We dropped our previous address lookup for Postio in an afternoon. Customer drop-off at checkout fell, the API is fast, and the price is honest.
lovebird.co.ukUK address, email & phone validation. One flat price per request. No tiers. No contracts. Prepay with any card.
Full UK PAF coverage — 30M addresses. Postcode in, structured address out. Royal Mail synced nightly.
Read docsSyntax, MX records, SMTP handshake, and disposable detection. Includes typo suggestions (gmial → gmail).
Read docsUK mobile, landline, and VoIP detection with carrier lookup. Normalises to E.164 — or rejects.
Read docsNo status page theatre.
The API is plain REST. Official SDKs for the languages that want one — everything else works with fetch.
# Plain REST. One header — x-api-key. curl 'https://api.postio.co.uk/v1/address/postcode/W1G8YW' \ -H "x-api-key: $POSTIO_KEY"
SDKs for every major language. Plugins for WordPress, Shopify, and WooCommerce. One-click Zapier app. Postman collection on the docs.
Pay only for what you use. No tiers, no minimums, no annual contract.
Hosted in London. Address & email stay in the UK; phone checks use an EU carrier network.
Query PII obfuscated after 30 days, configurable per key. DPA available.
Licensed Royal Mail PAF Solutions Provider. Synced nightly, always current.
If we miss it — we credit your balance pro-rata.
We dropped our previous address lookup for Postio in an afternoon. Customer drop-off at checkout fell, the API is fast, and the price is honest.
lovebird.co.ukIt's a single script tag. We rolled Postio into three client sites in a week — none of them needed us to touch the form code beyond the snippet.
bigg.co.ukThe data is what we expected. The bit that genuinely surprised us was the support — replies in hours, not days, from someone who actually knew the answer.
xota.co.ukSign up, grab a key, paste it in. Your first hundred lookups are on us.