emerging · 0.4 market domain

OTP

Score 22.3 / 100 30 providers 21 APIs Search apis.io →

Providers using this tag (30)

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

Exemplar 1 Complete, well-documented, and agent-ready
8x8TelecommunicationsUnited StatesCPaaSUCaaS36 APIs67.1
Strong 6 Solid coverage with minor gaps
SwisscomTelecommunicationsSwitzerlandMobile Network OperatorBroadband13 APIs63.8UnifonicCompanyEnterpriseCPaaSMessaging8 APIs59.7InsiderCompanyCustomer EngagementPersonalizationCustomer Data Platform19 APIs57.6KaleyraCPaaSMessagingSMSWhatsApp6 APIs57.4Route MobileTelecommunicationsIndiaCPaaSMessaging6 APIs57.2CellulantPaymentsMobile MoneyCheckoutPayouts6 APIs54.7
Developing 11 Usable, with meaningful gaps to close
1KosmosIdentityAuthenticationIdentity VerificationPasswordless10 APIs51.8StytchAuthenticationIdentityPasswordlessSecurity47 APIs51.4FynoNotificationMessagingCommunicationsPush Notifications10 APIs50.4ToqioEmbedded FinanceFintechBanking as a ServicePayments49 APIs48.5TruecallerCompanyConsumerCaller IDPhone Verification4 APIs48.0TMT IDTelecommunicationsUnited KingdomIdentity VerificationMobile Identity7 APIs46.7PlivoCommunicationsCPaaSVoiceSMS24 APIs44.0KeynuaCompanyElectronic SignatureDigital SignatureIdentity Verification1 API42.4TelesignAuthenticationCommunicationsFraud PreventionPhone Intelligence5 APIs40.1Sinch Verification APINumber VerificationPhone Verification2FA3 APIs39.7AuthsignalAuthenticationPasskeysMFAStep-Up22 APIs39.3
Thin 6 Limited public surface area
Telnyx Verify APINumber VerificationPhone Verification2FA3 APIs36.7PreludeNumber VerificationPhone VerificationAuthentication4 APIs35.2RiskifiedFraudFraud PreventionChargebacksE-Commerce7 APIs34.7PocketBaseBackend-as-a-ServiceOpen-SourceSQLiteReal-Time5 APIs34.4TermiiMessagingSMSWhatsApp6 APIs33.6Power2SMECompanyMarketplacesSMEProcurement17 APIs26.4
Emerging 4 Early or largely undocumented
tyntecNumber VerificationCPaaSSMSWhatsApp7 APIs24.8IYKCompanyNFCPhygitalBlockchain1 API24.0BICSNumber VerificationTelecomMobile IdentityAnti-Fraud24 APIs22.2TranZakFintechMobile MoneyPaymentsAfrica4 APIs19.4
Minimal 2 Almost no public developer surface
Rakuten MobileTelecommunicationsMobile Network OperatorCarrier5G3 APIs7.9OCRAAuthenticationOCRASecurity5.5

APIs with this tag (21)

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 →

Exemplar 1 Complete, well-documented, and agent-ready
Verification API8x8 Verification API for generating and validating SMS- and voice-based one-time passcodes for mobile numbe...67.1
Strong 3 Solid coverage with minor gaps
Swisscom Phone Number Validation APITwo-factor authentication API that starts an SMS token validation flow against an MSISDN and then verifies ...63.8Insider One Verify (OTP) APIOne-time-passcode channels and templates for SMS and WhatsApp: create and update channels, manage OTP templ...57.6Route Mobile SMS APIRoute Mobile's core A2P SMS platform — single, bulk, scheduled and personalised SMS submission over HTTPS, ...57.2
Developing 10 Usable, with meaningful gaps to close
1Kosmos OTP APIThe OTP API from 1Kosmos — 3 operation(s) for otp.51.8Stytch OTP APIThe OTP API from Stytch — 7 operation(s) for otp.51.4Fyno Verify APIOTP and TOTP-based verification API for authenticating users via SMS, email, or authenticator apps. Bundled...50.4Toqio OTP APIThe OTP API from Toqio — 1 operation(s) for otp.48.5Truecaller Non-Truecaller User Verification APIServer-side validation for the drop-call / IM-OTP verification flow that covers users without the Truecalle...48.0TMT Authenticate APISilent Network Authentication and OTP fallback. The client exchanges HTTP Basic credentials at /oauth/token...46.7Plivo Verify APIThe Plivo Verify API delivers OTPs over SMS, voice, WhatsApp, or email and verifies user-supplied codes, su...44.0Keynua APIREST API for creating contracts, sending them to signers over WhatsApp/SMS/email, running biometric identit...42.4Telesign Voice APISend voice messages including OTPs, alerts, and notifications to phone numbers worldwide. Supports text-to-...40.1Authsignal Client APIBrowser / device-facing REST API for fully custom authentication UIs. Supports passkeys, authenticator apps...39.3
Thin 2 Limited public surface area
Riskified OTP APIInitiate a one-time password challenge as a step-up verification mechanism for high-risk login, password re...34.7PocketBase Authentication APIAuthentication endpoints supporting password-based login, OAuth2 providers, one-time passwords, token refre...34.4
Emerging 4 Early or largely undocumented
tyntec 2FA Authentication APIProgrammatic two-factor authentication and one-time passwords. Send an OTP to a recipient number (POST /otp...24.8IYK APIThe IYK API provides primitives for building digi-physical experiences. Core endpoints manage chips (NFC ta...24.0BICS Number Verification APIPhone number verification and mobile authentication for anti-fraud, KYC and onboarding - validating that a ...22.2TranZak SMS APIREST API for sending marketing bulk SMS messages and OTP/verification codes. Supports up to 500 recipients ...19.4
Minimal 1 Almost no public developer surface
Rakuten CPaaS Confirm (OTP) APIOne-time PIN delivery and verification API for two-factor authentication and transaction confirmation, with...7.9

