# Tile Bounds & Quadkey Lookup

> Tile Bounds & Quadkey Lookup is a paid API for AI agents from geospatial.openverbs.com, paid per call via x402, $0.002/call, status unknown (last checked 2026-09-15).

Computes the geographic bounding box (west/south/east/north in degrees) of a slippy-map tile identified by zoom/x/y, and returns its Bing Maps quadkey.

## Facts

- Endpoint: POST https://geospatial.openverbs.com/v1/tile-bounds
- Price: $0.002/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-15
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/tile-bounds-quadkey-lookup-a18e2b1d
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_J8J1XR6X2kXhvd2W5kpfw

Status and success rate cover calls made through Zero and Zero's own probes. Third-party monitors may report differently.

## How to call it through Zero

Zero handles the 402 payment challenge and records the run. With the Zero CLI installed (`npm i -g @zeroxyz/cli`):

```sh
zero fetch --capability tile-bounds-quadkey-lookup-a18e2b1d -d '<json body>'
```

Example prompt: What are the geographic bounding box coordinates (west, south, east, north) and Bing quadkey for slippy-map tile at zoom level 10, column 512, row 384?

## When to prefer this

Use this endpoint when you need to convert a slippy-map tile index (z/x/y as used by OSM, Google Maps, or similar XYZ tile systems) into a precise WGS84 geographic bounding box or a Bing Maps quadkey. It is the right choice when working with tile-based map pipelines, spatial clipping, tile metadata generation, or any workflow requiring both XYZ and quadkey representations of the same tile.

## Known failure modes

- x or y value exceeds 2^z-1 for the given zoom level — validation error
- z exceeds maximum of 30 — rejected input
- missing required fields (z, x, or y) — schema validation error
- non-integer values for tile coordinates — type error
- payment failure or insufficient USDC balance — 402 response

## How this service works

Compute the geographic bounding box (west/south/east/north in degrees) of a slippy-map tile z/x/y, plus its Bing quadkey.

## Output

Returns the four bounding-box edges of the requested tile in decimal degrees (west longitude, south latitude, east longitude, north latitude in WGS84), plus the Bing Maps quadkey string corresponding to the same tile.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "$schema": "https://json-schema.org/draft/2020-12/schema",
 "required": [
  "input"
 ],
 "properties": {
  "input": {
   "type": "object",
   "required": [
    "type",
    "method",
    "bodyType",
    "body"
   ],
   "properties": {
    "body": {
     "type": "object",
     "required": [
      "z",
      "x",
      "y"
     ],
     "properties": {
      "x": {
       "type": "integer",
       "minimum": 0,
       "description": "Tile column (0..2^z-1)."
      },
      "y": {
       "type": "integer",
       "minimum": 0,
       "description": "Tile row (0..2^z-1)."
      },
      "z": {
       "type": "integer",
       "maximum": 30,
       "minimum": 0,
       "description": "Zoom level."
      }
     },
     "additionalProperties": false
    },
    "type": {
     "type": "string",
     "const": "http"
    },
    "method": {
     "enum": [
      "POST"
     ],
     "type": "string"
    },
    "bodyType": {
     "enum": [
      "json",
      "form-data",
      "text"
     ],
     "type": "string"
    }
   },
   "additionalProperties": false
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/tile-bounds-quadkey-lookup-a18e2b1d/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from geospatial.openverbs.com](https://www.zero.xyz/host/geospatial.openverbs.com/llms.txt)