Scope3

Scope3 is the source of truth for greenhouse-gas emissions data in media and advertising, and operates Scope3 Interchange, an agentic advertising platform where buyer agents and seller storefronts transact on the open Ad Context Protocol (AdCP). Its APIs let buyers, publishers and platforms measure the carbon footprint of every ad impression and creative across channels, benchmark against country/channel percentiles, and run AI-driven programmatic advertising end to end. Scope3 publishes four OpenAPI documents across three surfaces: the Carbon Calculator (Measurement) API at api.scope3.com/v2, the AI Impact Measurement API at aiapi.scope3.com (energy, gCO2e and water per inference), and the Interchange Buyer and Storefront v2 APIs at api.interchange.io with 481 operations between them. Interchange is built for AI agents as primary callers: hosted remote MCP endpoints with OAuth (RFC 8414 metadata, dynamic client registration, PKCE), an A2A agent card, three published Agent Skills, a documented error envelope, IETF draft-7 rate-limit headers and a published IU pricing model. Backed by GV.

Scope3 publishes 16 APIs on the APIs.io network, including Interchange Buyer API, Interchange Storefront API, AI Impact Measurement API, and 13 more. Tagged areas include Company, Enterprise, Advertising, Carbon Emissions, and Sustainability.

The Scope3 catalog on APIs.io includes 1 event-driven AsyncAPI specification.

Scope3’s developer surface includes authentication, CLI, changelog, sandbox, documentation, API reference, getting-started guide, and 33 more developer resources.

🌐 Visit website 📡 Source on GitHub

67.2/100 exemplar ▲ 14.8 Agent 70/100 agent native Full breakdown ↓
scored 2026-08-17 · rubric v0.11.0

AccessSelf serve

16 APIs 1 MCP Servers

CompanyEnterpriseAdvertisingCarbon EmissionsSustainabilityAdTechMeasurementArtificial IntelligenceAgenticAdCPMCPProgrammaticMedia BuyingPublishing

Kin Score

Kin Score How this is scored →
scored 2026-08-17 · rubric v0.11.0

Composite quality — 67.2/100 · exemplar

Contract Quality 15.0 / 25

Developer Ergonomics 17.4 / 20

Commercial Clarity 15.3 / 20

Operational Transparency 8.9 / 13

Governance 1.4 / 12

Discoverability 9.3 / 10

Agent readiness — 70/100 · agent native

Machine-Readable Contract 18 / 18

Agentic Access Contract 10 / 10

MCP Server 12 / 12

Machine-Readable Auth 10 / 10

Idempotency 9 / 9

Stable Error Semantics 8 / 8

Request/Response Examples 7 / 7

Rate-Limit Signaling 7 / 7

Typed Event Surface 6 / 6

Agent Skills 5 / 5

Well-Known Catalog 0 / 4

Consent & Bot Identity 0 / 3

A2A Agent Card 8 / 8

Dry-Run / Simulate Mode 0 / 4

Improve this rating by publishing the missing artifacts — every area above can be raised, and the full rubric is at apis.io/rating/. This rating is computed from github.com/api-evangelist/scope3: open an issue to ask a question, or submit a pull request to add artifacts. Want it done for you? Prioritized profiling — $2,500 →

APIs 16

Individual APIs this provider publishes, each with its own machine-readable definition.

Open Collections 15

Open, tool-agnostic API collections (OpenAPI-derived and Bruno).

MCP Servers 1

Model Context Protocol servers that expose these APIs to AI agents.

Rate Limits 1

Documented rate limits and quota policies.

Scopes 1

OAuth scopes governing access to this provider's APIs.

Scope3 Scopes

4 scopes · authorizationCode

4 scopes

SCOPES

Get Started 5

Portal, sign-up, and the first successful call

Sandbox

DeveloperPortal

GettingStarted

SignUp

Login

Documentation 2

Reference material describing how the API behaves

Documentation

Documentation

APIReference

APIReference

Agent Surfaces 5

MCP servers, agent skills, and machine-readable catalogs

WellKnown

AgenticAccess

MCPServer

AgentSkill

LLMsTxt

Design & Contract 7

Pagination, idempotency, versioning, errors, and events

Idempotency

ErrorCatalog

Conventions

Lifecycle

Conformance

DataModel

Webhooks

Scroll for all 7

Build 5

SDKs, sample code, and the tooling you integrate with

ToolCrosswalk

Packages

SDKs

CLI

GitHubOrganization

GitHubOrganization

Access & Security 3

Authentication, authorization, and security posture

OAuthScopes

OAuthScopes

DomainSecurity

DomainSecurity

Authentication

Authentication

Operate 4

Status, limits, changes, and where to get help

RateLimits

Deprecation

ChangeLog

Support

Commercial 4

Pricing, plans, and the legal terms of use

Plans

Pricing

TermsOfService

PrivacyPolicy

Company 2

The organization behind the API

Blog

Blog

Website

Website

Other 3

Properties that don't map to a standard resource type

Overlay

Overlay

AgentCard

AgentCard

Interchange

Interchange

Source (apis.yml)

