穿过

Across 是最快、最便宜、最安全的跨链桥。它是一个使用 UMA 合约快速跨链移动代币的系统。这包含各种实用程序来支持跨应用程序。

如何使用

从在线 API 获取建议费用

跨官方 API 使用以获得建议的费用。

>>> import across
>>> a = across.AcrossAPI()
>>> a.suggested_fees("0x7f5c764cbc14f9669b88837ca1490cca17c31607", 10, 1000000000)
{'slowFeePct': '43038790000000000', 'instantFeePct': '5197246000000000'}

费用计算器

进行转账时计算 lp 费用百分比。

from across.fee_calculator import (
    calculate_apy_from_utilization,
    calculate_realized_lp_fee_pct,
)
from across.utils import toBNWei

rate_model = {
    "UBar": toBNWei("0.65"),
    "R0": toBNWei("0.00"),
    "R1": toBNWei("0.08"),
    "R2": toBNWei("1.00"),
}

interval = { "utilA": 0, "utilB": toBNWei(0.01), "apy": 615384615384600, "wpy": 11830749673498 }
apy_fee_pct = calculate_apy_from_utilization(rate_model, interval["utilA"], interval["utilB"])
assert apy_fee_pct == interval["apy"]

realized_lp_fee_pct = calculate_realized_lp_fee_pct(rate_model, interval["utilA"], interval["utilB"])
assert realized_lp_fee_pct == interval["wpy"]

LP费用计算器

按时间戳获取 lp 费用计算。

from across import LpFeeCalculator
from web3 import Web3

provider = Web3.WebsocketProvider("{YOUR-PROVIDER-ADDRESS}")
calculator = LpFeeCalculator(provider)
token_address = "0xC02aaA39b223FE8D0A0e5C4F27eAD9083C756Cc2" # WETH on mainnet
bridge_pool_address = "0x7355Efc63Ae731f584380a9838292c7046c1e433" # WETH BridgePool on mainnet
amount = "1000000000000000000" # 1 ETH
timestamp = 1645000000 # timestamp in seconds
percent = calculator.get_lp_fee_pct(
    token_address, bridge_pool_address, amount, timestamp
)
print(percent)

如何构建和测试

安装诗歌并安装依赖项：

pip3 install poetry

poetry install

# test
python -m unittest

# local install and test
pip3 install twine
python3 -m twine upload --repository testpypi dist/*
pip3 install --index-url https://test.pypi.org/simple/ --no-deps across