Google Maps Platform + Grounding Lite MCP vs Mapbox APIs + MCP

Google Maps Platform + Grounding Lite MCP

Maps Grounding Lite is GA, hosted, and takes an X-Goog-Api-Key header or OAuth with the maps-platform.mapstools scope. A Cloud billing account with a payment method is required before the free caps apply.

Mapbox APIs + MCP

Official MCP server, hosted at mcp.mapbox.com with OAuth or run locally, listed in the MCP registry. Storing geocodes needs the Permanent tier at $5 per 1,000, about 6.7 times the temporary rate.

Google Maps Platform + Grounding Lite MCP

1. Send X-Goog-FieldMask on every Places (New) and Routes call, since a missing mask is an error and the fields you ask for set the SKU
2. Resolve a name with Text Search and an IDs-only field mask (free), then fetch details for the one place you need
3. Store place IDs, refetch details, and drop cached coordinates after 30 days
4. Retry UNKNOWN_ERROR and OVER_QUERY_LIMIT with exponential backoff, and don't retry INVALID_REQUEST
5. Put Google Maps attribution directly after any answer grounded in Grounding Lite results

Mapbox APIs + MCP

1. Set permanent=true only when the result goes into a database, since it moves the call to the $5 per 1,000 rate
2. Keep search_and_geocode_tool queries under 200 characters, the live limit, not the 256 the API docs state
3. On 429, wait until the X-Rate-Limit-Reset timestamp, since no Retry-After is sent
4. Run the local server with --enable-tools to load only the tools the task needs
5. Use category_search_tool for generic place types like coffee shops, not search_and_geocode_tool