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Distance

Calculate the distance between two geometries in meters. 
POST /compute/v0/distance

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Request Body

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chainId
number
required
Target chain ID. All UIDs must exist on this chain.
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from
Input
required
First geometry. Can be a UID, GeoJSON, or offchain attestation reference.
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to
Input
required
Second geometry. Can be a UID, GeoJSON, or offchain attestation reference.
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schema
string
required
EAS schema UID to issue the attestation against.
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recipient
string
Ethereum address to receive the attestation. Defaults to zero address if not provided.

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Example Request

curl -X POST https://api.astral.global/compute/v0/distance \
  -H "Content-Type: application/json" \
  -d '{
    "chainId": 84532,
    "from": "0xabc123...",
    "to": {
      "type": "Point",
      "coordinates": [2.2945, 48.8584]
    },
    "schema": "0xschema...",
    "recipient": "0xdef456..."
  }'

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Response

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result
number
required
Distance in meters (e.g., 523.45)
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units
string
required
Always “meters”
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operation
string
required
Always “distance”
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timestamp
number
required
Unix timestamp of computation
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inputRefs
string[]
required
Array of input references (UIDs or geometry hashes)
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attestation
object
required
The signed attestation object
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delegatedAttestation
object
required
Signature for delegated onchain submission

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Example Response

{
  "result": 523.45,
  "units": "meters",
  "operation": "distance",
  "timestamp": 1706400000,
  "inputRefs": [
    "0xabc123...",
    "0x7d3e8f..."
  ],
  "attestation": {
    "schema": "0x...",
    "attester": "0x...",
    "recipient": "0xdef456...",
    "data": "0x...",
    "signature": "0x..."
  },
  "delegatedAttestation": {
    "signature": "0x...",
    "attester": "0x...",
    "deadline": 1706403600
  }
}

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Notes

  • Distance is calculated using PostGIS ST_Distance with geodetic coordinates
  • Result is in meters with centimeter precision (rounded to 0.01m)
  • For raw GeoJSON inputs, a keccak256 hash is used in inputRefs

SDK Method

See astral.compute.distance()