generated: '2026-07-27'
method: searched
source: live anonymous requests to SPP hosts on 2026-07-27
note: >-
  Real, unedited responses captured from SPP's anonymous surfaces. SPP publishes
  no examples, no code samples and no specification for these endpoints, so these
  captures are the only concrete payload shapes available. Each entry records the
  exact request URL, HTTP status, content type and byte count at capture time.
  Live values change every five minutes; these are point-in-time samples, not a
  contract.
examples:
- file: spp-rtbm-mcp-latest-interval.csv
  url: https://portal.spp.org/file-browser-api/download/rtbm-mcp?path=/RTBM-MCP-latestInterval.csv
  status: 200
  content_type: text/csv
  bytes: 1002
  api: spp:spp-portal-file-browser-api
  description: >-
    Real-time balancing market clearing prices by reserve zone, latest 5-minute
    interval. Header row Interval, GMTIntervalEnd, Reserve Zone, RegUPService,
    RegDNService, RegUpMile, RegDNMile, RampUP, RampDN, Spin, Supp, UncUP, BAA.
- file: spp-chart-api-gen-mix.json
  url: https://portal.spp.org/chart-api/gen-mix/asChart
  status: 200
  content_type: application/json
  bytes: 4352
  api: spp:spp-portal-chart-api
  description: >-
    Generation-mix chart feed: pie labels per fuel type (Coal, Diesel Fuel Oil,
    Hydro, Natural Gas, Nuclear, Solar, Waste Disposal Services, Wind, Waste
    Heat, Other) with hourly MW series.
- file: spp-arcgis-rest-info.json
  url: https://pricecontourmap.spp.org/arcgis/rest/info?f=json
  status: 200
  content_type: application/json; charset=UTF-8
  bytes: 265
  api: spp:spp-price-contour-map-arcgis
  description: >-
    ArcGIS Server info document. currentVersion 11.5, fullVersion 11.5.0,
    soapUrl https://pricecontourmap.spp.org/arcgis/services, authInfo
    isTokenBasedSecurity true with tokenServicesUrl
    https://pricecontourmap.spp.org/arcgis/tokens/. This is the evidence behind
    the arcgis-token scheme in authentication/spp-authentication.yml.
- file: spp-arcgis-rtbm-lmp-mapserver.json
  url: https://pricecontourmap.spp.org/arcgis/rest/services/PCM/RTBM_LMP/MapServer?f=json
  status: 200
  content_type: application/json; charset=UTF-8
  bytes: 3186
  api: spp:spp-price-contour-map-arcgis
  description: >-
    MapServer service description for the real-time balancing market LMP price
    contours, self-described as updating every five minutes; carries the layer,
    spatial-reference and capability metadata for the geospatial projection of
    the same price data served as CSV.