# Collections

{% openapi src="<https://www.openindex.ai/index.yaml>" path="/collections" method="get" %}
<https://www.openindex.ai/index.yaml>
{% endopenapi %}

{% openapi src="<https://www.openindex.ai/index.yaml>" path="/collections" method="post" %}
<https://www.openindex.ai/index.yaml>
{% endopenapi %}

List publicly-accessible URLs, one per line, in the `knowledgeBase` parameter. Any YouTube URL will be transcribed and index.

Use `links(<url>)` to index all direct links in `url`.

{% openapi src="<https://www.openindex.ai/index.yaml>" path="/collections/search" method="get" %}
<https://www.openindex.ai/index.yaml>
{% endopenapi %}

The `/collections/search` endpoint will run a hybrid similarity search of your query passed as parameter `q` and return the chunks and collections with the highest semantic similarity after a re-ranking step.

This endpoint can be used as an action in your custom OpenAI GPTs. Search the full OpenIndex.ai knowledge base by adding a new function to your custom GPT with this OpenAPI [json schema](https://www.openindex.ai/.well-known/gptaction.json).

If you want to only search a specific collection in your custom GPT, use the json schema URL `https://www.openindex.ai/actions/gpt?collection_id=<collection_id>`. We now show that URL in the main collection page, see for example the collection [Vitalik's Essays](https://www.openindex.ai/collection/9lo9KTEbcFUD49pZtQmv).&#x20;

For now only public OpenIndex.ai collections can be retrieved. We are looking to implement OAuth login with OpenAI GPT to also allow for private and team collections search.