ERPC SDK for Python

Async Python client for ERPC. It covers standard Solana, Ethereum, and Avalanche C/P/X-chain JSON-RPC, indexed assets, history, leader and analytics RPC, WebSocket subscriptions, price REST and server-sent events, account usage, and scoped Cloud reads.

python -m pip install erpc-sdk

Python 3.11 or newer is required.

Quick start

import asyncio
import os

from erpc_sdk import ErpcClient, ErpcClientConfig


async def main() -> None:
    async with ErpcClient(ErpcClientConfig(os.environ["ERPC_API_KEY"])) as erpc:
        slot = await erpc.solana.rpc.get_slot().send()
        chain_id = await erpc.ethereum.rpc.eth_chain_id().send()
        avalanche_chain_id = await erpc.avalanche.rpc.eth_chain_id().send()
        print(slot, chain_id, avalanche_chain_id)


asyncio.run(main())

Both exact wire names (getSlot, eth_chainId) and Python snake-case aliases (get_slot, eth_chain_id) create inert requests. Network I/O starts only when send() is awaited. request() restricts calls to the namespace catalog; raw() is the forward-compatible escape hatch.

Namespaces

avalanche_endpoint defaults to https://ava-rpc.erpc.global and can be overridden independently. The SDK uses its /ava HTTP route and /ava-ws WebSocket route. Native methods use named mappings and Index calls use explicit chain/container paths. Native and Index batches are rejected locally; use raw() with an exact wire method name for forward compatibility.

p_height = await erpc.avalanche.p_chain.get_height().send()
indexed_tx = await erpc.avalanche.index.x_chain_transactions.get_container_by_id(
    {"id": transaction_id}
).send()

Intact batches

results = await erpc.solana.rpc.batch([
    {"method": "getSlot", "params": []},
    {"method": "getBlockHeight", "params": []},
]).send()

The SDK sends one caller batch as one server batch, restores caller order, accepts at most 256 calls, and rejects invalid mixed or unsupported batches locally. It never silently splits a batch.

Subscriptions

subscription = await erpc.ethereum.subscriptions.subscribe("newHeads")
async for header in subscription:
    print(header)
    await subscription.unsubscribe()
    break

Solana exposes account_subscribe, transaction_subscribe, and raw_subscribe. HTTP requests accept a RequestOptions(cancel_event=...); normal asyncio task cancellation is also preserved.

Cloud reads

from erpc_sdk import ErpcCloudClient, ErpcCloudClientConfig

async with ErpcCloudClient(ErpcCloudClientConfig(access_token)) as cloud:
    offerings = await cloud.catalog.list()
    resources = await cloud.resources.list()

Cloud configuration accepts HTTPS endpoints and localhost HTTP endpoints for testing. It retains only the access token supplied by the caller and does not implement interactive authorization or refresh-credential storage.

Safety boundaries

• Credentials are redacted from configuration representations, public endpoints, transport errors, and JSON-RPC error data.
• State-changing calls, including transaction submission, are never retried.
• REST, JSON-RPC, and caller batch boundaries remain explicit.
• Unknown methods remain available through raw() without being included in the typed compatibility catalog.