Fetch the policy constants

{
  "data": {
    "stakingContractAddress": "NQ77 0000 0000 0000 0000 0000 0000 0000 0001",
    "coinbaseAddress": "NQ81 C01N BASE 0000 0000 0000 0000 0000 0000",
    "transactionValidityWindow": 7200,
    "maxSizeMicroBody": 100000,
    "version": 1,
    "slots": 512,
    "blocksPerBatch": 60,
    "batchesPerEpoch": 720,
    "blocksPerEpoch": 43200,
    "validatorDeposit": 10000000000,
    "minimumStake": 10000000,
    "totalSupply": 2100000000000000,
    "blockSeparationTime": 1000,
    "jailEpochs": 8,
    "genesisBlockNumber": 3032010
  },
  "metadata": null
}