Martian

Martian operates an LLM model router and gateway that dynamically routes each request to the best underlying model across providers for the optimal balance of quality, latency, and cost. The Martian Gateway exposes a drop-in, OpenAI-compatible REST API (and an Anthropic Messages-compatible surface) so applications can route across a large catalog of models by changing only the base URL.

Martian publishes 3 API contracts indexed on the APIs.io network: Chat Completions API, Messages API, and Models API. Tagged areas include Artificial Intelligence, LLM, Model Router, Gateways, and Cost Optimization.

The Martian catalog on APIs.io includes 1 event-driven AsyncAPI specification and 1 Spectral governance ruleset.

Martian’s developer surface includes authentication, documentation, engineering blog, API reference, getting-started guide, support, signup flow, and 21 more developer resources.

🌐 Visit website 📡 Profile data on GitHub

43.4/100 developing ▬ flat Agent 21/100 agent aware Front door AI 5/6 prominent Heartbeat 55/100 going silent saas Full breakdown ↓
scored 2026-11-13 · rubric v0.28.0 · Show this score on your site →

AccessFreemiumSelf serve⚡ Free to try

1 published contract

Artificial Intelligence LLMModel RouterGateways Cost Optimization

What this lets a business do 1

Business capabilities this provider's published APIs can perform, derived from its own contracts. Browse all capabilities →

AI Model Services

AE-110

Chat CompletionsMessages

POST /v1/chat/completions POST /v1/messages

Kin Score

Kin Score How this is scored →
scored 2026-11-13 · rubric v0.28.0

Composite quality — 43.4/100 · developing

Contract Quality 10.8 / 19

Developer Ergonomics 9.8 / 15

Access Clarity 2.6 / 15

Operational Transparency 2.3 / 10

Contract Governance 2.7 / 9

Discoverability 5.5 / 8

Regulatory Posture 1.5 / 15

Create-or-Update Ergonomics 0.0 / 10

Agent readiness — 21/100 · agent aware

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 6 / 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

Pagination 0 / 5

Distinct Operations 3 / 3

MCP Tool Quality 6 / 6

Regulatory Posture applies to this provider. Its tags matched the Horizontal (data, software, accessibility, platform) regime, so Regulatory Posture carries 15 points of the composite. If this regime is wrong for your business, say so on your provider repo — the applicability map is public and we will correct it.

Create-or-Update Ergonomics applies to this provider. This API accepts writes, so it carries 10 points of the composite. It is scored from the published contracts themselves: whether a caller can create-or-update in one call, whether the write accepts a key the caller already holds, and whether the response says which branch ran. Without that, every write needs a search-and-branch in front of it, and the first time that check is skipped a duplicate record is created. Scored against the observed mean rather than raw — a provider at the catalog average is unchanged by this facet, not penalised by it.

The six quality facets above are damped to 75 points between them, because the conditional facet above carries the other 25. That is why each facet's contribution is shown against a damped maximum: raising a quality facet moves the composite by 75% of its nominal weight, not 100%. The full arithmetic is at apis.io/rating/.

Show this score on your site.

It updates itself when the score changes. Paste this where you link to your API docs:

<a href="https://apis.io/providers/martian-ai/"><img src="https://apis.io/badge/martian-ai/card.svg" alt="Martian on APIs.io — Kin Score by API Evangelist"></a>

Other styles, a README pill and a shields.io endpoint are on the badge page.

Raise your score.

Agent readiness — checks not met, largest first (exact, from this profile):

MCP Server +12 pts — deployment.mode + probe verdict on the mcp/ manifest, not the pointer; an unprobed slug falls back to authorship Ask about this →
Idempotency +9 pts — OpenAPI mutating operations declare an idempotency key — a header, a request-body property, or a named de-duplication token whose own description says so (verified); else common[].type matches /idempoten/i (documented) Ask about this →
A2A Agent Card +8 pts — a2a/-a2a.yml manifest, graded on conformance.grade against A2A 1.0.0 Ask about this →
Request/Response Examples +7 pts — share of operations carrying request/response examples; else an Examples / Code Samples link Ask about this →
Registration Without a Human +6 pts — a `registration_endpoint` in the served RFC 8414 / OIDC discovery document Ask about this →
Delegated User Identity +6 pts — a served discovery document listing authorization_code in grant_types_supported (served), else an oauth2 authorizationCode flow or openIdConnect declared in an OpenAPI (documented) Ask about this →

8 more unmet checks in the Agent Readiness table above.

