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Length

Calculate the length of a line in meters. 
POST /compute/v0/length

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Request Body

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chainId
number
required
Target chain ID (e.g., 84532 for Base Sepolia, 8453 for Base).
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geometry
Input
required
The line geometry to measure.
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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/length \
  -H "Content-Type: application/json" \
  -d '{
    "chainId": 84532,
    "geometry": "0xline...",
    "schema": "0xschema...",
    "recipient": "0xdef456..."
  }'

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Example Response

{
  "result": 2345.67,
  "units": "meters",
  "operation": "length",
  "timestamp": 1706400000,
  "inputRefs": [
    "0xline..."
  ],
  "attestation": {
    "schema": "0x...",
    "attester": "0x...",
    "recipient": "0xdef456...",
    "data": "0x...",
    "signature": "0x..."
  },
  "delegatedAttestation": {
    "signature": "0x...",
    "attester": "0x...",
    "deadline": 1706403600
  }
}

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Notes

  • Uses PostGIS ST_Length function with geodetic calculation
  • Result is in meters with centimeter precision
  • Valid for LineString and MultiLineString geometries

SDK Method

See astral.compute.length()