SOFR LIBOR Transition Basis Lookup

Reconcile actual SOFR/LIBOR observations with caller verified tenor-specific transition spread, no current rate feed, frozen universal adjustment or contract amendment. Caller independently verifies edition, jurisdiction, applicability and one currency; screening does not establish legal compliance, coverage or bank approval.

Description

A benchmark transition can combine a replacement rate with a contract-specific spread.

A benchmark transition can combine a replacement rate with a contract-specific spread.^[1]

A basis comparison does not select a fallback tenor or fetch current market rates. Use SOFR LIBOR Transition Basis Lookup to evaluate the supplied inputs under the model explained below.

When to use SOFR LIBOR Transition Basis Lookup

Use SOFR LIBOR Transition Basis Lookup to evaluate the supplied inputs under the model explained below. Establish the currency and minor-unit convention, measurement period and applicable transaction or institution context.

How to use SOFR LIBOR Transition Basis Lookup and understand its results

Establish the currency and minor-unit convention, measurement period and applicable transaction or institution context.
Enter Caller legacy tenor ids, Caller verified spread adjustment bps, Query legacy tenor id, Observed replacement sofr bps, Observed legacy libor bps using the field table and validation rules below, then run the tool.
Read Caller adjusted replacement bps, Signed legacy minus adjusted basis bps; interpret the units, signs, ordering and unknown-value placeholders described below.
Correct reported input errors and rerun. Apply successful results according to their specific meanings and check the assumptions before using them in a decision.

Input field	Meaning	Value type	Requirement
callerLegacyTenorIds	Caller legacy tenor ids	array of string	Required; constraints below
callerVerifiedSpreadAdjustmentBps	Caller verified spread adjustment bps	array of number	Required; constraints below
queryLegacyTenorId	Query legacy tenor id	string	Required; constraints below
observedReplacementSofrBps	Observed replacement sofr bps	number	Required; constraints below
observedLegacyLiborBps	Observed legacy libor bps	number	Required; constraints below

Enter nonempty unique legacy-tenor IDs, aligned signed safe-integer independently verified adjustments in basis points, an exact query tenor and signed safe-integer observed SOFR and LIBOR rates in basis points. Add the selected adjustment to SOFR and subtract the adjusted rate from LIBOR. Outputs must remain safe integers. No market rate, spread convention, compounding or contract fallback is selected.

adjustedReplacementBps=observedSofrBps+selectedAdjustmentBps; basisBps=observedLiborBps−adjustedReplacementBps

Use the field order, units and branch conditions described above.

Output field	Meaning	Value type
callerAdjustedReplacementBps	Caller adjusted replacement bps	number
signedLegacyMinusAdjustedBasisBps	Signed legacy minus adjusted basis bps	number

json

{
  "input": {
    "callerLegacyTenorIds": [
      "1m",
      "3m"
    ],
    "callerVerifiedSpreadAdjustmentBps": [
      10,
      20
    ],
    "queryLegacyTenorId": "3m",
    "observedReplacementSofrBps": 500,
    "observedLegacyLiborBps": 550
  },
  "output": {
    "callerAdjustedReplacementBps": 520,
    "signedLegacyMinusAdjustedBasisBps": 30
  }
}

Limitations and assumptions

A basis comparison does not select a fallback tenor or fetch current market rates. Apply the exact scope and assumptions explained above.

All listed fields require explicit values. Unexpected fields, incorrect types, nonfinite numbers and sparse arrays fail validation. Domain-specific bounds, alignments and supported tokens are explained above; extremely large inputs or outputs can also be rejected. Input errors differ from successful false results, empty match lists and unknown-evidence placeholders.

Alternative or Complementary methods

Use Stablecoin Reserve Attestation Monthly Report Reading Guide for a related task: A reserve report has a defined entity, date, assurance scope and liability basis.

Use Ria Versus Broker Dealer Fiduciary Suitability Standard Lookup for a related task: Investment-professional conduct standards depend on role, service and legal context.

References

SOFR LIBOR Transition Basis Lookup — tool.io

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