All Guides
ChatGPT · Custom GPT Actions4 min read

How to Get UK Parcel Prices Inside ChatGPT

Stop switching between tabs every time you need to ship something. This guide shows you how to add live UK parcel quotes — from Evri, DPD, Royal Mail and more — directly into ChatGPT using a Custom GPT Action. Setup takes about two minutes and no API key is required.

⏱ Time savings estimate

If you ship parcels weekly, you currently spend an estimated 20–30 minutes per week visiting individual carrier websites, comparing prices manually, and copying details back into your workflow. After this setup, you simply ask ChatGPT — and it fetches and compares all prices in under a second. That's 15+ hours recovered every year.

What you'll be able to do

Once set up, you can ask your Custom GPT things like:

  • "How much to send a 2kg parcel from Manchester to London?"
  • "Find the cheapest way to ship a box of books from SW1A 2AA to EH2 2EQ"
  • "What's the next-day delivery price from Evri vs DPD for a 5kg parcel?"
  • "Find me an Evri drop-off locker near EC1A 1BB"

ChatGPT will call the AI Parcels API in real time, fetch live prices from every major UK carrier, and present them to you in a clean, readable format — all without you leaving the chat.

Step 1 — Create a Custom GPT

  1. Go to chat.openai.com and click Explore GPTs in the left sidebar.
  2. Click Create in the top-right corner.
  3. Give your GPT a name — something like "UK Parcel Assistant" works well.
  4. In the instructions box, paste a system prompt like: "You are a UK parcel shipping assistant. When the user asks about sending a parcel, use the AI Parcels API to fetch live quotes. Always present prices in pounds (£) and mention estimated delivery dates."

Step 2 — Add the AI Parcels Action

  1. In the GPT editor, click the Configure tab.
  2. Scroll to the bottom and click Create new action.
  3. Under Authentication, select None — no API key is needed for quote lookups.
  4. Under Schema, click Import from URL and paste the URL below.
  5. Click Import — ChatGPT will automatically parse all available endpoints.
  6. Click Save to publish your Custom GPT.

OpenAPI Schema URL

https://api.ai.parcels.dotnethelp.co.uk/doc.json

Step 3 — Ask for a quote

Open your new Custom GPT and try a prompt like this:

Example conversation

You

"I need to send a 2kg parcel (25×20×10cm) from SW1A 2AA to EH2 2EQ. What are my options?"

GPT

Here are the available shipping options for your parcel from London to Edinburgh:

  • 📦 Evri Parcel Shop — £3.49 · Est. delivery Wed 26 Feb
  • 📮 Royal Mail Tracked 48 — £4.79 · Est. delivery Thu 27 Feb
  • 🚚 DPD Next Day — £6.99 · Est. delivery Tue 25 Feb

Would you like me to help book one of these, or find a drop-off locker near you?

What can ChatGPT do with this skill?

  • Compare shipping quotes — live prices from 6+ UK carriers in one call
  • Find drop-off locations — nearby lockers and parcel shops by postcode
  • Check service requirements — know exactly what info a courier needs before booking
  • Create a checkout link — generate a payment URL to book the label immediately

Tips for better results

  • Set your default origin postcode in the system instructions so you don't repeat it every time.
  • Ask it to "sort by cheapest" or "sort by fastest" and it will reorder results for you.
  • For international shipments, mention the destination country — ChatGPT will include customs guidance automatically.

Ready to try it?

See live UK carrier prices right now — no setup needed.

Rate CalculatorDownload SKILL.md

Also in this series

Claude guide →Grok guide →OpenClaw guide →