Not Diamond website screenshot

Not Diamond

Not Diamond is an AI model router that determines the best LLM to call for any given prompt. Its REST API routes each request to the optimal model across providers based on quality, cost, and latency tradeoffs, accepts real-time feedback to personalize routing, and can train custom routers from evaluation datasets.

Not Diamond publishes 4 APIs on the APIs.io network, including Custom Routers API, Feedback API, Model Routing API, and 1 more. Tagged areas include AI, LLM, Model Routing, Router, and Orchestration.

Not Diamond’s developer surface includes authentication, engineering blog, documentation, and 8 more developer resources.

🌐 Visit website 📡 Source on GitHub
38.0/100 thin ▬ flat Agent 31/100 agent aware Full breakdown ↓
scored 2026-08-05 · rubric v0.9.1
AccessPaidSelf serve
4 APIs
AILLMModel RoutingRouterOrchestration

Kin Score

Kin Score Kin Score How this is scored →
scored 2026-08-05 · rubric v0.9.1
Composite quality — 38.0/100 · thin
Contract Quality 15.7 / 25
Developer Ergonomics 4.3 / 20
Commercial Clarity 5.8 / 20
Operational Transparency 4.8 / 13
Governance 0.0 / 12
Discoverability 7.4 / 10
Agent readiness — 31/100 · agent aware
Machine-Readable Contract 18 / 18
Agentic Access Contract 10 / 10
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 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/notdiamond: 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 4

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

Not Diamond Custom Routers API

The Custom Routers API from Not Diamond — 2 operation(s) for custom routers.

Not Diamond Feedback API

The Feedback API from Not Diamond — 2 operation(s) for feedback.

Not Diamond Model Routing API

The Model Routing API from Not Diamond — 1 operation(s) for model routing.

Not Diamond Models API

The Models API from Not Diamond — 1 operation(s) for models.

Open Collections 1

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

Not Diamond API

OPEN COLLECTION

Pricing Plans 1

Published pricing tiers and plan structures.

Notdiamond Plans Pricing

2 plans

PLANS

Rate Limits 1

Documented rate limits and quota policies.

Notdiamond Rate Limits

3 limits

RATE LIMITS

FinOps 1

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

Notdiamond Finops

FINOPS

Security Posture 2

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

Notdiamond Authentication

http · 1 scheme

SECURITY

Notdiamond Domain Security

TLSv1.3 · HSTS

SECURITY

Agentic Access 1

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

Notdiamond Agentic Access

6 operations · 5 acting

6 operations · 5 acting

AGENTIC

Resources

Documentation 1

Reference material describing how the API behaves

Documentation
Documentation

Agent Surfaces 1

MCP servers, agent skills, and machine-readable catalogs

AgenticAccess
AgenticAccess

Build 1

SDKs, sample code, and the tooling you integrate with

GitHubOrganization
GitHubOrganization

Access & Security 2

Authentication, authorization, and security posture

DomainSecurity
DomainSecurity
 Authentication
Authentication

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 3

The organization behind the API

Blog
Blog
 LinkedIn
LinkedIn
 Website
Website

Source (apis.yml)

