Distance Calculator (Geodesic)
Distance calculator: distance and direction between WGS-84 coordinates: geodesic distance by Vincenty with a haversine fallback, initial and final bearing, the midpoint, and the destination point reached from a start point on a given bearing and distance. Also computes the cumulative length of a supplied coordinate path. Results in metres, kilometres, nautical miles and miles.
Offering
- Provider
- api.duoleads.com
- Method
- GET
- Offering type
- Api Endpoint
- Transport type
- http
- Category
- Location And Travel
- Delivery
- Not provided
- Pricing model
- Not provided
- x402 version
- 2
Endpoint context
- URL
https://api.duoleads.com/v1/geo/distance- MIME type
- application/json
- First seen
- 2026-10-16T01:50:38.788Z
- Last seen
- Tags
- distance, distance-calculator, haversine, geodesy, Geo
Payment pricing
x402 payment terms are the authoritative price for calling this endpoint.
- Payment option 1
- 0.05 USDC
Atomic price: 50000 · Network: eip155:8453 · Asset: USDC · Scheme: exact
Raw x402 terms
[
{
"scheme": "exact",
"network": "eip155:8453",
"asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
"amount": "50000",
"payTo": "0xCD673f7e1daD254347AEab6be0DEFe8b9C6b3A39"
}
]Observed health
- Status
- Healthy
- Latest latency
- 1210 ms
- Average latency
- 984 ms
- HTTP status
- 402
- Last checked
- Reachability
- 100% over 14 checks
Latency is measured to the first response headers. A reachable result does not verify response accuracy or merchant identity.
Input schema
{
"type": "object",
"properties": {
"type": {
"type": "string",
"const": "http"
},
"method": {
"type": "string",
"enum": [
"GET"
]
},
"queryParams": {
"type": "object",
"properties": {
"op": {
"type": "string",
"description": "distance (default), destination, midpoint or path.",
"enum": [
"distance",
"destination",
"midpoint",
"path"
],
"maxLength": 64,
"default": "distance"
},
"lat1": {
"type": "string",
"description": "Start latitude.",
"pattern": "^[+-]?(\\d+(\\.\\d*)?|\\.\\d+)([eE][+-]?\\d+)?$",
"maxLength": 64
},
"lon1": {
"type": "string",
"description": "Start longitude.",
"pattern": "^[+-]?(\\d+(\\.\\d*)?|\\.\\d+)([eE][+-]?\\d+)?$",
"maxLength": 64
},
"lat2": {
"type": "string",
"description": "End latitude.",
"pattern": "^[+-]?(\\d+(\\.\\d*)?|\\.\\d+)([eE][+-]?\\d+)?$",
"maxLength": 64
},
"lon2": {
"type": "string",
"description": "End longitude.",
"pattern": "^[+-]?(\\d+(\\.\\d*)?|\\.\\d+)([eE][+-]?\\d+)?$",
"maxLength": 64
},
"bearing": {
"type": "string",
"description": "Initial bearing in degrees for op=destination.",
"pattern": "^[+-]?(\\d+(\\.\\d*)?|\\.\\d+)([eE][+-]?\\d+)?$",
"maxLength": 64
},
"distance_m": {
"type": "string",
"description": "Distance in metres for op=destination, 0 to 1e9 (about 25 Earth circumferences); larger values are 400 INVALID_PARAM.",
"pattern": "^[+-]?(\\d+(\\.\\d*)?|\\.\\d+)([eE][+-]?\\d+)?$",
"maxLength": 64
},
"path": {
"type": "string",
"description": "Comma-separated lat,lon pairs for op=path, at most 200 points.",
"maxLength": 2048
},
"method": {
"type": "string",
"description": "vincenty (default, WGS-84) or haversine.",
"enum": [
"vincenty",
"haversine"
],
"maxLength": 64,
"default": "vincenty"
}
},
"required": []
}
},
"required": [
"type",
"method"
],
"additionalProperties": false
}Output schema
{
"$schema": "https://json-schema.org/draft/2020-12/schema",
"properties": {
"input": {
