Fintech

Financial logic that proves it ran correctly.

Regulatory audits need more than code reviews. They need execution proof. Traverse produces a trace artifact for every run, with preconditions verified before execution and postconditions checked after.

Trace artifacts Immutable versioning Contract validation Apache 2.0

1×

Write your financial rule once. Run it everywhere.

100%

Test coverage enforced by CI on every crate.

Unsafe code. #![forbid(unsafe_code)] in all crates.

The problem

Financial logic scattered across every system.

You have the same eligibility rule in four places. Each one drifts slightly. A regulator asks you to reconstruct last quarter's decision and you have to check which version was live.

✕

Pricing engines duplicated across web app, mobile, backend, and AI pipelines. They drift.
✕

Eligibility rules produce different results in different environments.
✕

No execution audit trail means no way to reconstruct a disputed transaction.
✕

Compliance teams cannot verify what ran in production without checking source code.

What Traverse gives you

Every execution is provable.

Contract-governed capabilities run from a single WASM binary. The runtime validates before execution and writes a trace after. You can reconstruct any decision from the trace alone.

✓

Trace artifacts

Structured record of every execution. Input values, output values, precondition results, timing, and placement target. Queryable after the fact.
✓

Contract-validated execution

Preconditions verified before every run. Postconditions checked after. Invalid inputs fail at contract level, not deep inside business logic.
✓

Identical behavior everywhere

Same WASM binary in browser, edge, and cloud produces the same result. No environment-specific drift.
✓

Immutable versioning

Contract versions are pinned. Behavior is reproducible. You can replay any past decision against the exact version that ran.

Use cases

What fintech teams build with Traverse.

Loan eligibility checking

Precondition contracts verify credit score range, loan amount bounds, and applicant status before the eligibility logic runs. Trace artifacts record every decision.

Rate and fee calculation

One WASM binary computes rates in the quote tool, the API, and the billing worker. All three get the same number from the same contract.

Compliance reporting

Trace artifacts are structured and queryable. Compliance reports pull from the trace store rather than reconstructing from logs.

Cross-environment rule enforcement

Mobile app, backend API, and AI agent all call the same capability. Contract versioning means they all run the same version of the rule.

Contract example

Eligibility check with preconditions.

The contract specifies valid input ranges as preconditions. The runtime rejects calls that violate them before executing the WASM binary. The trace records what was checked.

Preconditions are machine-readable, not just documentation
The runtime enforces them on every call, not just in tests
Postconditions verify the output shape after execution
Contract version is pinned in the trace artifact

loan-eligibility.toml

              [capability]

              id = "loan-eligibility"

              version = "3.0.0"

              [execution]

              binary_format = "wasm"

              preferred_targets = ["local", "edge"]

              [constraints]

              network_access = false

              filesystem_access = false

              [preconditions]

              credit_score = "must be between 300 and 850"

              loan_amount = "must be between 1000 and 500000"

              party_size = "must be 1 or 2"

              [inputs]

              credit_score = { type = "number", required = true }

              loan_amount = { type = "number", required = true }

              party_size = { type = "number", required = true }

              term_months = { type = "number", required = true }

              [outputs]

              eligible = { type = "boolean" }

              max_amount = { type = "number" }

              interest_rate = { type = "number" }

              reason_code = { type = "string" }

              [postconditions]

              eligible = "must be present"

              reason_code = "must be non-empty"

Start with the quickstart.

Your first governed capability is five minutes away. Read the docs to go further.

Quickstart → Docs →