Base

Explore the data available on Base Chain, inspect its block model, then move into Substreams packages you can consume.

Find usable data Inspect schema Full block model

Packages to consume

Packages on Base

Events

Contract event streams

Decode logs into protocol-level datasets without polling RPC endpoints.

Token data

Token movement packages

Transfers, balances, and holder changes for the chain native ecosystem.

DeFi

DEX analytics packages

Reusable modules for swaps, liquidity, and pool state changes.

Infrastructure

Endpoints and services

Registry-defined endpoints show where this chain exposes streaming access.

Base Chain

mainnet , eip155:8453

Streaming endpoints

base.substreams.pinax.network:443

base-mainnet.streamingfast.io:443

Base Sepolia Testnet

testnet , eip155:84532

Streaming endpoints

basesepolia.substreams.pinax.network:443

Block model

Protobuf summary

Short schema sections expose the source input types packages use when consuming Base data.

View Buf schema Full block model

Messages

Block TransactionTrace Call Log

sf.ethereum.type.v2.Block

Block

Top-level EVM block object emitted by Firehose and consumed by Substreams source inputs.

Open full descriptor

No.FieldType

hash

bytes

Block hash.

bytes

number

uint64

Canonical block height.

uint64

header

BlockHeader

Header information including parent hash, roots, gas data, and timestamp.

BlockHeader

transaction_traces

repeated TransactionTrace

Executed transaction traces, logs, calls, and receipt-level data.

repeated TransactionTraceType reference

balance_changes

repeated BalanceChange

Native token balance movements computed from execution.

repeated BalanceChangeType reference

sf.ethereum.type.v2.TransactionTrace

TransactionTrace

Transaction execution container used by DEX, token, NFT, and protocol analytics packages.

Open full descriptor

No.FieldType

value

BigInt

Ether value transferred by the transaction.

BigInt

hash

bytes

Transaction hash.

bytes

from

bytes

Sender address.

bytes

receipt

TransactionReceipt

Receipt with status, gas, and log output.

TransactionReceiptType reference

calls

repeated Call

Nested EVM call tree.

repeated CallType reference

sf.ethereum.type.v2.Call

Call

Internal EVM call tree node with logs, storage changes, balance changes, and execution ordinals.

Open full descriptor

No.FieldType

index

uint32

Call index in the transaction trace.

uint32

parent_index

uint32

Parent call index used to reconstruct the call tree.

uint32

caller

bytes

Caller address.

bytes

address

bytes

Callee address.

bytes

logs

repeated Log

Logs emitted by this call.

repeated LogType reference

state_reverted

bool

Whether this call was reverted by chain execution.

bool

sf.ethereum.type.v2.Log

Log

Contract event payload most packages use to derive protocol-level datasets.

Open full descriptor

No.FieldType

address

bytes

Contract address that emitted the event.

bytes

topics

repeated bytes

Indexed event topics.

repeated bytes

data

bytes

ABI-encoded non-indexed event data.

bytes

index

uint32

Index of the log relative to the transaction.

uint32

block_index

uint32

Index of the log relative to the block.

uint32

ordinal

uint64

Global execution ordinal inside the block.

uint64

Grouped networks

Mainnet and testnets together

Testnets stay under the parent chain to reduce noise while keeping endpoint details one click away.

Base Chain

base

mainnet

2 streaming endpointsFirst block genesis

Base Sepolia Testnet

base-sepolia

testnet

1 streaming endpointsFirst block genesis

Substreams x The Graph Market

Chain discovery to Market provisioning

Start with chain endpoints and package candidates, then use The Graph Market for the production path.

Explore on The Graph Market