curl --request POST \
  --url https://api.jup.ag/prediction/v1/follow/{ownerPubkey} \
  --header 'Content-Type: application/json' \
  --header 'x-api-key: <api-key>' \
  --data '
{
  "followerPubkey": "<string>"
}
'

{
  "followerPubkey": "<string>",
  "followingPubkey": "<string>",
  "createdAt": "<string>"
}