# /eth/v1/config/spec

Retrieve specification configuration used on this node. The configuration should include:

* Constants for all hard forks known by the beacon node, for example the [phase 0](https://github.com/ethereum/consensus-specs/blob/v1.3.0/specs/phase0/beacon-chain.md#constants) and [altair](https://github.com/ethereum/consensus-specs/blob/v1.3.0/specs/altair/beacon-chain.md#constants) values
* Presets for all hard forks supplied to the beacon node, for example the [phase 0](https://github.com/ethereum/consensus-specs/blob/v1.3.0/presets/mainnet/phase0.yaml) and [altair](https://github.com/ethereum/consensus-specs/blob/v1.3.0/presets/mainnet/altair.yaml) values
* Configuration for the beacon node, for example the [mainnet](https://github.com/ethereum/consensus-specs/blob/v1.3.0/configs/mainnet.yaml) values

Values are returned with following format:

* any value starting with 0x in the spec is returned as a hex string
* numeric values are returned as a quoted integer

#### Parameters:

**None**

#### Example:

{% code overflow="wrap" %}

```json
// Request
curl -X GET -H 'Content-Type: application/json' 
https://ethereum-beacon.blockpi.network/rpc/v1/your-rpc-key/eth/v1/config/spec

// Result
{
    "data": {
        "CONFIG_NAME": "mainnet",
        "PRESET_BASE": "mainnet",
        "TERMINAL_TOTAL_DIFFICULTY": "58750000000000000000000",
        "TERMINAL_BLOCK_HASH": "0x0000000000000000000000000000000000000000000000000000000000000000",
        "TERMINAL_BLOCK_HASH_ACTIVATION_EPOCH": "18446744073709551615",
        "SAFE_SLOTS_TO_IMPORT_OPTIMISTICALLY": "128",
        "MIN_GENESIS_ACTIVE_VALIDATOR_COUNT": "16384",
        "MIN_GENESIS_TIME": "1606824000",
        "GENESIS_FORK_VERSION": "0x00000000",
        "GENESIS_DELAY": "604800",
        "ALTAIR_FORK_VERSION": "0x01000000",
        "ALTAIR_FORK_EPOCH": "74240",
        "BELLATRIX_FORK_VERSION": "0x02000000",
        "BELLATRIX_FORK_EPOCH": "144896",
        "CAPELLA_FORK_VERSION": "0x03000000",
        "CAPELLA_FORK_EPOCH": "194048",
        "DENEB_FORK_VERSION": "0x04000000",
        "DENEB_FORK_EPOCH": "269568",
        "SECONDS_PER_SLOT": "12",
        "SECONDS_PER_ETH1_BLOCK": "14",
        "MIN_VALIDATOR_WITHDRAWABILITY_DELAY": "256",
        "SHARD_COMMITTEE_PERIOD": "256",
        "ETH1_FOLLOW_DISTANCE": "2048",
        "SUBNETS_PER_NODE": "2",
        "INACTIVITY_SCORE_BIAS": "4",
        "INACTIVITY_SCORE_RECOVERY_RATE": "16",
        "EJECTION_BALANCE": "16000000000",
        "MIN_PER_EPOCH_CHURN_LIMIT": "4",
        "MAX_PER_EPOCH_ACTIVATION_CHURN_LIMIT": "8",
        "CHURN_LIMIT_QUOTIENT": "65536",
        "PROPOSER_SCORE_BOOST": "40",
        "DEPOSIT_CHAIN_ID": "1",
        "DEPOSIT_NETWORK_ID": "1",
        "DEPOSIT_CONTRACT_ADDRESS": "0x00000000219ab540356cbb839cbe05303d7705fa",
        "GOSSIP_MAX_SIZE": "10485760",
        "MAX_REQUEST_BLOCKS": "1024",
        "EPOCHS_PER_SUBNET_SUBSCRIPTION": "256",
        "MIN_EPOCHS_FOR_BLOCK_REQUESTS": "33024",
        "MAX_CHUNK_SIZE": "10485760",
        "TTFB_TIMEOUT": "5",
        "RESP_TIMEOUT": "10",
        "ATTESTATION_PROPAGATION_SLOT_RANGE": "32",
        "MAXIMUM_GOSSIP_CLOCK_DISPARITY_MILLIS": "500",
        "MESSAGE_DOMAIN_INVALID_SNAPPY": "0x00000000",
        "MESSAGE_DOMAIN_VALID_SNAPPY": "0x01000000",
        "ATTESTATION_SUBNET_EXTRA_BITS": "0",
        "ATTESTATION_SUBNET_PREFIX_BITS": "6",
