CallSimple

CallSimple is an AI phone-calling service run by Indianappguy Tech Pvt Ltd (Bengaluru, India). You tell ChatGPT or Claude (or the web app) who to call and what to say; CallSimple's AI voice calls them from an Indian +91 number in Hindi or English, delivers the message, asks your questions and reports back what they said. It is offered as an MCP server (https://callsimple.app/mcp) that users add as a custom connector in Claude or a custom MCP app in ChatGPT, with prepaid call packs billed only when the callee picks up.

CallSimple is listed with 1 API on the APIs.io network. Tagged areas include Company, AI Voice Agents, Phone Calls, Model Context Protocol, and ChatGPT Apps.

CallSimple’s developer surface includes authentication, getting-started guide, documentation, pricing, support, and 13 more developer resources.

🌐 Visit website 📡 Profile data on GitHub

25.2/100 emerging Agent 8/100 agent aware Full breakdown ↓
scored 2026-11-06 · rubric v0.27.0 · Show this score on your site →

1 API

Company AI Voice Agents Phone CallsModel Context ProtocolChatGPT AppsClaude ConnectorsVoice India

Kin Score

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

Composite quality — 25.2/100 · emerging

Contract Quality 0.0 / 21

Developer Ergonomics 4.3 / 17

Access Clarity 7.5 / 17

Operational Transparency 2.1 / 11

Contract Governance 0.0 / 10

Discoverability 5.6 / 9

Regulatory Posture 4.6 / 15

Agent readiness — 8/100 · 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 0 / 8

Request/Response Examples 0 / 7

Rate-Limit Signaling 7 / 7

Typed Event Surface 0 / 6

Agent Skills 0 / 5

Well-Known Catalog 4 / 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 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)
Stable Error Semantics +8 pts — OpenAPI $refs a shared error schema across 4xx/5xx responses (verified), else common[].type includes ErrorCatalog / ErrorCodes / DeclineCodes
A2A Agent Card +8 pts — a2a/-a2a.yml manifest, graded on conformance.grade against A2A 1.0.0

10 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 25.0 — up to +15.0 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/callsimple-app/apis.yml: open an issue on github.com/api-evangelist/callsimple-app 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 →

APIs 1

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

CallSimple MCP Server

Remote Model Context Protocol server that users add as a custom connector in Claude or a custom MCP app in ChatGPT so the assistant can have CallSimple's AI voice place phone ca...

Pricing Plans 1

Published pricing tiers and plan structures.

Callsimple App Plans Pricing

4 plans

PLANS

Rate Limits 1

Documented rate limits and quota policies.

Callsimple App Rate Limits

2 limits

RATE LIMITS

Security Posture 2

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

Callsimple App Authentication

1 scheme

SECURITY

Callsimple App Domain Security

TLSv1.3

SECURITY

Scopes 1

OAuth scopes governing access to this provider's APIs.

Callsimple App Scopes

2 scopes

SCOPES

Resources

Get Started 1

Portal, sign-up, and the first successful call

GettingStarted

GettingStarted

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 2

Pagination, idempotency, versioning, errors, and events

Conventions

Conventions

Conformance

Conformance

Build 1

SDKs, sample code, and the tooling you integrate with

IntegrationEdges

IntegrationEdges

Access & Security 3

Authentication, authorization, and security posture

Authentication

Authentication

OAuthScopes

OAuthScopes

DomainSecurity

DomainSecurity

Operate 2

Status, limits, changes, and where to get help

RateLimits

RateLimits

Support

Support

Commercial 4

Pricing, plans, and the legal terms of use

Plans

Pricing

TermsOfService

PrivacyPolicy

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)

