qn_estimatePriorityFees method, my node is a free node ,is this matters ?

[cocktailalochol]

curl -X POST -H "content-type:application/json" --data '{"method":"qn_estimatePriorityFees","params":["4UH2DZsF5yeSysDBcBSHXGLxtk4UX7GDEKZyXvzVZf3p"],"id":1,"jsonrpc":"2.0"}'

{"jsonrpc":"2.0","error":{"code":-32601,"message":"Method not found"},"id":1}