SecondFactor

SecondFactor provides an OTP Delivery & Verification API that enables developers to send one‑time passwords via SMS, WhatsApp, Viber, and RCS. The platform intelligently routes messages to the lowest‑cost channel, offers automatic fallback, delivery logs, template management, and a pricing calculator. It aims to reduce authentication costs and improve user experience with a single, multi‑channel API. Documentation, pricing, and support are available online, and the service is trusted by global companies for secure, fast, and affordable OTP delivery.

SecondFactor is profiled on the APIs.io network. Tagged areas include Company, OTP, Authentication, Multi-Channel, and Messaging.

The SecondFactor catalog on APIs.io includes 1 event-driven AsyncAPI specification.

SecondFactor’s developer surface includes getting-started guide, authentication, documentation, support, engineering blog, pricing, signup flow, and 11 more developer resources.

🌐 Visit website 📡 Profile data on GitHub

34.7/100 thin Agent 29/100 agent ready Full breakdown ↓
scored 2026-10-31 · rubric v0.25.0 · Show this score on your site →

0 APIs

Company OTP Authentication Multi-Channel Messaging

Kin Score

Kin Score How this is scored →
scored 2026-10-31 · rubric v0.25.0

Composite quality — 34.7/100 · thin

Contract Quality 8.3 / 21

Developer Ergonomics 8.1 / 17

Access Clarity 7.6 / 17

Operational Transparency 0.9 / 11

Contract Governance 0.0 / 10

Discoverability 4.1 / 9

Regulatory Posture 2.9 / 15

Agent readiness — 29/100 · agent ready

Machine-Readable Contract 18 / 18

Agentic Access Contract 0 / 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 0 / 7

Rate-Limit Signaling 0 / 7

Typed Event Surface 6 / 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

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):

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
Rate-Limit Signaling +7 pts — OpenAPI responses document X-RateLimit-* / RateLimit headers (verified), else a rate_limits artifact or RateLimits link (documented)
Request/Response Examples +7 pts — share of operations carrying request/response examples; else an Examples / Code Samples link
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)

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 39.0 — up to +15.3 composite points
Operational Transparency scores 7.9 — up to +12.0 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/secondfactor/apis.yml: open an issue on github.com/api-evangelist/secondfactor 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 →

Event Specifications 1

AsyncAPI definitions for this provider's event-driven and streaming APIs.

Secondfactor Webhooks

ASYNCAPI

Security Posture 2

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

Secondfactor Authentication

1 scheme

SECURITY

Secondfactor Domain Security

TLSv1.3 · DMARC

SECURITY

Resources

Get Started 2

Portal, sign-up, and the first successful call

GettingStarted

GettingStarted

SignUp

SignUp

Documentation 1

Reference material describing how the API behaves

Documentation

Documentation

Agent Surfaces 1

MCP servers, agent skills, and machine-readable catalogs

LLMsTxt

LLMsTxt

Design & Contract 2

Pagination, idempotency, versioning, errors, and events

Webhooks

Webhooks

ErrorCatalog

ErrorCatalog

Build 2

SDKs, sample code, and the tooling you integrate with

SDKs

SDKs

Packages

Packages

Access & Security 2

Authentication, authorization, and security posture

Authentication

Authentication

DomainSecurity

DomainSecurity

Operate 1

Status, limits, changes, and where to get help

Support

Support

Commercial 3

Pricing, plans, and the legal terms of use

Pricing

Pricing

TermsOfService

TermsOfService

PrivacyPolicy

PrivacyPolicy

Company 2

The organization behind the API

Website

Website

Blog

Blog

Other 2

Properties that don't map to a standard resource type

Hosts

Hosts

Vendors

Vendors

Source (apis.yml)

aid: secondfactor
name: SecondFactor
image: https://secondfactor.ai/assets/og-default.png
description: SecondFactor provides an OTP Delivery & Verification API that enables developers to send one‑time passwords via
  SMS, WhatsApp, Viber, and RCS. The platform intelligently routes messages to the lowest‑cost channel, offers automatic fallback,
  delivery logs, template management, and a pricing calculator. It aims to reduce authentication costs and improve user experience
  with a single, multi‑channel API. Documentation, pricing, and support are available online, and the service is trusted by
  global companies for secure, fast, and affordable OTP delivery.
url: https://raw.githubusercontent.com/api-evangelist/secondfactor/refs/heads/main/apis.yml
x-type: company
x-source: harvest:new-submission
x-tier: profiled
x-tier-reason: enrichment pass 2026-10-27 (modular-v1; was harvest)
specificationVersion: '0.20'
created: '2026-10-27'
modified: '2026-10-27'
tags:
- Company
- OTP
- Authentication
- Multi-Channel
- Messaging
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com
- FN: APIs.json
  email: info@apis.io
common:
- type: GettingStarted
  url: https://docs.secondfactor.ai/
- type: Webhooks
  url: asyncapi/secondfactor-webhooks.yml
- type: Authentication
  url: authentication/secondfactor-authentication.yml
- type: ErrorCatalog
  url: errors/secondfactor-problem-types.yml
- type: LLMsTxt
  url: llms/secondfactor-llms.txt
- type: Hosts
  url: hosts/secondfactor-hosts.yml
- type: Vendors
  url: vendors/secondfactor-vendors.yml
- type: SDKs
  url: packages/secondfactor-packages.yml
- type: Packages
  url: packages/secondfactor-packages.yml
- type: DomainSecurity
  url: security/secondfactor-domain-security.yml
- type: Website
  url: https://secondfactor.ai
- type: Documentation
  url: https://docs.secondfactor.ai
- type: Support
  url: https://secondfactor.ai/support
- type: Blog
  url: https://secondfactor.ai/blog
- type: Pricing
  url: https://secondfactor.ai/pricing
- type: SignUp
  url: https://app.secondfactor.ai/signup
- type: TermsOfService
  url: https://secondfactor.ai/terms
- type: PrivacyPolicy
  url: https://secondfactor.ai/privacy
apis: []
x-submission-notes: Reference docs docs.secondfactor.ai + SDKs; no public OpenAPI
x-submitted-by: marketing@secondfactor.ai (apis.io/add, 2026-10-26)
x-enrichment:
  date: '2026-10-27'
  status: enriched
  artifacts_added: 13
  pass: modular-v1
  engine: identity=local,contract=local,surfaces=local,docs=local,regulatory=local

SecondFactor API — frequently asked questions

How do I authenticate with the SecondFactor API?

SecondFactor uses bearer-token authentication (1 scheme). The details are profiled on APIs.io as Secondfactor Authentication.

Is the SecondFactor API ready for AI agents?

SecondFactor has a Kin Score of 34.7 out of 100 (thin) and an Agent Readiness score of 28.6 (agent-ready), scored by API Evangelist on 2026-10-31.

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get_provider_artifactsEvery artifact this provider publishes, grouped by type.
get_provider_operationsEvery operation across all of their OpenAPIs — one call instead of parsing every spec.
get_provider_toolsEvery MCP tool they ship, with the operation each wraps.
get_provider_evidenceHow each part of their score was established. Free — the basis for a claim should not sit behind it.
get_provider_ratingPRO — composite, band, trend and facet scores.
apis_io_searchSTART HERE — APIs, providers and tags for one query, each with its total.
resolveTurn a domain, URL or GitHub org into the provider it belongs to.
find_cohortsEvery scored population of providers in the catalog.

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