aid: scope3
name: Scope3
description: 'Scope3 is the source of truth for greenhouse-gas emissions data in media and advertising, and operates Scope3
  Interchange, an agentic advertising platform where buyer agents and seller storefronts transact on the open Ad Context Protocol
  (AdCP). Its APIs let buyers, publishers and platforms measure the carbon footprint of every ad impression and creative across
  channels, benchmark against country/channel percentiles, and run AI-driven programmatic advertising end to end. Scope3 publishes
  four OpenAPI documents across three surfaces: the Carbon Calculator (Measurement) API at api.scope3.com/v2, the AI Impact
  Measurement API at aiapi.scope3.com (energy, gCO2e and water per inference), and the Interchange Buyer and Storefront v2
  APIs at api.interchange.io with 481 operations between them. Interchange is built for AI agents as primary callers: hosted
  remote MCP endpoints with OAuth (RFC 8414 metadata, dynamic client registration, PKCE), an A2A agent card, three published
  Agent Skills, a documented error envelope, IETF draft-7 rate-limit headers and a published IU pricing model. Backed by GV.'
url: https://raw.githubusercontent.com/api-evangelist/scope3/refs/heads/main/apis.yml
accessModel:
  pricing: unknown
  onboarding: self-serve
  trial: false
  try_now: false
  public: false
  label: Self-serve signup
  confidence: medium
  source:
  - authentication
  generated: '2026-07-22'
  method: derived
image: https://scope3.com/og-default.png
x-type: company
x-source: vc-portfolio
x-backed-by:
- gv
x-tier: stub
x-tier-reason: portfolio-lead
specificationVersion: '0.20'
created: '2026-07-17'
modified: '2026-08-13'
tags:
- Company
- Enterprise
- Advertising
- Carbon Emissions
- Sustainability
- AdTech
- Measurement
- Artificial Intelligence
- Agentic
- AdCP
- MCP
- Programmatic
- Media Buying
- Publishing
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com
- FN: APIs.json
  email: info@apis.io
apis:
- aid: scope3:scope3-interchange-buyer-api
  name: Scope3 Interchange Buyer API
  description: 'The buyer side of Scope3 Interchange, the Interchange for agent-to-agent advertising: 212 published operations
    covering advertisers, campaigns, product discovery, creatives, media buys, measurement, syndication, webhook subscriptions
    and buyer billing. Built for AI agents as primary callers — the same surface is reachable over REST or through a hosted
    remote MCP endpoint, and Scope3 publishes an Agent Skill for it.'
  humanURL: https://docs.interchange.io/v2/buyer-introduction
  baseURL: https://api.interchange.io/api/v2/buyer
  tags:
  - Agentic
  - Advertising
  - AdTech
  - AdCP
  - MCP
  properties:
  - type: OpenAPI
    url: openapi/_original/scope3-buyer-openapi-original.yml
  - type: Overlay
    url: overlays/scope3-buyer-overlay.yaml
  - type: MCPServer
    url: mcp/scope3-mcp.yml
  - type: ToolCrosswalk
    url: mcp/scope3-tool-crosswalk.yml
  - type: AgentSkill
    url: skills/scope3-agentic-buyer.md
  - type: Webhooks
    url: asyncapi/scope3-webhooks.yml
  - type: APIReference
    url: https://docs.interchange.io/v2/buyer-api-reference
- aid: scope3:scope3-interchange-storefront-api
  name: Scope3 Interchange Storefront API
  description: 'The seller side of Scope3 Interchange: 269 published operations covering storefronts, inventory sources, ad-server
    catalog and buyer routing, signals, proposals, approvals, storefront agents and payouts. Publishers register once to reach
    every buyer agent transacting on AdCP, over REST or a hosted remote MCP endpoint.'
  humanURL: https://docs.interchange.io/v2/storefront-introduction
  baseURL: https://api.interchange.io/api/v2/storefront
  tags:
  - Agentic
  - Advertising
  - AdTech
  - AdCP
  - MCP
  properties:
  - type: OpenAPI
    url: openapi/_original/scope3-storefront-openapi-original.yml
  - type: Overlay
