MonsiTools

MonsiTools is a calculator and workflow builder: people build calculators by typing a formula in plain words and chain them into workflows. It ships 1262 ready-made browser calculators and data tools for business, finance, SaaS metrics, ecommerce and marketing, plus a JSON Calculation API (premium, 60 requests per minute, Bearer mt_live_ keys) and a remote MCP server at monsitools.com/mcp.

MonsiTools publishes 4 API contracts indexed on the APIs.io network, including Api Tools.json API, Calculate API, Keys API, and 1 more. Tagged areas include Company, Calculators, Finance, Workflows, and MCP.

The MonsiTools catalog on APIs.io includes 1 JSON-LD context and 1 Spectral governance ruleset.

MonsiTools’ developer surface includes authentication, documentation, changelog, signup flow, pricing, getting-started guide, and 18 more developer resources.

🌐 Visit website 📡 Source on GitHub
48.0/100 developing Agent 34/100 agent ready Full breakdown ↓
scored 2026-10-09 · rubric v0.23.0
2 published contracts 1 MCP Servers
CompanyCalculatorsFinanceWorkflowsMCPData Tools

Kin Score

Kin Score Kin Score How this is scored →
scored 2026-10-09 · rubric v0.23.0
Composite quality — 48.0/100 · developing
Contract Quality 13.0 / 21
Developer Ergonomics 7.3 / 17
Access Clarity 7.6 / 17
Operational Transparency 4.1 / 11
Contract Governance 2.2 / 10
Discoverability 5.5 / 9
Regulatory Posture 3.7 / 15
Agent readiness — 34/100 · agent ready
Machine-Readable Contract 18 / 18
Agentic Access Contract 10 / 10
Documented Reversibility 0 / 6
MCP Server 12 / 12
Machine-Readable Auth 10 / 10
Idempotency 0 / 9
Stable Error Semantics 8 / 8
Request/Response Examples 7 / 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 0 / 6
Protected Resource Metadata 0 / 5
Registration Without a Human 0 / 6
Agentic Commerce Well-Known Document 0 / 5
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/.
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/monsitools: 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 4

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

MonsiTools MCP Server

Remote MCP server exposing search_calculators, describe_calculator and calculate.

MonsiTools Api Tools.json API

The Api Tools.json API from MonsiTools — 1 operation(s) for api tools.json.

MonsiTools Calculate API

The Calculate API from MonsiTools — 1 operation(s) for calculate.

MonsiTools Keys API

The Keys API from MonsiTools — 1 operation(s) for keys.

MCP Servers 1

Model Context Protocol servers that expose these APIs to AI agents.

MonsiTools MCP Server

Remote MCP server at monsitools.com; 3 tools listed.

MCP SERVER

Rate Limits 1

Documented rate limits and quota policies.

Monsitools Rate Limits

1 limits

RATE LIMITS

Semantic Vocabularies 1

JSON-LD contexts and semantic vocabularies used across these APIs.

Monsitools Context

7 classes · 23 properties

JSON-LD

Spectral Rules 1

Spectral governance rulesets for linting and validating these APIs.

MonsiTools API Rules

15 rules · 12 errors 1 warnings 2 info

SPECTRAL

JSON Schema 5

Standalone JSON Schema definitions for this provider's data models.

ApiKeyCreated

4 properties

JSON SCHEMA

ApiKeyStatus

5 properties

JSON SCHEMA

CalculateRequest

2 properties

JSON SCHEMA

CalculateResult

5 properties

JSON SCHEMA

Tool

5 properties

JSON SCHEMA

Security Posture 2

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

Monsitools Authentication

http · 1 scheme

SECURITY

Monsitools Domain Security

TLSv1.3 · HSTS

SECURITY

Agentic Access 1

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

Monsitools Agentic Access

5 operations · 3 acting · 1 human-in-the-loop

5 operations · 3 acting

AGENTIC

Resources

Get Started 4

Portal, sign-up, and the first successful call

DeveloperPortal
DeveloperPortal
 Login
Login
 SignUp
SignUp
 GettingStarted
GettingStarted

Documentation 1

Reference material describing how the API behaves

Documentation
Documentation

Agent Surfaces 2

MCP servers, agent skills, and machine-readable catalogs

AgenticAccess
AgenticAccess
 LLMsTxt
LLMsTxt

Design & Contract 6

Pagination, idempotency, versioning, errors, and events

Spectral
Spectral
 JSONLD
JSONLD
 Vocabulary
Vocabulary
 DataModel
DataModel
 ErrorCatalog
ErrorCatalog
 Conformance
Conformance

Build 1

SDKs, sample code, and the tooling you integrate with

ToolCrosswalk
ToolCrosswalk

Access & Security 2

Authentication, authorization, and security posture

Authentication
Authentication
 DomainSecurity
DomainSecurity

Operate 2

Status, limits, changes, and where to get help

RateLimits
RateLimits
 ChangeLog
ChangeLog

Commercial 3

Pricing, plans, and the legal terms of use

Pricing
Pricing
 PrivacyPolicy
PrivacyPolicy
 TermsOfService
TermsOfService

Company 1

The organization behind the API

Website
Website

Other 2

Properties that don't map to a standard resource type

Hosts
Hosts
 Vendors
Vendors

Source (apis.yml)

