Our API directory now includes 70 jobs APIs. The newest is the O*NET API. The most popular, in terms of mashups, is the indeed API. We list 34 indeed mashups. Below you'll find some more stats from the directory, including the entire list of jobs APIs. 
In terms of the technical details, REST and XML lead the way. There are 42 jobs REST APIs and 14 jobs SOAP APIs. Our directory lists 50 jobs XML APIs and 33 jobs JSON APIs. 
The most common tags within jobs are 18 recruiting jobs APIs, 9 enterprise jobs APIs and 8 search jobs APIs.
On the mashup side, we list 72 jobs mashups. We named Ascendify as mashup of the day in [month]. For reference, here is a list of all 70 jobs APIs.
ApnaCircle API: Business and career networking site.Track this API
Authentic Jobs API: Job search services for developers and designers.Track this API
Bullhorn Staffing API: Job recruiting info service.Track this API
CareerBuilder API: Job and recruiting service.Track this API
Careerjet API: Job search service.Track this API
CareerOneStop API: U.S. Department of Labor career information service.Track this API
Catsone API: Recruiting information service.Track this API
Christian Social Graph API: Christian volunteer opportunities directory.Track this API
CodeMunch API: Job listing platform.Track this API
Cofundos API: Service and network for open source collaboration.Track this API
Copify API: Online copywriting agency.Track this API
DoYouBuzz API: Resume management platform.Track this API
Elance API: Online job marketplace.Track this API
Employrium API: Job posting management tool.Track this API
EuroCV API: Online Curriculum Vitae service.Track this API
Field Nation API: Field technician provider.Track this API
Freelancer API: Job search and recruiting service for freelancers.Track this API
Getafreelancer API: Freelance programmer database.Track this API
Gigwalk API: Mobile workforce service.Track this API
Gloomshade API: Remote media company.Track this API
Google Base API: Platform for structure and semi-structured data.Track this API
Hackruiter API: Job recruiting info service.Track this API
Há Greve API: Portugese Strike Information.
HireAbility ALEX API: Résumé document processing and formatting service.Track this API
HireRight API: Human resources hiring screening service.Track this API
indeed API: Job search services.Track this API
Inside Higher Ed API: Higher education job listing.Track this API
Interserve Job Openings API: Ministry jobs feed service.Track this API
JobCentral Jobs API: Job search services.Track this API
JobCrank API: Job search and posting.Track this API
Jobg8 API: Job search marketplace.Track this API
JobGizmo API: Job search tools.Track this API
JobMotel API: Job feeds service.Track this API
JobServe API: Job listing and recruitment service.Track this API
Juju Publisher API: Job search engine.Track this API
JustJobs.ro API: Romanian job search site.
LinkUp Job Search Engine API: Job search service.Track this API
LiveWork API: On demand virtual workforce of freelancers.Track this API
Masterbranch API: Online platform for developers and development projects.Track this API
MobileWorks API: Crowd-sourcing employment platform.Track this API
Monster Web Services Toolkit API: Recruiting and job search tools.Track this API
O*NET API: U.S. occupation and job information service.Track this API
oDesk API: Marketplace for freelancers.Track this API
Online Talent Manager API: Workplace-focused personality testing service.Track this API
OppsPlace API: MInority employment, and business opportunity service.Track this API
Peerlo JobGenie API: Job recruiting and referral service.Track this API
PopCV Semantic API: application processing service.Track this API
ProfessionL API: Recruitment management platform.Track this API
Raveal API: Online job search service.Track this API
Reppify API: Online background check service.Track this API
Resfly API: Job posting service.Track this API
RezScore API: Resume scoring service.Track this API
Rijksoverheid CSO API: Dutch government job recruiting service.Track this API
Simply Hired Jobs API: Job search services.Track this API
SmashFly API: Job board posting service.Track this API
TalentBin API: Social recruiting service.Track this API
TechSavvy API: Technology job listing site.Track this API
teleNetwork API: Tech support outsourcing job application service.Track this API
The Interviewr API: Interview scheduling and conducting platform.Track this API
Tianji API: Chinese business social networking platform.Track this API
Tribe HR API: Online human resource application.Track this API
UK Civil Service API: UK public sector job service.Track this API
VetSuccess API: U.S. military veterans employment service.Track this API
WorkMarket API: Labor Resource Platform.Track this API
WriterAccess API: Writing content marketplace and publishing platform.Track this API
WyzAnt ShareASale Affiliate Program API: Online tutoring marketplace.Track this API
Zijob API: French job search service.Track this API
Zipster API: Australian job search site.Track this API
Zoho Recruit API: Applicant tracking system.Track this API
Zubka API: Job board and referral service.Track this API
What a huge list! Thanks, Wendell!
Most of this links are dead!
I am actually amazed at how this industry is developing these days. I mean, it used to be some job postings here and there, and before you know it, AI, algorithms and what not have taken over, with these fancy new freelance platforms appearing all the time. Take Insolvo for instance which nobody heard of until recently, when suddenly I'm getting a good portion of my writing gigs from there. Good stuff!