Kin Score — facets with the most composite points still available (weight × headroom):

Access Clarity scores 17.0 — up to +16.6 composite points Ask about this →
Contract Quality scores 57.6 — up to +10.6 composite points Ask about this →
Operational Transparency scores 23.8 — up to +9.9 composite points Ask about this →

Each check links to what satisfies it. Publish the artifact, or tell us where it already lives, and the score moves on the next scoring run.

Not sure how this applies to your stack? Ask about any one item. Kin Lane reads every question, looks at your profile and your situation, and replies with what a fix would take — scoped to that one area, priced up front, yours whether you ship it or not. Ask a question →

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 the provider profile at artifacts.apis.io/martian-ai/apis.yml: open an issue on github.com/api-evangelist/martian-ai to ask a question or point us at an artifact you publish. Submit an artifact on GitHub — free → Manage your own listing — the Influence plan, $499/mo →

Standards implemented 3

Standards this provider implements or carries. De facto ones are profiled and measured by the API Commons; formal ones come from the standards directory and are linked by the provider's own tags. The evidence column says how each claim was established — not that it was made.

The Anthropic Messages Dialect reaches core

declared — publishes a spec that declares them

2 core of 244 operations graded · api-commons/models

The OpenAI Interface reaches core

declared — publishes a spec that declares them

2 core of 338 operations graded · api-commons/models

OpenAPI

measured — observed by APIs.io (published)

APIs 3

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

Martian Chat Completions API

The Chat Completions API from Martian — 1 operation(s) for chat completions.

Martian Messages API

The Messages API from Martian — 1 operation(s) for messages.

Martian Models API

The Models API from Martian — 1 operation(s) for models.

Open Collections 4

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

Martian Gateway Chat Completions API

OPEN COLLECTION

Martian Gateway Chat Completions Messages API

OPEN COLLECTION

Martian Gateway Chat Completions Models API

OPEN COLLECTION

Martian Gateway API

OPEN COLLECTION

Martian API pricing

Not yet checked against Martian's own pricing page. Compiled by API Evangelist on 2026-06-20 from www.withmartian.com; confirm before you rely on a figure. A free plan or tier is listed.

Plan	Price
Free Developer free	—
Pay-as-you-go usage	—
Enterprise enterprise	—

Plan details, limits and sources →

Rate limits

Requests Per Minute (RPM): see provider documentation requests
Tokens Per Minute (TPM): see provider documentation tokens
Free Request Allotment: 2500 requests

Compiled by API Evangelist, not yet checked against Martian's documentation. All 4 limits →

Pricing Plans 1

Published pricing tiers and plan structures.

Martian Plans Pricing

3 plans

PLANS

Rate Limits 1

Documented rate limits and quota policies.

Martian Rate Limits

4 limits

RATE LIMITS

Service Levels 1

Uptime the provider promises or reports, as SLA4OAI. Read from its own pages; APIs.io runs no monitors.

Martian

SLA

FinOps 1

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

Martian Finops

FINOPS

Event Specifications 1

AsyncAPI definitions for this provider's event-driven and streaming APIs.

Martian Gateway Chat Completions Streaming (HTTP + SSE)

AsyncAPI 2.6 description of the Martian Gateway's **chat completion streaming** surface. Martian does not publish a WebSocket API. The Martian Gateway is an OpenAI-compatible mo...

ASYNCAPI

Spectral Rules 1

Spectral governance rulesets for linting and validating these APIs. Counts are the severity each rule declares, not results of running them.

Martian — asyncapi rules

3 rules · 1 error-severity 2 warn-severity

SPECTRAL

OpenAPI Overlays 1

Overlays applied on top of this provider's contracts. Each card says who wrote it: a document the provider publishes, or one API Evangelist derived or generated.

Martian Models Api Certification Overlay

1 action · security · martian-ai-models-api-openapi.yml

DERIVED

Security Posture 2

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

Martian Authentication

http · 1 scheme

SECURITY

Martian Domain Security

TLSv1.3 · HSTS · DNSSEC · DMARC

SECURITY

Agentic Access (API Evangelist recommendations) 1

Recommended x-agentic-access execution contracts for AI agents.

