# REST API Error Codes | Error Codes | Desccription | | ----------- | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------ | | 503 | The number of candlestick data requests exceeds the allowed limit. | | 505 | The number of requested symbols exceeds the allowed quota. | | 508 | The requested symbol does not exist or has been delisted. | | 401 | Authentication failed. The API Key is invalid, missing, or not included in the required header or query parameter. | | 404 | The requested API endpoint was not found. | | 429 | Request rate limit exceeded. Your request frequency is higher than the quota allowed for your current plan. | | 499 | Client-side disconnection. Typically occurs in regions with unstable network connections. Please retry under a stable network environment. | | 524 | Origin server connection timed out. Usually caused by temporary instability between our CDN provider and the origin server. The issue typically resolves itself shortly. | --- # Agent Instructions: Querying This Documentation If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question. Perform an HTTP GET request on the current page URL with the `ask` query parameter: ``` GET https://docs.infoway.io/en-docs/getting-started/error-codes/rest-api-error-codes.md?ask= ``` The question should be specific, self-contained, and written in natural language. The response will contain a direct answer to the question and relevant excerpts and sources from the documentation. Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.