As a JSON-RPC 2.0 API, Ankr Advanced API provides the single entry endpoint https://rpc.ankr.com/multichain/ for calls to all methods.

A really illustrative example is a call to the ankr_getBlock method:

curl --request POST \
     --url 'https://rpc.ankr.com/multichain/?ankr_getBlocks=' \
     --header 'accept: application/json' \
     --header 'content-type: application/json' \
     --data '
{
  "jsonrpc": "2.0",
  "method": "ankr_getBlocks"
}
'

As you can see, cURL sends a request to https://rpc.ankr.com/multichain/ with the method name ankr_getBlocks as a query parameter.

You can find method names and detailed method descriptions in the ADVANCED API CALLS section in the sidebar menu on the left.