nanoql for Python

nanoql for Python: quantitative finance, stateless by design, through nanoql's C interface. Calendars, curves, instruments, pricing engines and models are each a plain function of their inputs, with market conventions as data, and the same inputs always give the same results.

pip install nanoql

One wheel per platform, for every Python from 3.11, with NumPy 1.26 or later and nothing compiled on install: Windows x64 and Linux x64 (manylinux_2_28, glibc 2.28 or later); Windows Arm64, Linux Arm64 and macOS on Apple silicon follow in later releases. The wheel holds nanoql's native library, so no .NET runtime is needed.

A first swap

A five-year SOFR swap on a flat curve:

import datetime
from nanoql import ConventionSet, DiscountingSwapEngine, EvaluationContext, FlatForward, MakeOIS, Period, TimeUnit

today = datetime.date(2026, 10, 15)
context = EvaluationContext(today)
qs = ConventionSet.quant_lib()
curve = FlatForward(today, 0.036, qs.day_counter("Actual365Fixed"))

swap = (MakeOIS(Period(5, TimeUnit.Years), qs.overnight_index("Sofr", curve))
        .with_fixed_rate(0.036).with_nominal(10e6)
        .to_overnight_indexed_swap(context))

result = DiscountingSwapEngine.calculate(swap, context, curve)
print(f"NPV {result.npv:,.2f}, fair rate {result.fair_rate:.4%}")

Names follow PEP 8 (curve.discount(5.0), swap.fixed_rate), a getter is a property, and an object's handle is released when Python collects it, or at once by close() or a with block. import nanoql.experimental opts in to the experimental API. The rules are in the bindings guide.

A notebook takes this swap further, to bootstrapped curves, €STR discounting and Euribor forecasting, a SABR smile, an American put and a CDS; it runs in Google Colab with nothing to install.

How it is checked

The core's results are checked against QuantLib 1.44, using test vectors generated by QuantLib's Python package and by QuantLib built from source; the extensions ported from QLNet are checked against QLNet 1.13.2. What the checks cover, per module, is on the validation page.

More

• Documentation.
• Source and issues, and the changelog.

License

Apache 2.0. nanoql is derived from QuantLib. The wheel carries LICENSE, NOTICE and THIRD_PARTY_NOTICES.md, which keep the copyright notices and licences of QuantLib and of the other code it carries, and the .NET runtime's LICENSE.TXT and THIRD-PARTY-NOTICES.TXT, which Native AOT compiles into the library.