# Unpaywall DOI Lookup API

**Canonical:** https://apis.io/apis/unpaywall/unpaywall-doi-lookup-api/  
**Provider:** Unpaywall — https://apis.io/providers/unpaywall/  
**Base URL:** https://api.unpaywall.org/v2  
**Documentation:** https://unpaywall.org/products/api

Unpaywall DOI Lookup API is one of 2 APIs that [Unpaywall](https://apis.io/providers/unpaywall/) publishes on the [APIs.io](https://apis.io/) network, described by a machine-readable OpenAPI specification. This API exposes 1 JSON Schema definition. Tagged areas include DOI Lookup. The published artifact set on APIs.io includes an OpenAPI specification, API documentation, and 1 JSON Schema.

Look up open access status by DOI

## Machine-readable artifacts (5)

- **OpenAPI** — https://raw.githubusercontent.com/api-evangelist/unpaywall/refs/heads/main/openapi/unpaywall-doi-lookup-api-openapi.yml
- **Documentation** — https://unpaywall.org/products/api
- **SpectralRules** — https://raw.githubusercontent.com/api-evangelist/unpaywall/refs/heads/main/rules/unpaywall-rules.yml
- **JSONSchema** — https://raw.githubusercontent.com/api-evangelist/unpaywall/refs/heads/main/json-schema/unpaywall-article-schema.json
- **APIsJSON** — https://raw.githubusercontent.com/api-evangelist/unpaywall/refs/heads/main/apis.yml

## Other Unpaywall APIs (1)

- [Unpaywall Search API](https://apis.io/apis/unpaywall/unpaywall-search-api/)

## Tags

DOI Lookup

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Profiled by [API Evangelist](https://apievangelist.com) and published on [APIs.io](https://apis.io/apis/unpaywall/unpaywall-doi-lookup-api/). The API's provider profile, Kin Score and agent-readiness rating are at https://apis.io/providers/unpaywall/.