> ## Documentation Index > Fetch the complete documentation index at: https://docs.glassmarkets.io/llms.txt > Use this file to discover all available pages before exploring further. # Get header price, volume and exchange coverage > Compact price, 24-hour volume and exchange coverage for an asset. The one-hour price change compares the latest minute's median TWAP with the first minute's average TWAP. The 24-hour change compares that latest price with the first hour's average TWAP. Optional end times default to the current minute and hour, respectively. ## OpenAPI ````yaml /openapi.yaml get /v2/metrics/header-summary/ openapi: 3.0.3 info: title: Glass Market API version: 1.0.0 x-logo: url: https://api.glassmarkets.io/static/black.png backgroundColor: '#FFFFFF' altText: Glass Market API description: > Guides, a quickstart and code samples are at [docs.glassmarkets.io](https://docs.glassmarkets.io). The API serves the data behind the GlassMarkets app: market data collected from crypto exchanges, and market-making data for the assets your organizations work on. The [Authentication guide](https://docs.glassmarkets.io/guides/authentication) covers login: `POST /v1/login/` returns a token that goes on every request as `Authorization: Token `. servers: - url: https://api.glassmarkets.io security: [] tags: - name: Authentication description: Log in, log out and read the current session. - name: Organizations description: Your organizations, and the assets, exchanges and pairs each one covers. - name: Reported metrics description: Volume, depth and spread that market makers report for their assets. - name: Trusted metrics description: >- Volume, depth and spread that Shield measures directly from market makers' exchange accounts. - name: Market maker metrics description: >- Market-maker volume, depth, spread, uptime and coverage, combining trusted and reported data. - name: Targets description: >- Market-making targets per asset, exchange and pair, and whether they are met. - name: Market data description: >- Exchange market data for your assets: volume, spread, order book depth, slippage, uptime, futures and more. - name: Leaderboard description: Trading pairs across exchanges, ranked by market data. - name: Loans description: Token loans to market makers for your assets. - name: RFQ description: >- Requests for quotes: a project invites market makers to propose market-making terms for its token. - name: Account description: Manage your password, passkeys and two-factor authentication. externalDocs: url: https://docs.glassmarkets.io description: Guides, quickstart and code samples paths: /v2/metrics/header-summary/: get: tags: - Market data summary: Get header price, volume and exchange coverage description: >- Compact price, 24-hour volume and exchange coverage for an asset. The one-hour price change compares the latest minute's median TWAP with the first minute's average TWAP. The 24-hour change compares that latest price with the first hour's average TWAP. Optional end times default to the current minute and hour, respectively. operationId: v2_metrics_header_summary_get parameters: - in: query name: asset schema: type: string maxLength: 100 minLength: 1 example: BTC required: true - in: query name: hourly_end schema: type: string format: date-time - in: query name: minutely_end schema: type: string format: date-time responses: '200': content: application/json: schema: $ref: '#/components/schemas/MetricsHeaderSummaryResponse' examples: BTCHeaderSummary: value: price_now: 83410 price_change_1h: 0.42 price_change_24h: 2.17 volume_24h: 1791000000 exchanges: - slug: binance name: Binance icon_url: >- https://s2.coinmarketcap.com/static/img/exchanges/64x64/630.png - slug: coinbasepro name: Coinbase Pro icon_url: >- https://s2.coinmarketcap.com/static/img/exchanges/64x64/89.png summary: BTC header summary description: '' '400': description: A field is missing or invalid. content: application/json: schema: $ref: '#/components/schemas/ValidationErrors' examples: InvalidInput: value: asset: - This field is required. '401': $ref: '#/components/responses/ApiKeyUnauthorized' '403': $ref: '#/components/responses/ApiKeyForbidden' security: - metricsApiKeyAuth: [] - tokenAuth: [] x-codeSamples: - lang: bash label: cURL source: |- curl --request GET \ --url 'https://api.glassmarkets.io/v2/metrics/header-summary/?asset=BTC' \ --header 'Authorization: ApiKey ' - lang: python label: Python source: >- import requests url = "https://api.glassmarkets.io/v2/metrics/header-summary/?asset=BTC" headers = {"Authorization": "ApiKey "} response = requests.get(url, headers=headers) print(response.text) - lang: javascript label: JavaScript source: >- const options = {method: 'GET', headers: {Authorization: 'ApiKey '}}; fetch('https://api.glassmarkets.io/v2/metrics/header-summary/?asset=BTC', options) .then(res => res.json()) .then(res => console.log(res)) .catch(err => console.error(err)); - lang: go label: Go source: "package main\n\nimport (\n\t\"fmt\"\n\t\"net/http\"\n\t\"io\"\n)\n\nfunc main() {\n\n\turl := \"https://api.glassmarkets.io/v2/metrics/header-summary/?asset=BTC\"\n\n\treq, _ := http.NewRequest(\"GET\", url, nil)\n\n\treq.Header.Add(\"Authorization\", \"ApiKey \")\n\n\tres, _ := http.DefaultClient.Do(req)\n\n\tdefer res.Body.Close()\n\tbody, _ := io.ReadAll(res.Body)\n\n\tfmt.Println(string(body))\n\n}" - lang: java label: Java source: >- HttpResponse response = Unirest.get("https://api.glassmarkets.io/v2/metrics/header-summary/?asset=BTC") .header("Authorization", "ApiKey ") .asString(); components: schemas: MetricsHeaderSummaryResponse: type: object properties: price_now: type: number format: double nullable: true price_change_1h: type: number format: double nullable: true price_change_24h: type: number format: double nullable: true volume_24h: type: number format: double exchanges: type: array items: $ref: '#/components/schemas/ExchangeResponse' required: - exchanges - price_change_1h - price_change_24h - price_now - volume_24h ValidationErrors: type: object description: >- One entry per invalid field; `non_field_errors` covers the request as a whole. A field carries a list of messages or a single message; a nested field carries an object, or a list of objects, of the same shape. additionalProperties: anyOf: - type: array items: type: string - type: string - type: object - type: array items: type: object ExchangeResponse: type: object properties: slug: type: string name: type: string icon_url: type: string format: uri required: - icon_url - name - slug ErrorDetail: type: object properties: detail: type: string required: - detail responses: ApiKeyUnauthorized: description: The token or API key is missing, invalid, expired or revoked. content: application/json: schema: $ref: '#/components/schemas/ErrorDetail' examples: InvalidToken: value: detail: Invalid token. MissingToken: value: detail: Authentication credentials were not provided. InvalidApiKey: value: detail: Invalid or expired API key. ApiKeyForbidden: description: The API key does not have the scope this endpoint needs. content: application/json: schema: $ref: '#/components/schemas/ErrorDetail' examples: MissingScope: value: detail: API key does not have access to this endpoint. securitySchemes: metricsApiKeyAuth: type: apiKey in: header name: Authorization description: >- Scoped API key with required prefix "ApiKey ". Available scopes: metrics:read and reported_metrics:write. x-default: ApiKey tokenAuth: type: apiKey in: header name: Authorization description: >- Token-based authentication with required prefix "Token ". Example: "Token 9944b09199c62bcf9418ad846dd0e4bbdfc6ee4b" x-default: Token ```` This documentation is built and hosted on [Mintlify](https://mintlify.com), a developer documentation platform.