> For the complete documentation index, see [llms.txt](https://docs.ionos.com/cloud/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.ionos.com/cloud/api-reference/storage-and-backup/ionos-object-storage/ionos-object-storage-for-contract-owned-buckets/overview.md).

# Overview

The IONOS CLOUD Object Storage API for contract-owned buckets is a REST-based API that allows developers and applications to interact directly with IONOS' scalable storage solution, leveraging the S3 protocol for object storage operations. Its design ensures seamless compatibility with existing tools and libraries tailored for S3 systems.

#### API References

* [Object Storage Management API Reference](https://api.ionos.com/docs/s3-management/v1/) for managing Access Keys
* Object Storage API Reference for contract-owned buckets - current document
* [Object Storage API Reference for user-owned buckets](https://api.ionos.com/docs/s3-user-owned-buckets/v2/)

#### User documentation

[IONOS CLOUD Object Storage User Guide](https://docs.ionos.com/cloud/storage-and-backup/ionos-object-storage)

* [Documentation on user-owned and contract-owned buckets](https://docs.ionos.com/cloud/managed-services/s3-object-storage/concepts/buckets)
* [Documentation on S3 API Compatibility](https://docs.ionos.com/cloud/managed-services/s3-object-storage/concepts/s3-api-compatibility)
* [S3 Tools](https://docs.ionos.com/cloud/managed-services/s3-object-storage/s3-tools)


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