defistream 1.0.4

Python client for the DeFiStream API

DeFiStream Python Client

Official Python client for the DeFiStream API.

Getting an API Key

To use the DeFiStream API, you need to sign up for an account at defistream.dev to obtain your API key.

Installation

pip install defistream

This includes pandas and pyarrow by default for DataFrame support.

With polars support (in addition to pandas):

pip install defistream[polars]

Quick Start

from defistream import DeFiStream

# Initialize client (reads DEFISTREAM_API_KEY from environment if not provided)
client = DeFiStream()

# Or with explicit API key
client = DeFiStream(api_key="dsk_your_api_key")

# Query ERC20 transfers using builder pattern
df = (
    client.erc20.transfers("USDT")
    .network("ETH")
    .block_range(21000000, 21010000)
    .as_df()
)

print(df.head())

Features

• Builder pattern: Fluent query API with chainable methods
• Type-safe: Full type hints and Pydantic models
• Multiple formats: DataFrame (pandas/polars), CSV, Parquet, JSON
• Async support: Native async/await with AsyncDeFiStream
• All protocols: ERC20, AAVE, Uniswap, Lido, Stader, Threshold, Native tokens

Supported Protocols

Protocol	Events
ERC20	transfers
Native Token	transfers
AAVE V3	deposits, withdrawals, borrows, repays, flashloans, liquidations
Uniswap V3	swaps, deposits, withdrawals, collects
Lido	deposits, withdrawal_requests, withdrawals_claimed, l2_deposits, l2_withdrawal_requests
Stader	deposits, withdrawal_requests, withdrawals
Threshold	deposit_requests, deposits, withdrawal_requests, withdrawals

Usage Examples

Builder Pattern

The client uses a fluent builder pattern. The query is only executed when you call a terminal method like as_df(), as_file(), or as_dict().

from defistream import DeFiStream

client = DeFiStream()

# Build query step by step
query = client.erc20.transfers("USDT")
query = query.network("ETH")
query = query.block_range(21000000, 21010000)
query = query.min_amount(1000)

# Execute and get DataFrame
df = query.as_df()

# Or chain everything
df = (
    client.erc20.transfers("USDT")
    .network("ETH")
    .block_range(21000000, 21010000)
    .min_amount(1000)
    .as_df()
)

ERC20 Transfers

# Get USDT transfers over 10,000 USDT
df = (
    client.erc20.transfers("USDT")
    .network("ETH")
    .block_range(21000000, 21010000)
    .min_amount(10000)
    .as_df()
)

# Filter by sender
df = (
    client.erc20.transfers("USDT")
    .network("ETH")
    .block_range(21000000, 21010000)
    .sender("0x28c6c06298d514db089934071355e5743bf21d60")
    .as_df()
)

AAVE Events

# Get deposits
df = (
    client.aave.deposits()
    .network("ETH")
    .block_range(21000000, 21010000)
    .as_df()
)

# Use a specific market type on ETH (Core, Prime, or EtherFi)
df = (
    client.aave.deposits()
    .network("ETH")
    .block_range(21000000, 21010000)
    .eth_market_type("Prime")
    .as_df()
)

Uniswap Swaps

# Get swaps for WETH/USDC pool with 0.05% fee tier
df = (
    client.uniswap.swaps("WETH", "USDC", 500)
    .network("ETH")
    .block_range(21000000, 21010000)
    .as_df()
)

# Or build with chain methods
df = (
    client.uniswap.swaps()
    .symbol0("WETH")
    .symbol1("USDC")
    .fee(500)
    .network("ETH")
    .block_range(21000000, 21010000)
    .as_df()
)

Native Token Transfers

# Get ETH transfers >= 1 ETH
df = (
    client.native_token.transfers()
    .network("ETH")
    .block_range(21000000, 21010000)
    .min_amount(1.0)
    .as_df()
)

Verbose Mode

By default, responses omit metadata fields to reduce payload size. Use .verbose() to include all fields:

# Default: compact response (no tx_hash, tx_id, log_index, network, name)
df = (
    client.erc20.transfers("USDT")
    .network("ETH")
    .block_range(21000000, 21010000)
    .as_df()
)

# Verbose: includes all metadata fields
df = (
    client.erc20.transfers("USDT")
    .network("ETH")
    .block_range(21000000, 21010000)
    .verbose()
    .as_df()
)

Return as DataFrame

# As pandas DataFrame (default)
df = (
    client.erc20.transfers("USDT")
    .network("ETH")
    .block_range(21000000, 21010000)
    .as_df()
)

# As polars DataFrame
df = (
    client.erc20.transfers("USDT")
    .network("ETH")
    .block_range(21000000, 21010000)
    .as_df("polars")
)

