Figure Eight

Figure Eight (formerly CrowdFlower, and originally Dolores Labs) was a human-in-the-loop machine learning and artificial intelligence company founded in San Francisco in 2007 by Lukas Biewald and Chris Van Pelt. Its platform turned unlabeled text, image, audio, and video into high-quality AI training data by combining automation with a distributed contributor workforce. The company exposed a RESTful, key-authenticated JSON API for programmatically creating, configuring, launching, and monitoring annotation jobs and multi-step workflows, and for downloading aggregated judgments and reports. Figure Eight was acquired by Appen in March 2019 for up to $300M; by 2020 its assets were fully integrated into Appen and the API is now served as the Appen Platform API at api.appen.com. This profile captures that surviving API surface. figure-eight.com now redirects to appen.com.

Figure Eight publishes 13 APIs on the APIs.io network, including Account Info API, Job Create/Update API, Job Ontology API, and 10 more. Tagged areas include Company, Ai, Machine Learning, Data Labeling, and Data Annotation.

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

Figure Eight’s developer surface includes API reference, documentation, authentication, and 12 more developer resources.

🌐 Visit website 📡 Source on GitHub

33.9/100 thin ▬ flat Agent 56/100 agent ready Full breakdown ↓
scored 2026-07-27 · rubric v0.5

AccessSelf serve

13 APIs 1 MCP Servers

CompanyAiMachine LearningData LabelingData AnnotationTraining DataHuman-in-the-LoopCrowdsourcingAcquired

Kin Score

Kin Score How this is scored →
scored 2026-07-27 · rubric v0.5

Composite quality — 33.9/100 · thin

Contract Quality 15.0 / 25

Developer Ergonomics 8.3 / 20

Commercial Clarity 0.0 / 20

Operational Transparency 0.7 / 13

Governance 0.0 / 12

Discoverability 10.0 / 10

Agent readiness — 56/100 · agent ready

Machine-Readable Contract 18 / 18

Agentic Access Contract 0 / 15

MCP Server 12 / 12

Machine-Readable Auth 10 / 10

Idempotency 0 / 9

Stable Error Semantics 8 / 8

Request/Response Examples 0 / 7

Rate-Limit Signaling 0 / 7

Typed Event Surface 6 / 6

Agent Skills 0 / 5

Well-Known Catalog 4 / 4

Consent & Bot Identity 0 / 3

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/figure-eight: 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 13

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

MCP Servers 1

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

Documentation 2

Reference material describing how the API behaves

APIReference

APIReference

Documentation

Documentation

Agent Surfaces 3

MCP servers, agent skills, and machine-readable catalogs

MCPServer

MCPServer

LLMsTxt

LLMsTxt

WellKnown

WellKnown

Design & Contract 5

Pagination, idempotency, versioning, errors, and events

Conventions

ErrorCatalog

Lifecycle

Conformance

DataModel

Build 3

SDKs, sample code, and the tooling you integrate with

GitHubOrganization

GitHubOrganization

Packages

Packages

SDKs

SDKs

Access & Security 2

Authentication, authorization, and security posture

DomainSecurity

DomainSecurity

Authentication

Authentication

Source (apis.yml)

