Endpoint: master.json

Reference for the growthepie master.json endpoint, the canonical metadata index for chains, metrics, and coverage.

master.json is the canonical metadata index for the public growthepie API. master.json answers the core discovery questions directly: which chains are covered, which metrics are supported, what units each metric uses, which chains support each metric, which chains should be excluded because they are stale, and when the metadata was last updated.

Request

GET https://api.growthepie.com/v1/master.json

Key Facts

• Auth: not required

• Best use case: discovery, metadata, coverage, and schema-aware clients

• Response type: object

• Includes: chains, metrics, da_layers, da_metrics, sources, maturity_levels, last_updated_utc

• Chain deployment safety field: deployment in the current live API, and deployment_flag if present on other environments

Example Response

{
  "current_version": "v1",
  "last_updated_utc": "2026-03-27 05:30:09",
  "chains": {
    "arbitrum": {
      "name": "Arbitrum One",
      "url_key": "arbitrum",
      "supported_metrics": [
        "tvl",
        "txcount",
        "daa",
        "stables_mcap",
        "fees",
        "rent_paid",
        "profit",
        "txcosts",
        "fdv",
        "market_cap",
        "throughput",
        "app_revenue"
      ]
    }
  },
  "metrics": {
    "txcount": {
      "name": "Transaction Count",
      "metric_keys": ["txcount"],
      "hourly_available": true
    }
  }
}

When To Use master.json

• Before validating an origin_key

• Before validating a metric_id

• Before deciding whether a metric has hourly detail

• Before deciding whether a chain supports a given metric

• Before excluding stale chains whose deployment or deployment_flag is DEV or ARCHIVED

FAQ

Should I hardcode supported chains?

Prefer master.json over hardcoding. master.json is the intended machine-readable discovery file for chain and metric coverage.

Where do I find the raw metric_key mapping?

Use master.json.metrics.{metric_id}.metric_keys.

Which chains should I exclude because of stale data?

Exclude any chain whose deployment is DEV or ARCHIVED.

Related Pages

• What Is origin_key?

• What Is owner_project?

• What Is metric_key?

• Supported Chains And origin_key