        "ATTESTATION_SUBNET_SHUFFLING_PREFIX_BITS": "3",
        "MAX_REQUEST_BLOCKS_DENEB": "128",
        "MAX_REQUEST_BLOB_SIDECARS": "768",
        "MIN_EPOCHS_FOR_BLOB_SIDECARS_REQUESTS": "4096",
        "BLOB_SIDECAR_SUBNET_COUNT": "6",
        "MAX_COMMITTEES_PER_SLOT": "64",
        "TARGET_COMMITTEE_SIZE": "128",
        "MAX_VALIDATORS_PER_COMMITTEE": "2048",
        "SHUFFLE_ROUND_COUNT": "90",
        "HYSTERESIS_QUOTIENT": "4",
        "HYSTERESIS_DOWNWARD_MULTIPLIER": "1",
        "HYSTERESIS_UPWARD_MULTIPLIER": "5",
        "SAFE_SLOTS_TO_UPDATE_JUSTIFIED": "8",
        "MIN_DEPOSIT_AMOUNT": "1000000000",
        "MAX_EFFECTIVE_BALANCE": "32000000000",
        "EFFECTIVE_BALANCE_INCREMENT": "1000000000",
        "MIN_ATTESTATION_INCLUSION_DELAY": "1",
        "SLOTS_PER_EPOCH": "32",
        "MIN_SEED_LOOKAHEAD": "1",
        "MAX_SEED_LOOKAHEAD": "4",
        "EPOCHS_PER_ETH1_VOTING_PERIOD": "64",
        "SLOTS_PER_HISTORICAL_ROOT": "8192",
        "MIN_EPOCHS_TO_INACTIVITY_PENALTY": "4",
        "EPOCHS_PER_HISTORICAL_VECTOR": "65536",
        "EPOCHS_PER_SLASHINGS_VECTOR": "8192",
        "HISTORICAL_ROOTS_LIMIT": "16777216",
        "VALIDATOR_REGISTRY_LIMIT": "1099511627776",
        "BASE_REWARD_FACTOR": "64",
        "WHISTLEBLOWER_REWARD_QUOTIENT": "512",
        "PROPOSER_REWARD_QUOTIENT": "8",
        "INACTIVITY_PENALTY_QUOTIENT": "67108864",
        "MIN_SLASHING_PENALTY_QUOTIENT": "128",
        "PROPORTIONAL_SLASHING_MULTIPLIER": "1",
        "MAX_PROPOSER_SLASHINGS": "16",
        "MAX_ATTESTER_SLASHINGS": "2",
        "MAX_ATTESTATIONS": "128",
        "MAX_DEPOSITS": "16",
        "MAX_VOLUNTARY_EXITS": "16",
        "INACTIVITY_PENALTY_QUOTIENT_ALTAIR": "50331648",
        "MIN_SLASHING_PENALTY_QUOTIENT_ALTAIR": "64",
        "PROPORTIONAL_SLASHING_MULTIPLIER_ALTAIR": "2",
        "SYNC_COMMITTEE_SIZE": "512",
        "EPOCHS_PER_SYNC_COMMITTEE_PERIOD": "256",
        "MIN_SYNC_COMMITTEE_PARTICIPANTS": "1",
        "INACTIVITY_PENALTY_QUOTIENT_BELLATRIX": "16777216",
        "MIN_SLASHING_PENALTY_QUOTIENT_BELLATRIX": "32",
        "PROPORTIONAL_SLASHING_MULTIPLIER_BELLATRIX": "3",
        "MAX_BYTES_PER_TRANSACTION": "1073741824",
        "MAX_TRANSACTIONS_PER_PAYLOAD": "1048576",
        "BYTES_PER_LOGS_BLOOM": "256",
        "MAX_EXTRA_DATA_BYTES": "32",
        "MAX_BLS_TO_EXECUTION_CHANGES": "16",
        "MAX_WITHDRAWALS_PER_PAYLOAD": "16",
        "MAX_VALIDATORS_PER_WITHDRAWALS_SWEEP": "16384",
        "MAX_BLOBS_PER_BLOCK": "6",
        "MAX_BLOB_COMMITMENTS_PER_BLOCK": "4096",
        "FIELD_ELEMENTS_PER_BLOB": "4096",
        "DOMAIN_CONTRIBUTION_AND_PROOF": "0x09000000",
        "SYNC_COMMITTEE_SUBNET_COUNT": "4",
        "DOMAIN_SYNC_COMMITTEE_SELECTION_PROOF": "0x08000000",
        "DOMAIN_BEACON_PROPOSER": "0x00000000",
        "DOMAIN_RANDAO": "0x02000000",
        "DOMAIN_DEPOSIT": "0x03000000",
        "DOMAIN_VOLUNTARY_EXIT": "0x04000000",
        "BLS_WITHDRAWAL_PREFIX": "0x00",
        "DOMAIN_SELECTION_PROOF": "0x05000000",
        "TARGET_AGGREGATORS_PER_SYNC_SUBCOMMITTEE": "16",
        "DOMAIN_BEACON_ATTESTER": "0x01000000",
        "DOMAIN_SYNC_COMMITTEE": "0x07000000",
        "DOMAIN_APPLICATION_MASK": "0x00000001",
        "TARGET_AGGREGATORS_PER_COMMITTEE": "16",
        "DOMAIN_AGGREGATE_AND_PROOF": "0x06000000"
    }
}
```

{% endcode %}


---

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