Get epoch protocol parameters
Retrieves protocol parameters for a specific epoch, or for the latest (current) epoch when epoch_no is omitted. Protocol parameters are immutable historical data that define network configuration. Includes fees, limits, staking parameters, and governance settings.
Authorizations
API key (programmatic access — recommended)
Send your API key in the X-Api-Key header. Keys start with nxs_ and are
created in the dashboard (or via POST /api/keys with a session JWT).
Each key is scoped to one chain and one network (for example
cardano-mainnet), fixed at creation time. It cannot query a different network
on the same chain, and it cannot query a different chain at all. A mismatched
network parameter returns 400 Network Mismatch. Create one key per chain
and network under the same account.
This is the credential most integrations should use.
Query Parameters
CARDANO_MAINNET, CARDANO_PREPROD, CARDANO_PREVIEW, APEX_PRIME_MAINNET, APEX_VECTOR_MAINNET, APEX_VECTOR_TESTNET, MIDNIGHT_MAINNET, MIDNIGHT_PREPROD, MIDNIGHT_PREVIEW, BITCOIN_MAINNET, BITCOIN_TESTNET4 Epoch number (0 for genesis epoch; omit for latest parameters)
Response
Successfully retrieved epoch protocol parameters