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Research Preview — This API is under development.

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Within

Check if a geometry is within a specified radius of a target geometry. 
POST /compute/v0/within

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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).
​
geometry
Input
required
The geometry to check (typically a point).
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target
Input
required
The target geometry to measure distance from.
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radius
number
required
Maximum distance in meters.
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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/within \
  -H "Content-Type: application/json" \
  -d '{
    "chainId": 84532,
    "geometry": "0xpoint...",
    "target": "0xlandmark...",
    "radius": 500,
    "schema": "0xschema...",
    "recipient": "0xdef456..."
  }'

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Example Response

{
  "result": true,
  "operation": "within:50000",
  "timestamp": 1706400000,
  "inputRefs": [
    "0xpoint...",
    "0xlandmark..."
  ],
  "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_DWithin function
  • Radius is always in meters (no unit conversion)
  • Returns true if the distance between geometries is less than or equal to the radius
  • The operation field includes the radius in centimeters: within:RADIUS_CM (e.g., within:50000 for a 500m radius). Resolver contracts should use prefix matching, not exact string comparison

SDK Method

See astral.compute.within()