Polygon

Polygon Books API

Level-2 order book.

Documentation GitHub OpenAPI

Operations 1

GET /v2/snapshot/locale/global/markets/crypto/tickers/{ticker}/book Get Level Two Book For A Crypto Pair #

Work with this as data

Every API here is available over the APIs.io API and to AI agents over MCP.

MCP server

One button, every client — Claude, Cursor, VS Code and the rest.

https://apis.io/mcp

Tools for apis

7 MCP tools reach this

find_apisBrowse and filter every API in the catalog.
get_api_artifactsOne API's artifacts, grouped by type.
get_openapiThe primary OpenAPI for this API.
find_similar_apisAPIs that look like this one.
apis_io_searchSTART HERE — APIs, providers and tags for one query, each with its total.
resolveTurn a domain, URL or GitHub org into the provider it belongs to.
find_cohortsEvery scored population of providers in the catalog.

All 92 tools →

Call it yourself

curl for this page

This API

curl "https://apis.io/api/v1/apis/polygon-books-api"

All apis

curl "https://apis.io/api/v1/apis?limit=25"

Discovery needs no key. Ratings and market analysis are Pro.

Get an API key

Free tier, no form to fill in. Signing in shares your email address with us — we store it to create your key and to recognise you if you sign in with another provider. See our Privacy Policy and Terms.

GitHub Google LinkedIn

A second provider on the same verified email joins the account you already have.

OpenAPI Specification

openapi: 3.2.0
info:
  title: Polygon Crypto REST Aggregates Books API
  version: '1.0'
  description: 'Polygon Crypto API exposes aggregated cross-exchange data for crypto

    pairs (e.g., X:BTCUSD) via `https://api.polygon.io`. This spec

    covers aggregates, daily open/close, snapshots, and level-2 books.

    Auth uses an API key via `apiKey` query parameter or

    `Authorization: Bearer`.

    '
  contact:
    name: Polygon Documentation
    url: https://polygon.io/docs/crypto
servers:
- url: https://api.polygon.io
  description: Polygon REST API
security:
- apiKeyQuery: []
- bearerAuth: []
tags:
- name: Books
  description: Level-2 order book.
paths:
  /v2/snapshot/locale/global/markets/crypto/tickers/{ticker}/book:
    get:
      tags:
      - Books
      operationId: getCryptoL2Book
      summary: Get Level Two Book For A Crypto Pair
      description: Returns the current Level-2 book for a crypto ticker.
      parameters:
      - in: path
        name: ticker
        required: true
        schema:
          type: string
      responses:
        '200':
          description: Level-2 book response
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/CryptoBookResponse'
components:
  schemas:
    BookLevel:
      type: object
      properties:
        p:
          type: number
          description: Price level.
        x:
          type: object
          additionalProperties:
            type: number
          description: Map of exchange ID to size.
    CryptoBookResponse:
      type: object
      properties:
        status:
          type: string
        request_id:
          type: string
        data:
          type: object
          properties:
            ticker:
              type: string
            bids:
              type: array
              items:
                $ref: '#/components/schemas/BookLevel'
            asks:
              type: array
              items:
                $ref: '#/components/schemas/BookLevel'
            bidCount:
              type: number
            askCount:
              type: number
            spread:
              type: number
            updated:
              type: integer
              format: int64
  securitySchemes:
    apiKeyQuery:
      type: apiKey
      in: query
      name: apiKey
    bearerAuth:
      type: http
      scheme: bearer
      bearerFormat: API Key

Polygon Books API

Operations 1

Documentation

Specifications

Schemas & Data

Other Resources