Weaviate Cloud clusters expose REST at /v1 and GraphQL at /v1/graphql on their own URL.
Copy an API key from your cluster in Weaviate Cloud and send it as Authorization: Bearer <key>. In the examples it's written {{WEAVIATE_API_KEY}}; {{WEAVIATE_HOST}} is your cluster's host.
Full reference: https://docs.weaviate.io/weaviate/api/rest
Version and enabled modules.
curl https://{{WEAVIATE_HOST}}/v1/meta \
-H "Authorization: Bearer {{WEAVIATE_API_KEY}}"
curl https://{{WEAVIATE_HOST}}/v1/schema \
-H "Authorization: Bearer {{WEAVIATE_API_KEY}}"