PlateHarbor API

Machine-readable discovery

• OpenAPI 3.1 JSON
• API catalog
• MCP endpoint (POST-only JSON-RPC)
• API llms.txt
• API robots.txt
• API sitemap.xml
• llms.txt
• sitemap.xml

Coverage model

PlateHarbor publishes structured state renewal and county emissions data with source links, freshness metadata, and machine-readable schemas.

MCP access

PlateHarbor also exposes a read-only MCP endpoint for agent runtimes that support remote MCP over HTTP. The endpoint is POST-only JSON-RPC, so a browser GET will return 405 by design.

curl -X POST https://api.plateharbor.com/mcp \
  -H "Content-Type: application/json" \
  -H "Accept: application/json, text/event-stream" \
  -d '{"jsonrpc":"2.0","id":1,"method":"initialize","params":{"protocolVersion":"2025-06-18","capabilities":{},"clientInfo":{"name":"example","version":"0.1.0"}}}'

Public endpoints

• GET /healthz health and environment status
• GET /api/v1/states supported states
• GET /api/v1/pages crawlable state, county, and situation pages
• GET /api/v1/renewal/:state state renewal guidance
• GET /api/v1/situations/:state/:topic title, move, and credential-routing guides
• GET /api/v1/emissions/:state/:county county emissions guidance
• GET /api/v1/check next-step recommendation

Common reads

curl https://api.plateharbor.com/api/v1/renewal/colorado

curl https://api.plateharbor.com/api/v1/situations/colorado/new-resident

curl https://api.plateharbor.com/api/v1/emissions/arizona/maricopa

curl "https://api.plateharbor.com/api/v1/check?state=arizona&county=maricopa&vehicle_age=8&fuel_type=gas"

Trust pages

• Methodology
• Source policy
• Editorial policy