Weights & Biases

Weights & Biases is the ML developer platform for experiment tracking, model registry, artifact management, sweeps, reports, and (Weave) GenAI evaluation. The W&B API is primarily a GraphQL endpoint, surfaced through a Python `wandb.Api` SDK.

Weights & Biases publishes 9 APIs on the APIs.io network, including Calls API, Costs API, Feedback API, and 6 more. Tagged areas include ML, MLOps, Experiment Tracking, Model Registry, and GenAI.

Weights & Biases’ developer surface includes authentication, developer portal, pricing, and 9 more developer resources.

🌐 Visit website 📡 Source on GitHub

30.5/100 thin ▬ flat Agent 36/100 agent ready Full breakdown ↓
scored 2026-08-20 · rubric v0.12.0

AccessSelf serve

11 APIs

ML MLOps Experiment Tracking Model Registry GenAI

Kin Score

Kin Score How this is scored →
scored 2026-08-20 · rubric v0.12.0

Composite quality — 30.5/100 · thin

Contract Quality 13.4 / 25

Developer Ergonomics 4.3 / 20

Access Clarity 4.7 / 20

Operational Transparency 0.7 / 13

Contract Governance 0.0 / 12

Discoverability 7.4 / 10

Agent readiness — 36/100 · agent ready

Machine-Readable Contract 18 / 18

Agentic Access Contract 10 / 10

Documented Reversibility 0 / 6

MCP Server 0 / 12

Machine-Readable Auth 10 / 10

Idempotency 0 / 9

Stable Error Semantics 8 / 8

Request/Response Examples 0 / 7

Rate-Limit Signaling 7 / 7

Typed Event Surface 0 / 6

Agent Skills 0 / 5

Well-Known Catalog 0 / 4

Consent & Bot Identity 0 / 3

A2A Agent Card 0 / 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/weights-and-biases: 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 11

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

Open Collections 11

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

GraphQL 1

GraphQL schemas published by this provider.

Rate Limits 1

Documented rate limits and quota policies.

Weights And Biases Rate Limits

1 limits

RATE LIMITS

FinOps 1

Cost, billing, and metering signals for API financial operations.

Get Started 1

Portal, sign-up, and the first successful call

Portal

Portal

Agent Surfaces 1

MCP servers, agent skills, and machine-readable catalogs

AgenticAccess

AgenticAccess

Build 1

SDKs, sample code, and the tooling you integrate with

wandb client

SourceCode

Access & Security 3

Authentication, authorization, and security posture

VulnerabilityDisclosure

VulnerabilityDisclosure

DomainSecurity

DomainSecurity

Authentication

Authentication

Operate 1

Status, limits, changes, and where to get help

RateLimits

RateLimits

Commercial 4

Pricing, plans, and the legal terms of use

License

Pricing

Plans

FinOps

Company 1

The organization behind the API

Website

Website

Source (apis.yml)

