Rates and Financing

Rates datasets cover sterling reference rates, fitted curve structures, indicative swap equivalents, quoted mortgage benchmarks and hypothetical financing paths. They update independently of property-market data and do not accept geographic or property selectors.

Use GET /v1/rates/series. All requests need dataset; some also require a mortgage product or scenario. Optional dates refer to observation/snapshot dates, never the future maturity date.

Complete Dataset Index

Product	Dataset	Output shape	Date format	Additional required selector
Bank Rate	`bank_rate`	Scalar time series	`YYYY-MM-DD`	None.
SONIA Overnight Rate	`sonia_overnight`	Scalar time series	`YYYY-MM-DD`	None.
SONIA Compounded Index	`sonia_compounded_index`	Scalar index series	`YYYY-MM-DD`	None.
Sterling OIS Spot Curve	`ois_spot_curve`	Curve nodes	`YYYY-MM-DD`	None.
Sterling OIS Instantaneous Forward Curve	`ois_forward_curve`	Curve nodes	`YYYY-MM-DD`	None.
Indicative Sterling Swap Rates	`indicative_swap_rates`	Term nodes	`YYYY-MM-DD`	None.
Indicative Forward-Starting Swap Rates	`forward_starting_swap_rates`	Term/start surface	`YYYY-MM-DD`	None.
Nominal Gilt Spot Curve	`nominal_gilt_spot_curve`	Curve nodes	`YYYY-MM-DD`	None.
Nominal Gilt Instantaneous Forward Curve	`nominal_gilt_forward_curve`	Curve nodes	`YYYY-MM-DD`	None.
Real Gilt Spot Curve	`real_gilt_spot_curve`	Curve nodes	`YYYY-MM-DD`	None.
Real Gilt Instantaneous Forward Curve	`real_gilt_forward_curve`	Curve nodes	`YYYY-MM-DD`	None.
Market-Implied Inflation	`market_implied_inflation`	Curve nodes	`YYYY-MM-DD`	None.
Market-Implied Inflation Forward Curve	`market_implied_inflation_forward`	Curve nodes	`YYYY-MM-DD`	None.
Quoted Mortgage Rate Benchmarks	`mortgage_benchmarks`	Scalar by product	`YYYY-MM`	`mortgage_product`.
Mortgage-to-Swap Rate Spread	`mortgage_swap_spread`	Scalar by fixed product	`YYYY-MM`	`mortgage_product`.
Mortgage Reversion Spread to Bank Rate	`mortgage_reversion_spread`	Scalar spread	`YYYY-MM`	None.
Mortgage-to-Swap Spread History and Averages	`mortgage_spread_summary`	Latest saved summary	`YYYY-MM`	`mortgage_product`.
SONIA Forward Rate Path	`sonia_forward_path`	Future intervals	`YYYY-MM-DD`	None.
Bank Rate Scenarios	`bank_rate_scenarios`	Scenario path	`YYYY-MM-DD`	None.
Buy-to-Let Refinancing Rate Scenarios	`btl_refinancing_scenarios`	Scenario/term path	`YYYY-MM-DD`	None.
Mortgage Reversion Rate Scenarios	`mortgage_reversion_scenarios`	Scenario path	`YYYY-MM-DD`	None.
Financing Stress Scenarios	`financing_stress_scenarios`	Multi-metric scenario path	`YYYY-MM-DD`	`scenario`.

Choose the Right Reference

Use Reference Rates for historical Bank Rate, overnight SONIA and the compounded index. Use Curves and Swaps for maturity structures and indicative fixed-rate references. Use Mortgage Products for published benchmark products and spreads. Use Financing Scenarios for future assumptions.

A spot zero-coupon curve, an instantaneous forward curve, a fixed-term swap equivalent and a future one-month SONIA path are not interchangeable, even if all use percentages.

Recency and History

Daily acquisition does not make every source daily. Mortgage observations remain monthly; spread summaries update with supported monthly inputs. Scenarios can change with daily curves while retaining older, explicitly dated mortgage inputs.

Historical coverage varies substantially. Long Bank Rate or OIS history does not imply equivalent real-gilt, implied-inflation or scenario history. Use /coverage for the retained release. mortgage_spread_summary is a saved latest summary, not a prebuilt rolling summary at every past month. The forward path and financing scenario datasets expose saved scenario snapshots, not hindsight-reconstructed scenarios for arbitrary historical dates.

Units and Interpretation

rate_pct is in percentage units. Spreads use basis points, with 100bp equal to one percentage point. The compounded index uses index units. Keep the returned compounding, day-count and interval metadata where applicable.

Negative historical rates, real yields, inflation compensation or mortgage spreads are not automatically invalid. They should not be clipped simply to make a chart look positive.

These products support analysis. They are not executable trading quotes, personalised mortgage offers, APR calculations or a substitute for contractual financing terms. Scenarios have no assigned likelihood. Observed CPI, CPIH and RPI inflation series are not included in this product set.