Runs three detectors over one series and reports what each saw

Runs three detectors over one series and reports what each saw: a robust z score on median and median absolute deviation, a robust seasonal-trend decomposition with a z score on the residual, and an isolation forest over value and step-to-previous. Every score is returned per point, so callers set their own threshold instead of trusting a verdict. The forest draws from a fixed seed: same request, same result. Under three full cycles the seasonal figure is marked as not robust.

Paid test badge: not yet. The checks above are free: we call the tool without paying and read the payment request it sends back. The Verified badge needs paid calls whose answers match the promised output, and nobody can buy a badge.

Endpoint

POST https://tools.halowerk.com/v1/series/anomaly

Our checks, last 30 days

Example input (from the provider)

{
  "body": {
    "contamination": 0.1,
    "methods": [
      "robust_z",
      "isolation_forest"
    ],
    "min_votes": 2,
    "points": [
      12.1,
      12.4,
      11.9,
      12.3,
      12,
      12.2,
      48.7,
      12.1,
      11.8,
      12.5,
      12.2,
      12
    ],
    "seed": 42
  },
  "bodyType": "json",
  "method": "POST",
  "type": "http"
}

Promised output schema (from the provider)

{
  "$schema": "https://json-schema.org/draft/2020-12/schema",
  "properties": {
    "input": {
      "additionalProperties": false,
      "properties": {
        "body": {
          "properties": {
            "contamination": {
              "default": 0.02,
              "description": "Expected share of outliers. Sets where the isolation forest cuts.",
              "maximum": 0.5,
              "minimum": 0.0001,
              "type": "number"
            },
            "methods": {
              "default": [
                "robust_z",
                "stl_residual",
                "isolation_forest"
              ],
              "description": "Which detectors to run.",
              "items": {
                "enum": [
                  "robust_z",
                  "stl_residual",
                  "isolation_forest"
                ],
                "type": "string"
              },
              "maxItems": 3,
              "minItems": 1,
              "type": "array"
            },
            "min_votes": {
              "default": 1,
              "description": "How many detectors must agree before a point is called an anomaly.",
              "maximum": 3,
              "minimum": 1,
              "type": "integer"
            },
            "points": {
              "description": "Either plain numbers or objects with value and optionally time_unix_s (seconds since 1970), time (ISO 8601) and label. The service caps the whole request body at 256 KB, so long records reach that limit before maxItems.",
              "maxItems": 5000,
              "minItems": 3,
              "type": "array"
            },
            "robust_z_threshold": {
              "default": 3.5,
              "description": "Absolute robust z score at which a point counts as an outlier.",
              "maximum": 20,
              "minimum": 0.5,
              "type": "number"
            },
            "sample_size": {
              "default": 256,
              "description": "Points drawn per tree, capped at the series length.",
              "maximum": 1024,
              "minimum": 8,
              "type": "integer"
            },
            "season_period": {
              "default": 0,
              "description": "Points per season, e.g. 24 for hourly data with a daily rhythm. 0 leaves the seasonal part out.",
              "maximum": 1000,
              "minimum": 0,
              "type": "integer"
            },
            "seed": {
              "default": 42,
              "description": "Fixed starting value for the forest. Same seed, same answer.",
              "maximum": 2147483647,
              "minimum": 0,
              "type": "integer"
            },
            "stl_z_threshold": {
              "default": 3.5,
              "description": "Threshold on the robust z score of the residual.",
              "maximum": 20,
              "minimum": 0.5,
              "type": "number"
            },
            "trees": {
              "default": 100,
              "description": "Number of isolation trees.",
              "maximum": 300,
              "minimum": 10,
              "type": "integer"
            }
          },
          "required": [
            "points"
          ],
          "type": "object"
        },
        "bodyType": {
          "enum": [
            "json",
            "form-data",
            "text"
          ],
          "type": "string"
        },
        "method": {
          "enum": [
            "POST"
          ],
          "type": "string"
        },
        "type": {
          "const": "http",
          "type": "string"
        }
      },
      "required": [
        "type",
        "method",
        "bodyType",
        "body"
      ],
      "type": "object"
    },
    "output": {
      "properties": {
        "example": {
          "type": "object"
        },
        "type": {
          "type": "string"
        }
      },
      "required": [
        "type"
      ],
      "type": "object"
    }
  },
  "required": [
    "input"
  ],
  "type": "object"
}

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