aid: weights-and-biases
url: https://raw.githubusercontent.com/api-evangelist/weights-and-biases/refs/heads/main/apis.yml
name: Weights & Biases
kind: company
description: Weights & Biases is the ML developer platform for experiment tracking, model registry, artifact management, sweeps,
  reports, and (Weave) GenAI evaluation. The W&B API is primarily a GraphQL endpoint, surfaced through a Python `wandb.Api`
  SDK.
accessModel:
  pricing: unknown
  onboarding: self-serve
  trial: false
  try_now: false
  public: false
  label: Self-serve signup
  confidence: high
  source:
  - plans
  - authentication
  generated: '2026-07-22'
  method: derived
image: https://kinlane-images.s3.amazonaws.com/shared/apis-json/icons/weights-and-biases.png
tags:
- ML
- MLOps
- Experiment Tracking
- Model Registry
- GenAI
created: '2026-05-08'
modified: '2026-05-08'
specificationVersion: '0.23'
apis:
- aid: weights-and-biases:wandb-graphql-api
  name: W&B GraphQL API
  humanURL: https://docs.wandb.ai/ref/python/public-api/api/
  baseURL: https://api.wandb.ai/graphql
  tags:
  - GraphQL
  - Experiments
  - Runs
  - Artifacts
  - Sweeps
  description: The W&B Public API is a GraphQL endpoint at `https://api.wandb.ai/graphql`. It backs the Python `wandb.Api()`
    SDK and exposes runs, projects, sweeps, artifacts, reports, registries, and automations. Authentication is via API key.
  properties:
  - type: Documentation
    url: https://docs.wandb.ai/ref/python/public-api/api/
  - type: Authentication
    url: https://docs.wandb.ai/guides/track/public-api-guide
  - type: SDKs
    title: Python (wandb)
    url: https://docs.wandb.ai/ref/python/
  - url: graphql/weights-and-biases-graphql.md
    type: GraphQL
- aid: weights-and-biases:wandb-import-api
  name: W&B Import API (HTTP)
  humanURL: https://docs.wandb.ai/guides/track/log/
  baseURL: https://api.wandb.ai/files
  tags:
  - HTTP
  - Logging
  - Ingestion
  description: The wandb client uses an HTTP file/import endpoint to push run metrics, system stats, and artifacts. Generally
    accessed through the SDK rather than directly.
  properties:
  - type: Documentation
    url: https://docs.wandb.ai/guides/track/log/
- aid: weights-and-biases:weights-and-biases-calls-api
  name: Weights & Biases Calls API
  description: The Calls API from Weights & Biases — 8 operation(s) for calls.
  humanURL: https://docs.wandb.ai/ref/python/public-api/api/
  baseURL: https://api.wandb.ai/graphql
  tags:
  - Calls
  properties:
  - type: OpenAPI
    url: openapi/weights-and-biases-calls-api-openapi.yml
- aid: weights-and-biases:weights-and-biases-costs-api
  name: Weights & Biases Costs API
  description: The Costs API from Weights & Biases — 3 operation(s) for costs.
  humanURL: https://docs.wandb.ai/ref/python/public-api/api/
  baseURL: https://api.wandb.ai/graphql
  tags:
  - Costs
  properties:
  - type: OpenAPI
    url: openapi/weights-and-biases-costs-api-openapi.yml
- aid: weights-and-biases:weights-and-biases-feedback-api
  name: Weights & Biases Feedback API
  description: The Feedback API from Weights & Biases — 4 operation(s) for feedback.
  humanURL: https://docs.wandb.ai/ref/python/public-api/api/
  baseURL: https://api.wandb.ai/graphql
  tags:
  - Feedback
  properties:
  - type: OpenAPI
    url: openapi/weights-and-biases-feedback-api-openapi.yml
- aid: weights-and-biases:weights-and-biases-files-api
  name: Weights & Biases Files API
  description: The Files API from Weights & Biases — 2 operation(s) for files.
  humanURL: https://docs.wandb.ai/ref/python/public-api/api/
  baseURL: https://api.wandb.ai/graphql
  tags:
  - File
  tags_raw:
  - Files
  properties:
  - type: OpenAPI
    url: openapi/weights-and-biases-files-api-openapi.yml
- aid: weights-and-biases:weights-and-biases-objects-api
  name: Weights & Biases Objects API
  description: The Objects API from Weights & Biases — 4 operation(s) for objects.
  humanURL: https://docs.wandb.ai/ref/python/public-api/api/
  baseURL: https://api.wandb.ai/graphql
  tags:
  - Objects
  properties:
  - type: OpenAPI
    url: openapi/weights-and-biases-objects-api-openapi.yml
- aid: weights-and-biases:weights-and-biases-refs-api
  name: Weights & Biases Refs API
  description: The Refs API from Weights & Biases — 1 operation(s) for refs.
  humanURL: https://docs.wandb.ai/ref/python/public-api/api/
  baseURL: https://api.wandb.ai/graphql
  tags:
  - Refs
  properties:
  - type: OpenAPI
    url: openapi/weights-and-biases-refs-api-openapi.yml
- aid: weights-and-biases:weights-and-biases-service-api
  name: Weights & Biases Service API
  description: The Service API from Weights & Biases — 2 operation(s) for service.
  humanURL: https://docs.wandb.ai/ref/python/public-api/api/
  baseURL: https://api.wandb.ai/graphql
  tags:
  - Service
  properties:
  - type: OpenAPI
    url: openapi/weights-and-biases-service-api-openapi.yml
- aid: weights-and-biases:weights-and-biases-table-api
  name: Weights & Biases Table API
  description: The Table API from Weights & Biases — 1 operation(s) for table.
  humanURL: https://docs.wandb.ai/ref/python/public-api/api/
  baseURL: https://api.wandb.ai/graphql
  tags:
  - Table
  properties:
  - type: OpenAPI
    url: openapi/weights-and-biases-table-api-openapi.yml
- aid: weights-and-biases:weights-and-biases-tables-api
  name: Weights & Biases Tables API
  description: The Tables API from Weights & Biases — 4 operation(s) for tables.
  humanURL: https://docs.wandb.ai/ref/python/public-api/api/
  baseURL: https://api.wandb.ai/graphql
  tags:
  - Tables
  properties:
  - type: OpenAPI
    url: openapi/weights-and-biases-tables-api-openapi.yml
common:
- type: License
  name: MIT
  url: https://github.com/wandb/wandb/blob/main/LICENSE
- type: AgenticAccess
  url: agentic-access/weights-and-biases-agentic-access.yml
- type: VulnerabilityDisclosure
  url: security/weights-and-biases-vulnerability-disclosure.yml
- type: DomainSecurity
  url: security/weights-and-biases-domain-security.yml
- type: Authentication
  url: authentication/weights-and-biases-authentication.yml
- type: Website
  url: https://wandb.ai/
- type: Portal
  url: https://docs.wandb.ai/
- type: Pricing
  url: https://wandb.ai/site/pricing
- type: SourceCode
  title: wandb client
  url: https://github.com/wandb/wandb
- type: Plans
  url: plans/weights-and-biases-plans-pricing.yml
- type: RateLimits
  url: rate-limits/weights-and-biases-rate-limits.yml
- type: FinOps
  url: finops/weights-and-biases-finops.yml
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com