# IonQ Quantum Cloud API (v0.3 Legacy)

**Canonical:** https://apis.io/apis/ionq/ionq-quantum-cloud-api-v0-3/  
**Provider:** IonQ — https://apis.io/providers/ionq/  
**Base URL:** https://api.ionq.co/v0.3  
**Documentation:** https://docs.ionq.com/api-reference/v0.3/introduction

IonQ Quantum Cloud API (v0.3 Legacy) is one of 7 APIs that [IonQ](https://apis.io/providers/ionq/) publishes on the [APIs.io](https://apis.io/) network. Tagged areas include Quantum Computing, Trapped Ion, QPU, and Legacy. The published artifact set on APIs.io includes API documentation.

The previous-generation IonQ Quantum Cloud REST API (v0.3) for submitting and managing jobs, characterizations, backends, and reports. Superseded by v0.4 which adds Sessions, separated cost/results endpoints, and restructured characterizations. v0.3 remains supported for existing integrations.

## Machine-readable artifacts (4)

- **Documentation** — https://docs.ionq.com/api-reference/v0.3/introduction
- **Documentation** — https://docs.ionq.com/api-reference/v0.3/migrating-from-old-versions
- **Documentation** — https://docs.ionq.com/api-reference/v0.4/migration-from-v0.3
- **APIsJSON** — https://raw.githubusercontent.com/api-evangelist/ionq/refs/heads/main/apis.yml

## Other IonQ APIs (6)

- [IonQ backends API](https://apis.io/apis/ionq/ionq-backends-api/)
- [IonQ characterizations API](https://apis.io/apis/ionq/ionq-characterizations-api/)
- [IonQ Jobs API](https://apis.io/apis/ionq/ionq-jobs-api/)
- [IonQ Sessions API](https://apis.io/apis/ionq/ionq-sessions-api/)
- [IonQ usage API](https://apis.io/apis/ionq/ionq-usage-api/)
- [IonQ whoami API](https://apis.io/apis/ionq/ionq-whoami-api/)

## Tags

Quantum Computing, Trapped Ion, QPU, Legacy

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Profiled by [API Evangelist](https://apievangelist.com) and published on [APIs.io](https://apis.io/apis/ionq/ionq-quantum-cloud-api-v0-3/). The API's provider profile, Kin Score and agent-readiness rating are at https://apis.io/providers/ionq/.