# Zonio Developers

Poland’s land, zoning and infrastructure data as an API and an MCP server. Search 38M parcels in plain language from your code or your AI agent.

- [Introduction](/introduction): What the Zonio developer platform is, who it is for, and the ways to use it.
- [Quickstart](/quickstart): Get an API key, make your first request and connect your first agent in five minutes.
- [Authentication](/authentication): API keys, scopes, OAuth for MCP clients, and keeping keys safe.
- [Core concepts](/concepts): Parcel ids, TERYT codes, Polish planning instruments, coordinates and coverage: the vocabulary of the API.
- [Zonio MCP server](/mcp/): The Zonio MCP server lets Claude and other AI agents search, inspect and compare Polish land parcels in plain language.
- [Connect your agent](/mcp/connect): Add the Zonio MCP server to Claude.ai, Claude Desktop, Claude Code, Cursor, VS Code or any MCP client.
- [Tools](/mcp/tools): Reference for every tool exposed by the Zonio MCP server: inputs, outputs and when an agent should use each.
- [Resources & prompts](/mcp/resources-and-prompts): MCP resources and prompt templates exposed by the Zonio server.
- [Plain-language parcel search](/mcp/natural-language-search): How Zonio turns a plain-language request into a precise, explainable parcel search.
- [Prompt cookbook](/mcp/cookbook): Proven prompts for site selection, due diligence, market research and monitoring with the Zonio MCP server.
- [Build an agent with the Claude API](/mcp/claude-api): Put the Zonio MCP server inside your own product using the Claude API's MCP connector.
- [REST API overview](/api/): Base URL, conventions, formats and versioning of the Zonio Geo API.
- [Errors](/api/errors): Error format, error codes and retry guidance for the Zonio Geo API.
- [Zonio Geo API](/reference): The Zonio Geo API exposes the national land dataset that powers Zonio: every cadastral parcel in Poland, the local and general plans that zone it, the environmental and regulatory constraints that limit it, and the infrastructure around it. All requests require an API key sent as `Authorization: Bearer <key>`. Geometry is returned as GeoJSON in WGS84 (EPSG:4326); every distance and area is computed in metres in EPSG:2180 (PUWG 1992).
- [SDKs](/api/sdks): Official TypeScript and Python SDKs for the Zonio Geo API.
- [Find a parcel](/guides/find-a-parcel): Five ways to get from what your user knows (an address, a click on a map, a parcel number) to a Zonio parcel.
- [Site selection with scenarios](/guides/site-selection): Screen a region for the best sites for solar, BESS, housing or logistics with scenarios and transparent ranking.
- [Parcel due diligence](/guides/due-diligence): Assemble zoning, constraints, terrain, infrastructure and market data for one parcel, or get it as a PDF.
- [Maps & vector tiles](/guides/maps): Render Zonio layers in MapLibre with PMTiles vector tiles, and link API results to a map.
- [Data catalogue](/data/): How the data behind the Zonio API is organised, and where to explore it.
- [Layers](/data/layers): Every data layer in the Zonio catalogue, grouped by category, with its source and how it is served.
- [Scenarios](/data/scenarios): The catalogue of site-selection scenarios: hard criteria, defaults and ranking signals for each asset type.
- [Coverage & freshness](/data/coverage): Which layers are national, which are partial, how often they refresh, and how the API reports gaps.
- [Provenance & pipeline](/data/pipeline): How the Zonio ETL fetches, validates, stores and traces every row back to its source.
- [Use cases](/use-cases): What teams build on Zonio, from AI land scouts to map products.
- [Request access](/access): How to request an API key for the Zonio developer platform.
- [Glossary](/glossary): Polish planning, cadastral and energy terms used across the Zonio API.
- [Zonio Developers](/index): Poland's land, zoning and infrastructure data as an API and an MCP server.
- [Geocoding](/reference/geocoding): Turn addresses and place names into parcels and TERYT codes.
- [Layers](/reference/layers): The raw data layers behind every answer.
- [Market](/reference/market): Real-estate transaction comparables and price medians.
- [Parcels](/reference/parcels): Look up a parcel and everything known about it.
- [Search](/reference/search): Find parcels with structured filters or a plain-language query.