Arithym

Arithym is a precision math engine and verified scientific reference for AI agents. One connected tool covers everything from basic arithmetic to physics simulations — 209 methods across 22 domains, backed by a curated knowledge base of 981 entries, including 79 CODATA 2022 physics constants with SI dimensional metadata, all 118 elements, 385 exact unit definitions, 52 engineering materials, and 30 exact trigonometric values including radical expressions. One tool call, exact answer, zero token waste.

Arithym is listed with 1 API on the APIs.io network. Tagged areas include Artificial Intelligence, Math, Precision, Engineering, and Science.

Arithym’s developer surface includes authentication, documentation, and 10 more developer resources.

🌐 Visit website 📡 Profile data on GitHub

22.7/100 emerging ▬ flat Agent 24/100 agent aware Heartbeat 23/100 dormant Full breakdown ↓
scored 2026-11-06 · rubric v0.27.0 · Show this score on your site →

AccessFreemiumSelf serve⚡ Free to try

1 API

Artificial Intelligence Math Precision Engineering Science

Kin Score

Kin Score How this is scored →
scored 2026-11-06 · rubric v0.27.0

Composite quality — 22.7/100 · emerging

Contract Quality 0.0 / 21

Developer Ergonomics 2.8 / 17

Access Clarity 7.2 / 17

Operational Transparency 3.8 / 11

Contract Governance 0.0 / 10

Discoverability 5.6 / 9

Regulatory Posture 2.2 / 15

Agent readiness — 24/100 · agent aware

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 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

Delegated User Identity 6 / 6

Protected Resource Metadata 5 / 5

Registration Without a Human 6 / 6

Agentic Commerce Well-Known Document 0 / 5

Pagination 5 / 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 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.

The six quality facets above are damped to 85 points between them, because the conditional facet above carries the other 15. That is why each facet's contribution is shown against a damped maximum: raising a quality facet moves the composite by 85% of its nominal weight, not 100%. The full arithmetic is at apis.io/rating/.

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

Machine-Readable Contract +18 pts — api_specs includes an OpenAPI document
MCP Server +12 pts — deployment.mode + probe verdict on the mcp/ manifest, not the pointer; an unprobed slug falls back to authorship
Agentic Access Contract +10 pts — agentic_access artifact present (x-agentic-access), graded by author
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)
A2A Agent Card +8 pts — a2a/-a2a.yml manifest, graded on conformance.grade against A2A 1.0.0
Request/Response Examples +7 pts — share of operations carrying request/response examples; else an Examples / Code Samples link

7 more unmet checks in the Agent Readiness table above.

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

Contract Quality scores 0.0 — up to +25.0 composite points
Developer Ergonomics scores 16.7 — up to +16.7 composite points
Contract Governance scores 0.0 — up to +12.0 composite points

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.

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/arithym-xyz/apis.yml: open an issue on github.com/api-evangelist/arithym-xyz 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 2

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.

OAuth 2.0 Protected Resource Metadata

measured — observed by APIs.io (verified)

Dynamic Client Registration

measured — observed by APIs.io (published)

APIs 1

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

Arithym MCP

Arithym provides a precision math engine accessible via an MCP endpoint. The API requires an API key and OAuth authentication.

Arithym API pricing

Prices published by Arithym. This record is due for a re-check. A free plan or tier is listed.

Plan	Price
Explorer	Free
Pro	$5/mo
Engineer	$20/mo
Enterprise	Contact

Plan details, limits and sources →

Rate limits

Explorer: 50 computations / day
Pro: 250 computations / day
Engineer: 1,000 computations / day

All 4 limits →

Pricing Plans 1

Published pricing tiers and plan structures.

Arithym Xyz Plans Pricing

4 plans

PLANS

Rate Limits 1

Documented rate limits and quota policies.