Martian Agentic Access

3 operations · 2 acting

AGENTIC

Resources

Get Started 4

Portal, sign-up, and the first successful call

DeveloperPortal

DeveloperPortal

GettingStarted

GettingStarted

SignUp

SignUp

Login

Documentation 2

Reference material describing how the API behaves

Documentation

Documentation

APIReference

APIReference

Agent Surfaces 4

MCP servers, agent skills, and machine-readable catalogs

AgenticAccess

AgenticAccess

WellKnown

WellKnown

X-MCPServerCandidate

X-MCPServerCandidate

LLMsTxt

LLMsTxt

Design & Contract 4

Pagination, idempotency, versioning, errors, and events

Conventions

ErrorCatalog

Lifecycle

Conformance

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

Operate 3

Status, limits, changes, and where to get help

RateLimits

RateLimits

Support

Support

StatusPage

StatusPage

Commercial 2

Pricing, plans, and the legal terms of use

Plans

Plans

FinOps

FinOps

Company 3

The organization behind the API

LinkedIn

Website

Website

Blog

Blog

Other 1

Properties that don't map to a standard resource type

CapabilityMap

CapabilityMap

Source (apis.yml)

aid: martian-ai
url: https://raw.githubusercontent.com/api-evangelist/martian-ai/refs/heads/main/apis.yml
name: Martian
kind: company
description: Martian operates an LLM model router and gateway that dynamically routes each request to the best underlying
  model across providers for the optimal balance of quality, latency, and cost. The Martian Gateway exposes a drop-in, OpenAI-compatible
  REST API (and an Anthropic Messages-compatible surface) so applications can route across a large catalog of models by changing
  only the base URL.
deliveryModel:
  model: saas
  open_source: false
  commercial: true
  callable_host: true
  label: Hosted service · you call their endpoint
  confidence: high
  source:
  - openapi
  - pricing
  generated: '2026-08-28'
  method: derived
accessModel:
  pricing: freemium
  onboarding: self-serve
  trial: false
  try_now: true
  public: false
  gated: none
  gated_source:
  - onboarding
  label: Freemium · Self-serve signup
  confidence: medium
  source:
  - plans
  - authentication
  - security
  generated: '2026-11-13'
  method: derived
image: https://kinlane-images.s3.amazonaws.com/shared/apis-json/icons/martian-ai.png
x-docs-platform: readthedocs
x-docs-platform-confidence: medium
x-docs-platform-checked: 2026-10-04
tags:
- Artificial Intelligence
- LLM
- Model Router
- Gateways
- Cost Optimization
tags_raw:
- AI
- LLM
- Model Router
- Gateway
- Cost Optimization
created: '2026-06-20'
modified: '2026-08-08'
specificationVersion: '0.23'
apis:
- aid: martian-ai:martian-ai-chat-completions-api
  name: Martian Chat Completions API
  description: The Chat Completions API from Martian — 1 operation(s) for chat completions.
  humanURL: https://docs.withmartian.com/api-reference/endpoints
  baseURL: https://api.withmartian.com/v1
  tags:
  - Chat Completions
  properties:
  - type: OpenAPI
    url: openapi/martian-ai-chat-completions-api-openapi.yml
  - type: Documentation
    url: https://docs.withmartian.com/quickstart
  - type: APIReference
    url: https://docs.withmartian.com/api-reference/endpoints
  - type: Postman
    url: collections/martian-ai.postman_collection.json
- aid: martian-ai:martian-ai-messages-api
  name: Martian Messages API
  description: The Messages API from Martian — 1 operation(s) for messages.
  humanURL: https://docs.withmartian.com/api-reference/endpoints
  baseURL: https://api.withmartian.com/v1
  tags:
  - Message
  tags_raw:
  - Messages
  properties:
  - type: OpenAPI
    url: openapi/martian-ai-messages-api-openapi.yml
  - type: Documentation
    url: https://docs.withmartian.com/quickstart
  - type: APIReference
    url: https://docs.withmartian.com/api-reference/endpoints
  - type: Postman
    url: collections/martian-ai.postman_collection.json
- aid: martian-ai:martian-ai-models-api
  name: Martian Models API
  description: The Models API from Martian — 1 operation(s) for models.
  humanURL: https://docs.withmartian.com/api-reference/endpoints
  baseURL: https://api.withmartian.com/v1
  tags:
  - Models
  properties:
  - type: OpenAPI
    url: openapi/martian-ai-models-api-openapi.yml
  - type: Documentation
    url: https://docs.withmartian.com/quickstart
  - type: APIReference
    url: https://docs.withmartian.com/api-reference/endpoints
  - type: Postman
    url: collections/martian-ai.postman_collection.json
common:
- type: CapabilityMap
  url: capabilities/martian-ai-capability-edges.yml
  name: Martian Business Capability Map
- type: AgenticAccess
  url: agentic-access/martian-ai-agentic-access.yml
- type: DomainSecurity
  url: security/martian-ai-domain-security.yml
- type: Authentication
  url: authentication/martian-ai-authentication.yml
- type: GitHubOrganization
  url: https://github.com/withmartian
- type: LinkedIn
  url: https://www.linkedin.com/company/withmartian
- type: Website
  url: https://www.withmartian.com
- type: Documentation
  url: https://docs.withmartian.com
- type: Plans
  url: plans/martian-ai-plans-pricing.yml
- type: RateLimits
  url: rate-limits/martian-ai-rate-limits.yml
- type: FinOps
  url: finops/martian-ai-finops.yml
- type: Blog
  url: https://www.withmartian.com/blog
- type: DeveloperPortal
  url: https://docs.withmartian.com
- type: APIReference
  url: https://docs.withmartian.com/api-reference
- type: GettingStarted
  url: https://docs.withmartian.com/quickstart
- type: Support
  url: https://docs.withmartian.com/resources/support
- type: SignUp
  url: https://app.withmartian.com/
- type: Login
  url: https://app.withmartian.com/
- type: StatusPage
  url: https://status.withmartian.com
- type: Packages
  url: packages/martian-ai-packages.yml
- type: SDKs
  url: packages/martian-ai-packages.yml
- type: Conventions
  url: conventions/martian-ai-conventions.yml
- type: ErrorCatalog
  url: errors/martian-ai-error-codes.yml
- type: Lifecycle
  url: lifecycle/martian-ai-lifecycle.yml
- type: Conformance
  url: conformance/martian-ai-conformance.yml
- type: WellKnown
  url: well-known/martian-ai-well-known.yml
- type: X-MCPServerCandidate
  url: mcp/martian-ai-mcp.yml
  note: 'Renamed from MCPServer 2026-09-03 (roadmap#247): the manifest self-describes as status: candidate — a tool list derived
    from the published API contracts, not an existing server. The scorer already read the manifest and reported mcp_server
    correctly; the MCPServer type was crediting the artifact-type surfaces with a server that does not exist.'
- type: LLMsTxt
  url: llms/martian-ai-llms.txt
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com
x-merged-from:
- martian