apis.yml Raw ↑ 
aid: monsitools
name: MonsiTools
image: https://monsitools.com/og/default.png
description: 'MonsiTools is a calculator and workflow builder: people build calculators by typing a formula in plain words
  and chain them into workflows. It ships 1262 ready-made browser calculators and data tools for business, finance, SaaS metrics,
  ecommerce and marketing, plus a JSON Calculation API (premium, 60 requests per minute, Bearer mt_live_ keys) and a remote
  MCP server at monsitools.com/mcp.'
url: https://raw.githubusercontent.com/api-evangelist/monsitools/refs/heads/main/apis.yml
x-type: company
x-source: harvest:new-submission
x-tier: profiled
x-tier-reason: enrichment pass 2026-10-09 (local-v5; was harvest)
specificationVersion: '0.20'
created: '2026-10-09'
modified: '2026-10-09'
tags:
- Company
- Calculators
- Finance
- Workflows
- MCP
- Data Tools
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com
- FN: APIs.json
  email: info@apis.io
common:
- type: RateLimits
  url: rate-limits/monsitools-rate-limits.yml
- type: ToolCrosswalk
  url: mcp/monsitools-tool-crosswalk.yml
- type: AgenticAccess
  url: agentic-access/monsitools-agentic-access.yml
- type: Spectral
  url: rules/monsitools-rules.yml
- type: JSONLD
  url: json-ld/monsitools-context.jsonld
- type: Vocabulary
  url: vocabulary/monsitools-vocabulary.yml
- type: DataModel
  url: data-model/monsitools-data-model.yml
- type: ErrorCatalog
  url: errors/monsitools-problem-types.yml
- type: Conformance
  url: conformance/monsitools-conformance.yml
- type: LLMsTxt
  url: llms/monsitools-llms.txt
- type: Hosts
  url: hosts/monsitools-hosts.yml
- type: Vendors
  url: vendors/monsitools-vendors.yml
- type: Authentication
  url: authentication/monsitools-authentication.yml
- type: DomainSecurity
  url: security/monsitools-domain-security.yml
- type: Website
  url: https://monsitools.com
- type: Documentation
  url: https://monsitools.com/developers
- type: DeveloperPortal
  url: https://monsitools.com/developers
- type: ChangeLog
  url: https://monsitools.com/whats-new
- type: Login
  url: https://monsitools.com/login
- type: SignUp
  url: https://monsitools.com/login
- type: Pricing
  url: https://monsitools.com/pricing
- type: PrivacyPolicy
  url: https://monsitools.com/privacy
- type: TermsOfService
  url: https://monsitools.com/terms
- type: GettingStarted
  url: https://monsitools.com/guides
apis:
- aid: monsitools:mcp
  name: MonsiTools MCP Server
  description: Remote MCP server exposing search_calculators, describe_calculator and calculate.
  humanURL: https://monsitools.com/developers
  baseURL: https://monsitools.com/mcp
  tags:
  - MCP
  properties:
  - type: MCPServer
    url: mcp/monsitools-mcp.yml
- aid: monsitools:monsitools-api-tools-json-api
  name: MonsiTools Api Tools.json API
  description: The Api Tools.json API from MonsiTools — 1 operation(s) for api tools.json.
  humanURL: https://monsitools.com/developers
  baseURL: https://monsitools.com/mcp
  tags:
  - Api Tools.json
  properties:
  - type: OpenAPI
    url: openapi/monsitools-api-tools-json-api-openapi.yml
  - type: JSONSchema
    url: json-schema/monsitools-calculate-request-schema.json
  - type: JSONSchema
    url: json-schema/monsitools-api-key-status-schema.json
  - type: JSONSchema
    url: json-schema/monsitools-calculate-result-schema.json
  - type: JSONSchema
    url: json-schema/monsitools-tool-schema.json
  - type: JSONSchema
    url: json-schema/monsitools-api-key-created-schema.json
- aid: monsitools:monsitools-calculate-api
  name: MonsiTools Calculate API
  description: The Calculate API from MonsiTools — 1 operation(s) for calculate.
  humanURL: https://monsitools.com/developers
  baseURL: https://monsitools.com/mcp
  tags:
  - Calculate
  properties:
  - type: OpenAPI
    url: openapi/monsitools-calculate-api-openapi.yml
  - type: JSONSchema
    url: json-schema/monsitools-calculate-request-schema.json
  - type: JSONSchema
    url: json-schema/monsitools-api-key-status-schema.json
  - type: JSONSchema
    url: json-schema/monsitools-calculate-result-schema.json
  - type: JSONSchema
    url: json-schema/monsitools-tool-schema.json
  - type: JSONSchema
    url: json-schema/monsitools-api-key-created-schema.json
- aid: monsitools:monsitools-keys-api
  name: MonsiTools Keys API
  description: The Keys API from MonsiTools — 1 operation(s) for keys.
  humanURL: https://monsitools.com/developers
  baseURL: https://monsitools.com/mcp
  tags:
  - Keys
  properties:
  - type: OpenAPI
    url: openapi/monsitools-keys-api-openapi.yml
  - type: JSONSchema
    url: json-schema/monsitools-calculate-request-schema.json
  - type: JSONSchema
    url: json-schema/monsitools-api-key-status-schema.json
  - type: JSONSchema
    url: json-schema/monsitools-calculate-result-schema.json
  - type: JSONSchema
    url: json-schema/monsitools-tool-schema.json
  - type: JSONSchema
    url: json-schema/monsitools-api-key-created-schema.json
x-submission-notes: Calculator JSON API
x-submission-probe: OpenAPI 3.1 5 ops; invented path 404
x-submitted-by: monsibdtheadventurer@gmail.com (apis.io/add, 2026-10-09)
x-enrichment:
  date: '2026-10-09'
  status: enriched
  artifacts_added: 14
  pass: local-v5

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