Everyone’s waiting to see a launch of Pinterest API. Pinterest had a working API which they took down for some unclaimed reasons. Some users have managed to take a cached version of Pinterest API docs online and can be found at http://tijn.bo.lt/pinterest-api .
You are not able to use the oAuth calls from these API docs, but you can successfully read data via these API docs, even for that you need to send correct headers to emulate calls such that they are coming from Pinterest iPhone app.
Correct headers are:-
User-Agent: Pinterest For iPhone / 1.4.3
There are news going around that Pinterest is scared of having a problem like twitter, where spammers used API very intelligently to bombard twitter with a lot of crap data. Twitter still having a hard time to tackle these spam accounts big time http://articles.businessinsider.com/2012-03-26/tech/31238519_1_mobile-apps-twitterrific-hootsuite . We hope that these fears don’t put Pinterest people off track of developing a full fledged API.
Want more of updated development. Join Pinterest unofficial API developer Group here on facebook https://www.facebook.com/groups/pinterestapi/
One implementation of Pinterest API at Github. Still to test it though by me. https://github.com/kellan/pinterest.api.php