Arithym Xyz Rate Limits

4 limits

RATE LIMITS

Security Posture 2

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

Arithym Xyz Authentication

1 scheme

SECURITY

Arithym Xyz Domain Security

TLSv1.3

SECURITY

Resources

Documentation 1

Reference material describing how the API behaves

Documentation

Documentation

Agent Surfaces 1

MCP servers, agent skills, and machine-readable catalogs

WellKnown

WellKnown

Design & Contract 1

Pagination, idempotency, versioning, errors, and events

ErrorCatalog

ErrorCatalog

Build 1

SDKs, sample code, and the tooling you integrate with

GitHubOrganization

GitHubOrganization

Access & Security 2

Authentication, authorization, and security posture

Authentication

Authentication

DomainSecurity

DomainSecurity

Operate 1

Status, limits, changes, and where to get help

RateLimits

RateLimits

Commercial 3

Pricing, plans, and the legal terms of use

Plans

Plans

TermsOfService

TermsOfService

PrivacyPolicy

PrivacyPolicy

Company 1

The organization behind the API

Website

Website

Other 1

Properties that don't map to a standard resource type

Hosts

Hosts

Source (apis.yml)

aid: arithym-xyz
name: Arithym
description: Arithym is a precision math engine and verified scientific reference for AI agents. One connected tool covers
  everything from basic arithmetic to physics simulations — 209 methods across 22 domains, backed by a curated knowledge base
  of 981 entries, including 79 CODATA 2022 physics constants with SI dimensional metadata, all 118 elements, 385 exact unit
  definitions, 52 engineering materials, and 30 exact trigonometric values including radical expressions. One tool call, exact
  answer, zero token waste.
accessModel:
  pricing: freemium
  onboarding: self-serve
  trial: false
  try_now: true
  public: false
  gated: none
  gated_source:
  - onboarding
  label: Freemium · Self-serve signup
  confidence: high
  probe_state: gated
  source:
  - plans
  - authentication
  - rate-limits
  - security
  generated: '2026-11-06'
  method: derived
image: https://arithym.xyz/logo.svg
url: https://artifacts.apis.io/arithym-xyz/apis.yml
x-type: company
x-source: harvest:mcp-registry
x-tier: profiled
x-tier-reason: enrichment pass 2026-11-01 (modular-v1; was harvest)
specificationVersion: '0.20'
created: '2026-11-01'
modified: '2026-11-01'
tags:
- Artificial Intelligence
- Math
- Precision
- Engineering
- Science
tags_raw:
- AI
- Math
- Precision
- Engineering
- Science
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com
- FN: APIs.json
  email: info@apis.io
common:
- type: RateLimits
  url: rate-limits/arithym-xyz-rate-limits.yml
- type: Plans
  url: plans/arithym-xyz-plans-pricing.yml
- type: Authentication
  url: authentication/arithym-xyz-authentication.yml
- type: ErrorCatalog
  url: errors/arithym-xyz-problem-types.yml
- type: WellKnown
  url: well-known/arithym-xyz-well-known.yml
- type: Hosts
  url: hosts/arithym-xyz-hosts.yml
- type: DomainSecurity
  url: security/arithym-xyz-domain-security.yml
- type: Website
  url: https://arithym.xyz/
- type: Documentation
  url: https://arithym.xyz/docs.html
- type: TermsOfService
  url: https://arithym.xyz/legal/terms.html
- type: PrivacyPolicy
  url: https://arithym.xyz/legal/privacy.html
- type: GitHubOrganization
  url: https://github.com/arithym-io
apis:
- name: Arithym MCP
  description: Arithym provides a precision math engine accessible via an MCP endpoint. The API requires an API key and OAuth
    authentication.
  humanURL: https://arithym.xyz/docs.html
  baseURL: https://arithym.xyz/mcp
  aid: arithym-xyz:arithym-mcp
x-coverage:
  state: gated
  reason: auth-required
  detail: API requires authentication via OAuth to access the MCP endpoint, preventing contract discovery.
  evidence:
  - url: https://arithym.xyz/.well-known/oauth-protected-resource
    status: 200
  checked: '2026-11-02'
x-enrichment:
  date: '2026-11-01'
  status: enriched
  artifacts_added: 14
  pass: modular-v1
  engine: identity=oss,contract=oss,surfaces=oss,docs=oss,regulatory=oss

Arithym API — frequently asked questions

Does Arithym have an API?

Yes. APIs.io lists 1 API from Arithym, including Arithym MCP.

How do I authenticate with the Arithym API?

Arithym documents its authentication (1 scheme). The details are profiled on APIs.io as Arithym Xyz Authentication.

How much does the Arithym API cost?

APIs.io lists 4 pricing plans for Arithym, with each plan's price, limits and inclusions under Pricing on this page.

Is the Arithym API ready for AI agents?

Arithym has a Kin Score of 22.7 out of 100 (emerging) and an Agent Readiness score of 24.1 (agent-aware), scored by API Evangelist on 2026-11-06.

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