Score breakdown

Frequency
42.8
log-scaled weighted occurrences
Breadth
0.8
spread across providers
Quality lift
50.4
mean composite of providers using it
Cohesion
9.0
strength of nearest seed neighbor

Related tags

A2P 5 co-occurrences CPaaS 10 co-occurrences 2FA 5 co-occurrences Number Verification 5 co-occurrences WhatsApp 8 co-occurrences Anti-Fraud 5 co-occurrences SMS 16 co-occurrences Verification 9 co-occurrences

Where this tag comes from

Api tag21
Provider tag14
Openapi tag3
Openapi op tag6

Cohort brief

Auto-generated

The 30 providers in the APIs.io catalog tagged OTP, scored on the Kin Score. Every figure below is computed from the catalog — nothing here is written.

Providers
30
all scored
Mean Kin Score
40.8
+20.1 vs catalog 20.7
Mean Agent Readiness
23.4
+13.7 vs catalog 9.7
Spread
5.5–67.1
median 41.3 · σ 15.4
How the 30 split by band
Exemplar 1Strong 6Developing 11Thin 6Emerging 4Minimal 2
Facet averages, against the whole catalog
FacetThis cohortCatalogDifferenceScored
Contract Quality 45.7 17.5 +28.2 30
Developer Ergonomics 42.5 17.9 +24.6 30
Operational Transparency 32 11.3 +20.7 30
Discoverability 74.6 60.4 +14.2 30
Access Clarity 36.1 22.3 +13.8 30
Contract Governance 11.7 6.4 +5.3 30

A facet is averaged over the members that carry it, not over the whole cohort — the “Scored” column is that count. Averaging an absent facet as zero would score our own coverage gaps as the providers’ posture.

What this cohort publishes
ArtifactThis cohortCatalogDifference
MCP server (any) 47% 16% +31
MCP server (first-party) 3% 7% -4
Agent Skills 0% 0% 0
OAuth scopes 20% 9% +11
Security 97% 88% +9
Arazzo workflows 7% 2% +5
Governance rules 17% 13% +4

mcp_pct counts any mcp/ artifact including ones API Evangelist derived from the provider OpenAPI; mcp_first_party_pct counts only servers the provider publishes. Prefer the latter.

Top by Kin Score
  1. 1 8x8 67.1
  2. 2 Swisscom 63.8
  3. 3 Unifonic 59.7
  4. 4 Insider 57.6
  5. 5 Kaleyra 57.4
  6. 6 Route Mobile 57.2
  7. 7 Cellulant 54.7
  8. 8 1Kosmos 51.8
  9. 9 Stytch 51.4
  10. 10 Fyno 50.4
Top by Agent Readiness
  1. 1 Swisscom 48
  2. 2 Insider 46.4
  3. 3 8x8 43.3
  4. 4 Stytch 36.9
  5. 5 Route Mobile 35.8
  6. 6 TMT ID 34
  7. 7 Toqio 33.6
  8. 8 Truecaller 33.1
  9. 9 BICS 30.6
  10. 10 1Kosmos 30.4
All 30 members of this roster resolve to a scored provider in the catalog.Generated from the catalog build of 25 August 2026, across 26891 providers, using the same computation served by the APIs.io cohort API. Briefs are published for rosters of 5 or more scored providers; below that a distribution is not meaningful.

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  • 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

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The distribution (Pro) 
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