# SPP Integrated Marketplace Markets Web Service

**Canonical:** https://apis.io/apis/spp/spp-integrated-marketplace-web-services/  
**Provider:** Southwest Power Pool — https://apis.io/providers/spp/  
**Documentation:** https://www.spp.org/documents/73131/spp%20system%20interfaces%20stakeholder%20reference%20guide%2020250129.pdf

SPP Integrated Marketplace Markets Web Service is one of 6 APIs that [Southwest Power Pool](https://apis.io/providers/spp/) publishes on the [APIs.io](https://apis.io/) network. Tagged areas include SOAP, Wholesale Markets, Settlement, and Gated. The published artifact set on APIs.io includes API documentation.

The SOAP web and notification services market participants use to submit offers and bids and retrieve results from the SPP Integrated Marketplace, with WEIS Markets Web Service as the western equivalent and the Settlement Management System API for settlements. SPP's System Interfaces Stakeholder Reference Guide (v1.0, 29 Jan 2025) names these as SOAP and REST services over HTTPS requiring two-factor authentication; the Markets+ platform is stated to move to RESTful APIs. WSDLs, XSDs and endpoint URLs are published only inside the member-facing Change User Forum technical reference documents and were not retrievable anonymously; no base URL is public.

## Machine-readable artifacts (3)

- **Documentation** — https://www.spp.org/documents/73131/spp%20system%20interfaces%20stakeholder%20reference%20guide%2020250129.pdf
- **Documentation** — https://www.spp.org/stakeholder-center/user-guides-apis-integrations/
- **Documentation** — https://www.spp.org/documents/18307/digital%20certificates%20and%20the%20integrated%20marketplace%20doc_final.pdf

## Other Southwest Power Pool APIs (5)

- [SPP Public Data FTP](https://apis.io/apis/spp/spp-public-data-ftp/)
- [SPP Portal Public Data File Browser API](https://apis.io/apis/spp/spp-portal-file-browser-api/)
- [SPP Portal Chart API](https://apis.io/apis/spp/spp-portal-chart-api/)
- [SPP Price Contour Map ArcGIS REST Services](https://apis.io/apis/spp/spp-price-contour-map-arcgis/)
- [SPP LEP/TROLIE Ratings API](https://apis.io/apis/spp/spp-lep-trolie-api/)

## Tags

SOAP, Wholesale Markets, Settlement, Gated

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Profiled by [API Evangelist](https://apievangelist.com) and published on [APIs.io](https://apis.io/apis/spp/spp-integrated-marketplace-web-services/). The API's provider profile, Kin Score and agent-readiness rating are at https://apis.io/providers/spp/.