# llms.txt · sizeguide.ai

## Canonical resources
- /methodology/     # engine rules, confidence formula, provenance standard
- /developers/      # REST API v0.1 reference
- /size-charts/     # provenance-labeled, dated size charts
- /pricing/         # flat tiers; no order-volume surcharges
- /contact/         # merchant pilots, API keys, chart corrections
- /developers/schema/  # Open Sizing Schema v0.1 index

## API (stateless, structured JSON)
- GET  https://api.sizeguide.ai/health
- POST https://api.sizeguide.ai/v1/recommend   # size + confidence + provenance
- POST https://api.sizeguide.ai/v1/convert     # table-driven size conversion
- GET  https://api.sizeguide.ai/v1/charts/:slug
- MCP  https://mcp.sizeguide.ai                # recommend_size, convert_size, get_size_chart, explain_fit

## Schema (JSON Schema draft 2020-12, generated from the engine contract)
- https://sizeguide.ai/schema/v0.1/chart.json
- https://sizeguide.ai/schema/v0.1/recommend-request.json
- https://sizeguide.ai/schema/v0.1/recommend-response.json
- https://sizeguide.ai/schema/v0.1/convert-request.json
- https://sizeguide.ai/schema/v0.1/convert-response.json
- https://sizeguide.ai/schema/v0.1/error.json

## Data policy
- Every chart carries provenance and a last-verified date
- Recommendations are deterministic and explainable
- Below the confidence floor, the engine declines
- Everything listed here is shipped and answering
- Private charts need an API key (Authorization: Bearer, issued via /contact/);
  reference charts are public