Asterlab

Aster (Aster AI Labs, PBC), operating as Asterlab, is a San Francisco based Y Combinator (Spring 2026) public benefit corporation building autonomous research systems that coordinate thousands of AI research agents working in parallel to automate open-ended scientific discovery. The company used that same autonomous-research system to optimize its own inference stack and now offers Aster Inference, an OpenAI-compatible inference API serving open-weight models (gpt-oss-120b, gpt-oss-120b-fast, and Z.ai's GLM 5.2) at what it benchmarks as the fastest gpt-oss-120b output speed on GPU (644 tok/s). The API works with the official OpenAI Python and JS SDKs, LangChain, LiteLLM, Cursor, the Vercel AI SDK, and most agent frameworks by pointing the base URL at https://api.asterlab.ai/v1, with zero data retention by default.

Asterlab publishes 1 API on the APIs.io network. Tagged areas include Company, Artificial Intelligence, Machine-Learning, LLM, and Inference.

Asterlab’s developer surface includes documentation, getting-started guide, pricing, signup flow, engineering blog, support, authentication, and 8 more developer resources.

🌐 Visit website 📡 Source on GitHub

26.5/100 thin ▬ flat Agent 3/100 human only saas Full breakdown ↓
scored 2026-09-08 · rubric v0.20.0

1 APIs

Company Artificial Intelligence Machine-Learning LLM Inference OpenAI-CompatibleAutonomous ResearchGPU Developer Tools

Kin Score

Kin Score How this is scored →
scored 2026-09-08 · rubric v0.20.0

Composite quality — 26.5/100 · thin

Contract Quality 0.0 / 25

Developer Ergonomics 10.0 / 20

Access Clarity 8.9 / 20

Operational Transparency 0.0 / 13

Contract Governance 0.0 / 12

Discoverability 7.6 / 10

Agent readiness — 3/100 · human only

Machine-Readable Contract 0 / 18

Agentic Access Contract 0 / 10

Documented Reversibility 0 / 6

MCP Server 0 / 12

Machine-Readable Auth 10 / 10

Idempotency 0 / 9

Stable Error Semantics 0 / 8

Request/Response Examples 0 / 7

Rate-Limit Signaling 0 / 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

Delegated User Identity 0 / 6

Protected Resource Metadata 0 / 5

Registration Without a Human 0 / 6

Agentic Commerce Well-Known Document 0 / 5

Create-or-Update Ergonomics could not be measured. We hold no machine-readable contract for this provider to read, so there is nothing to measure a write surface against. Excluded rather than scored zero: never-measured and measured-empty are different facts. Publishing an OpenAPI is what makes this facet — and several others — scorable at all.

Improve this rating by publishing the missing artifacts — every area above can be raised, and the full rubric is at apis.io/rating/. Every facet and dimension name above is a link: it opens that measurement's own page — what it means, the exact checks that feed it, how the whole catalog distributes on it, and the providers at the top of it. This rating is computed from github.com/api-evangelist/asterlab: open an issue to ask a question, or submit a pull request to add artifacts. Submit an artifact on GitHub — free → Manage your own listing — the Influence plan, $499/mo →

APIs 1

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

Aster Inference API

OpenAI-compatible inference API from Aster serving open-weight models (gpt-oss-120b, gpt-oss-120b-fast, GLM 5.2). Authenticate with an Aster API key created in the inference con...

Security Posture 2

Authentication, domain security, vulnerability disclosure, and trust-center signals.

Asterlab Authentication

http · 1 scheme

SECURITY

Asterlab Domain Security

TLSv1.3 · HSTS

SECURITY

Resources

Get Started 3

Portal, sign-up, and the first successful call

DeveloperPortal

DeveloperPortal

GettingStarted

GettingStarted

SignUp

SignUp

Documentation 1

Reference material describing how the API behaves

Documentation

Documentation

Agent Surfaces 2

MCP servers, agent skills, and machine-readable catalogs

WellKnown

WellKnown

LLMsTxt

LLMsTxt

Design & Contract 1

Pagination, idempotency, versioning, errors, and events

Conventions

Conventions

Access & Security 2

Authentication, authorization, and security posture

Authentication

Authentication

DomainSecurity

DomainSecurity

Operate 1

Status, limits, changes, and where to get help

Support

Support

Commercial 3

Pricing, plans, and the legal terms of use

Pricing

Pricing

TermsOfService

TermsOfService

PrivacyPolicy

PrivacyPolicy

Company 2

The organization behind the API

Website

Website

Blog

Blog

Source (apis.yml)