apis.yml Raw ↑ 
aid: notdiamond
url: https://raw.githubusercontent.com/api-evangelist/notdiamond/refs/heads/main/apis.yml
name: Not Diamond
kind: company
description: Not Diamond is an AI model router that determines the best LLM to call for any given prompt. Its REST API routes
  each request to the optimal model across providers based on quality, cost, and latency tradeoffs, accepts real-time feedback
  to personalize routing, and can train custom routers from evaluation datasets.
accessModel:
  pricing: paid
  onboarding: self-serve
  trial: false
  try_now: false
  public: false
  label: Paid · 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/notdiamond.png
tags:
- AI
- LLM
- Model Routing
- Router
- Orchestration
created: '2026-06-20'
modified: '2026-06-20'
specificationVersion: '0.19'
apis:
- aid: notdiamond:notdiamond-custom-routers-api
  name: Not Diamond Custom Routers API
  description: The Custom Routers API from Not Diamond — 2 operation(s) for custom routers.
  humanURL: https://docs.notdiamond.ai/reference/token_model_select_v2_modelrouter_modelselect_post
  baseURL: https://api.notdiamond.ai/v2
  tags:
  - Custom Routers
  properties:
  - type: OpenAPI
    url: openapi/notdiamond-custom-routers-api-openapi.yml
  - type: Documentation
    url: https://docs.notdiamond.ai/docs/quickstart
  - type: APIReference
    url: https://docs.notdiamond.ai/reference/token_model_select_v2_modelrouter_modelselect_post
  - type: PostmanCollection
    url: collections/notdiamond.postman_collection.json
  - type: OpenCollection
    url: collections/notdiamond.opencollection.json
  - type: APIReference
    url: https://docs.notdiamond.ai/reference/list_models_v2_models_get
  - type: Documentation
    url: https://docs.notdiamond.ai/docs/real-time-personalization
  - type: APIReference
    url: https://docs.notdiamond.ai/reference/train_custom_router_v2_pzn_traincustomrouter_post
- aid: notdiamond:notdiamond-feedback-api
  name: Not Diamond Feedback API
  description: The Feedback API from Not Diamond — 2 operation(s) for feedback.
  humanURL: https://docs.notdiamond.ai/reference/token_model_select_v2_modelrouter_modelselect_post
  baseURL: https://api.notdiamond.ai/v2
  tags:
  - Feedback
  properties:
  - type: OpenAPI
    url: openapi/notdiamond-feedback-api-openapi.yml
  - type: Documentation
    url: https://docs.notdiamond.ai/docs/quickstart
  - type: APIReference
    url: https://docs.notdiamond.ai/reference/token_model_select_v2_modelrouter_modelselect_post
  - type: PostmanCollection
    url: collections/notdiamond.postman_collection.json
  - type: OpenCollection
    url: collections/notdiamond.opencollection.json
  - type: APIReference
    url: https://docs.notdiamond.ai/reference/list_models_v2_models_get
  - type: Documentation
    url: https://docs.notdiamond.ai/docs/real-time-personalization
  - type: APIReference
    url: https://docs.notdiamond.ai/reference/train_custom_router_v2_pzn_traincustomrouter_post
- aid: notdiamond:notdiamond-model-routing-api
  name: Not Diamond Model Routing API
  description: The Model Routing API from Not Diamond — 1 operation(s) for model routing.
  humanURL: https://docs.notdiamond.ai/reference/token_model_select_v2_modelrouter_modelselect_post
  baseURL: https://api.notdiamond.ai/v2
  tags:
  - Model Routing
  properties:
  - type: OpenAPI
    url: openapi/notdiamond-model-routing-api-openapi.yml
  - type: Documentation
    url: https://docs.notdiamond.ai/docs/quickstart
  - type: APIReference
    url: https://docs.notdiamond.ai/reference/token_model_select_v2_modelrouter_modelselect_post
  - type: PostmanCollection
    url: collections/notdiamond.postman_collection.json
  - type: OpenCollection
    url: collections/notdiamond.opencollection.json
  - type: APIReference
    url: https://docs.notdiamond.ai/reference/list_models_v2_models_get
  - type: Documentation
    url: https://docs.notdiamond.ai/docs/real-time-personalization
  - type: APIReference
    url: https://docs.notdiamond.ai/reference/train_custom_router_v2_pzn_traincustomrouter_post
- aid: notdiamond:notdiamond-models-api
  name: Not Diamond Models API
  description: The Models API from Not Diamond — 1 operation(s) for models.
  humanURL: https://docs.notdiamond.ai/reference/token_model_select_v2_modelrouter_modelselect_post
  baseURL: https://api.notdiamond.ai/v2
  tags:
  - Models
  properties:
  - type: OpenAPI
    url: openapi/notdiamond-models-api-openapi.yml
  - type: Documentation
    url: https://docs.notdiamond.ai/docs/quickstart
  - type: APIReference
    url: https://docs.notdiamond.ai/reference/token_model_select_v2_modelrouter_modelselect_post
  - type: PostmanCollection
    url: collections/notdiamond.postman_collection.json
  - type: OpenCollection
    url: collections/notdiamond.opencollection.json
  - type: APIReference
    url: https://docs.notdiamond.ai/reference/list_models_v2_models_get
  - type: Documentation
    url: https://docs.notdiamond.ai/docs/real-time-personalization
  - type: APIReference
    url: https://docs.notdiamond.ai/reference/train_custom_router_v2_pzn_traincustomrouter_post
common:
- type: AgenticAccess
  url: agentic-access/notdiamond-agentic-access.yml
- type: DomainSecurity
  url: security/notdiamond-domain-security.yml
- type: Authentication
  url: authentication/notdiamond-authentication.yml
- url: https://www.notdiamond.ai/blog
  type: Blog
- type: GitHubOrganization
  url: https://github.com/Not-Diamond
- type: LinkedIn
  url: https://www.linkedin.com/company/not-diamond
- type: Website
  url: https://www.notdiamond.ai
- type: Documentation
  url: https://docs.notdiamond.ai
- type: Plans
  url: plans/notdiamond-plans-pricing.yml
- type: RateLimits
  url: rate-limits/notdiamond-rate-limits.yml
- type: FinOps
  url: finops/notdiamond-finops.yml
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com