openapi: 3.1.0
info:
  title: CoinGecko Crypto Market Data Asset Platforms API
  description: The CoinGecko Crypto Market Data API provides comprehensive and reliable cryptocurrency price and market data through RESTful JSON endpoints. It offers over 70 endpoints covering real-time and historical prices, trading volumes, market capitalization, OHLCV data, exchange information, NFT metrics, derivatives data, and public treasury holdings for over 18,000 coins. The Demo API plan provides free access with 30 calls per minute to a subset of 30 publicly accessible endpoints.
  version: 3.0.1
  contact:
    name: CoinGecko Support
    url: https://support.coingecko.com
  termsOfService: https://www.coingecko.com/en/terms
servers:
- url: https://api.coingecko.com/api/v3
  description: CoinGecko Demo API Server
security:
- demoApiKeyHeader: []
- demoApiKeyQuery: []
tags:
- name: Asset Platforms
  description: List all asset platforms (blockchains) supported by CoinGecko.
paths:
  /asset_platforms:
    get:
      operationId: getAssetPlatforms
      summary: List asset platforms
      description: Get the list of all asset platforms (blockchains) supported by CoinGecko. Each platform includes its chain identifier and native coin ID.
      tags:
      - Asset Platforms
      parameters:
      - name: filter
        in: query
        description: Filter by platform type (e.g., nft to get NFT-supported platforms)
        schema:
          type: string
      responses:
        '200':
          description: Success
          content:
            application/json:
              schema:
                type: array
                items:
                  $ref: '#/components/schemas/AssetPlatform'
components:
  schemas:
    AssetPlatform:
      type: object
      properties:
        id:
          type: string
          description: Asset platform identifier
        chain_identifier:
          type: integer
          description: Blockchain chain ID
        name:
          type: string
          description: Asset platform display name
        shortname:
          type: string
          description: Short name abbreviation
        native_coin_id:
          type: string
          description: CoinGecko ID of the native coin
  securitySchemes:
    demoApiKeyHeader:
      type: apiKey
      in: header
      name: x-cg-demo-api-key
      description: CoinGecko Demo API key passed via request header. Obtain a free key from the CoinGecko developer dashboard.
    demoApiKeyQuery:
      type: apiKey
      in: query
      name: x_cg_demo_api_key
      description: CoinGecko Demo API key passed via query string parameter.
externalDocs:
  description: CoinGecko API Documentation
  url: https://docs.coingecko.com