# BidMachine OpenRTB Auction API

**Canonical:** https://apis.io/apis/bidmachine-io/bidmachine-openrtb-auction-api/  
**Provider:** BidMachine — https://apis.io/providers/bidmachine-io/  
**Base URL:** https://api-eu.bidmachine.io/auction/prebid/  
**Documentation:** https://developers.bidmachine.io/sdk/general/bidder

BidMachine OpenRTB Auction API is one of 3 APIs that [BidMachine](https://apis.io/providers/bidmachine-io/) publishes on the [APIs.io](https://apis.io/) network. Tagged areas include Advertising, OpenRTB, Ad Exchange, and Real-Time Bidding. The published artifact set on APIs.io includes API documentation and an API reference.

OpenRTB 2.5 bid endpoint for in-house bidders and supply partners integrating through the BidMachine SDK: one impression per bid request, first-price auction, USD only, regional endpoints in the EU, US and APAC keyed by source id. The demand-side (DSP) integration uses the same OpenRTB 2.3/2.5 protocol with BidMachine calling the DSP's endpoint. Published as prose field specifications and JSON examples, not as a machine-readable contract.

## Machine-readable artifacts (6)

- **Documentation** — https://developers.bidmachine.io/sdk/general/bidder
- **APIReference** — https://developers.bidmachine.io/sdk/ssp/request/specification
- **APIReference** — https://developers.bidmachine.io/dsp/bid-request/specification
- **Documentation** — https://developers.bidmachine.io/dsp/overview
- **Sandbox** — https://raw.githubusercontent.com/api-evangelist/bidmachine-io/refs/heads/main/sandbox/bidmachine-io-sandbox.yml
- **Sandbox** — https://developers.bidmachine.io/sdk/ssp/testing

## Other BidMachine APIs (2)

- [BidMachine Placement Management API](https://apis.io/apis/bidmachine-io/bidmachine-placement-management-api/)
- [BidMachine Reporting API](https://apis.io/apis/bidmachine-io/bidmachine-reporting-api/)

## Tags

Advertising, OpenRTB, Ad Exchange, Real-Time Bidding

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