# Peer39

**Canonical:** https://apis.io/providers/peer39/  
**Website:** https://www.peer39.com  
**APIs profiled:** 1

Peer39 is a contextual advertising and intelligence company that provides pre-bid controls and post-buy analytics built on verified contextual data for programmatic media buyers. Its platform delivers contextual targeting, brand safety and suitability, and contextual analytics across web, mobile, and connected TV (CTV) and video environments, helping advertisers and platforms make privacy-forward, cookieless media decisions. Peer39 was surfaced as a portfolio company of Canaan Partners and added to the API Evangelist network. Peer39 does operate a real REST API — the Peer39 External API at https://app.peer39.com/api/external — for creating, updating and deleting Custom Categories (contextual targeting and brand-safety lists of keywords, URLs, mobile apps and CTV apps) and syncing them to connected DSPs such as The Trade Desk, Microsoft Advertising/Xandr, Basis, Yahoo and Amazon. That API is entirely undocumented in public: there is no developer portal, no API reference page, no OpenAPI specification and no published SDK. Credentials are provisioned by a Peer39 account or integration manager who grants the "External API" and "RTB Buyer" roles on a named account, and API documentation is distributed as PDFs rather than published on the web. A first-party-authored MCP server for the API exists in pre-release on a personal GitHub account and is the only public description of the surface.

## Kin Score — 20.5 / 100 (emerging)

Scored 2026-08-17 under rubric 0.11.0. Trend: flat (+0.0 from 20.5).

| Facet | Score |
|---|---|
| Discoverability | 87.0 |
| Contract Quality | 0.0 |
| Governance | 12.5 |
| Operational Transparency | 0.0 |
| Developer Ergonomics | 17.4 |
| Commercial Clarity | 34.2 |

## Agent readiness — 6.8 (agent-aware)

| Dimension | Value |
|---|---|
| Spec Presence | no |
| Agentic Access | no |
| MCP Server | no |
| Auth Clarity | no |
| Idempotency | no |
| Error Semantics | no |
| OpenAPI Examples | no |
| Rate Limit Signal | documented |
| Event Surface Described | no |
| Agent Skills | no |
| Well Known Catalog | yes |
| Consent Identity | no |
| Agent Card | no |
| Dry Run Mode | no |

## Access

Enterprise / Contact Sales — onboarding: unknown, pricing: enterprise, trial: no (confidence: high).

## APIs (1)

- **Peer39 External API** — The Peer39 External API manages Custom Categories — contextual targeting and brand-safety lists of keywords, URLs, mobile apps or CTV apps — and syncs them to a connected DSP pa...

## MCP servers (1)

- **peer39-mcp.yml**

## Security (2)

- **Peer39 Authentication** — 2 schemes
- **Peer39 Domain Security** — TLSv1.3 · HSTS · DMARC

## Plans (1)

- **Peer39 Plans Pricing**

## Tags

Company, Contextual Advertising, AdTech, Brand Safety, Programmatic Advertising, Contextual Targeting, CTV, MarTech, Advertising, Custom Categories, DSP

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Profiled by [API Evangelist](https://apievangelist.com) and published on [APIs.io](https://apis.io/providers/peer39/). Scores are computed from the provider's own public artifacts under a published rubric.