Adzuna API vs TheirStack for AI agents
Adzuna API is a REST API from the Adzuna job search engine for searching its job ads plus salary and labour-market data. TheirStack is a job postings data API (with company and technographic data) aimed at sales and market intelligence as well as job search.
The short answer
- Adzuna API: Building a job board or labour-market tool with an aggregated, multi-country job feed plus salary data.
- TheirStack: Bulk, filterable job-posting data for market research and sales signals, with history back to 2021.
Side by side
| Adzuna API | TheirStack | |
|---|---|---|
| Searches | Adzuna's aggregated job ads, queried per country via a two-letter code in the URL (docs examples use gb). | Aggregated postings from career pages, job boards and ATS platforms across about 363k websites in 195 countries, since 2021. |
| Returns | JSON results with id, title, a description snippet, company.display_name, location, category, salary_min/salary_max, salary_is_predicted, contract_type, created, latitude/longitude and redirect_url. | JSON jobs with title, description, url, final_url, source_url, company and company_object, location fields, min/max salary (plus annual USD) and salary_string. |
| Before the first call | Register for an app_id and app_key, sent as query parameters on every call. | A TheirStack account and API key (Bearer token); each search must include at least one date or company filter. |
| Free | Default limits of 25 hits per minute, 250 per day, 1,000 per week and 2,500 per month; commercial use is permitted subject to a 14-day trial. | 200 API credits and 50 company credits every month, free (1 credit per job returned); free tier rate limit 4/second, 10/minute, 50/hour, 400/day. |
| Paid | Not stated on its pages | From $49 per month for 1,500 API credits (1 credit per job). |
| Acting on a result | redirect_url; the documented examples point to adzuna.co.uk/jobs/land/ad/... (through Adzuna), not straight to the employer. | url, plus final_url with the original career-page URL when available (filterable with final_url_exists). |
| Limits on keeping or showing results | Each displayed ad must carry an 'Adzuna' label at least 116x23 px, linked to Adzuna; on termination all Adzuna data must be removed; after the trial a licence agreement may be required. | Not stated on its pages |
| Coverage | Not stated on its pages | 195 countries. |
| MCP server | No official server listed | Official TheirStack MCP server (search_jobs tool), OAuth or API key; uses the same API credits: https://theirstack.com/en/docs/mcp |
Where Openpath fits
If the agent needs a job to apply for in Austin, Texas, or a remote one, Openpath returns the listings themselves, free and with no key. See Openpath vs Adzuna API and Openpath vs TheirStack.
Questions people ask
What do I need before I can use Adzuna API?
Register for an app_id and app_key, sent as query parameters on every call.
Is Adzuna API free?
Default limits of 25 hits per minute, 250 per day, 1,000 per week and 2,500 per month; commercial use is permitted subject to a 14-day trial.
What do I need before I can use TheirStack?
A TheirStack account and API key (Bearer token); each search must include at least one date or company filter.
Is TheirStack free?
200 API credits and 50 company credits every month, free (1 credit per job returned); free tier rate limit 4/second, 10/minute, 50/hour, 400/day.
Sources
Every line about another company comes from its own pages. Prices and terms change, so check the source before you rely on one.
Adzuna API, read on October 15, 2026:
- developer.adzuna.com/overview: “two obligatory parameters”
- developer.adzuna.com/docs/terms_of_service: “250 hits per day”
- developer.adzuna.com/docs/terms_of_service: “permitted subject to a 14 day trial period”
- developer.adzuna.com/docs/terms_of_service: “a licence agreement may be required”
- developer.adzuna.com/docs/terms_of_service: “label each displayed advert with the phrase "Adzuna" at least 116 X 23 pixels in size”
- developer.adzuna.com/docs/search: “we currently only provide a snipped of the job description”
- developer.adzuna.com/docs/search: “http://adzuna.co.uk/jobs/land/ad/129698749”
TheirStack, read on October 15, 2026:
- theirstack.com/en/job-posting-api: “253M of jobs across 195 countries since 2021”
- theirstack.com/en/job-posting-api: “career pages, job boards, and ATS platforms”
- theirstack.com/en/docs/pricing/plans: “Start exploring with 50 company credits and 200 API credits every month - completely free, forever.”
- theirstack.com/en/docs/api-reference/rate-limit: “4/second, 10/minute, 50/hour, 400/day”
- theirstack.com/en/pricing: “1,500 API credits — $49 per month”
- theirstack.com/en/docs/api-reference/jobs/search_jobs_v1: “1 API credit for each job returned in the response”
- theirstack.com/en/job-posting-mcp: “Your AI assistant calls the search_jobs tool to find jobs by title, location, salary”