aid: appnexus
name: AppNexus
description: >-
  AppNexus was a New York-based programmatic advertising technology company that ran one of the
  largest independent real-time online ad exchanges alongside a cloud-based buy-side and sell-side
  platform for advertisers, agencies, and publishers. AT&T acquired AppNexus in 2018 and rebranded
  it Xandr; it is now part of Microsoft. Its developer surface lives on as the Xandr Digital Platform
  API (host api.appnexus.com) - a RESTful JSON API for campaign, creative, inventory, deal, and
  reporting operations - plus the first-party AppNexus mobile advertising SDKs for Android and iOS.
  This profile was enriched by the API Evangelist pipeline from the public developer documentation.
accessModel:
  pricing: unknown
  onboarding: unknown
  trial: false
  try_now: false
  public: false
  label: Unknown
  confidence: low
  source:
  - authentication
  generated: '2026-07-22'
  method: derived
image: https://raw.githubusercontent.com/api-evangelist/appnexus/refs/heads/main/apis.yml
url: https://raw.githubusercontent.com/api-evangelist/appnexus/refs/heads/main/apis.yml
x-type: company
x-source: vc-portfolio
x-backed-by:
- first-round-capital
x-tier: stub
x-tier-reason: portfolio-lead
x-successor: xandr
specificationVersion: '0.20'
created: '2026-07-17'
modified: '2026-07-17'
tags:
- Company
- Adtech
- Advertising
- Programmatic
- Ad Exchange
- DSP
- SSP
- Mobile SDK
- Marketing
apis:
- name: Digital Platform API
  description: >-
    RESTful JSON API for the AppNexus/Xandr programmatic advertising platform - manage advertisers,
    campaigns, line items, creatives, placements, inventory, deals, and pull reporting. Token
    authentication, offset pagination (start_element/num_elements), and a response/error envelope.
  humanURL: https://learn.microsoft.com/xandr/digital-platform-api/
  baseURL: https://api.appnexus.com
  tags:
  - Advertising
  - Programmatic
  - Adtech
  properties:
  - type: Documentation
    url: https://learn.microsoft.com/xandr/digital-platform-api/
  - type: APIReference
    url: https://learn.microsoft.com/xandr/digital-platform-api/api-services
  - type: Authentication
    url: authentication/appnexus-authentication.yml
  - type: Conventions
    url: conventions/appnexus-conventions.yml
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com
- FN: APIs.json
  email: info@apis.io
common:
- type: Website
  url: https://www.appnexus.com
- type: DeveloperPortal
  url: https://learn.microsoft.com/xandr/digital-platform-api/
- type: Documentation
  url: https://learn.microsoft.com/xandr/digital-platform-api/
- type: APIReference
  url: https://learn.microsoft.com/xandr/digital-platform-api/api-services
- type: GettingStarted
  url: https://learn.microsoft.com/xandr/digital-platform-api/api-onboarding-process
- type: GitHubOrganization
  url: https://github.com/appnexus
- type: Authentication
  url: authentication/appnexus-authentication.yml
- type: Conventions
  url: conventions/appnexus-conventions.yml
- type: ErrorCatalog
  url: errors/appnexus-error-codes.yml
- type: Lifecycle
  url: lifecycle/appnexus-lifecycle.yml
- type: Deprecation
  url: https://learn.microsoft.com/xandr/digital-platform-api/breaking-changes
- type: ChangeLog
  url: https://learn.microsoft.com/xandr/digital-platform-api/api-release-notes
- type: Sandbox
  url: sandbox/appnexus-sandbox.yml
- type: Packages
  url: packages/appnexus-packages.yml
- type: SDKs
  name: AppNexus Android Mobile SDK
  url: packages/appnexus-packages.yml
- type: SDKs
  name: AppNexus iOS Mobile SDK
  url: packages/appnexus-packages.yml
- type: DomainSecurity
  url: security/appnexus-domain-security.yml
- type: LLMsTxt
  url: llms/appnexus-llms.txt
x-enrichment:
  date: '2026-07-19'
  status: backfilled
  pass: local-v1
  note: backfilled from .gitignore signal + verified work evidence