# Server402 API Marketplace

> Discover, pay for, and call HTTP 402 protected APIs. This marketplace is designed for AI agents, MCP clients, and applications that can complete x402 or Server402 payment flows.

Server402 exposes paid APIs as machine-readable catalog entries, OpenAPI operations, and MCP tools. Use the catalog search endpoint to find an API for a task, inspect the JSON Schemas, call the API once to receive HTTP 402 payment instructions, complete payment, then retry with the returned payment token or x402 signature.

## Essential Discovery

- [Well-known Server402 manifest](https://aivps.lat/.well-known/server402.json): canonical entry point for agents.
- [RFC 9727 API catalog](https://aivps.lat/.well-known/api-catalog): linkset discovery for OpenAPI, docs, metadata, status, services, and MCP.
- [APIs.json](https://aivps.lat/apis.json): API sitemap for directories and API-aware crawlers.
- [Agent guide](https://aivps.lat/ai.txt): plain-text workflow for discovery, payment, retry, and errors.
- [API catalog](https://aivps.lat/api/catalog): machine-readable list of paid APIs with pricing, schemas, examples, quality, and discovery hints.
- [Catalog search](https://aivps.lat/api/catalog/search?q=ocr): natural-language search over services. Replace `ocr` with the task.
- [OpenAPI 3.1](https://aivps.lat/openapi.json): root alias for OpenAPI importers.
- [MCP endpoint](https://aivps.lat/mcp): Streamable HTTP MCP endpoint exposing published services as tools.
- [AI discovery audit](https://aivps.lat/api/discovery/audit): machine-readable readiness report for indexing, search, MCP, OpenAPI, and payment flow.
- [Sitemap](https://aivps.lat/sitemap.xml): URLs intended for indexing.

## Payment Workflow

1. Search `GET /api/catalog/search?q=your-task` or read `GET /api/catalog`.
2. Choose a service by `id`, `descriptionForModel`, `inputSchema`, `outputSchema`, price, and quality.
3. Call the service endpoint without payment to receive `402 Payment Required`, payment metadata, and x402 accepts when available.
4. Complete or verify payment with `POST /api/payments` and `GET /api/payments/{paymentId}` when using Server402 token flow.
5. Retry the same HTTP request with `X-Payment-Token: payment.token`, or retry the MCP tool with `paymentToken`.

