Look up without a client
A support agent can paste an address and read the place and format without opening a code editor. Developers still get the JSON API for checkout and internal tools.
COMPARE · POSTCODEDOG VS ZIPCODEBASE
PostcodeDog vs Zipcodebase
A lookup product with the API included.
Zipcodebase is a global ZIP-code API with a free plan and paid volume. PostcodeDog puts the same kind of lookup in a browser, a batch page, an API and an MCP server — with no account or API key for the basic lookup.
SIDE BY SIDE
What changes with PostcodeDog
| Capability | UsPostcodeDog | Zipcodebase | Why it matters |
|---|---|---|---|
| Form | Lookup page, batch page, API and MCP | API only | Support and operations can use it without a client. |
| Access | Free, no account, no API key | Free plan with 5,000 requests, then paid | A quick check stays free. |
| Input | Paste an address, city or code; format detected | Country and postal-code endpoints | Use the customer’s text as-is. |
| Batch | Paste up to 50 rows, review, export CSV | One request per row | Operations can clear a queue without a script. |
| AI agents | Built-in MCP server at /mcp | — | Connect the lookup to Claude, Cursor or an internal agent. |
WHERE POSTCODEDOG WINS
The answer is part of the product.
No key for the basic lookup
The browser lookup, batch page and basic API do not need an account or key, so the first answer is immediate.
Agents connect directly
The MCP server exposes lookup, search, validation and address parsing to AI clients, with no extra glue.
TRY IT
Try the difference
Paste a full address, a city or a post code. Country and format are detected.
Free. No account, no API key.THE LOOP
Paste → resolve → verify
The same three steps work whether the address is a US ZIP, a UK outcode or a Japanese 〒.
- 01
Paste what you have
A full address, a city, or just a code. The parser accepts the whole line.
- 02
Confirm the place and format
Country, region and post code format are shown together, with nearby codes for a second option.
- 03
Send it to the label
Copy the verified code or export the batch. Platform and carrier pages keep local rules in view.
About
About Zipcodebase
Zipcodebase offers a worldwide postal-code API with a free plan of 5,000 requests, paid plans, and distance and radius queries. It is built for developers integrating postal data.
PostcodeDog is a lookup product for 82 countries with a browser, batch, API and MCP; it is free and needs no account.
When PostcodeDog is the better fit
- 01You want a lookup page, not only an API endpoint.
- 02You need to clear a small batch without a script.
- 03You want an API and MCP without a key for basic use.
- 04Your support team works across several languages.
Is Zipcodebase free?
Zipcodebase has a free plan with 5,000 requests and paid plans. PostcodeDog’s lookup, batch, API and MCP are free and need no key for basic use.
Can I use PostcodeDog as an API?
Yes. The JSON API is free to call, and the MCP server is available for AI clients.
Is PostcodeDog free?
Yes. Lookups, batch checks, the JSON API and the MCP server are free and need no account.
Can I use it in an AI agent?
Yes. The MCP server is at /mcp, and the JSON API is free to call.
Compare
Go from endpoint to answer.
Try a post code in the browser, then call the same lookup from your code.