aid: asterlab
name: Asterlab
description: Aster (Aster AI Labs, PBC), operating as Asterlab, is a San Francisco based Y Combinator (Spring 2026) public
  benefit corporation building autonomous research systems that coordinate thousands of AI research agents working in parallel
  to automate open-ended scientific discovery. The company used that same autonomous-research system to optimize its own inference
  stack and now offers Aster Inference, an OpenAI-compatible inference API serving open-weight models (gpt-oss-120b, gpt-oss-120b-fast,
  and Z.ai's GLM 5.2) at what it benchmarks as the fastest gpt-oss-120b output speed on GPU (644 tok/s). The API works with
  the official OpenAI Python and JS SDKs, LangChain, LiteLLM, Cursor, the Vercel AI SDK, and most agent frameworks by pointing
  the base URL at https://api.asterlab.ai/v1, with zero data retention by default.
deliveryModel:
  model: saas
  open_source: false
  commercial: true
  callable_host: false
  label: Hosted service · you call their endpoint
  confidence: medium
  source:
  - pricing
  generated: '2026-08-28'
  method: derived
accessModel:
  pricing: unknown
  onboarding: unknown
  trial: false
  try_now: false
  public: false
  label: Unknown
  confidence: low
  source:
  - authentication
  - security
  generated: '2026-09-03'
  method: derived
image: https://www.asterlab.ai/og/default.png
url: https://raw.githubusercontent.com/api-evangelist/asterlab/refs/heads/main/apis.yml
x-type: company
x-source: vc-portfolio
x-backed-by:
- y-combinator
x-tier: stub
x-tier-reason: portfolio-lead
specificationVersion: '0.23'
created: '2026-07-17'
modified: '2026-07-18'
tags:
- Company
- Artificial Intelligence
- Machine-Learning
- LLM
- Inference
- OpenAI-Compatible
- Autonomous Research
- GPU
- Developer Tools
tags_raw:
- Company
- Artificial Intelligence
- Machine Learning
- LLM
- Inference
- OpenAI Compatible
- Autonomous Research
- GPU
- Developer Tools
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com
- FN: APIs.json
  email: info@apis.io
apis:
- name: Aster Inference API
  description: OpenAI-compatible inference API from Aster serving open-weight models (gpt-oss-120b, gpt-oss-120b-fast, GLM
    5.2). Authenticate with an Aster API key created in the inference console and set the base URL to https://api.asterlab.ai/v1;
    works with the OpenAI SDKs, LangChain, LiteLLM, and most agent frameworks. Zero data retention by default.
  humanURL: https://www.asterlab.ai/inference
  baseURL: https://api.asterlab.ai/v1
  tags:
  - Inference
  - LLM
  - OpenAI-Compatible
  tags_raw:
  - Inference
  - LLM
  - OpenAI Compatible
  properties:
  - type: Authentication
    url: authentication/asterlab-authentication.yml
  - type: Conventions
    url: conventions/asterlab-conventions.yml
common:
- type: Website
  url: https://www.asterlab.ai/
- type: DeveloperPortal
  url: https://www.asterlab.ai/inference/console
- type: Documentation
  url: https://www.asterlab.ai/inference
- type: GettingStarted
  url: https://www.asterlab.ai/inference
- type: Pricing
  url: https://www.asterlab.ai/inference
- type: SignUp
  url: https://www.asterlab.ai/inference/console
- type: TermsOfService
  url: https://www.asterlab.ai/terms
- type: PrivacyPolicy
  url: https://www.asterlab.ai/privacy
- type: Blog
  url: https://www.asterlab.ai/research/scaling_autonomous_research_to_thousands_of_agents
- type: Support
  url: mailto:info@asterlab.ai
- type: Authentication
  url: authentication/asterlab-authentication.yml
- type: Conventions
  url: conventions/asterlab-conventions.yml
- type: WellKnown
  url: well-known/asterlab-well-known.yml
- type: LLMsTxt
  url: llms/asterlab-llms.txt
- type: DomainSecurity
  url: security/asterlab-domain-security.yml
x-enrichment:
  date: '2026-07-19'
  status: backfilled
  pass: local-v1
  note: backfilled from .gitignore signal + verified work evidence

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