# Assyro developer docs

Query FDA 510(k) clearances, the Orange Book, the Purple Book, FDA letters, inspections and regulations from your own code through the Assyro public data API.

Source: https://www.assyro.com/docs

> **Note:** Preview: `api.assyro.com` is not serving production data yet. Requests and responses on this page follow the published contract and may change before launch.

The Assyro public data API gives your code the same regulatory and FDA records the [Assyro databases](https://www.assyro.com/tools) publish: 510(k) clearances, the FDA Orange Book and Purple Book, FDA letters, inspections, guidance and regulations. Every record carries its source, so you can trace each value back to the agency that published it.

- [Quickstart](https://www.assyro.com/docs/quickstart): Send your first query in under a minute.
- [API reference](https://www.assyro.com/docs/api): The query endpoint, its envelope and every operation.
- [Errors](https://www.assyro.com/docs/errors): The error envelope and every code it can carry.
- [Rate limits](https://www.assyro.com/docs/rate-limits): What each caller may send, and how to read the limits.
- [Sources](https://www.assyro.com/docs/sources): Every regulatory and FDA source the API serves, with its parameters.
- [Connect AI tools](https://www.assyro.com/docs/mcp): Use Assyro from Claude, ChatGPT, Codex and Cursor through MCP.

## How it works

One endpoint, `POST https://api.assyro.com/v1/query`, answers every query. The body names an `operation` (a database and an action, such as `device-510k.search`) and its `input`. Every response carries the data, the state of the source it came from, and pagination when the operation returns a list.

## Databases

**Databases on the Assyro public data API**

| Family | Covers | Operations |
|---|---|---|
| `device-510k` | FDA 510(k) premarket notifications and device classification | 6 |
| `orange-book` | FDA Orange Book drugs, patents and exclusivity | 8 |
| `purple-book` | FDA Purple Book licensed biologics and biosimilars | 9 |
| `letters` | FDA approval, complete response and warning letters | 5 |
| `inspections` | FDA inspection classifications, citations and Form 483s | 7 |
| `guidance` | FDA guidance documents | 5 |
| `legal` | 21 CFR, the US Code and other regulations | 6 |
| `pdufa` | PDUFA goal dates | 4 |

The reference documents 510(k) first, the first database to go live. The others follow as each one is served.