.com/faq.md): Straight answers on pricing, accuracy, AU GST/ABN scope, taxonomy coverage, x402 Bazaar listing monitoring, keys, and data handling for the ACJ Labs APIs. ## News - [News](https://acjlabs.com/news.md): Product launches, channel availability, and release notes from ACJ Labs. ## Open-source - [Open Source](https://acjlabs.com/open-source.md): Zero-dependency, MIT-licensed utilities we extracted from our own products. Free on npm. ## Privacy-policy - [Privacy](https://acjlabs.com/privacy-policy.md): What this website and our services collect, and what we do with it. ## Products - [Products](https://acjlabs.com/products.md): MCP servers and APIs for agentic commerce — catalog attribute normalization, AU GST-aware receipt extraction, x402 Bazaar listing monitoring — plus two free consumer web apps: Safe Sun Window and the Mediterranean Diet Score. ## Tags - [Tags](https://acjlabs.com/tags.md): ACJ Labs builds products and infrastructure for agentic commerce — focused, inspectable tools for catalog data, tax-aware receipts, and more. Free tier, no card. - [Abn](https://acjlabs.com/tags/abn.md): ACJ Labs builds products and infrastructure for agentic commerce — focused, inspectable tools for catalog data, tax-aware receipts, and more. Free tier, no card. - [Api](https://acjlabs.com/tags/api.md): ACJ Labs builds products and infrastructure for agentic commerce — focused, inspectable tools for catalog data, tax-aware receipts, and more. Free tier, no card. - [Api integration](https://acjlabs.com/tags/api-integration.md): ACJ Labs builds products and infrastructure for agentic commerce — focused, inspectable tools for catalog data, tax-aware receipts, and more. Free tier, no card. - [Australia](https://acjlabs.com/tags/australia.md): ACJ Labs builds products and infrastructure for agentic commerce — focused, inspectable tools for catalog data, tax-aware receipts, and more. Free tier, no card. - [Build vs buy](https://acjlabs.com/tags/build-vs-buy.md): ACJ Labs builds products and infrastructure for agentic commerce — focused, inspectable tools for catalog data, tax-aware receipts, and more. Free tier, no card. - [Catalog](https://acjlabs.com/tags/catalog.md): ACJ Labs builds products and infrastructure for agentic commerce — focused, inspectable tools for catalog data, tax-aware receipts, and more. Free tier, no card. - [Catalog normalizer](https://acjlabs.com/tags/catalog-normalizer.md): ACJ Labs builds products and infrastructure for agentic commerce — focused, inspectable tools for catalog data, tax-aware receipts, and more. Free tier, no card. - [Classification](https://acjlabs.com/tags/classification.md): ACJ Labs builds products and infrastructure for agentic commerce — focused, inspectable tools for catalog data, tax-aware receipts, and more. Free tier, no card. - [Consumer](https://acjlabs.com/tags/consumer.md): ACJ Labs builds products and infrastructure for agentic commerce — focused, inspectable tools for catalog data, tax-aware receipts, and more. Free tier, no card. - [Engineering](https://acjlabs.com/tags/engineering.md): ACJ Labs builds products and infrastructure for agentic commerce — focused, inspectable tools for catalog data, tax-aware receipts, and more. Free tier, no card. - [Evaluation](https://acjlabs.com/tags/evaluation.md): ACJ Labs builds products and infrastructure for agentic commerce — focused, inspectable tools for catalog data, tax-aware receipts, and more. Free tier, no card. - [Google product category](https://acjlabs.com/tags/google-product-category.md): ACJ Labs builds products and infrastructure for agentic commerce — focused, inspectable tools for catalog data, tax-aware receipts, and more. Free tier, no card. - [Gst](https://acjlabs.com/tags/gst.md): ACJ Labs builds products and infrastructure for agentic commerce — focused, inspectable tools for catalog data, tax-aware receipts, and more. Free tier, no card. - [Invoicing](https://acjlabs.com/tags/invoicing.md): ACJ Labs builds products and infrastructure for agentic commerce — focused, inspectable tools for catalog data, tax-aware receipts, and more. Free tier, no card. - [Json rpc](https://acjlabs.com/tags/json-rpc.md): ACJ Labs builds products and infrastructure for agentic commerce — focused, inspectable tools for catalog data, tax-aware receipts, and more. Free tier, no card. - [Launch](https://acjlabs.com/tags/launch.md): ACJ Labs builds products and infrastructure for agentic commerce — focused, inspectable tools for catalog data, tax-aware receipts, and more. Free tier, no card. - [Llm](https://acjlabs.com/tags/llm.md): ACJ Labs builds products and infrastructure for agentic commerce — focused, inspectable tools for catalog data, tax-aware receipts, and more. Free tier, no card. - [Mcp](https://acjlabs.com/tags/mcp.md): ACJ Labs builds products and infrastructure for agentic commerce — focused, inspectable tools for catalog data, tax-aware receipts, and more. Free tier, no card. - [Mediterranean diet](https://acjlabs.com/tags/mediterranean-diet.md): ACJ Labs builds products and infrastructure for agentic commerce — focused, inspectable tools for catalog data, tax-aware receipts, and more. Free tier, no card. - [Monitoring](https://acjlabs.com/tags/monitoring.md): ACJ Labs builds products and infrastructure for agentic commerce — focused, inspectable tools for catalog data, tax-aware receipts, and more. Free tier, no card. - [Nutrition](https://acjlabs.com/tags/nutrition.md): ACJ Labs builds products and infrastructure for agentic commerce — focused, inspectable tools for catalog data, tax-aware receipts, and more. Free tier, no card. - [Product taxonomy](https://acjlabs.com/tags/product-taxonomy.md): ACJ Labs builds products and infrastructure for agentic commerce — focused, inspectable tools for catalog data, tax-aware receipts, and more. Free tier, no card. - [Receipt extraction](https://acjlabs.com/tags/receipt-extraction.md): ACJ Labs builds products and infrastructure for agentic commerce — focused, inspectable tools for catalog data, tax-aware receipts, and more. Free tier, no card. - [Receipts](https://acjlabs.com/tags/receipts.md): ACJ Labs builds products and infrastructure for agentic commerce — focused, inspectable tools for catalog data, tax-aware receipts, and more. Free tier, no card. - [Sun safety](https://acjlabs.com/tags/sun-safety.md): ACJ Labs builds products and infrastructure for agentic commerce — focused, inspectable tools for catalog data, tax-aware receipts, and more. Free tier, no card. - [Taxonomy](https://acjlabs.com/tags/taxonomy.md): ACJ Labs builds products and infrastructure for agentic commerce — focused, inspectable tools for catalog data, tax-aware receipts, and more. Free tier, no card. - [Uv](https://acjlabs.com/tags/uv.md): ACJ Labs builds products and infrastructure for agentic commerce — focused, inspectable tools for catalog data, tax-aware receipts, and more. Free tier, no card. - [X402](https://acjlabs.com/tags/x402.md): ACJ Labs builds products and infrastructure for agentic commerce — focused, inspectable tools for catalog data, tax-aware receipts, and more. Free tier, no card.