openapi: 3.0.0 info: title: Arkham Intel Analytics Marketdata API version: 1.1.0 tags: - name: Marketdata paths: /marketdata/altcoin_index: get: summary: Get Altcoin Index description: Returns the current Altcoin Index value, which measures altcoin performance relative to Bitcoin. operationId: GetAltcoinIndexAPI responses: '200': description: OK content: application/json: schema: $ref: '#/components/schemas/GetAltcoinIndexResponse' '500': description: Internal Server Error tags: - Marketdata components: schemas: GetAltcoinIndexResponse: required: - altcoinIndex type: object properties: altcoinIndex: type: integer description: Altcoin Index value from 0 to 100. Higher values indicate altcoins are outperforming Bitcoin. example: 63 example: altcoinIndex: 63