# Unpaywall

1 endpoint on Unpaywall. Every one returns the same response shape and has a flat, published price in credits.

Category: [Science & research](https://onekey.dev/docs/categories/science.md) · [Overview page](https://onekey.dev/platforms/unpaywall)

## Endpoints

| Endpoint | What it does | Cost | Status |
| --- | --- | --- | --- |
| [`doi`](https://onekey.dev/docs/api/unpaywall/doi.md) | Open-access status and best free full-text location of a DOI (Unpaywall). | 1 credit | stable |

Every endpoint page has a **Field mapping** section showing which source field becomes which [unified field](https://onekey.dev/docs/schema.md) (fixed schema) or platform-specific `ext.` field.