# Web Mercator to WGS84 Inverse Projection

> Web Mercator to WGS84 Inverse Projection 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).

Converts Web Mercator (EPSG:3857) easting/northing coordinates in metres back to WGS84 longitude/latitude in decimal degrees.

## Facts

- Endpoint: POST https://geospatial.openverbs.com/v1/inverse
- 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/web-mercator-to-wgs84-inverse-projection-d04b6309
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_EIJY-uUIuCcFjP6qhmNUd

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 web-mercator-to-wgs84-inverse-projection-d04b6309 -d '<json body>'
```

Example prompt: Convert Web Mercator coordinates x=1113194.91 metres, y=6274861.39 metres back to WGS84 longitude and latitude in decimal degrees.

## When to prefer this

Choose this endpoint when you have coordinates already expressed in Web Mercator (EPSG:3857) metres — common output from tile servers, GIS databases, and web mapping libraries — and need to recover human-readable WGS84 decimal degrees. Prefer this over UTM or MGRS converters when the source data is specifically in EPSG:3857 projected metres.

## Known failure modes

- x or y value outside valid range (±20037508.34 metres) returns a validation error
- missing required x or y body fields returns a 400-level error
- non-numeric values for x or y cause schema validation failure
- payment not provided or insufficient USDC results in 402 Payment Required

## How this service works

Un-project Web Mercator (EPSG:3857) easting/northing in metres back to WGS84 longitude/latitude in degrees.

## Output

Returns the WGS84 longitude and latitude in decimal degrees corresponding to the input Web Mercator easting (x) and northing (y) in metres, effectively reversing the EPSG:3857 projection.

## 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": [
      "x",
      "y"
     ],
     "properties": {
      "x": {
       "type": "number",
       "description": "Easting in metres (±20037508.34)."
      },
      "y": {
       "type": "number",
       "description": "Northing in metres (±20037508.34)."
      }
     },
     "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/web-mercator-to-wgs84-inverse-projection-d04b6309/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)