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Open data API

6 datasets as JSON or CSV: the statement for every year, every promise card, actors, forecasts and how they scored, contracts and data editions. Free, with no key and no sign-up.

Start at /api/v1, which lists every endpoint with a working example. Add .csv to an address for a spreadsheet.

Try it

One year's statement, line by line (curl)

curl -s https://ledgergov.uk/api/v1/statement/2025-26

Every promise card as a spreadsheet

curl -s -o promises.csv https://ledgergov.uk/api/v1/promises.csv

Forecasts and their scores in Python (pandas)

import pandas as pd

forecasts = pd.read_csv("https://ledgergov.uk/api/v1/forecasts.csv")
print(forecasts.groupby("result").size())

Promise statuses in a web page (JavaScript)

const res = await fetch("https://ledgergov.uk/api/v1/promises");
const { data, licence } = await res.json();
for (const p of data.promises) console.log(p.status_label, p.text);
console.log(licence.attribution);

Endpoints

/api/v1/statementEvery year: income, spending, borrowing, debt and GDP, outturn or OBR forecast.JSON CSV
/api/v1/statement/{year}One year, line by line: every income and spending line, and borrowing.JSON CSV
/api/v1/promisesEvery promise card: the quote, cost range, status and full history.JSON CSV
/api/v1/promises/{id}One promise card.JSON
/api/v1/actorsPeople, parties and the government, with their cards counted by status.JSON CSV
/api/v1/forecastsEvery recorded forecast and, once the outturn is in, how it scored.JSON CSV
/api/v1/contractsPublic contracts linked to promise cards, with every change in value or dates.JSON CSV
/api/v1/vintagesEvery edition of every source the data holds, newest first.JSON CSV

Every number comes with its source

Each number carries its unit, quality label, source and edition. Here is 2025-26 borrowing as the API gives it:

From /api/v1/statement/2025-26

{
  "borrowing": {
    "value": 134.286,
    "unit": "gbp_bn",
    "quality": "sourced",
    "source_id": "ons_psf",
    "vintage": "PESA-2026 + PSF-2026-09",
    "method_note": "Total spending minus receipts (PSF-2026-09). Published borrowing for 2025-26: 134.3bn."
  }
}

value: The number, in its unit. Money is in £ billion (gbp_bn) unless the unit says otherwise.
unit: gbp_bn, pct_gdp (% of GDP), rate_pct, persons_m, persons_k (thousands), households_m.
quality: sourced: from an official release. approx: worked out from official figures, with the method. modelled: from a model, as a range. training: a working figure not yet checked.
source_id: Which source the number comes from; the response lists every cited source under sources, with its licence.
vintage: The edition the number comes from, for example EFO-2026-03 (the OBR's March 2026 forecast).
method_note: How a number that is not simply copied from a source was made.
low, central, high: A range. Forecasts and model results always have one; a single published number has low = central = high.

Licence and credit

Most figures are Crown copyright under the Open Government Licence v3.0; quotes from Parliament are under the Open Parliament Licence v3.0. Every response carries its licence, and each source lists its own terms.

Please credit the data like this:

Attribution

Contains public sector information licensed under the Open Government Licence v3.0. Compiled by Public Ledger (https://ledgergov.uk).

What else the licence block says

Every number names its source (sources[].licence gives each one's terms). Most are Crown copyright under the OGL; Bank of England and NATO figures follow their own terms.
Quotes from Parliament: contains Parliamentary information licensed under the Open Parliament Licence v3.0 (https://www.parliament.uk/site-information/copyright-parliament/open-parliament-licence/). Other quotes are short extracts reproduced for reporting; their rights stay with the speaker and publisher (see each card's quote_licence).
Notes, summaries and statuses written by Public Ledger are licensed under Creative Commons Attribution 4.0 (CC BY 4.0) (https://creativecommons.org/licenses/by/4.0/): reuse them freely, crediting Public Ledger with a link to the page they come from.
Official forecasts are the OBR's and the ONS's, labelled by maker; only records with maker "public_ledger" are ours.

Stable, cached, private

Field names stay the same within v1. New fields may be added; anything that would break your code comes as a new version, and this one keeps working.
The data changes when the site is updated, after the nightly data job finds a new official release. Responses can be cached for an hour.
Any website can call it from the browser (open CORS for GET).
It only serves what the site publishes. Nothing about readers is in it: no follows, no subscriptions, no submissions.
No key, no account, no tracking.