A typical response from the Messari Crypto API will be in JSON format and will look like the following: 
{
  "error": null,
  "data": {
    // Data specific to the API endpoint
  },
  "metadata": {
    // Additional contextual information (optional).
  }
}

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Fields Explained

FieldTypeDescriptionUsage
errorstring or nullThis field indicates whether an error occurred during the API request. If the request was successful, this field will be ⁠null. If there was an error, it will contain a descriptive error message explaining what went wrong.Always check this field first to determine if your API call was successful before attempting to access the ⁠data
dataobject (varies based on the endpoint)This field contains the actual response data returned by the API. The structure of this object will vary depending on the specific endpoint being called.After confirming there is no error, you can access this field to retrieve the requested information
metadataobject or ⁠null (optional)This optional field may include additional contextual information related to the API response, such as pagination details, request duration, or trace information. If there are no additional details to provide, the ⁠metadata field may be omitted entirely from the response.If present, this field can provide useful insights for managing and optimizing your API usage.
When working with the Messari Crypto API, always check the error field in the JSON response to determine if your request was successful. If error is null, proceed to access the data field for the necessary information. Additionally, review the metadata field, if available, for extra context regarding your API call. This standardized response structure helps ensure that developers can consistently handle and interpret API responses effectively across all endpoints.

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Example JSON Response

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Successful Response

In a successful response, the API returns the requested data along with any relevant metadata: 
{
  "error": null,
  "data": {
    "messages": [
      {
        "role": "assistant",
        "content": "### Overview of Hyperliquid HyperEVM\n\n**Hyperliquid HyperEVM** is an innovative integration of the Ethereum Virtual Machine (EVM) into Hyperliquid's Layer 1 blockchain, announced on February 18, 2025. \n\n#### Key Features and Highlights:\n1. **EVM Integration**: HyperEVM allows for enhanced programmability and performance for Ethereum-compatible smart contracts within the Hyperliquid ecosystem.\n2. **Spot Transfers**: The initial release supports spot transfers between native HYPE and HyperEVM HYPE.\n3. **DeFi Enhancement**: The HyperEVM includes elements such as a canonical WHYPE system contract to support decentralized financial applications.\n4. **Security and Consensus**: It maintains robust security through HyperBFT consensus, ensuring reliable operation within the network.\n5. **Performance Improvements**: The integration aims to provide high transaction capacity and low fees, leveraging Hyperliquid's highly optimized trading infrastructure.\n\n#### Additional Developments:\n- **Bug Bounty Program**: To enhance security, a bug bounty program was launched offering substantial rewards for identifying vulnerabilities in the system.\n- **Future Upgrades**: Plans include enabling ERC-20 native transfers and additional precompiles to expand functionality.\n\nThis new integration positions Hyperliquid as a comprehensive DeFi ecosystem, aiming to leverage the strengths of EVM with the robust infrastructure of its native blockchain."
      }
    ]
  },
  "metadata": {
    "status": "Completed",
    "trace_id": "df89a737-b988-4643-97ba-08645ef8bd77"
  }
}

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Error Response

If an error occurs, the response will provide information about the error: 
{
  "error": "Invalid API key",
  "data": null
}
For more information on handling errors and the status codes that accompany unsuccessful requests, see the errors page.

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Pagination

Many Messari API endpoints that return multiple items support pagination to help you navigate through large result sets. Pagination information is included in the metadata field of the response. The pagination structure contains the following attributes: 
{
  "limit": 10,
  "page": 1,
  "totalRows": 100,
  "totalPages": 10
}

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Request ID

Each API request has an associated request identifier. You can find this value in the response headers, under x-request-id. To expedite the resolution process, provide the request identifier when you contact us about a specific request.