    url: overlays/scope3-storefront-overlay.yaml
  - type: MCPServer
    url: mcp/scope3-mcp.yml
  - type: ToolCrosswalk
    url: mcp/scope3-tool-crosswalk.yml
  - type: AgentSkill
    url: skills/scope3-agentic-storefront.md
  - type: APIReference
    url: https://docs.interchange.io/v2/storefront-api-reference
- aid: scope3:scope3-ai-impact-measurement-api
  name: Scope3 AI Impact Measurement API
  description: The AI Impact Measurement API from Scope3 — 1 operation(s) for ai impact measurement.
  humanURL: https://docs.scope3.com/reference/measure-1
  baseURL: https://aiapi.scope3.com
  tags:
  - AI Impact Measurement
  properties:
  - type: OpenAPI
    url: openapi/scope3-ai-impact-measurement-api-openapi.yml
- aid: scope3:scope3-benchmarks-api
  name: Scope3 Benchmarks API
  description: The Benchmarks API from Scope3 — 1 operation(s) for benchmarks.
  humanURL: https://docs.scope3.com/reference/measure-1
  baseURL: https://api.scope3.com/v2
  tags:
  - Benchmarks
  properties:
  - type: OpenAPI
    url: openapi/scope3-benchmarks-api-openapi.yml
- aid: scope3:scope3-creative-api
  name: Scope3 Creative API
  description: The Creative API from Scope3 — 1 operation(s) for creative.
  humanURL: https://docs.scope3.com/reference/measure-1
  baseURL: https://api.scope3.com/v2
  tags:
  - Creative
  properties:
  - type: OpenAPI
    url: openapi/scope3-creative-api-openapi.yml
- aid: scope3:scope3-data-api
  name: Scope3 Data API
  description: The Data API from Scope3 — 2 operation(s) for data.
  humanURL: https://docs.scope3.com/reference/measure-1
  baseURL: https://api.scope3.com/v2
  tags:
  - Data
  properties:
  - type: OpenAPI
    url: openapi/scope3-data-api-openapi.yml
- aid: scope3:scope3-gpu-api
  name: Scope3 Gpu API
  description: The Gpu API from Scope3 — 2 operation(s) for gpu.
  humanURL: https://docs.scope3.com/reference/measure-1
  baseURL: https://aiapi.scope3.com
  tags:
  - Gpu
  properties:
  - type: OpenAPI
    url: openapi/scope3-gpu-api-openapi.yml
- aid: scope3:scope3-impact-api
  name: Scope3 Impact API
  description: The Impact API from Scope3 — 1 operation(s) for impact.
  humanURL: https://docs.scope3.com/reference/measure-1
  baseURL: https://aiapi.scope3.com
  tags:
  - Impact
  properties:
  - type: OpenAPI
    url: openapi/scope3-impact-api-openapi.yml
- aid: scope3:scope3-measure-api
  name: Scope3 Measure API
  description: The Measure API from Scope3 — 1 operation(s) for measure.
  humanURL: https://docs.scope3.com/reference/measure-1
  baseURL: https://api.scope3.com/v2
  tags:
  - Measure
  properties:
  - type: OpenAPI
    url: openapi/scope3-measure-api-openapi.yml
- aid: scope3:scope3-model-api
  name: Scope3 Model API
  description: The Model API from Scope3 — 4 operation(s) for model.
  humanURL: https://docs.scope3.com/reference/measure-1
  baseURL: https://aiapi.scope3.com
  tags:
  - Model
  properties:
  - type: OpenAPI
    url: openapi/scope3-model-api-openapi.yml
- aid: scope3:scope3-node-api
  name: Scope3 Node API
  description: The Node API from Scope3 — 2 operation(s) for node.
  humanURL: https://docs.scope3.com/reference/measure-1
  baseURL: https://aiapi.scope3.com
  tags:
  - Node
  properties:
  - type: OpenAPI
    url: openapi/scope3-node-api-openapi.yml
- aid: scope3:scope3-reload-api
  name: Scope3 Reload API
  description: The Reload API from Scope3 — 1 operation(s) for reload.
  humanURL: https://docs.scope3.com/reference/measure-1
  baseURL: https://aiapi.scope3.com
  tags:
  - Reload
  properties:
  - type: OpenAPI
    url: openapi/scope3-reload-api-openapi.yml
- aid: scope3:scope3-saved-lists-api
  name: Scope3 Saved Lists API
  description: The Saved Lists API from Scope3 — 1 operation(s) for saved lists.
  humanURL: https://docs.scope3.com/reference/measure-1
  baseURL: https://api.scope3.com/v2
  tags:
  - Saved Lists
  properties:
  - type: OpenAPI
    url: openapi/scope3-saved-lists-api-openapi.yml
