Escape velocity API

Returns the escape velocity v=sqrt(2mu/r) from a body surface or a given radius, using bundled planetary constants. Answers 'What is Earth's escape velocity?', 'Escape speed from the Moon?'.

Price$0.02per request

MethodPOST

Route/v1/space/escape-velocity

StatusLive

MIME typeapplication/json

Rate limit120/minute

Cache0s public

spaceastronomyescape-velocityorbital-mechanicsastrodynamicsrocketdelta-vgravity

API URLhttps://x402.hexl.dev/v1/space/escape-velocity

Integration docs

Example request

{
  "body": "earth"
}

Example response

{
  "body": "earth",
  "mu": 398600441800000,
  "radiusM": 6371000,
  "escapeVelocityMs": 11186.1357,
  "escapeVelocityKms": 11.18614,
  "interpretation": "Escape from 6371 km radius needs 11.186 km/s (sqrt(2)x circular speed)."
}

Input schema

{
  "type": "object",
  "properties": {
    "body": {
      "type": "string",
      "examples": [
        "earth"
      ]
    },
    "mu": {
      "type": "number"
    },
    "centralMassKg": {
      "type": "number"
    },
    "radiusM": {
      "type": "number"
    }
  }
}

Output schema

{
  "type": "object",
  "additionalProperties": true
}