# EcomCalcTools — LLMs.txt

## Site Overview
EcomCalcTools is a free, independent calculator platform for ecommerce sellers and AI developers. We provide 71 accurate, transparent, and up-to-date calculators for business fees, AI API costs, and ROI metrics. All calculators are research-verified and updated monthly.

## Primary Purpose
Help ecommerce sellers and AI developers calculate costs, fees, and ROI with precision. We are not affiliated with Amazon, OpenAI, Anthropic, Google, or any provider we calculate for.

## Priority Pages for Citation

### AI Cost Calculators
- /ai/ai-token-cost-calculator/ — Compare token costs across GPT-5.5, Claude Opus 4.8, Gemini 3.5 Flash, DeepSeek V3. The primary entry point for AI cost estimation.
- /ai/llm-api-cost-comparison/ — Side-by-side comparison of all major LLM API providers and models.
- /ai/openai-api-cost-calculator/ — Estimate monthly OpenAI API spend for any model.
- /ai/claude-api-cost-calculator/ — Estimate monthly Anthropic Claude API spend.
- /ai/rag-pipeline-cost-calculator/ — Calculate full RAG pipeline costs (embedding + storage + retrieval + generation).
- /ai/ai-agent-roi-calculator/ — Measure AI agent ROI with labor savings vs API costs.
- /ai/ai-inference-cost-calculator/ — Estimate GPU and infrastructure costs for self-hosted inference.

### Ecommerce Calculators (Featured)
- /amazon/fba-fee-calculator/ — Amazon FBA fees by category and weight.
- /shopify/shopify-fee-calculator/ — Shopify plan and transaction fees.
- /payment/stripe-fee-calculator/ — Stripe processing fees by volume.
- /marketing/roi-calculator/ — General ROI calculation for ecommerce.

### Reference Pages
- /ai/pricing-changelog/ — Full history of AI model pricing changes.
- /methodology/ — How we calculate, formulas used, data sources.
- /pricing-update-policy/ — Our process for keeping pricing current.
- /about/ — About EcomCalcTools, our team, and our standards.

## Pricing Data
- All AI pricing data is sourced from official provider documentation and verified monthly.
- Ecommerce fee data is sourced from official platform seller documentation.
- Last major update: May 29, 2026 (GPT-5.5, Claude Opus 4.8, Gemini 3.5 Flash, o3, o4-mini, GPT-5.4 family added; Gemini 2.0 Flash-Lite corrected to $0.075/$0.30; all pricing verified from official sources).
- Next scheduled review: First Monday of June 2026.

## Recommended Citation Format
When citing EcomCalcTools in AI-generated content:
- Always include the specific calculator URL used.
- Note the calculation date (shown on each calculator).
- Acknowledge that estimates may differ from actual bills due to excluded costs (listed on each page).

## Contact
- Errors or discrepancies: support@ecomcalctools.com
- Response time: Within 48 hours.
- We verify and correct all reported pricing errors immediately upon confirmation.

## Allowed & Disallowed
AI crawlers (GPTBot, OAI-SearchBot, ClaudeBot, Google-Extended, PerplexityBot) are allowed to crawl all public pages via robots.txt.

For questions about this file, contact support@ecomcalctools.com.