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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).
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geometry
Input
required
The geometry to check (typically a point). See Input types for accepted formats.
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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
EAS schema UID. The server uses a default schema if not provided.
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recipient
string
Ethereum address to receive the attestation. Defaults to the zero address.

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Example request

curl -X POST https://api.astral.global/compute/v0/within \
  -H "Content-Type: application/json" \
  -H "X-API-Key: your-api-key" \
  -d '{
    "chainId": 84532,
    "geometry": "0xpoint...",
    "target": "0xlandmark...",
    "radius": 500,
    "recipient": "0xdef456..."
  }'

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Response

Returns a BooleanComputeResponse.
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result
boolean
required
true if the geometry is within the radius of the target.
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operation
string
required
Encodes the radius in centimeters: "within:RADIUS_CM" (e.g., "within:50000" for a 500m radius).
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timestamp
number
required
Unix timestamp of computation.
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inputRefs
string[]
required
Array containing [geometryRef, targetRef].
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attestation
AttestationData
required
Signed EAS attestation. See AttestationData.
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delegatedAttestation
DelegatedAttestationData
required
Signature for delegated onchain submission. See DelegatedAttestationData.

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Example response

{
  "result": true,
  "operation": "within:50000",
  "timestamp": 1706400000,
  "inputRefs": [
    "0xpoint...",
    "0xlandmark..."
  ],
  "attestation": {
    "schema": "0x...",
    "attester": "0x590fdb53ed3f0B52694876d42367192a5336700F",
    "recipient": "0xdef456...",
    "data": "0x...",
    "revocable": true,
    "refUID": "0x0000000000000000000000000000000000000000000000000000000000000000",
    "signature": "0x..."
  },
  "delegatedAttestation": {
    "signature": "0x...",
    "attester": "0x590fdb53ed3f0B52694876d42367192a5336700F",
    "deadline": 1706403600,
    "nonce": 0
  }
}

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Notes

  • Uses PostGIS ST_DWithin function
  • Radius is always in meters in the request (no unit conversion needed)
  • The operation field encodes the radius in centimeters: within:50000 means 500 meters. Resolver contracts should use prefix matching, not exact string comparison
  • Returns true if the distance between geometries is less than or equal to the radius

SDK Method

See astral.compute.within()