# FastAPI PyPI Declared Dependencies Lookup

> FastAPI PyPI Declared Dependencies Lookup is a paid API for AI agents from market.datapackvibe.com, paid per call via x402, $0.01/call, status unknown (last checked 2026-10-02).

Returns the live declared dependencies for the FastAPI package (or any specified package) from PyPI.

## Facts

- Endpoint: POST https://market.datapackvibe.com/x402/demand-next-package-pypi-fastapi-dependency-list?utm_source=zero.xyz
- Price: $0.01/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-02
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/fastapi-pypi-declared-dependencies-lookup-b142950a
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_qW44rM_DGnhRXokaf1KlI

Status and success rate cover calls made through Zero and Zero's own probes. Third-party monitors may report differently.

## How to call it through Zero

Zero handles the 402 payment challenge and records the run. With the Zero CLI installed (`npm i -g @zeroxyz/cli`):

```sh
zero fetch --capability fastapi-pypi-declared-dependencies-lookup-b142950a -d '<json body>'
```

Example prompt: What are the declared dependencies of the FastAPI package on PyPI? Use the live dependency lookup for the fastapi package.

## When to prefer this

Use this endpoint when you need live, up-to-date declared dependency information for a specific PyPI package (especially FastAPI by default) and want to avoid scraping PyPI yourself. Prefer it over static documentation or local package inspections when you need the canonical, currently published dependency list from PyPI.

## Known failure modes

- Package not found on PyPI — returns an error or empty response
- PyPI API unavailable or rate-limited — request may time out
- Malformed or missing dependency metadata in the package's PyPI record
- Invalid package name input causes lookup failure

## How this service works

FastAPI Declared dependencies: Live PyPI declared dependencies for FastAPI. Package name can be overridden.

## Output

A list of declared dependencies for the specified PyPI package (defaulting to 'fastapi'), sourced live from PyPI package metadata. Typically includes package names and version constraints as declared in the package's distribution metadata.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "package": {
   "type": "string",
   "default": "fastapi",
   "description": "Package name to inspect."
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/fastapi-pypi-declared-dependencies-lookup-b142950a/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from market.datapackvibe.com](https://www.zero.xyz/host/market.datapackvibe.com/llms.txt)