- aid: scope3:scope3-segment-api
  name: Scope3 Segment API
  description: The Segment API from Scope3 — 2 operation(s) for segment.
  humanURL: https://docs.scope3.com/reference/measure-1
  baseURL: https://api.scope3.com/v2
  tags:
  - Segment
  properties:
  - type: OpenAPI
    url: openapi/scope3-segment-api-openapi.yml
- aid: scope3:scope3-signals-api
  name: Scope3 Signals API
  description: The Signals API from Scope3 — 1 operation(s) for signals.
  humanURL: https://docs.scope3.com/reference/measure-1
  baseURL: https://api.scope3.com/v2
  tags:
  - Signals
  properties:
  - type: OpenAPI
    url: openapi/scope3-signals-api-openapi.yml
- aid: scope3:scope3-status-api
  name: Scope3 Status API
  description: The Status API from Scope3 — 1 operation(s) for status.
  humanURL: https://docs.scope3.com/reference/measure-1
  baseURL: https://aiapi.scope3.com
  tags:
  - Status
  properties:
  - type: OpenAPI
    url: openapi/scope3-status-api-openapi.yml
common:
- type: Overlay
  url: overlays/scope3-ai-overlay.yaml
- type: AgentCard
  url: a2a/scope3-a2a.yml
- type: WellKnown
  url: well-known/scope3-well-known.yml
- type: ToolCrosswalk
  url: mcp/scope3-tool-crosswalk.yml
- type: Idempotency
  url: conventions/scope3-conventions.yml
- type: OAuthScopes
  url: scopes/scope3-scopes.yml
- type: Plans
  url: plans/scope3-plans-pricing.yml
- type: RateLimits
  url: rate-limits/scope3-rate-limits.yml
- type: AgenticAccess
  url: agentic-access/scope3-agentic-access.yml
- type: DomainSecurity
  url: security/scope3-domain-security.yml
- type: Authentication
  url: authentication/scope3-authentication.yml
- type: Packages
  url: packages/scope3-packages.yml
- type: SDKs
  url: packages/scope3-packages.yml
- type: CLI
  url: cli/scope3-cli.yml
- type: MCPServer
  url: mcp/scope3-mcp.yml
- type: AgentSkill
  url: skills/_index.yml
- type: LLMsTxt
  url: llms/scope3-llms.txt
- type: ErrorCatalog
  url: errors/scope3-problem-types.yml
- type: Conventions
  url: conventions/scope3-conventions.yml
- type: Lifecycle
  url: lifecycle/scope3-lifecycle.yml
- type: Deprecation
  url: lifecycle/scope3-lifecycle.yml
- type: ChangeLog
  url: changelog/scope3-changelog.yml
- type: Conformance
  url: conformance/scope3-conformance.yml
- type: DataModel
  url: data-model/scope3-data-model.yml
- type: Sandbox
  url: sandbox/scope3-sandbox.yml
- type: Webhooks
  url: asyncapi/scope3-webhooks.yml
- type: DeveloperPortal
  url: https://docs.scope3.com
- type: Documentation
  url: https://docs.scope3.com/docs
- type: APIReference
  url: https://docs.scope3.com/reference/measure-1
- type: GettingStarted
  url: https://docs.scope3.com/docs/getting-started
- type: Support
  url: https://scope3.com/support
- type: Blog
  url: https://scope3.com/blog/
- type: GitHubOrganization
  url: https://github.com/scope3data
- type: Pricing
  url: https://docs.interchange.io/v2/buyer/billing/how-iu-billing-works
- type: SignUp
  url: https://interchange.io/signup
- type: Login
  url: https://interchange.io/login
- type: TermsOfService
  url: https://scope3.com/terms-and-conditions
- type: PrivacyPolicy
  url: https://scope3.com/privacy-policy
- type: Website
  url: https://scope3.com
- type: Interchange
  url: https://interchange.io
  name: Scope3 Interchange
  description: Scope3's agentic advertising platform. Developer portal https://docs.interchange.io, quickstart /v2/quickstart,
    changelog /v2/changelog, llms.txt saved locally at llms/scope3-interchange-llms.txt, platform Agent Skill at skills/scope3-interchange.md.
    The canonical DeveloperPortal / Documentation / APIReference / GettingStarted / ChangeLog / LLMsTxt / AgentSkill pointers
    above already carry one URL each; this entry records the second, newer documentation surface without duplicating those
    types.
x-enrichment:
  date: '2026-08-13'
  status: enriched
  artifacts_added: 16
  pass: local-v1