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fetch.li
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Beginner FAQ

No code required to read this page. If a word is technical, we explain it on the spot.

What is fetch.li?

fetch.li is a UK API for weather, bank holidays, VAT, postcodes, and similar everyday jobs. The company behind it is Tidalux Ltd.

What is an API?

An API is a web address that answers a question with data instead of a full website.

You already use APIs without noticing: a weather app, a card payment, a maps pin. fetch.li is the same idea, except the answer is a short English sentence first (answer and say), then the numbers if you need them.

You do not install an app. You open a link, or paste it into a spreadsheet.

Why would I need this?

Because most “UK data” is split across five logins: weather, bank holidays, VAT, postcodes, carbon. You wanted “take a coat” and “posted Friday, three working days.” That is what we return.

Typical jobs:

  • A shop homepage that promotes raincoats when Kit: umbrella is on
  • A Slack morning line for the office postcode
  • Google Sheets that add VAT or convert euros without a plugin
  • A hotel email that says what to pack three days before arrival

How can this help my business?

Read kit, do, and vibe from Pulse or What to pack. Those flags are commercial triggers:

  • Bike shop: Kit: bike plus dry weather, then a lube discount
  • Fashion: raining, then rainwear first
  • Energy / IoT: low gCO₂/kWh, then run the washer or charger
  • Hospitality: planets in sight, then a stargazing note to guests

You still write the email. We tell you what is true outside so the email is not generic.

Do I need to be a developer?

No. Try a link in the browser. Or see Install for the average-person path (bookmark, Sheets, Zapier) and the developer path (curl, fetch, Python).

Is it free?

GET calls are free on the demo: 60 per hour from your network, no key. That is enough to learn and to prototype. Vibe classify (tone of voice) needs a paid key. Higher volume: pricing.

Is this accurate enough to file a tax return?

No. Tax, NI, and stamp duty are indicative tables for 2026/27 so software can show a number. Confirm on GOV.UK before you file. FX is ECB reference rates, not a tradable quote.

What is Pulse?

One GET that bundles weather, kit, air, carbon, and what is in the sky. Example: https://fetch.li/v1/pulse?postcode=SW1A1AA&format=text

That is the “coat” idea at product scale.

Where do I start?

  1. Install if you have never called an API.
  2. Getting started if you want Try buttons and keys.
  3. Spreadsheets and no-code if you already know the job.
Getting startedUse Try buttons without an account, then get an API key when you need vibe classification or higher limits. InstallationHow to use fetch.li with no install, in a spreadsheet, or from code. Average-person path and developer path. Spreadsheets and no-codeFirst fetch.li call, then Google Sheets, Zapier, Make, and the jobs the API is actually good at. Answer contractEvery success body leads with ok, answer, and say. format=text, md, svg, csv. Demo tierWhat you get for free on GET endpoints, the 60 calls per hour limit, and what requires a paid key. pricing