aid: callsimple-app
name: CallSimple
description: CallSimple is an AI phone-calling service run by Indianappguy Tech Pvt Ltd (Bengaluru, India). You tell ChatGPT
  or Claude (or the web app) who to call and what to say; CallSimple's AI voice calls them from an Indian +91 number in Hindi
  or English, delivers the message, asks your questions and reports back what they said. It is offered as an MCP server (https://callsimple.app/mcp)
  that users add as a custom connector in Claude or a custom MCP app in ChatGPT, with prepaid call packs billed only when
  the callee picks up.
url: https://artifacts.apis.io/callsimple-app/apis.yml
x-type: company
x-source: harvest:mcp-registry
x-tier: profiled
x-tier-reason: enrichment pass 2026-11-03 (modular-v1; was harvest)
specificationVersion: '0.20'
created: '2026-11-03'
modified: '2026-11-03'
tags:
- Company
- AI Voice Agents
- Phone Calls
- Model Context Protocol
- ChatGPT Apps
- Claude Connectors
- Voice
- India
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com
- FN: APIs.json
  email: info@apis.io
image: https://callsimple.app/og.png
common:
- type: IntegrationEdges
  url: integrations/callsimple-app-integration-edges.yml
- type: RateLimits
  url: rate-limits/callsimple-app-rate-limits.yml
- type: Plans
  url: plans/callsimple-app-plans-pricing.yml
- type: Conventions
  url: conventions/callsimple-app-conventions.yml
- type: Authentication
  url: authentication/callsimple-app-authentication.yml
- type: OAuthScopes
  url: scopes/callsimple-app-scopes.yml
- type: Conformance
  url: conformance/callsimple-app-conformance.yml
- type: WellKnown
  url: well-known/callsimple-app-well-known.yml
- type: Hosts
  url: hosts/callsimple-app-hosts.yml
- type: Vendors
  url: vendors/callsimple-app-vendors.yml
- type: DomainSecurity
  url: security/callsimple-app-domain-security.yml
- type: Website
  url: https://callsimple.app/
- type: GettingStarted
  url: https://callsimple.app/claude
- type: Documentation
  url: https://callsimple.app/chatgpt
- type: Pricing
  url: https://callsimple.app/pricing
- type: Support
  url: https://callsimple.app/support
- type: TermsOfService
  url: https://callsimple.app/terms
- type: PrivacyPolicy
  url: https://callsimple.app/privacy
apis:
- aid: callsimple-app:callsimple-mcp-server
  name: CallSimple MCP Server
  description: Remote Model Context Protocol server that users add as a custom connector in Claude or a custom MCP app in
    ChatGPT so the assistant can have CallSimple's AI voice place phone calls on their behalf. Access uses OAuth (bearer token,
    scopes calls and offline_access per the server's protected-resource metadata). No OpenAPI, AsyncAPI or GraphQL contract
    is published, and tools/list returns 401 without a token.
  humanURL: https://callsimple.app/claude
  baseURL: https://callsimple.app/mcp
  tags:
  - Model Context Protocol
  - Phone Calls
  - Voice
  properties:
  - type: Documentation
    url: https://callsimple.app/claude
  - type: Documentation
    url: https://callsimple.app/chatgpt
x-coverage:
  state: covered
  reason: identity-verified
  detail: Name and legal entity (Indianappguy Tech Pvt Ltd) read from callsimple.app title, footer and terms page.
  evidence:
  - url: https://callsimple.app/
    status: 200
  - url: https://callsimple.app/claude
    status: 200
  - url: https://callsimple.app/chatgpt
    status: 200
  - url: https://callsimple.app/pricing
    status: 200
  - url: https://callsimple.app/support
    status: 200
  - url: https://callsimple.app/terms
    status: 200
  - url: https://callsimple.app/privacy
    status: 200
x-enrichment:
  date: '2026-11-03'
  status: enriched
  artifacts_added: 17
  pass: modular-v1
  engine: identity=anthropic,contract=anthropic,surfaces=anthropic,docs=anthropic,regulatory=anthropic

CallSimple API — frequently asked questions

Does CallSimple have an API?

Yes. APIs.io lists 1 API from CallSimple, including CallSimple MCP Server.

How do I authenticate with the CallSimple API?

CallSimple uses bearer-token authentication (1 scheme). The details are profiled on APIs.io as Callsimple App Authentication.

How much does the CallSimple API cost?

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

Is the CallSimple API ready for AI agents?

CallSimple has a Kin Score of 25.2 out of 100 (emerging) and an Agent Readiness score of 7.9 (agent-aware), scored by API Evangelist on 2026-11-06.

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