Latest epoch protocol parameters

GET /epochs/latest/parameters

Return the protocol parameters for the latest epoch.

Request

Responses

• 200
• 400
• 403
• 404
• 418
• 429
• 500

---

Return the data about the epoch

application/json

Schema

Example (from schema)

---

Schema

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

min_pool_cost string required

Minimum stake cost forced on the pool

nonce string required

Epoch number only used once

cost_models objectnullablerequired

Cost models parameters for Plutus Core scripts

property name* any nullable

Cost models parameters for Plutus Core scripts

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 deprecated

Cost per UTxO word for Alonzo. Cost per UTxO byte for Babbage and later.

{
  "epoch": 225,
  "min_fee_a": 44,
  "min_fee_b": 155381,
  "max_block_size": 65536,
  "max_tx_size": 16384,
  "max_block_header_size": 1100,
  "key_deposit": "2000000",
  "pool_deposit": "500000000",
  "e_max": 18,
  "n_opt": 150,
  "a0": 0.3,
  "rho": 0.003,
  "tau": 0.2,
  "decentralisation_param": 0.5,
  "extra_entropy": null,
  "protocol_major_ver": 2,
  "protocol_minor_ver": 0,
  "min_utxo": "1000000",
  "min_pool_cost": "340000000",
  "nonce": "1a3be38bcbb7911969283716ad7aa550250226b76a61fc51cc9a9a35d9276d81",
  "cost_models": {
    "PlutusV1": {
      "addInteger-cpu-arguments-intercept": 197209,
      "addInteger-cpu-arguments-slope": 0
    },
    "PlutusV2": {
      "addInteger-cpu-arguments-intercept": 197209,
      "addInteger-cpu-arguments-slope": 0
    }
  },
  "price_mem": 0.0577,
  "price_step": 0.0000721,
  "max_tx_ex_mem": "10000000",
  "max_tx_ex_steps": "10000000000",
  "max_block_ex_mem": "50000000",
  "max_block_ex_steps": "40000000000",
  "max_val_size": "5000",
  "collateral_percent": 150,
  "max_collateral_inputs": 3,
  "coins_per_utxo_size": "34482"
}

Bad request

application/json

Schema

Example (from schema)

---

Schema

status_code integer required
error string required
message string required

{
  "status_code": 400,
  "error": "Bad Request",
  "message": "Backend did not understand your request."
}

Authentication secret is missing or invalid

application/json

Schema

Example (from schema)

---

Schema

status_code integer required
error string required
message string required

{
  "status_code": 403,
  "error": "Forbidden",
  "message": "Invalid project token."
}

Component not found

application/json

Schema

Example (from schema)

---

Schema

status_code integer required
error string required
message string required

{
  "status_code": 404,
  "error": "Not Found",
  "message": "The requested component has not been found."
}

IP has been auto-banned for extensive sending of requests after usage limit has been reached

application/json

Schema

Example (from schema)

---

Schema

status_code integer required
error string required
message string required

{
  "status_code": 418,
  "error": "Requested Banned",
  "message": "IP has been auto-banned for flooding."
}

Usage limit reached

application/json

Schema

Example (from schema)

---

Schema

status_code integer required
error string required
message string required

{
  "status_code": 429,
  "error": "Project Over Limit",
  "message": "Usage is over limit."
}

Internal Server Error

application/json

Schema

Example (from schema)

---

Schema

status_code integer required
error string required
message string required

{
  "status_code": 500,
  "error": "Internal Server Error",
  "message": "An unexpected response was received from the backend."
}

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