generated: '2026-09-07'
method: probed
source: >-
  live fetches of https://sso.essendant.com/adfs/.well-known/openid-configuration,
  https://sso.essendant.com/adfs/services/trust/mex,
  https://sso.essendant.com/FederationMetadata/2007-06/FederationMetadata.xml and
  https://www.essendant.com/llms.txt
note: >-
  Essendant publishes no API contract, so every contract-shaped standard below is recorded
  false with the probe that established it. The true entries are identity and content
  standards it demonstrably serves. Its trading-partner integration surface is EDI
  (ANSI ASC X12 / UN-EDIFACT purchase orders, ASNs and invoices) plus the ECDB product
  content feed, both of which are arranged per customer and were not verifiable from a
  public document — so they are recorded as unverified rather than as conformance.
standards:
- id: openid-connect-discovery
  conforms: true
  evidence: >-
    https://sso.essendant.com/adfs/.well-known/openid-configuration returns 200 with a
    parsing OIDC discovery document (issuer, jwks_uri, authorization_endpoint,
    token_endpoint, userinfo_endpoint); the same at login.essendant.com.
- id: oauth2
  conforms: true
  evidence: >-
    grant_types_supported includes authorization_code, client_credentials, refresh_token
    and urn:ietf:params:oauth:grant-type:device_code in both discovery documents.
- id: rfc8628-device-authorization
  conforms: true
  evidence: device_authorization_endpoint https://sso.essendant.com/adfs/oauth2/devicecode
- id: saml2
  conforms: true
  evidence: >-
    https://sso.essendant.com/FederationMetadata/2007-06/FederationMetadata.xml returns a
    signed urn:oasis:names:tc:SAML:2.0:metadata EntityDescriptor (entityID
    http://sso.essendant.com/adfs/services/trust); same shape at login.essendant.com.
- id: ws-trust
  conforms: true
  evidence: >-
    https://sso.essendant.com/adfs/services/trust/mex returns a WSDL 1.1
    SecurityTokenService definition. Microsoft AD FS stock contract, not an
    Essendant-authored service.
- id: llmstxt
  conforms: true
  evidence: >-
    https://www.essendant.com/llms.txt returns 200 text/plain, 19,870 bytes, generated by
    All in One SEO Pro v4.9.7.2 — a real llms.txt index of the site's posts and pages.
- id: rfc8414-oauth-authorization-server-metadata
  conforms: false
  evidence: /.well-known/oauth-authorization-server 503 on sso, 404 on login/adfs.
- id: rfc9728-oauth-protected-resource
  conforms: false
  evidence: /.well-known/oauth-protected-resource returned no document on any host.
- id: rfc9116-security-txt
  conforms: false
  evidence: /.well-known/security.txt 404 on www.essendant.com, 503 on the identity hosts.
- id: openapi
  conforms: false
  evidence: >-
    No OpenAPI/Swagger document at any probed root on www.essendant.com, essendant.com,
    api.essendant.com (404), sso/login.essendant.com or www.biggestbook.com.
- id: asyncapi
  conforms: false
  evidence: No event, streaming or webhook specification published.
- id: graphql
  conforms: false
  evidence: No /graphql surface found on any Essendant host.
- id: mcp
  conforms: false
  evidence: No hosted or stdio MCP server published or listed in any registry.
- id: a2a-agent-card
  conforms: false
  evidence: >-
    /.well-known/agent-card.json and /.well-known/agent.json returned 404 on
    www.essendant.com, 503 on the identity hosts, and the SPA catch-all shell on
    www.biggestbook.com. No card exists.
- id: rfc9457-problem-details
  conforms: false
  evidence: No API contract to evaluate.
- id: apis-json
  conforms: false
  evidence: /apis.json, /apis.yml and /.well-known/apis.json returned no index on any host.
domain_standards:
- id: ansi-x12-edi
  conforms: unverified
  market: wholesale distribution / supply chain
  evidence: >-
    Essendant is documented by multiple EDI VANs and integrators as a trading partner
    exchanging 850/855/856/810 documents, but no Essendant-published EDI implementation
    guide or trading-partner spec is reachable without a customer account, so this is
    recorded unverified rather than as a conformance claim.
- id: gs1-gtin-upc
  conforms: unverified
  market: wholesale distribution
  evidence: >-
    https://info.essendant.com/ecdb-std (200) describes an ECDB item table carrying a
    "Retail UPC" column, implying GTIN-keyed product content; the feed and its technical
    guide are distributed inside the customer download folder, not published.
- id: ghs-sds
  conforms: true
  market: hazardous materials labelling
  evidence: >-
    https://www.essendant.com/ghs-compliance/ is published in Essendant's own llms.txt as
    its GHS (Globally Harmonized System) hazard-communication page, and the ECDB feed
    documents MSDS image URLs per item.