Neptune.ai

Neptune.ai is an experiment tracker for ML and foundation-model training. As of 2025, Neptune.ai is being acquired by OpenAI and the public pricing page redirects to the OpenAI announcement. Customers continue to use the Neptune Python client and REST API during the transition.

Neptune.ai publishes 2 APIs on the APIs.io network. Tagged areas include ML, MLOps, Experiment Tracking, Foundation Models, and Acquired.

🌐 Visit website 📡 Source on GitHub

15.4/100 emerging ▬ flat Agent 3/100 human only Full breakdown ↓
scored 2026-08-05 · rubric v0.9.1

2 APIs

MLMLOpsExperiment TrackingFoundation ModelsAcquired

Kin Score

Kin Score How this is scored →
scored 2026-08-05 · rubric v0.9.1

Composite quality — 15.4/100 · emerging

Contract Quality 0.0 / 25

Developer Ergonomics 0.0 / 20

Commercial Clarity 5.8 / 20

Operational Transparency 2.7 / 13

Governance 0.0 / 12

Discoverability 6.9 / 10

Agent readiness — 3/100 · human only

Machine-Readable Contract 0 / 18

Agentic Access Contract 0 / 10

MCP Server 0 / 12

Machine-Readable Auth 0 / 10

Idempotency 0 / 9

Stable Error Semantics 0 / 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

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APIs 2

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

Neptune.ai REST API

The Neptune REST API backs the Neptune Python client. It exposes runs, projects, fields, and metadata logging. Authentication uses an API token from the user profile.

Neptune Scale API (foundation-model tier)

Neptune Scale is the higher-throughput logging surface designed for foundation model training jobs. Same API-token authentication; SDK support in `neptune-scale`.

Pricing Plans 1

Published pricing tiers and plan structures.

Neptune Ai Plans Pricing

1 plans

PLANS

Rate Limits 1

Documented rate limits and quota policies.

Neptune Ai Rate Limits

1 limits

RATE LIMITS

FinOps 1

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

Build 1

SDKs, sample code, and the tooling you integrate with

neptune client

SourceCode

Access & Security 1

Authentication, authorization, and security posture

DomainSecurity

DomainSecurity

Operate 1

Status, limits, changes, and where to get help

RateLimits

RateLimits

Commercial 2

Pricing, plans, and the legal terms of use

Plans

Plans

FinOps

FinOps

Company 2

The organization behind the API

LinkedIn

Website

Website

Other 1

Properties that don't map to a standard resource type

Acquisition

Acquisition

Source (apis.yml)

aid: neptune-ai
url: https://raw.githubusercontent.com/api-evangelist/neptune-ai/refs/heads/main/apis.yml
name: Neptune.ai
kind: company
description: Neptune.ai is an experiment tracker for ML and foundation-model training. As of 2025, Neptune.ai is being acquired
  by OpenAI and the public pricing page redirects to the OpenAI announcement. Customers continue to use the Neptune Python
  client and REST API during the transition.
accessModel:
  pricing: unknown
  onboarding: unknown
  trial: false
  try_now: false
  public: false
  label: Unknown
  confidence: low
  source:
  - plans
  generated: '2026-07-22'
  method: derived
image: https://kinlane-images.s3.amazonaws.com/shared/apis-json/icons/neptune-ai.png
tags:
- ML
- MLOps
- Experiment Tracking
- Foundation Models
- Acquired
created: '2026-05-08'
modified: '2026-05-08'
specificationVersion: '0.19'
apis:
- aid: neptune-ai:neptune-rest-api
  name: Neptune.ai REST API
  humanURL: https://docs-legacy.neptune.ai/api/api_reference/
  baseURL: https://app.neptune.ai/api
  tags:
  - REST
  - Runs
  - Projects
  - Metrics
  description: The Neptune REST API backs the Neptune Python client. It exposes runs, projects, fields, and metadata logging.
    Authentication uses an API token from the user profile.
  properties:
  - type: Documentation
    url: https://docs-legacy.neptune.ai/api/api_reference/
  - type: SDKs
    title: Python (neptune)
    url: https://docs-legacy.neptune.ai/api/neptune/
- aid: neptune-ai:neptune-scale-api
  name: Neptune Scale API (foundation-model tier)
  humanURL: https://neptune.ai/docs
  baseURL: https://api.neptune.ai
  tags:
  - REST
  - Foundation Models
  - Scale
  description: Neptune Scale is the higher-throughput logging surface designed for foundation model training jobs. Same API-token
    authentication; SDK support in `neptune-scale`.
  properties:
  - type: Documentation
    url: https://neptune.ai/docs
common:
- type: DomainSecurity
  url: security/neptune-ai-domain-security.yml
- type: LinkedIn
  url: https://www.linkedin.com/company/neptuneai
- type: Website
  url: https://neptune.ai/
- type: Acquisition
  url: https://openai.com/index/openai-to-acquire-neptune/
- type: SourceCode
  title: neptune client
  url: https://github.com/neptune-ai/neptune-client
- type: Plans
  url: plans/neptune-ai-plans-pricing.yml
- type: RateLimits
  url: rate-limits/neptune-ai-rate-limits.yml
- type: FinOps
  url: finops/neptune-ai-finops.yml
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com