MSG91

MSG91 provides a comprehensive cloud communications platform offering SMS, voice, email, WhatsApp, RCS, and OTP services. It enables businesses to engage customers across multiple channels via robust APIs, supporting dynamic messaging, campaign automation, and contact management. With global reach and high volume handling, MSG91 serves over 30,000 businesses worldwide, delivering reliable, scalable communication solutions for enterprises of all sizes.

MSG91 is listed with 1 API on the APIs.io network. Tagged areas include Communications, Cloud, Messaging, and SMS.

MSG91’s developer surface includes documentation, API reference, getting-started guide, support, pricing, and 13 more developer resources.

🌐 Visit website 📡 Profile data on GitHub

21.6/100 emerging ▼ -9.8 Agent 4/100 human only Full breakdown ↓
scored 2026-11-06 · rubric v0.27.0 · Show this score on your site →

AccessFreemium

1 API

Communications Cloud Messaging SMS

Kin Score

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

Composite quality — 21.6/100 · emerging

Contract Quality 0.0 / 21

Developer Ergonomics 4.9 / 17

Access Clarity 9.2 / 17

Operational Transparency 0.4 / 11

Contract Governance 0.0 / 10

Discoverability 5.5 / 9

Regulatory Posture 1.2 / 15

Agent readiness — 4/100 · human only

Machine-Readable Contract 0 / 18

Agentic Access Contract 0 / 10

Documented Reversibility 0 / 6

MCP Server 0 / 12

Machine-Readable Auth 0 / 10

Idempotency 0 / 9

Stable Error Semantics 0 / 8

Request/Response Examples 0 / 7

Rate-Limit Signaling 0 / 7

Typed Event Surface 6 / 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 Telecommunications 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
Machine-Readable Auth +10 pts — a served openid-configuration/oauth-authorization-server carrying `issuer` (served), else the securitySchemes class in the provider OpenAPIs — bound (mutualTLS, DPoP, Signature) > negotiable (oauth2 authorizationCode/clientCredentials, openIdConnect) > bearer (http bearer, apiKey)
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

12 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 28.6 — up to +14.3 composite points
Operational Transparency scores 3.9 — up to +12.5 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/msg91/apis.yml: open an issue on github.com/api-evangelist/msg91 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.

MSG91 API

Messaging API providing SMS, voice, email, WhatsApp, and OTP services.

MSG91 API pricing

Prices published by MSG91, read 2026-10-14 from msg91.com/us/pricing/hello.

Plan	Price
Free	0 USD/ month
Basic	40 USD/ month
Premium	80 USD/ month
Basic	400 USD/ year
Premium	800 USD/ year

Plan details, limits and sources →

Pricing Plans 1

Published pricing tiers and plan structures.

Msg91 Plans Pricing

5 plans

PLANS

Security Posture 1

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

Msg91 Domain Security

TLSv1.3 · HSTS · DMARC

SECURITY

Resources

Get Started 3

Portal, sign-up, and the first successful call

Login

DeveloperPortal

DeveloperPortal

GettingStarted

GettingStarted

Documentation 2

Reference material describing how the API behaves

Documentation

Documentation

APIReference

APIReference

Agent Surfaces 1

MCP servers, agent skills, and machine-readable catalogs

LLMsTxt

LLMsTxt

Design & Contract 1

Pagination, idempotency, versioning, errors, and events

Webhooks

Webhooks

Build 2

SDKs, sample code, and the tooling you integrate with

SDKs

SDKs

Packages

Packages

Access & Security 1

Authentication, authorization, and security posture

DomainSecurity

DomainSecurity

Operate 1

Status, limits, changes, and where to get help

Support

Support

Commercial 4

Pricing, plans, and the legal terms of use

Plans

TermsOfService

PrivacyPolicy

Pricing

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: msg91
name: MSG91
accessModel:
  pricing: freemium
  onboarding: unknown
  trial: false
  try_now: false
  public: false
  label: Freemium
  confidence: low
  probe_state: unreadable
  source:
  - plans
  - security
  generated: '2026-11-06'
  method: derived
image: https://msg91.com/assets/brand/favicon.svg
description: MSG91 provides a comprehensive cloud communications platform offering SMS, voice, email, WhatsApp, RCS, and OTP
  services. It enables businesses to engage customers across multiple channels via robust APIs, supporting dynamic messaging,
  campaign automation, and contact management. With global reach and high volume handling, MSG91 serves over 30,000 businesses
  worldwide, delivering reliable, scalable communication solutions for enterprises of all sizes.
url: https://raw.githubusercontent.com/api-evangelist/msg91/refs/heads/main/apis.yml
x-type: company
x-source: harvest:tag-qc
x-tier: profiled
x-tier-reason: enrichment pass 2026-10-14 (modular-v1; was harvest)
specificationVersion: '0.20'
created: '2026-10-13'
modified: '2026-10-13'
tags:
- Communications
- Cloud
- Messaging
- SMS
tags_raw:
- Communications
- Cloud
- API
- Messaging
- SMS
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com
- FN: APIs.json
  email: info@apis.io
common:
- type: Plans
  url: plans/msg91-plans-pricing.yml
- type: LLMsTxt
  url: llms/msg91-llms.txt
- type: Hosts
  url: hosts/msg91-hosts.yml
- type: Vendors
  url: vendors/msg91-vendors.yml
- type: SDKs
  url: packages/msg91-packages.yml
- type: Packages
  url: packages/msg91-packages.yml
- type: Webhooks
  url: https://msg91.com/help/webhooks
- type: TermsOfService
  url: https://msg91.com/terms-of-use
- type: PrivacyPolicy
  url: https://msg91.com/privacy-policy
- type: Login
  url: https://control.msg91.com/signin/
- type: DeveloperPortal
  url: https://docs.msg91.com\\\
- type: DomainSecurity
  url: security/msg91-domain-security.yml
- type: Website
  url: https://msg91.com
- type: Documentation
  url: https://docs.msg91.com
- type: APIReference
  url: https://docs.msg91.com/overview
- type: GettingStarted
  url: https://msg91.com/signup
- type: Support
  url: https://msg91.com/contact-us
- type: Pricing
  url: https://msg91.com/pricing/hello
apis:
- name: MSG91 API
  description: Messaging API providing SMS, voice, email, WhatsApp, and OTP services.
  humanURL: https://dev.msg91.com/apidoc/
  baseURL: https://api.msg91.com
  aid: msg91:msg91-api
x-coverage:
  state: unreadable
  reason: no-machine-readable-spec
  detail: API documentation returns 403/404 for common OpenAPI URLs, no machine-readable spec found.
  evidence:
  - url: https://api.msg91.com/openapi.json
    status: 403
  checked: '2026-10-14'
x-enrichment:
  date: '2026-10-14'
  status: enriched
  artifacts_added: 9
  pass: modular-v1
  engine: identity=local,contract=local,surfaces=local,docs=local,regulatory=local

MSG91 API — frequently asked questions

Does MSG91 have an API?

Yes. APIs.io lists 1 API from MSG91, including MSG91 API.

How much does the MSG91 API cost?

MSG91 publishes its prices; its Free plan is 0 USD/ month as of 2026-10-14. APIs.io lists 5 pricing plans for MSG91, with each plan's price, limits and inclusions under Pricing on this page.

Is the MSG91 API ready for AI agents?

MSG91 has a Kin Score of 21.6 out of 100 (emerging) and an Agent Readiness score of 3.9 (human-only), scored by API Evangelist on 2026-11-06.

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