--- title: "Protocol parameters" method: GET path: "/epochs/{number}/parameters" tags: ["Cardano » Epochs"] --- # Protocol parameters `GET /epochs/{number}/parameters` Return the protocol parameters for the epoch specified. ## Path parameters - `number` integer, required ## Response `200` Return the data about the epoch - EpochParamContent - `epoch` integer, required — Epoch number - `min_fee_a` integer, required — The linear factor for the minimum fee calculation for given epoch - `min_fee_b` integer, required — The constant factor for the minimum fee calculation - `max_block_size` integer, required — Maximum block body size in Bytes - `max_tx_size` integer, required — Maximum transaction size - `max_block_header_size` integer, required — Maximum block header size - `key_deposit` string, required — The amount of a key registration deposit in Lovelaces - `pool_deposit` string, required — The amount of a pool registration deposit in Lovelaces - `e_max` integer, required — Epoch bound on pool retirement - `n_opt` integer, required — Desired number of pools - `a0` number, required — Pool pledge influence - `rho` number, required — Monetary expansion - `tau` number, required — Treasury expansion - `decentralisation_param` number, required — Percentage of blocks produced by federated nodes - `extra_entropy` string, nullable, required — Seed for extra entropy - `protocol_major_ver` integer, required — Accepted protocol major version - `protocol_minor_ver` integer, required — Accepted protocol minor version - `min_utxo` string, required — Minimum UTXO value. Use `coins_per_utxo_size` for Alonzo and later eras - `min_pool_cost` string, required — Minimum stake cost forced on the pool - `nonce` string, required — Epoch number only used once - `cost_models` object, nullable, required — Cost models parameters for Plutus Core scripts - `cost_models_raw` object, nullable — Cost models parameters for Plutus Core scripts in raw list form - `price_mem` number, nullable, required — The per word cost of script memory usage - `price_step` number, nullable, required — The cost of script execution step usage - `max_tx_ex_mem` string, nullable, required — The maximum number of execution memory allowed to be used in a single transaction - `max_tx_ex_steps` string, nullable, required — The maximum number of execution steps allowed to be used in a single transaction - `max_block_ex_mem` string, nullable, required — The maximum number of execution memory allowed to be used in a single block - `max_block_ex_steps` string, nullable, required — The maximum number of execution steps allowed to be used in a single block - `max_val_size` string, nullable, required — The maximum Val size - `collateral_percent` integer, nullable, required — The percentage of the transactions fee which must be provided as collateral when including non-native scripts - `max_collateral_inputs` integer, nullable, required — The maximum number of collateral inputs allowed in a transaction - `coins_per_utxo_size` string, nullable, required — Cost per UTxO word for Alonzo. Cost per UTxO byte for Babbage and later. - `coins_per_utxo_word` string, nullable, required — Cost per UTxO word for Alonzo. Cost per UTxO byte for Babbage and later. - `pvt_motion_no_confidence` number, nullable, required — Pool Voting threshold for motion of no-confidence. - `pvt_committee_normal` number, nullable, required — Pool Voting threshold for new committee/threshold (normal state). - `pvt_committee_no_confidence` number, nullable, required — Pool Voting threshold for new committee/threshold (state of no-confidence). - `pvt_hard_fork_initiation` number, nullable, required — Pool Voting threshold for hard-fork initiation. - `dvt_motion_no_confidence` number, nullable, required — DRep Vote threshold for motion of no-confidence. - `dvt_committee_normal` number, nullable, required — DRep Vote threshold for new committee/threshold (normal state). - `dvt_committee_no_confidence` number, nullable, required — DRep Vote threshold for new committee/threshold (state of no-confidence). - `dvt_update_to_constitution` number, nullable, required — DRep Vote threshold for update to the Constitution. - `dvt_hard_fork_initiation` number, nullable, required — DRep Vote threshold for hard-fork initiation. - `dvt_p_p_network_group` number, nullable, required — DRep Vote threshold for protocol parameter changes, network group. - `dvt_p_p_economic_group` number, nullable, required — DRep Vote threshold for protocol parameter changes, economic group. - `dvt_p_p_technical_group` number, nullable, required — DRep Vote threshold for protocol parameter changes, technical group. - `dvt_p_p_gov_group` number, nullable, required — DRep Vote threshold for protocol parameter changes, governance group. - `dvt_treasury_withdrawal` number, nullable, required — DRep Vote threshold for treasury withdrawal. - `committee_min_size` string, nullable, required — Minimal constitutional committee size. - `committee_max_term_length` string, nullable, required — Constitutional committee term limits. - `gov_action_lifetime` string, nullable, required — Governance action expiration. - `gov_action_deposit` string, nullable, required — Governance action deposit. - `drep_deposit` string, nullable, required — DRep deposit amount. - `drep_activity` string, nullable, required — DRep activity period. - `pvtpp_security_group` number, nullable, required — Pool Voting threshold for security-relevant protocol parameters changes. Renamed to pvt_p_p_security_group. - `pvt_p_p_security_group` number, nullable, required — Pool Voting threshold for security-relevant protocol parameters changes. - `min_fee_ref_script_cost_per_byte` number, nullable, required ## Other responses - `400` — Bad request - `403` — Authentication secret is missing or invalid - `404` — Component not found - `418` — IP has been auto-banned for extensive sending of requests after usage limit has been reached - `429` — Usage limit reached - `500` — Internal Server Error --- [API](https://skmtc.net/txpipe/apis/blockfrost-io-api-documentation.md) · [All operations](https://skmtc.net/txpipe/apis/blockfrost-io-api-documentation/llms.txt) · [OpenAPI document](https://skmtc-service-staging.skmtc.workers.dev/v1/apis/txpipe/blockfrost-io-api-documentation/revisions/4a2f67b16876/schema)