Martian API — frequently asked questions

Does Martian have an API?

Yes. APIs.io lists 3 APIs from Martian, including Martian Chat Completions API, Martian Messages API and Martian Models API.

Is there an OpenAPI specification for the Martian API?

Yes. APIs.io indexes 3 OpenAPI specifications for Martian, each linked for download from this page.

How do I authenticate with the Martian API?

Martian uses bearer-token authentication (http · 1 scheme). The details are profiled on APIs.io as Martian Authentication.

How much does the Martian API cost?

APIs.io lists 3 pricing plans for Martian, with each plan's price, limits and inclusions under Pricing on this page.

Is the Martian API ready for AI agents?

Martian has a Kin Score of 43.4 out of 100 (developing) and an Agent Readiness score of 21.1 (agent-aware), scored by API Evangelist on 2026-11-13.

Work with this as data

Every provider here is available over the APIs.io API and to AI agents over MCP.

MCP server

One button, every client — Claude, Cursor, VS Code and the rest.

https://apis.io/mcp

Tools for providers

9 MCP tools reach this

find_providersBrowse and filter every provider in the catalog.
get_provider_artifactsEvery artifact this provider publishes, grouped by type.
get_provider_operationsEvery operation across all of their OpenAPIs — one call instead of parsing every spec.
get_provider_toolsEvery MCP tool they ship, with the operation each wraps.
get_provider_evidenceHow each part of their score was established. Free — the basis for a claim should not sit behind it.
get_provider_ratingPRO — composite, band, trend and facet scores.
apis_io_searchSTART HERE — APIs, providers and tags for one query, each with its total.
resolveTurn a domain, URL or GitHub org into the provider it belongs to.
find_cohortsEvery scored population of providers in the catalog.

All 92 tools →

Call it yourself

curl for this page

This provider

curl "https://apis.io/api/v1/providers/martian-ai"

All providers

curl "https://apis.io/api/v1/providers?limit=25"

Every operation they expose

curl "https://apis.io/api/v1/providers/martian-ai/operations?limit=25"

How their score was established

curl "https://apis.io/api/v1/providers/martian-ai/evidence"

Calls without X-API-Key need no key. Calls with it need a paid plan — get a key.

Get an API key

Free tier, no form to fill in. Signing in shares your email address with us — we store it to create your key and to recognise you if you sign in with another provider. See our Privacy Policy and Terms.

GitHub Google LinkedIn

A second provider on the same verified email joins the account you already have.