## API Service Highlights

- `word-count` POST /api/tools/word-count: Count Unicode characters, whitespace-delimited words, and lines in a text string. Price: USD 0.05. Tags: text, utility, analysis.
  Service llms.txt: https://aivps.lat/services/word-count/llms.txt
- `slugify` POST /api/tools/slugify: Convert an English title into a lowercase URL-safe slug. Price: USD 0.05. Tags: text, seo, utility.
  Service llms.txt: https://aivps.lat/services/slugify/llms.txt
- `timestamp` GET /api/tools/timestamp: Return the current server time in UTC RFC3339 format and Unix seconds. Price: USD 0.03. Tags: time, utility.
  Service llms.txt: https://aivps.lat/services/timestamp/llms.txt
- `proxy-health` GET /api/tools/proxy-health: 通过 backendUrl 转发到真实服务的付费代理示例。 Price: USD 0.03. Tags: .
  Service llms.txt: https://aivps.lat/services/proxy-health/llms.txt
- `random-uuid` GET /api/tools/random-uuid: Generate a random UUID by calling a third-party HTTP API. Price: USD 0.05. Tags: uuid, random, utility.
  Service llms.txt: https://aivps.lat/services/random-uuid/llms.txt
- `hk-weather` GET /api/tools/hk-weather: Get current weather in Hong Kong, including temperature, relative humidity, and wind speed, from Open-Meteo. Price: USD 0.05. Tags: weather, hong kong, temperature, humidity, wind.
  Service llms.txt: https://aivps.lat/services/hk-weather/llms.txt
- `multilingual-ocr` POST /api/tools/multilingual-ocr: Recognize printed text from a public image URL. Use this OCR API for mixed or unknown-language images; pass optional language and layout hints when the schema supports them. Price: USD 0.20. Tags: ocr, image, text-extraction, document-processing, multilingual, multi language, auto language, 通用多语言, 小语种.
  Service llms.txt: https://aivps.lat/services/multilingual-ocr/llms.txt
- `aliyun-docmind-trade-package-extract` POST /api/tools/aliyun-docmind-trade-package-extract: Submit a Trade Document Package extraction job to Alibaba Cloud Document Mind from a public file URL. Price: USD 0.30. Tags: aliyun, document-mind, docmind, document-extraction.
  Service llms.txt: https://aivps.lat/services/aliyun-docmind-trade-package-extract/llms.txt
- `aliyun-docmind-doc-parser-submit` POST /api/tools/aliyun-docmind-doc-parser-submit: Submit a large-model document parsing job to Alibaba Cloud Document Mind from a public file URL. Price: USD 0.30. Tags: aliyun, document-mind, docmind, document-understanding.
  Service llms.txt: https://aivps.lat/services/aliyun-docmind-doc-parser-submit/llms.txt
- `aliyun-docmind-doc-parser-status` POST /api/tools/aliyun-docmind-doc-parser-status: Query the processing status of an Alibaba Cloud Document Mind large-model document parsing job. Price: USD 0.05. Tags: aliyun, document-mind, docmind, document-understanding.
  Service llms.txt: https://aivps.lat/services/aliyun-docmind-doc-parser-status/llms.txt
- `aliyun-docmind-doc-parser-result` POST /api/tools/aliyun-docmind-doc-parser-result: Fetch parsed layout and content results for an Alibaba Cloud Document Mind large-model job. Price: USD 0.05. Tags: aliyun, document-mind, docmind, document-understanding.
  Service llms.txt: https://aivps.lat/services/aliyun-docmind-doc-parser-result/llms.txt
- `aliyun-docmind-doc-structure-submit` POST /api/tools/aliyun-docmind-doc-structure-submit: Submit a document structure parsing job to Alibaba Cloud Document Mind from a public file URL. Price: USD 0.30. Tags: aliyun, document-mind, docmind, document-understanding.
  Service llms.txt: https://aivps.lat/services/aliyun-docmind-doc-structure-submit/llms.txt
- `aliyun-docmind-doc-structure-result` POST /api/tools/aliyun-docmind-doc-structure-result: Fetch document structure parsing results from Alibaba Cloud Document Mind by job ID. Price: USD 0.05. Tags: aliyun, document-mind, docmind, document-understanding.
  Service llms.txt: https://aivps.lat/services/aliyun-docmind-doc-structure-result/llms.txt
- `aliyun-docmind-digital-doc-structure-submit` POST /api/tools/aliyun-docmind-digital-doc-structure-submit: Submit a digital document structure parsing job to Alibaba Cloud Document Mind from a public file URL. Price: USD 0.30. Tags: aliyun, document-mind, docmind, document-understanding.
  Service llms.txt: https://aivps.lat/services/aliyun-docmind-digital-doc-structure-submit/llms.txt
- `aliyun-docmind-table-understanding-submit` POST /api/tools/aliyun-docmind-table-understanding-submit: Submit a table understanding job to Alibaba Cloud Document Mind from a public file URL. Price: USD 0.30. Tags: aliyun, document-mind, docmind, document-understanding.
  Service llms.txt: https://aivps.lat/services/aliyun-docmind-table-understanding-submit/llms.txt
- `aliyun-docmind-table-understanding-result` POST /api/tools/aliyun-docmind-table-understanding-result: Fetch table understanding results from Alibaba Cloud Document Mind by job ID. Price: USD 0.05. Tags: aliyun, document-mind, docmind, document-understanding.
  Service llms.txt: https://aivps.lat/services/aliyun-docmind-table-understanding-result/llms.txt
- `aliyun-docmind-document-extract-submit` POST /api/tools/aliyun-docmind-document-extract-submit: Submit a document extraction job to Alibaba Cloud Document Mind from a public file URL. Price: USD 0.30. Tags: aliyun, document-mind, docmind, document-extraction.
