POST /length

Calculate length of a line

Research Preview — This API is under development.

Length

Calculate the length of a line in meters.

POST /compute/v0/length

Request Body

chainId · number · required

Target chain ID (e.g., 84532 for Base Sepolia, 8453 for Base).

geometry · Input · required

The line geometry to measure.

schema · string · required

EAS schema UID to issue the attestation against.

recipient · string

Ethereum address to receive the attestation. Defaults to zero address if not provided.

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..."
  }'

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
  }
}

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()