> ## Documentation Index > Fetch the complete documentation index at: https://docs.gowinston.ai/llms.txt > Use this file to discover all available pages before exploring further. # Fact checker > The Fact Checker endpoint is a powerful tool designed to verify the accuracy of a given piece of content by checking it against a a variety of trusted sources. The cost is 2 credits per word. ## OpenAPI ````yaml POST /v2/fact-checker openapi: 3.0.1 info: title: Winston AI API description: Winston AI API specification license: name: MIT version: 4.11.4 servers: - url: https://api.gowinston.ai/ security: - bearerAuth: [] paths: /v2/fact-checker: post: description: >- The Fact Checker endpoint is a powerful tool designed to verify the accuracy of a given piece of content by checking it against a a variety of trusted sources. The cost is 2 credits per word. requestBody: description: The Fact Checker request body content: application/json: schema: $ref: '#/components/schemas/FactCheckerRequest' required: true responses: '200': description: Fact Checker response content: application/json: schema: $ref: '#/components/schemas/FactCheckerResponse' '400': description: Bad Request content: application/json: schema: type: object properties: error: type: string default: BAD_REQUEST description: type: string default: >- The request was invalid and could not be processed. Make sure you pass valid arguments. '401': description: Unauthorized content: application/json: schema: type: object properties: error: type: string default: UNAUTHORIZED description: type: string default: >- Pass a valid API key in the Authorization header as a Bearer token. '402': description: Payment Required (insufficient credits) content: application/json: schema: type: object properties: error: type: string default: PAYMENT_REQUIRED description: type: string default: >- Insufficient credits. Make sure you have enough credits to make the request. '403': description: Forbidden content: application/json: schema: type: object properties: error: type: string default: FORBIDDEN description: type: string default: >- The request was forbidden. Make sure you pass a valid URL or document that we can access. '415': description: Unsupported Media Type content: application/json: schema: type: object properties: error: type: string default: UNSUPPORTED_MEDIA_TYPE description: type: string default: >- The request content type is not supported. Make sure you pass a valid content type. '429': description: Too Many Requests content: application/json: schema: type: object properties: error: type: string default: TOO_MANY_REQUESTS description: type: string default: You have exceeded the rate limit. Please try again later. '500': description: Internal Server Error content: application/json: schema: type: object properties: error: type: string default: INTERNAL_SERVER_ERROR description: type: string default: An unexpected error occurred. Please try again later. '503': description: Service Unavailable content: application/json: schema: type: object properties: error: type: string default: SERVICE_UNAVAILABLE description: type: string default: >- The service is currently unavailable. Please try again later. components: schemas: FactCheckerRequest: type: object required: - text properties: text: description: >- The text to scan. It is required except if you supply a website or a file. Minimum 300 characters. Maximum 10,000 characters per request. type: string file: description: >- A publicly accessible URL to a file to scan. The file must be publicly available online (not a local file path) so our API can access it. The file must be in plain .pdf, .doc or .docx format. The file has priority over the text, so if you give a text and a file, it's the file that will be scanned. type: string website: description: >- A website URL to scan. If you supply a website, the API will fetch the content of the website and scan it. The website must be publicly accessible. It's important to know that the website has priority over the text and the file, so if you give a text, a file and a website, it's the website that will be scanned. type: string language: description: >- 2 letter language code. Default: auto. If you put 'auto', the API will automatically detect the language based on the text. Supported languages: Arabic (ar), Bengali (bn), Bulgarian (bg), Chinese simplified and traditional (zh), Croatian (hr), Czech (cs), Danish (da), Dutch (nl), English (en), Estonian (et), Finnish (fi), French (fr), German (de), Greek (el), Hebrew (he), Hindi (hi), Hungarian (hu), Indonesian (id), Italian (it), Japanese (ja), Korean (ko), Latvian (lv), Lithuanian (lt), Norwegian (no), Polish (pl), Portuguese (pt), Romanian (ro), Russian (ru), Serbian (sr), Slovak (sk), Slovenian (sl), Spanish (es), Swahili (sw), Swedish (sv), Thai (th), Turkish (tr), Ukrainian (uk), Vietnamese (vi). type: string default: auto FactCheckerResponse: type: object properties: status: type: integer description: HTTP status code for the response example: 200 claims: type: array description: >- List of claims detected in the text along with their fact-checking results. items: type: object properties: id: type: integer description: The unique identifier of the sentence in the input text. example: 1 sentence: type: string description: Exact input sentence from which the claim was extracted. claim: type: string description: The distinct claim to be fact-checked. verdict: type: string description: Fact-checking verdict about the claim. enum: - SUPPORTED - PARTIALLY_SUPPORTED - NOT_ENOUGH_EVIDENCE - REFUTED score: type: integer description: Confidence score (0-100) for the verdict. example: 100 explanation: type: string description: >- Explanation of the verdict, including supporting reasoning and factual basis. links: type: array description: List of supporting sources for the claim. items: type: object properties: url: type: string description: URL of the supporting reference. title: type: string description: Title or domain of the referenced article. score: type: integer description: Overall confidence score (0-100) that the provided text is accurate. example: 100 claimsCount: type: integer description: >- Total number of claims extracted from the text. Maximum 12 per request. example: 11 text: type: string description: The full original text that was analyzed. sentences: type: array description: >- List of sentences from the analyzed text, with IDs for mapping claims to the sentences. items: type: object properties: id: type: integer description: Unique identifier for the sentence in the input text. example: 1 text: type: string description: Sentence text. input: type: string description: Indicates the input type, e.g., 'text', 'file', or 'website'. language: type: string description: Detected or specified input language (2 letter code). example: en creditsUsed: type: integer description: The number of credits used to process this request. example: 1234 creditsRemaining: type: integer description: The number of remaining credits for the account. example: 34567 wordCount: type: integer description: Word count of the input text. example: 617 securitySchemes: bearerAuth: type: http scheme: bearer ````