aid: figure-eight
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://kinlane-images.s3.amazonaws.com/shared/apis-json/icons/figure-eight.png
name: Figure Eight
description: Figure Eight (formerly CrowdFlower, and originally Dolores Labs) was a human-in-the-loop machine learning and
  artificial intelligence company founded in San Francisco in 2007 by Lukas Biewald and Chris Van Pelt. Its platform turned
  unlabeled text, image, audio, and video into high-quality AI training data by combining automation with a distributed contributor
  workforce. The company exposed a RESTful, key-authenticated JSON API for programmatically creating, configuring, launching,
  and monitoring annotation jobs and multi-step workflows, and for downloading aggregated judgments and reports. Figure Eight
  was acquired by Appen in March 2019 for up to $300M; by 2020 its assets were fully integrated into Appen and the API is
  now served as the Appen Platform API at api.appen.com. This profile captures that surviving API surface. figure-eight.com
  now redirects to appen.com.
url: https://raw.githubusercontent.com/api-evangelist/figure-eight/refs/heads/main/apis.yml
x-type: company
x-source: vc-portfolio
x-backed-by:
- trinity-ventures
x-tier: stub
x-tier-reason: portfolio-lead
x-status: acquired
x-acquired-by: appen
x-acquired-date: 2019-03
specificationVersion: '0.20'
created: '2026-07-17'
modified: '2026-07-19'
tags:
- Company
- Ai
- Machine Learning
- Data Labeling
- Data Annotation
- Training Data
- Human-in-the-Loop
- Crowdsourcing
- Acquired
apis:
- aid: figure-eight:figure-eight-account-info-api
  name: Figure Eight Account Info API
  description: Manage account info.
  humanURL: https://app.swaggerhub.com/apis-docs/CrowdFlower/FigureEightAPI/1.0.0
  baseURL: https://api.appen.com/v1
  tags:
  - Account Info
  properties:
  - type: OpenAPI
    url: openapi/figure-eight-account-info-api-openapi.yml
  - type: Webhooks
    url: asyncapi/figure-eight-webhooks.yml
- aid: figure-eight:figure-eight-job-create-update-api
  name: Figure Eight Job Create/Update API
  description: Create and update jobs.
  humanURL: https://app.swaggerhub.com/apis-docs/CrowdFlower/FigureEightAPI/1.0.0
  baseURL: https://api.appen.com/v1
  tags:
  - Job Create/Update
  properties:
  - type: OpenAPI
    url: openapi/figure-eight-job-create-update-api-openapi.yml
  - type: Webhooks
    url: asyncapi/figure-eight-webhooks.yml
- aid: figure-eight:figure-eight-job-ontology-api
  name: Figure Eight Job Ontology API
  description: Read and Update the Ontology for a job
  humanURL: https://app.swaggerhub.com/apis-docs/CrowdFlower/FigureEightAPI/1.0.0
  baseURL: https://api.appen.com/v1
  tags:
  - Job Ontology
  properties:
  - type: OpenAPI
    url: openapi/figure-eight-job-ontology-api-openapi.yml
  - type: Webhooks
    url: asyncapi/figure-eight-webhooks.yml
- aid: figure-eight:figure-eight-job-results-api
  name: Figure Eight Job Results API
  description: Request rows, judgments, and reports.
  humanURL: https://app.swaggerhub.com/apis-docs/CrowdFlower/FigureEightAPI/1.0.0
  baseURL: https://api.appen.com/v1
  tags:
  - Job Results
  properties:
  - type: OpenAPI
    url: openapi/figure-eight-job-results-api-openapi.yml
  - type: Webhooks
    url: asyncapi/figure-eight-webhooks.yml
- aid: figure-eight:figure-eight-job-status-api
  name: Figure Eight Job Status API
  description: Control job status.
  humanURL: https://app.swaggerhub.com/apis-docs/CrowdFlower/FigureEightAPI/1.0.0
  baseURL: https://api.appen.com/v1
  tags:
  - Job Status
  properties:
  - type: OpenAPI
    url: openapi/figure-eight-job-status-api-openapi.yml
  - type: Webhooks
    url: asyncapi/figure-eight-webhooks.yml
- aid: figure-eight:figure-eight-manage-job-data-api
  name: Figure Eight Manage Job Data API
  description: Load data to jobs and work with that data.
  humanURL: https://app.swaggerhub.com/apis-docs/CrowdFlower/FigureEightAPI/1.0.0
  baseURL: https://api.appen.com/v1
  tags:
  - Manage Job Data
  properties:
  - type: OpenAPI
    url: openapi/figure-eight-manage-job-data-api-openapi.yml
  - type: Webhooks
    url: asyncapi/figure-eight-webhooks.yml
- aid: figure-eight:figure-eight-manage-job-settings-api
  name: Figure Eight Manage Job Settings API
  description: Manage various job settings.
  humanURL: https://app.swaggerhub.com/apis-docs/CrowdFlower/FigureEightAPI/1.0.0
  baseURL: https://api.appen.com/v1
  tags:
  - Manage Job Settings
  properties:
  - type: OpenAPI
    url: openapi/figure-eight-manage-job-settings-api-openapi.yml
  - type: Webhooks
    url: asyncapi/figure-eight-webhooks.yml
- aid: figure-eight:figure-eight-monitor-contributors-api
