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Independent adversarial testing for fraud detection

Stress-test fraud models before fraudsters do.

Simukon generates stateful financial behavior, mutates fraud scenarios, and probes the models and rules you already run—helping teams find blind spots before deployment and model changes.

Run the Demo See How It Works
Vendor-neutral testing · Stateful synthetic scenarios · Reproducible runs
run/8f21a — Card Fraud Model v3.2 × Account Takeover × 10,000 variants RUNNING elapsed 0.0s
Test matrix 0 / 10,000 variants
Detected Bypass found Provisioning environment…
Tested
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Detected
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Bypasses
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Provisioning environment… 0%
env sk-inst-01 · shadow mode · mutation round 1/6
01 The testing gap

Historical validation cannot test what never appeared in history.

Historical validation is constrained by known attack patterns and available labels. Rare, novel, and fast-changing behaviors leave gaps that are difficult to measure with historical data alone. Simukon creates a controlled environment for exploring those gaps.

How the testing gap emerges
exposure window RELEASE n TODAY
Conceptual illustration: model knowledge updates in releases while attacker behavior changes continuously.
Rare failures are underrepresented

The highest-impact failure patterns may have the fewest historical examples.

Labels arrive after exposure

A new attack pattern can affect customers before enough confirmed cases exist for retraining and validation.

Detection has a customer-cost trade-off

Increasing sensitivity can also increase legitimate declines, reviews, and customer friction. Both outcomes need to be measured.

02 How Simukon works

An adversarial test loop for the fraud stack you already run.

Simukon adds an independent simulation and testing layer around existing models and rules. It generates financial behavior, searches for bypass patterns, and converts discovered failures into repeatable regression tests.

Stage

Produces
Labelled event stream
Scale
Defined by the test configuration
Result
Versioned, reproducible scenario suite
03 Simulation

From one fraud scenario to thousands of adversarial variants.

Choose a scenario. Simukon varies behavioral and transactional conditions, measures the model's response, and searches for combinations it consistently approves.

Illustrative demo run — results generated against a demo model
Attacks tested
0
Detected
0
Bypasses
0
Fraud recall
0.0%
Legitimate events challenged
0.0%
Attack detection is measured on synthetic attack variants. Customer-friction metrics are measured separately on synthetic legitimate behavior.
Detection by attack family
Vulnerability clusters plotting bypasses…
Transaction value →↑ Similarity to legitimate
04 Model comparison

Benchmark every model against the same adversary.

Run identical scenario versions, seeds, thresholds, and evaluation windows across vendor models, in-house rules, and candidate systems. Compare their strengths and trade-offs using repeatable evidence.

Replace inconsistent vendor comparisons with one controlled test suite.
Model under test
Attack detection
Scenario coverage
Legitimate events challenged
Critical failure clusters
Suite version · Scenario version · Seed · Sample size · Evaluation window · Threshold policy
05 Technology

Stateful synthetic environments, not sampled datasets.

Simukon models financial entities and relationships that persist over time. Accounts develop histories. Devices move between users. Merchants, beneficiaries, sessions, and payment behavior remain connected. This makes it possible to test sequences and attack paths that isolated rows cannot represent.

06 Platform direction

The testing layer for high-stakes financial decision systems.

FraudInitial focus AML and identityAdjacent domains Credit riskFuture domain Financial model assuranceLong-term platform

Fraud is Simukon's first proving ground: behavior changes quickly, failures are costly, and outcomes are measurable. The same core infrastructure could extend to other financial-risk domains as those products are developed.

From fraud-model stress testing to simulation and assurance infrastructure for financial risk.

Private beta · accepting design partners

Find what your fraud model misses.

We are working with a small number of fraud and risk teams to run scoped simulations against their existing models. If that is relevant to your team, tell us a little about your setup.

01Tell us which model or ruleset you want tested.
02We scope a simulation with you and agree what success looks like.
03You get a ranked weakness report and a regression suite you keep.
Read the technical brief

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