> For the complete documentation index, see [llms.txt](https://docs.coresignal.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.coresignal.com/api-introduction.md).

# API introduction

- [APIs Overview](https://docs.coresignal.com/api-introduction/apis-overview.md): Overview of all Coresignal APIs for fresh company, employee, and jobs data – including a Real-time Employee API for real-time data access.
- [Authorization](https://docs.coresignal.com/api-introduction/authorization.md): Authenticate Coresignal API requests with your API key. Learn where to obtain it and how to send it in the apikey request header across common clients.
- [Credits](https://docs.coresignal.com/api-introduction/credits.md): Understand how Coresignal's credit system works. Credits are deducted per successful request when accessing fresh data via Search and Collect APIs.
- [Rate Limits](https://docs.coresignal.com/api-introduction/rate-limits.md): API rate limit reference for all Coresignal endpoints. Optimize fresh data streaming without hitting Search or Collect thresholds.
- [Response Codes](https://docs.coresignal.com/api-introduction/response-codes.md): Complete reference for all Coresignal API response codes – covering Search, Collect, Bulk Collect, Webhooks, and the Real-time Employee API.
- [Requests](https://docs.coresignal.com/api-introduction/requests.md)
- [Elasticsearch DSL](https://docs.coresignal.com/api-introduction/requests/elasticsearch-dsl.md): Write powerful queries against Coresignal's fresh data using Elasticsearch DSL. Includes schema links, input values, sorting options, and query tips.
- [Results Pagination](https://docs.coresignal.com/api-introduction/requests/elasticsearch-dsl/results-pagination.md)
- [Semantic Search](https://docs.coresignal.com/api-introduction/requests/semantic-search.md): Use Elasticsearch DSL semantic search endpoints to expand job title queries with synonym matches, improving recall without changing the request format.
- [Search Filters](https://docs.coresignal.com/api-introduction/requests/search-filters.md): Filter company, employee, job, and post datasets with simple API parameters. A practical alternative to Elasticsearch DSL for retrieving matching record IDs.
- [Search Preview](https://docs.coresignal.com/api-introduction/requests/search-preview.md): Search Preview returns up to 20 matching records with fresh data in a single API call. With pagination, preview up to 1,000 records.
- [Collect and Enrich](https://docs.coresignal.com/api-introduction/requests/collect.md): Retrieve individual records by ID or shorthand name, or enrich data from a website or profile URL. Learn to request complete records or select specific fields.
- [Bulk Collect](https://docs.coresignal.com/api-introduction/requests/bulk-collect.md): Retrieve multiple records in a single request across supported APIs. Learn about credit usage and how to control results with the optional limit parameter.
- [POST Requests](https://docs.coresignal.com/api-introduction/requests/bulk-collect/post-requests.md)
- [GET Requests](https://docs.coresignal.com/api-introduction/requests/bulk-collect/get-requests.md)
- [Webhooks](https://docs.coresignal.com/api-introduction/webhooks.md): Get real-time notifications on employee profile changes via webhooks. Subscriptions are valid for 91 days with no credit deduction per notification.
- [Experience Webhooks](https://docs.coresignal.com/api-introduction/webhooks/experience-webhooks.md): Receive notifications when employee experience records add or close positions.
- [Employee Webhooks](https://docs.coresignal.com/api-introduction/webhooks/employee-webhooks.md): Receive employee profile change notifications and filter subscriptions by tracked fields.
- [Subscription Management](https://docs.coresignal.com/api-introduction/webhooks/subscription-management.md): View, renew, and delete webhook subscriptions using the subscription management endpoints.
- [Subscription Simulation](https://docs.coresignal.com/api-introduction/webhooks/subscription-simulation.md): Test subscription webhooks by sending a simulated event to your callback URL.


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