Geomagnetic ap Index, 3-Hourly (GFZ Potsdam)

gfzkpindex/ap-index

The geomagnetic ap index from GFZ Potsdam, the linear equivalent amplitude of the Kp index, one value per 3-hour UTC interval over a time range you give, each with a status of pre (preliminary) or def (definitive). Use it where a linear measure of geomagnetic disturbance is needed instead of the quasi-logarithmic Kp. GFZ data under CC BY 4.0, passed through unmodified and served by Eden Engine; not an official GFZ product.

activeper callv1

Price

$0.0026 per call

You pay the price shown. If a call turns out to cost more than its quote, you pay the actual price, capped at twice the quote. No monthly minimum. Top-ups start at $5.

Data source

GFZ German Research Centre for Geosciences

Data from the GFZ German Research Centre for Geosciences (GFZ Helmholtz Centre Potsdam), kp.gfz.de, licensed CC BY 4.0; cite Matzka et al. (2021). Served by Eden Engine; not an official GFZ product.

Use it

Five steps: search, inspect, learn, run, settle. No per-tool setup; your agent reaches this tool through the meta-tools it already has.

Connect once and your AI can find and run this tool, and any other it needs.

Install it Create an account

agent

// 1. search: find the tool
omnial_search({ query: "what you need" })

// 2. inspect: price and input schema
omnial_inspect({ tool: "gfzkpindex/ap-index" })

// 3. learn: read the usage guide at runtime
omnial_learn({ tool: "gfzkpindex/ap-index" })

// 4. run: price the exact call first, then run it
omnial_execute({ tool: "gfzkpindex/ap-index", input: { /* see input_schema */ }, dry_run: true })
omnial_execute({ tool: "gfzkpindex/ap-index", input: { /* ... */ } })

// 5. settle: the call is charged when it finishes, nothing to do

Not connected yet? Point your MCP client at https://mcp.eden-engine.com/mcp, then copy a config for your client.

Pricing

Every charge this tool can incur.

Charge	Price
Per call	$0.0026

Updated: Oct 21, 2026

Input and output schemas

Input schema

input_schema.json

{
  "type": "object",
  "required": [
    "start",
    "end"
  ],
  "properties": {
    "end": {
      "type": "string",
      "pattern": "^[0-9]{4}-[0-9]{2}-[0-9]{2}T[0-9]{2}:[0-9]{2}:[0-9]{2}Z$",
      "description": "End of the range, UTC, in the form 2026-10-18T00:00:00Z."
    },
    "start": {
      "type": "string",
      "pattern": "^[0-9]{4}-[0-9]{2}-[0-9]{2}T[0-9]{2}:[0-9]{2}:[0-9]{2}Z$",
      "description": "Start of the range, UTC, in the form 2026-10-17T00:00:00Z."
    }
  },
  "additionalProperties": false
}

Output schema

output_schema.json

{
  "type": "object",
  "required": [
    "datetime",
    "ap"
  ],
  "properties": {
    "ap": {
      "type": "array",
      "items": {
        "type": "number"
      },
      "description": "ap values (an integer-valued linear scale in units of 2 nT, for example 5.0 and 12.0), one per 3-hour interval."
    },
    "meta": {
      "type": "object",
      "description": "The service's licence and source (CC BY 4.0, GFZ Potsdam).",
      "additionalProperties": true
    },
    "status": {
      "type": "array",
      "items": {
        "type": "string"
      },
      "description": "Per value: pre (preliminary, nowcast) or def (definitive)."
    },
    "datetime": {
      "type": "array",
      "items": {
        "type": "string"
      },
      "description": "UTC start time of each 3-hour interval; same length and order as the values."
    }
  },
  "additionalProperties": true
}