"additionalProperties": false,
"properties": {
"method": {
"enum": [
"GET"
],
"type": "string"
},
"queryParams": {
"properties": {
"bearing": {
"description": "Initial bearing in degrees for op=destination.",
"maxLength": 64,
"pattern": "^[+-]?(\\d+(\\.\\d*)?|\\.\\d+)([eE][+-]?\\d+)?$",
"type": "string"
},
"distance_m": {
"description": "Distance in metres for op=destination, 0 to 1e9 (about 25 Earth circumferences); larger values are 400 INVALID_PARAM.",
"maxLength": 64,
"pattern": "^[+-]?(\\d+(\\.\\d*)?|\\.\\d+)([eE][+-]?\\d+)?$",
"type": "string"
},
"lat1": {
"description": "Start latitude.",
"maxLength": 64,
"pattern": "^[+-]?(\\d+(\\.\\d*)?|\\.\\d+)([eE][+-]?\\d+)?$",
"type": "string"
},
"lat2": {
"description": "End latitude.",
"maxLength": 64,
"pattern": "^[+-]?(\\d+(\\.\\d*)?|\\.\\d+)([eE][+-]?\\d+)?$",
"type": "string"
},
"lon1": {
"description": "Start longitude.",
"maxLength": 64,
"pattern": "^[+-]?(\\d+(\\.\\d*)?|\\.\\d+)([eE][+-]?\\d+)?$",
"type": "string"
},
"lon2": {
"description": "End longitude.",
"maxLength": 64,
"pattern": "^[+-]?(\\d+(\\.\\d*)?|\\.\\d+)([eE][+-]?\\d+)?$",
"type": "string"
},
"method": {
"default": "vincenty",
"description": "vincenty (default, WGS-84) or haversine.",
"enum": [
"vincenty",
"haversine"
],
"maxLength": 64,
"type": "string"
},
"op": {
"default": "distance",
"description": "distance (default), destination, midpoint or path.",
"enum": [
"distance",
"destination",
"midpoint",
"path"
],
"maxLength": 64,
"type": "string"
},
"path": {
"description": "Comma-separated lat,lon pairs for op=path, at most 200 points.",
"maxLength": 2048,
"type": "string"
}
},
"required": [],
"type": "object"
},
"type": {
"const": "http",
"type": "string"
}
},
"required": [
"type",
"method"
],
"type": "object"
},
"output": {
"properties": {
"example": {
"properties": {
"data": {
"properties": {
"bearing_final": {
"type": "number"
},
"bearing_initial": {
"type": "number"
},
"converged": {
"type": "boolean"
},
"destination": {
"properties": {
"lat": {
"type": "number"
},
"lon": {
"type": "number"
}
},
"required": [
"lat",
"lon"
],
"type": "object"
},
"distance": {
"properties": {
"km": {
"type": "number"
},
"m": {
"type": "number"
},
"mi": {
"type": "number"
},
"nmi": {
"type": "number"
}
},
"required": [
"m",
"km",
"nmi",
"mi"
],
"type": "object"
},
"legs": {
"type": "integer"
},
"method": {
"type": "string"
},
"midpoint": {
"properties": {
"lat": {
"type": "number"
},
"lon": {
"type": "number"
}
},
"required": [
"lat",
"lon"
],
"type": "object"
},
"points": {
"type": "integer"
}
},
"required": [
"method",
"converged"
],
"type": "object"
},
"meta": {
"properties": {
"computed_at": {
"description": "RFC 3339 UTC with milliseconds",
"type": "string"
},
"deterministic": {
"type": "boolean"
},
"disclaimer": {
"type": "string"
},
"price_usd": {
"type": "string"
},
"request_id": {
"type": "string"
},
"sources": {
"items": {
"required": [
"id",
"version",
"published"
],
"type": "object"
},
"type": "array"
}
},
"required": [
"request_id",
"computed_at",
"price_usd",
"deterministic",
"disclaimer"
],
"type": "object"
},
"ok": {
"const": true
},
"route": {
"const": "/v1/geo/distance"
},
"version": {
"type": "string"
}
},
"required": [
"ok",
"route",
"version",
"data",
"meta"
],
"type": "object"
},
"type": {
"type": "string"
}
},
"required": [
"type"
],
"type": "object"
}
},
"required": [
"input"
],
"type": "object"
}