Does anyone know if there is a site that let's you search the (Christian) Bible and also provides an API to their search? Preferably free but not mandatory. Support of the NIV would also be ideal.
Faithlife (publisher of the Logos Bible software) has the Biblia.com API, with "services that get information about the available Bibles (Find, Image), download the text of those Bibles (Content), and search those Bibles (Search). Additional services support validating Bible references (Parse), comparing Bible references (Compare), and finding Bible references in text and HTML (Scan, Tag)."
They also offer a Reftagger API that provides an instant popup of a verse's text when you have the verse reference listed. It looks to be a nice alternative to just having the text listed straight away.
I'm not sure if this is exactly what you are after but I found ESV's web service to look pretty good:
Hope that helps
Bible.org has a nice API that will allow you to pull text to embed directly on your site. It is using standard web requests, so it shouldn't be anything difficult to implement. I'm not quite sure what version they are using.
eBible.com exposes an API.
BibleSearch has a pretty solid API with lots of popular versions. It's also free and has loads of ongoing developer support. http://biblesearch.americanbible.org/pages/api
I love Bible Gateway. The URLs are easily replicable, and they have a variety of translations, including the NIV.
I don't know if this qualifies as an API, per se, but it's how I do automated searches.
For clean Bible reading and sharing comments with fellow Bible students: http://www.cloudstudybible.com/