create_public_client

Create sync Web3 instance with public (read-only) Seismic access

Create a synchronous Web3 instance with public (read-only) Seismic access.

Overview

create_public_client() creates a client for read-only operations on the Seismic network. No private key is required. The w3.seismic namespace provides only public read operations: get_tee_public_key(), get_deposit_root(), get_deposit_count(), and contract() (with .tread only).

This is useful for applications that only need to query chain state without submitting transactions, such as block explorers, analytics dashboards, or read-only dApps.

Signature

def create_public_client(rpc_url: str) -> Web3

Parameters

Parameter	Type	Required	Description
rpc_url	str	Yes	HTTP(S) URL of the Seismic node (e.g., "https://gcp-1.seismictest.net/rpc"). WebSocket URLs are not supported — see note below

Returns

Type	Description
Web3	A Web3 instance with w3.seismic namespace attached (SeismicPublicNamespace)

Examples

Basic Usage

from seismic_web3 import create_public_client

# Create public client
w3 = create_public_client("https://gcp-1.seismictest.net/rpc")

# Query TEE public key
tee_pk = w3.seismic.get_tee_public_key()
print(f"TEE public key: {tee_pk.to_0x_hex()}")

# Query deposit info
root = w3.seismic.get_deposit_root()
count = w3.seismic.get_deposit_count()
print(f"Deposit root: {root.to_0x_hex()}, count: {count}")

Using Chain Configuration

from seismic_web3 import SEISMIC_TESTNET

# Recommended: use chain config instead of raw URL
w3 = SEISMIC_TESTNET.public_client()

# Equivalent to:
# w3 = create_public_client(SEISMIC_TESTNET.rpc_url)

Read-Only Contract Access

from seismic_web3 import create_public_client

w3 = create_public_client("https://gcp-1.seismictest.net/rpc")

# Create contract wrapper (read-only)
contract = w3.seismic.contract(
    address="0xf39Fd6e51aad88F6F4ce6aB8827279cffFb92266",
    abi=contract_abi,
)

# Only transparent reads are available
result = contract.tread.balanceOf("0x1234...")

# Shielded operations are NOT available
# contract.swrite.transfer(...)  # AttributeError: no swrite on public client
# contract.sread.getBalance(...)  # AttributeError: no sread on public client

Standard Web3 Operations

from seismic_web3 import create_public_client

w3 = create_public_client("https://gcp-1.seismictest.net/rpc")

# All standard web3.py read operations work
block = w3.eth.get_block("latest")
print(f"Latest block: {block['number']}")

balance = w3.eth.get_balance("0xf39Fd6e51aad88F6F4ce6aB8827279cffFb92266")
print(f"Balance: {w3.from_wei(balance, 'ether')} ETH")

chain_id = w3.eth.chain_id
print(f"Chain ID: {chain_id}")

Block Explorer Pattern

from seismic_web3 import create_public_client

def get_chain_stats(rpc_url: str):
    w3 = create_public_client(rpc_url)

    # Get latest block
    block = w3.eth.get_block("latest")

    # Get deposit info
    deposit_root = w3.seismic.get_deposit_root()
    deposit_count = w3.seismic.get_deposit_count()

    # Get TEE info
    tee_pk = w3.seismic.get_tee_public_key()

    return {
        "block_number": block["number"],
        "block_hash": block["hash"].to_0x_hex(),
        "deposit_root": deposit_root.to_0x_hex(),
        "deposit_count": deposit_count,
        "tee_public_key": tee_pk.to_0x_hex(),
    }

stats = get_chain_stats("https://gcp-1.seismictest.net/rpc")
print(stats)

How It Works

The function performs two steps:

1. Create Web3 instance

   w3 = Web3(Web3.HTTPProvider(rpc_url))

2. Attach public Seismic namespace

   w3.seismic = SeismicPublicNamespace(w3)

No TEE public key fetching or encryption setup is performed since the client cannot perform shielded operations.

Client Capabilities

Standard Web3 Methods (e.g. w3.eth, w3.net)

• get_block(), get_transaction(), get_balance()

• get_code(), call(), estimate_gas()

• All other standard read-only web3.py functionality

Public Seismic Methods (w3.seismic)

• get_tee_public_key() - Get TEE public key

• get_deposit_root() - Query deposit merkle root

• get_deposit_count() - Query deposit count

• contract() - Create contract wrappers (.tread only)

NOT Available

• send_shielded_transaction() - Requires private key

• debug_send_shielded_transaction() - Requires private key

• signed_call() - Requires private key and encryption

• deposit() - Requires private key

• Contract .swrite and .sread methods - Require private key

Public vs Wallet Client

Feature	Public Client	Wallet Client
Private key	Not required	Required
Shielded writes	No	Yes
Signed reads	No	Yes
Transparent reads	Yes	Yes
Deposits	No	Yes
TEE queries	Yes	Yes
Standard Web3	All read operations	All operations

Notes

• HTTP only — Sync clients use Web3 with HTTPProvider, which does not support WebSocket connections. This is a limitation of the underlying web3.py library (WebSocketProvider is async-only). If you need WebSocket support (persistent connections, subscriptions), use create_async_public_client() with ws=True

• No private key required or accepted

• No encryption setup performed

• No RPC calls during client creation (lightweight)

• Cannot perform any write operations or shielded reads

• Contract wrappers only expose .tread (transparent read)

• For write operations, use create_wallet_client()

• For async operations, use create_async_public_client()

Use Cases

• Block explorers and chain analytics

• Read-only dApps that display public data

• Monitoring and alerting systems

• Price oracles and data aggregators

• Public dashboards and visualizations

• Testing and validation tools

See Also

• create_async_public_client - Async variant with WebSocket support

• create_wallet_client - Full-featured client with private key

• SeismicPublicNamespace - The public w3.seismic namespace

• Chains Configuration - Pre-configured chain constants

• Contract Instances - Working with contract wrappers