https://skmtc.dev/avax/apis/core-balance-api/docs/v1/balance/get-balances/post 2026-10-12 0.5 https://skmtc.dev/avax/apis/core-balance-api/docs/v1/balance/get-supported-chains/get 2026-10-12 0.5 https://skmtc.dev/avax/apis/core-balance-api/docs/v1/stake/get-rewards/post 2026-10-12 0.5