niche · -2.1 market domain

OTP

Score 19.3 / 100 17 providers +15 via APIs 20 APIs Search apis.io →
Workflows using this tag
Stytch SMS One-Time Passcode Login · Stytch Stytch B2B Create Organization and Invite Member · Stytch Stytch B2B Email OTP Discovery and Exchange · Stytch Stytch OAuth Authenticate and Session · Stytch Stytch User Create, Search, and Delete · Stytch Stytch Password Reset by Email · Stytch Stytch TOTP Authenticator Enrollment · Stytch Stytch B2B TOTP Authenticator Enrollment · Stytch
Business capabilities this tag reaches
Cybersecurity Management 5

Providers using this tag (17)

Ranked by API Evangelist rating — Exemplar and Strong are expanded by default.

Strong 3 Solid coverage with minor gaps
TempMailGrab APIEmailtemporary-emailDisposable Email1 API63.2UnifonicCompanyEnterpriseCPaaSMessaging3 APIs59.0JuriSignE-SignatureeIDASPDFWebhook1 API65.3
Developing 4 Usable, with meaningful gaps to close
KaleyraCPaaSMessagingSMSWhatsApp1 API43.3KeynuaCompanyE-SignatureDigital SignatureIdentity Verification1 API41.4Route MobileTelecommunicationsIndiaCPaaSMessaging5 APIs51.6CellulantPaymentsMobile MoneyCheckoutPayouts3 APIs50.1
Thin 1 Limited public surface area
Sinch Verification APINumber VerificationPhone Verification2FA1 API29.9
Emerging 7 Early or largely undocumented
PreludeNumber VerificationPhone VerificationAuthentication1 API25.4Telnyx Verify APINumber VerificationPhone Verification2FA1 API24.9TermiiMessagingSMSWhatsApp1 API24.9Power2SMECompanyMarketplaceSmall BusinessProcurement1 API23.2BICSNumber VerificationTelecommunicationsMobile IdentityFraud Prevention8 APIs22.2tyntecNumber VerificationCPaaSSMSWhatsApp1 API16.1Rakuten MobileTelecommunicationsMobile Network OperatorCarrier5G3 APIs11.3
Minimal 2 Almost no public developer surface
GetOTPPublic APIsAuthentication1 API5.6OCRAAuthenticationOCRASecurity3.1

APIs with this tag (20)

Ranked by the provider's API Evangelist rating — the Kin Score is scored per provider, not per API, so every API of a provider shares its band. How the rating works →

Strong 4 Solid coverage with minor gaps
CM.com OTP APIThe OTP API from CM.com — 5 operation(s) for otp.64.1Riskified OTP APIInitiate a one-time password challenge as a step-up verification mechanism for high-risk login, password re...61.6Stytch OTP APIThe OTP API from Stytch — 7 operation(s) for otp.60.4Swisscom Phone Number Validation APITwo-factor authentication API that starts an SMS token validation flow against an MSISDN and then verifies ...59.0
Developing 8 Usable, with meaningful gaps to close
MTN Group OTP APIThe OTP API from MTN Group — 2 operation(s) for otp.52.1Route Mobile OTP APIAPIs for OTP generation and verification.51.6Truecaller Non-Truecaller User Verification APIServer-side validation for the drop-call / IM-OTP verification flow that covers users without the Truecalle...49.41Kosmos OTP APIThe OTP API from 1Kosmos — 3 operation(s) for otp.49.2Toqio OTP APIThe OTP API from Toqio — 1 operation(s) for otp.47.2SecureAuth (incl. Cloudentity) OTP APIThe OTP API from SecureAuth (incl. Cloudentity) — 9 operation(s) for otp.46.3Keynua APIREST API for creating contracts, sending them to signers over WhatsApp/SMS/email, running biometric identit...41.4Fyno Verify APIOTP and TOTP-based verification API for authenticating users via SMS, email, or authenticator apps. Bundled...40.0
Thin 2 Limited public surface area
Plivo Verify APIThe Plivo Verify API delivers OTPs over SMS, voice, WhatsApp, or email and verifies user-supplied codes, su...38.9Authsignal Client APIBrowser / device-facing REST API for fully custom authentication UIs. Supports passkeys, authenticator apps...28.1
Emerging 6 Early or largely undocumented
IYK APIThe IYK API provides primitives for building digi-physical experiences. Core endpoints manage chips (NFC ta...25.8BICS Number Verification APIPhone number verification and mobile authentication for anti-fraud, KYC and onboarding - validating that a ...22.2PocketBase Authentication APIAuthentication endpoints supporting password-based login, OAuth2 providers, one-time passwords, token refre...17.4tyntec 2FA Authentication APIProgrammatic two-factor authentication and one-time passwords. Send an OTP to a recipient number (POST /otp...16.1TranZak SMS APIREST API for sending marketing bulk SMS messages and OTP/verification codes. Supports up to 500 recipients ...13.6Rakuten CPaaS Confirm (OTP) APIOne-time PIN delivery and verification API for two-factor authentication and transaction confirmation, with...11.3

Companies reaching this through an API (15)

These companies publish an API, specification or operation carrying “OTP” but do not classify their business under it. Listed unranked and kept out of the count above, because one tagged operation is not a statement about what a company does.

1Kosmos Authsignal CM.com Fyno IYK MTN Group Plivo PocketBase Riskified SecureAuth (incl. Cloudentity) Stytch Swisscom Toqio TranZak Truecaller

Score breakdown

Frequency
44.6
log-scaled weighted occurrences
Breadth
0.4
spread across providers
Quality lift
34.6
mean composite of providers using it
Cohesion
7.7
strength of nearest seed neighbor

Related tags

CPaaS 10 co-occurrences Number Verification 5 co-occurrences WhatsApp 7 co-occurrences SMS 15 co-occurrences Verification 7 co-occurrences Identity Verification 7 co-occurrences Messaging 12 co-occurrences Onboarding 5 co-occurrences

Where this tag comes from

Api tag20
Provider tag17
Openapi tag6
Openapi op tag24

Work with this as data

Every tag here is available over the APIs.io API and to AI agents over MCP.

MCP server

One button, every client — Claude, Cursor, VS Code and the rest.

https://apis.io/mcp

Tools for tags

7 MCP tools reach this
  • find_tagsBrowse and filter every tag in the catalog.
  • get_cohortThis tag as a scored cohort — every provider carrying it, with scores.
  • cohort_statsPRO — the distribution across this tag: mean, median, band split, adoption rates.
  • cohort_rankingsPRO — the leaderboard, on composite AND agent-readiness axes.
  • 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.
All 92 tools →

Call it yourself

curl for this page
This tag 
curl "https://apis.io/api/v1/tags/otp"
All tags 
curl "https://apis.io/api/v1/tags?limit=25"
As a scored cohort 
curl "https://apis.io/api/v1/cohorts/tag/otp"
The distribution (Pro) 
curl "https://apis.io/api/v1/cohorts/tag/otp/stats" \
  -H "X-API-Key: $APIS_IO_KEY"

Discovery needs no key. Ratings and market analysis are Pro.

Get an API key

Free tier, no form to fill in. Signing in shares your email address with us — we store it to create your key and to recognise you if you sign in with another provider. See our Privacy Policy and Terms.

GitHub Google LinkedIn

A second provider on the same verified email joins the account you already have.