LegendTrade Market Data API

openapi: 3.1.0
info:
  title: Legend Info Health Market Data API
  version: 0.1.0
  summary: Hyperliquid-compatible info API with local processing, operated by Legend (legend.trade).
  description: 'The public read surface of Legend''s trading platform, served at https://api.legend.trade. The service self-identifies as `@legend/hl-node` v0.1.0 — "Hyperliquid-compatible info API with local processing" — and mirrors the Hyperliquid `POST /info` request-type convention while adding Legend-specific endpoints (`/sparklines`) and an operator-authenticated wallet registration surface used for fill tracking.

    This description was GENERATED by the API Evangelist enrichment pipeline from the API''s own self-describing root document (GET https://api.legend.trade) and from live probes of each endpoint on 2026-07-19. Legend publishes an `openapi.json` at docs.legend.trade/api-reference/openapi.json, but as of this run that file is the unmodified Mintlify "OpenAPI Plant Store" scaffold and does not describe the Legend API — it was deliberately NOT harvested. Request/response schemas below are typed only where a live response was observed; unobserved shapes are left open rather than invented.'
  contact:
    name: Legend
    url: https://docs.legend.trade
  x-api-evangelist:
    method: generated
    generated: '2026-07-19'
    source: https://api.legend.trade (self-describing root document) + live endpoint probes
    upstream: https://hyperliquid.xyz
servers:
- url: https://api.legend.trade
  description: Production
security:
- bearerAuth: []
tags:
- name: Market Data
  description: Legend-specific market data extensions.
paths:
  /sparklines:
    get:
      operationId: getSparklines
      tags:
      - Market Data
      summary: 24h price sparklines for multiple coins
      description: Legend-custom endpoint. Returns 24 hours of close-price candles keyed by coin symbol. Candle entries carry `t` (epoch milliseconds) and `c` (close price as a string).
      security: []
      parameters:
      - name: coins
        in: query
        required: true
        description: Comma-separated coin symbols, e.g. `BTC,ETH`.
        schema:
          type: string
        example: BTC,ETH
      responses:
        '200':
          description: Sparklines keyed by coin symbol.
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/SparklineMap'
              example:
                BTC:
                  candles:
                  - t: 1784409300000
                    c: '64720'
                  - t: 1784411100000
                    c: '64729'
  /sparklines/{coin}:
    get:
      operationId: getCoinSparkline
      tags:
      - Market Data
      summary: 24h price sparkline for a single coin
      security: []
      parameters:
      - name: coin
        in: path
        required: true
        description: Coin symbol, e.g. `BTC`.
        schema:
          type: string
        example: BTC
      responses:
        '200':
          description: Sparkline for the requested coin.
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/SparklineMap'
components:
  schemas:
    SparklineMap:
      type: object
      description: Sparklines keyed by coin symbol.
      additionalProperties:
        $ref: '#/components/schemas/Sparkline'
    Candle:
      type: object
      properties:
        t:
          type: integer
          description: Candle timestamp, epoch milliseconds.
        c:
          type: string
          description: Close price, decimal string.
    Sparkline:
      type: object
      properties:
        candles:
          type: array
          items:
            $ref: '#/components/schemas/Candle'
  securitySchemes:
    bearerAuth:
      type: http
      scheme: bearer
      description: The `/wallets/*` endpoints are authenticated — unauthenticated requests return `401 {"error":"Unauthorized"}`. Legend does not publish the credential format for this operator surface; `bearer` is recorded as the observed-unauthenticated default and is NOT a documented provider claim.