  name: Figure Eight Monitor Contributors API
  description: Monitor contributor status and settings.
  humanURL: https://app.swaggerhub.com/apis-docs/CrowdFlower/FigureEightAPI/1.0.0
  baseURL: https://api.appen.com/v1
  tags:
  - Monitor Contributors
  properties:
  - type: OpenAPI
    url: openapi/figure-eight-monitor-contributors-api-openapi.yml
  - type: Webhooks
    url: asyncapi/figure-eight-webhooks.yml
- aid: figure-eight:figure-eight-workflow-data-upload-download-api
  name: Figure Eight Workflow Data Upload/Download API
  description: Upload data to run through a Workflow. Download reports.
  humanURL: https://app.swaggerhub.com/apis-docs/CrowdFlower/FigureEightAPI/1.0.0
  baseURL: https://api.appen.com/v1
  tags:
  - Workflow Data Upload/Download
  properties:
  - type: OpenAPI
    url: openapi/figure-eight-workflow-data-upload-download-api-openapi.yml
  - type: Webhooks
    url: asyncapi/figure-eight-webhooks.yml
- aid: figure-eight:figure-eight-workflow-filter-rules-api
  name: Figure Eight Workflow Filter Rules API
  description: Rules for routing data
  humanURL: https://app.swaggerhub.com/apis-docs/CrowdFlower/FigureEightAPI/1.0.0
  baseURL: https://api.appen.com/v1
  tags:
  - Workflow Filter Rules
  properties:
  - type: OpenAPI
    url: openapi/figure-eight-workflow-filter-rules-api-openapi.yml
  - type: Webhooks
    url: asyncapi/figure-eight-webhooks.yml
- aid: figure-eight:figure-eight-workflow-step-routes-api
  name: Figure Eight Workflow Step Routes API
  description: Manage Workflow Step Routes
  humanURL: https://app.swaggerhub.com/apis-docs/CrowdFlower/FigureEightAPI/1.0.0
  baseURL: https://api.appen.com/v1
  tags:
  - Workflow Step Routes
  properties:
  - type: OpenAPI
    url: openapi/figure-eight-workflow-step-routes-api-openapi.yml
  - type: Webhooks
    url: asyncapi/figure-eight-webhooks.yml
- aid: figure-eight:figure-eight-workflow-steps-api
  name: Figure Eight Workflow Steps API
  description: Manage Workflow Steps
  humanURL: https://app.swaggerhub.com/apis-docs/CrowdFlower/FigureEightAPI/1.0.0
  baseURL: https://api.appen.com/v1
  tags:
  - Workflow Steps
  properties:
  - type: OpenAPI
    url: openapi/figure-eight-workflow-steps-api-openapi.yml
  - type: Webhooks
    url: asyncapi/figure-eight-webhooks.yml
- aid: figure-eight:figure-eight-workflows-api
  name: Figure Eight Workflows API
  description: Copy, launch, pause and resume workflows, check status and configuration values
  humanURL: https://app.swaggerhub.com/apis-docs/CrowdFlower/FigureEightAPI/1.0.0
  baseURL: https://api.appen.com/v1
  tags:
  - Workflows
  properties:
  - type: OpenAPI
    url: openapi/figure-eight-workflows-api-openapi.yml
  - type: Webhooks
    url: asyncapi/figure-eight-webhooks.yml
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com
- FN: APIs.json
  email: info@apis.io
common:
- type: DomainSecurity
  url: security/figure-eight-domain-security.yml
- type: APIReference
  url: https://app.swaggerhub.com/apis-docs/CrowdFlower/FigureEightAPI/1.0.0
- type: Documentation
  url: http://crowdflower.github.io/CML/
- type: GitHubOrganization
  url: https://github.com/CrowdFlower
- type: Packages
  url: packages/figure-eight-packages.yml
- type: SDKs
  url: packages/figure-eight-packages.yml
- type: Authentication
  url: authentication/figure-eight-authentication.yml
- type: Conventions
  url: conventions/figure-eight-conventions.yml
- type: ErrorCatalog
  url: errors/figure-eight-problem-types.yml
- type: Lifecycle
  url: lifecycle/figure-eight-lifecycle.yml
- type: Conformance
  url: conformance/figure-eight-conformance.yml
- type: DataModel
  url: data-model/figure-eight-data-model.yml
- type: MCPServer
  url: mcp/figure-eight-mcp.yml
- type: LLMsTxt
  url: llms/figure-eight-llms.txt
- type: WellKnown
  url: well-known/figure-eight-well-known.yml
x-enrichment:
  date: '2026-07-19'
  status: backfilled
  pass: local-v1
  note: backfilled from .gitignore signal + verified work evidence

Figure Eight

Kin Score

APIs 13

Figure Eight Account Info API

Figure Eight Job Create/Update API

Figure Eight Job Ontology API

Figure Eight Job Results API

Figure Eight Job Status API

Figure Eight Manage Job Data API

Figure Eight Manage Job Settings API

Figure Eight Monitor Contributors API

Figure Eight Workflow Data Upload/Download API

Figure Eight Workflow Filter Rules API

Figure Eight Workflow Step Routes API

Figure Eight Workflow Steps API

Figure Eight Workflows API

MCP Servers 1

figure-eight-mcp.yml

Event Specifications 1

Figure Eight Webhooks

Security Posture 2

Figure Eight Authentication

Figure Eight Domain Security

Resources