Save to File

Format is automatically determined by file extension:

# Save as Parquet (recommended for large datasets)
(
    client.erc20.transfers("USDT")
    .network("ETH")
    .block_range(21000000, 21100000)
    .as_file("transfers.parquet")
)

# Save as CSV
(
    client.erc20.transfers("USDT")
    .network("ETH")
    .block_range(21000000, 21100000)
    .as_file("transfers.csv")
)

# Save as JSON
(
    client.erc20.transfers("USDT")
    .network("ETH")
    .block_range(21000000, 21010000)
    .as_file("transfers.json")
)

Return as Dictionary (JSON)

For small queries, you can get results as a list of dictionaries:

transfers = (
    client.erc20.transfers("USDT")
    .network("ETH")
    .block_range(21000000, 21010000)
    .as_dict()
)

for transfer in transfers:
    print(f"{transfer['sender']} -> {transfer['receiver']}: {transfer['amount']}")

Note: as_dict() and as_file("*.json") use JSON format which has a 10,000 block limit. For larger block ranges, use as_df() or as_file() with .parquet or .csv extensions, which support up to 1,000,000 blocks.

Async Usage

import asyncio
from defistream import AsyncDeFiStream

async def main():
    async with AsyncDeFiStream() as client:
        df = await (
            client.erc20.transfers("USDT")
            .network("ETH")
            .block_range(21000000, 21010000)
            .as_df()
        )
        print(f"Found {len(df)} transfers")

asyncio.run(main())

Configuration

Environment Variables

export DEFISTREAM_API_KEY=dsk_your_api_key
export DEFISTREAM_BASE_URL=https://api.defistream.dev/v1  # optional

from defistream import DeFiStream

# API key from environment
client = DeFiStream()

# Or explicit
client = DeFiStream(api_key="dsk_...", base_url="https://api.defistream.dev/v1")

Timeout and Retries

client = DeFiStream(
    api_key="dsk_...",
    timeout=60.0,  # seconds
    max_retries=3
)

Error Handling

from defistream import DeFiStream
from defistream.exceptions import (
    DeFiStreamError,
    AuthenticationError,
    QuotaExceededError,
    RateLimitError,
    ValidationError
)

client = DeFiStream()

try:
    df = (
        client.erc20.transfers("USDT")
        .network("ETH")
        .block_range(21000000, 21010000)
        .as_df()
    )
except AuthenticationError:
    print("Invalid API key")
except QuotaExceededError as e:
    print(f"Quota exceeded. Remaining: {e.remaining}")
except RateLimitError as e:
    print(f"Rate limited. Retry after: {e.retry_after}s")
except ValidationError as e:
    print(f"Invalid request: {e.message}")
except DeFiStreamError as e:
    print(f"API error: {e}")

Response Headers

Access rate limit and quota information:

df = (
    client.erc20.transfers("USDT")
    .network("ETH")
    .block_range(21000000, 21010000)
    .as_df()
)

# Access response metadata
print(f"Rate limit: {client.last_response.rate_limit}")
print(f"Remaining quota: {client.last_response.quota_remaining}")
print(f"Request cost: {client.last_response.request_cost}")

Builder Methods Reference

Common Methods (all protocols)

Method	Description
.network(net)	Set network (ETH, ARB, BASE, OP, POLYGON, etc.)
.start_block(n)	Set starting block number
.end_block(n)	Set ending block number
.block_range(start, end)	Set both start and end blocks
.start_time(ts)	Set starting time (ISO format or Unix timestamp)
.end_time(ts)	Set ending time (ISO format or Unix timestamp)
.time_range(start, end)	Set both start and end times
.verbose()	Include all metadata fields

Protocol-Specific Parameters

Method	Protocols	Description
.token(symbol)	ERC20	Token symbol (USDT, USDC) or contract address (required)
.sender(addr)	ERC20, Native	Filter by sender address
.receiver(addr)	ERC20, Native	Filter by receiver address
.min_amount(amt)	ERC20, Native	Minimum transfer amount
.max_amount(amt)	ERC20, Native	Maximum transfer amount
.eth_market_type(type)	AAVE	Market type for ETH: 'Core', 'Prime', 'EtherFi'
.symbol0(sym)	Uniswap	First token symbol (required)
.symbol1(sym)	Uniswap	Second token symbol (required)
.fee(tier)	Uniswap	Fee tier: 100, 500, 3000, 10000 (required)

Terminal Methods

Method	Description
.as_df()	Execute and return pandas DataFrame
.as_df("polars")	Execute and return polars DataFrame
.as_file(path)	Execute and save to file (format from extension)
.as_file(path, format="csv")	Execute and save with explicit format
.as_dict()	Execute and return list of dicts (JSON, 10K block limit)

License

MIT License