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UK Office for National Statistics (website timeseries API)

Office for National Statistics (UK) · CPI/CPIH/RPI (MM23) monthly, ~mid-month (next 22 July 2026 at build time); quarterly national accounts (QNA) quarterly (released 30 June 2026, next 13 August 2026); GDP second quarterly estimate (PN2) quarterly; labour market (LMS) monthly (released 20 July 2026, next 18 August 2026); population estimates (pop) annual. ONS revises history routinely: the autumn Blue Book rewrites GDP levels and LFS reweighting rewrites labour-market history.

License: open-government · official terms. Attribution text and per-series license flags ride in every API envelope.

Source API docs · Verification statuses come from golden-value and freshness checks against the live source; see status.

Quickstart

Latest observations, with provenance and citation on every value:

curl "https://starwell.dev/api/starwell/v1/sources/ons-api/series/ABMI/observations?latest=12"

A computed, cited answer from this source:

curl -X POST "https://starwell.dev/api/starwell/v1/answer" \
  -H "Content-Type: application/json" \
  -d '{"question": "What is the latest Gross Domestic Product: chained volume measures: Seasonally ?", "source": "ons-api"}'

As MCP tools in Claude, Cursor, or any agent framework:

claude mcp add --transport http starwell https://starwell.dev/api/starwell/mcp

Series