  Service llms.txt: https://aivps.lat/services/aliyun-docmind-document-extract-submit/llms.txt
- `aliyun-docmind-document-extract-result` POST /api/tools/aliyun-docmind-document-extract-result: Fetch document extraction results from Alibaba Cloud Document Mind by job ID. Price: USD 0.05. Tags: aliyun, document-mind, docmind, document-extraction.
  Service llms.txt: https://aivps.lat/services/aliyun-docmind-document-extract-result/llms.txt
- `aliyun-docmind-document-compare-result` POST /api/tools/aliyun-docmind-document-compare-result: Fetch document comparison results from Alibaba Cloud Document Mind by job ID. Price: USD 0.05. Tags: aliyun, document-mind, docmind, document-understanding.
  Service llms.txt: https://aivps.lat/services/aliyun-docmind-document-compare-result/llms.txt
- `aliyun-docmind-pdf-to-word-submit` POST /api/tools/aliyun-docmind-pdf-to-word-submit: Submit a PDF-to-Word conversion job to Alibaba Cloud Document Mind from a public file URL. Price: USD 0.30. Tags: aliyun, document-mind, docmind, document-conversion.
  Service llms.txt: https://aivps.lat/services/aliyun-docmind-pdf-to-word-submit/llms.txt
- `aliyun-docmind-pdf-to-image-submit` POST /api/tools/aliyun-docmind-pdf-to-image-submit: Submit a PDF-to-image conversion job to Alibaba Cloud Document Mind from a public file URL. Price: USD 0.30. Tags: aliyun, document-mind, docmind, document-conversion.
  Service llms.txt: https://aivps.lat/services/aliyun-docmind-pdf-to-image-submit/llms.txt
- `aliyun-docmind-pdf-to-excel-submit` POST /api/tools/aliyun-docmind-pdf-to-excel-submit: Submit a PDF-to-Excel conversion job to Alibaba Cloud Document Mind from a public file URL. Price: USD 0.30. Tags: aliyun, document-mind, docmind, document-conversion.
  Service llms.txt: https://aivps.lat/services/aliyun-docmind-pdf-to-excel-submit/llms.txt
- `aliyun-docmind-pdf-to-markdown-submit` POST /api/tools/aliyun-docmind-pdf-to-markdown-submit: Submit a PDF-to-Markdown conversion job to Alibaba Cloud Document Mind from a public file URL. Price: USD 0.30. Tags: aliyun, document-mind, docmind, document-conversion.
  Service llms.txt: https://aivps.lat/services/aliyun-docmind-pdf-to-markdown-submit/llms.txt
- `aliyun-docmind-image-to-word-submit` POST /api/tools/aliyun-docmind-image-to-word-submit: Submit an image-to-Word conversion job to Alibaba Cloud Document Mind from public image URLs. Price: USD 0.30. Tags: aliyun, document-mind, docmind, document-conversion.
  Service llms.txt: https://aivps.lat/services/aliyun-docmind-image-to-word-submit/llms.txt
- `aliyun-docmind-image-to-pdf-submit` POST /api/tools/aliyun-docmind-image-to-pdf-submit: Submit an image-to-PDF conversion job to Alibaba Cloud Document Mind from public image URLs. Price: USD 0.30. Tags: aliyun, document-mind, docmind, document-conversion.
  Service llms.txt: https://aivps.lat/services/aliyun-docmind-image-to-pdf-submit/llms.txt
- `aliyun-docmind-image-to-excel-submit` POST /api/tools/aliyun-docmind-image-to-excel-submit: Submit an image-to-Excel conversion job to Alibaba Cloud Document Mind from public image URLs. Price: USD 0.30. Tags: aliyun, document-mind, docmind, document-conversion.
  Service llms.txt: https://aivps.lat/services/aliyun-docmind-image-to-excel-submit/llms.txt
- `aliyun-docmind-image-to-markdown-submit` POST /api/tools/aliyun-docmind-image-to-markdown-submit: Submit an image-to-Markdown conversion job to Alibaba Cloud Document Mind from public image URLs. Price: USD 0.30. Tags: aliyun, document-mind, docmind, document-conversion.
  Service llms.txt: https://aivps.lat/services/aliyun-docmind-image-to-markdown-submit/llms.txt
- `aliyun-docmind-document-convert-result` POST /api/tools/aliyun-docmind-document-convert-result: Fetch document conversion results from Alibaba Cloud Document Mind by job ID. Price: USD 0.05. Tags: aliyun, document-mind, docmind, document-conversion.
  Service llms.txt: https://aivps.lat/services/aliyun-docmind-document-convert-result/llms.txt
- `aliyun-docmind-page-num` POST /api/tools/aliyun-docmind-page-num: Fetch page count metadata from Alibaba Cloud Document Mind by business ID. Price: USD 0.05. Tags: aliyun, document-mind, docmind, document-utility.
  Service llms.txt: https://aivps.lat/services/aliyun-docmind-page-num/llms.txt
- `english-ocr` POST /api/tools/english-ocr: Recognize printed text from a public image URL. Use this OCR API for English document images; pass optional language and layout hints when the schema supports them. Price: USD 0.20. Tags: ocr, image, text-extraction, document-processing, english, eng, 英语, 英文.
  Service llms.txt: https://aivps.lat/services/english-ocr/llms.txt
- Additional services are available in the full catalog: 116 total published APIs.

## Notes For AI Agents

- Prefer English service descriptions and schema descriptions when selecting tools; localized names and keywords are supplementary.
- Published, enabled, and healthy services appear in the AI catalog and MCP tools list.
- Service calls may require a public image URL or exact upstream parameter names; always follow `inputSchema`.
- `402 Payment Required` is expected before payment and should not be treated as terminal failure.