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 20 more developer resources.

🌐 Visit website 📡 Profile data on GitHub

50.6/100 developing ▼ -7.9 Agent 38/100 agent ready Full breakdown ↓
scored 2026-11-06 · rubric v0.27.0 · Show this score on your site →

AccessPaid

1 published contract 1 MCP Servers

Company Calculators Finance Workflows MCP Data Tools

What this lets a business do 1

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

Developer Platform & API Ecosystem Management

BC-4270

Keys

POST /api/keys DELETE /api/keys

Kin Score

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

Composite quality — 50.6/100 · developing

Contract Quality 12.4 / 19

Developer Ergonomics 4.1 / 15

Access Clarity 9.3 / 15

Operational Transparency 2.8 / 10

Contract Governance 2.0 / 9

Discoverability 5.6 / 8

Regulatory Posture 3.1 / 15

Create-or-Update Ergonomics 2.2 / 10

Agent readiness — 38/100 · 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

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 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/.

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

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
Registration Without a Human +6 pts — a `registration_endpoint` in the served RFC 8414 / OIDC discovery document
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)
Typed Event Surface +6 pts — AsyncAPI document, OR webhooks/callbacks objects in the as-published OpenAPI, OR common[].type includes Webhooks
Documented Reversibility +6 pts — a reversal operation in the contract, graded up when a window is documented too

6 more unmet checks in the Agent Readiness table above.

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

Developer Ergonomics scores 27.4 — up to +14.5 composite points
Contract Governance scores 22.0 — up to +9.4 composite points
Operational Transparency scores 28.9 — up to +9.2 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/monsitools/apis.yml: open an issue on github.com/api-evangelist/monsitools 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.

Model Context Protocol (MCP)

measured — observed by APIs.io (documented)

OpenAPI

measured — observed by APIs.io (published)

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

MonsiTools API pricing

Prices published by MonsiTools, read 2026-10-28 from monsitools.com/pricing.

Plan	Price
Weekly	$2.49/week Includes: Premium: unlimited workflows, up to 100 calculators, batch runs, API, branded exports
Monthly	$5.49/month Includes: Premium features
Yearly	$44.99/year Includes: About $3.75 a month, 32% less than paying monthly
Limited account	Staying on the limited plan? Includes: 5 workflow runs a month, save 5 calculators, unlimited calculator uses

Plan details, limits and sources →

Rate limits

Calculation API per account: Premium accounts, 60 requests per minute

Rate-limit details →

Billed by: week · FinOps profile →

Pricing Plans 2

Published pricing tiers and plan structures.

Monsitools Plans Pricing

4 plans

PLANS

Monsitools Price Estimates

0 plans

PLANS

Rate Limits 1

Documented rate limits and quota policies.

Monsitools Rate Limits

1 limits

RATE LIMITS

Service Levels 1

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

MonsiTools

SLA

FinOps 1

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

Monsitools Finops

FINOPS

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

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

JSONLD

Vocabulary

DataModel

ErrorCatalog

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 4

Pricing, plans, and the legal terms of use

Plans

Pricing

PrivacyPolicy

TermsOfService

Company 1

The organization behind the API

Website

Website

Other 3

Properties that don't map to a standard resource type

CapabilityMap

CapabilityMap

Hosts

Hosts

Vendors

Vendors

Source (apis.yml)

aid: monsitools
name: MonsiTools
accessModel:
  pricing: paid
  onboarding: unknown
  trial: false
  try_now: false
  public: false
  label: Paid
  confidence: high
  source:
  - plans
  - authentication
  - rate-limits
  - security
  generated: '2026-11-06'
  method: derived
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: Plans
  url: plans/monsitools-plans-pricing.yml
- type: CapabilityMap
  url: capabilities/monsitools-capability-edges.yml
  name: MonsiTools Business Capability Map
- 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

MonsiTools API — frequently asked questions

Does MonsiTools have an API?

Yes. APIs.io lists 4 APIs from MonsiTools, including MonsiTools MCP Server, MonsiTools Api Tools.json API and MonsiTools Calculate API, and 1 more.

Is there an OpenAPI specification for the MonsiTools API?

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

How do I authenticate with the MonsiTools API?

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

How much does the MonsiTools API cost?

MonsiTools publishes its prices; its Weekly plan is $2.49/week as of 2026-10-28. APIs.io lists 4 pricing plans for MonsiTools, with each plan's price, limits and inclusions under Pricing on this page.

Does MonsiTools have an MCP server?

Yes. APIs.io lists 1 MCP server for MonsiTools: Remote MCP server at monsitools.com; 3 tools listed.

Is the MonsiTools API ready for AI agents?

MonsiTools has a Kin Score of 50.6 out of 100 (developing) and an Agent Readiness score of 38.0 (agent-ready), scored by API Evangelist on 2026-11-06.

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