established · 1.1

Calls

Score 29.2 / 100 68 providers 71 APIs Search apis.io →
Variants seen in the corpus: Callscalls

Providers using this tag (68)

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

Exemplar 4 Complete, well-documented, and agent-ready
VapiArtificial IntelligenceVoice AIVoice AgentsConversational AI15 APIs75.1TwilioAuthenticationCommunicationsContact CenterEmail115 APIs73.4LeadpingLead ManagementSales & marketing automationSMS MessagingA2P 10DLC29 APIs72.2VesselCRMChatDialerEmbedded Integrations20 APIs72.1
Strong 27 Solid coverage with minor gaps
GongSalesRevenue IntelligenceConversationAnalytics26 APIs66.4FactsetFinancialFinancial DataInvestment AnalyticsMarket Data460 APIs64.8Apollo.ioSales IntelligenceProspectingEngagementB2B Data14 APIs64.2AmigoCompanyArtificial IntelligenceHealthcareAI Agents72 APIs63.8SlackBotsChatCollaborationMessaging115 APIs62.3Apollo API DocumentationAPI DocumentationSales IntelligenceData EnrichmentPeople Search14 APIs61.8SynthflowVoiceVoice AgentsNo-CodeTelephony8 APIs61.8ShopifyCommerceE-CommercePaymentsRetail213 APIs60.4SalesloftSalesSales EngagementCadencesCRM85 APIs59.6The Mobile First CompanyCompanyCommunicationsTelephonyVoice13 APIs59.1CloudTalkCompanyCommunicationsVoiceVoIP13 APIs59.0CoperniqCompanyClimateSolarConstruction28 APIs58.1ZendeskChatCRMHelp CenterSell150 APIs58.1SalesflareCRMSalesB2BContacts20 APIs57.5SLNGCompanySpeechVoiceSpeech-to-Text15 APIs56.9SinchCommunicationsMessagingSMSVoice35 APIs56.5CallRailCall TrackingConversation IntelligenceMarketing AttributionLead Tracking4 APIs56.4Beyond PresenceCompanyAi Enterprise SoftwareArtificial IntelligenceAvatars7 APIs56.1BandwidthCommunicationsCPaaSVoiceMessaging18 APIs55.3BemCompanyDocument ProcessingUnstructured DataData Extraction22 APIs55.2OpenPhoneCompanyCommunicationsVoiceSMS9 APIs55.0VOYGRCompanyLocation IntelligencePOI DataData Enrichment2 APIs55.0BenzingaFinancialMarket DataStocksNews44 APIs54.9NooksCompanyArtificial IntelligenceSales EngagementSales Dialer2 APIs54.9GrafanaAlertingAnalyticsDashboardsLogs138 APIs54.8Microsoft Office 365CloudCollaborationEnterpriseMicrosoft12 APIs54.8VoiceGenieCompanyVoice AIConversational AISales Automation2 APIs54.3
Developing 16 Usable, with meaningful gaps to close
ServiceTitanField Service ManagementTradesHVACPlumbing55 APIs53.5Microsoft TeamsChatCollaborationCommunicationsMicrosoft-36511 APIs52.9Vanilla ForumsCommunityForumsCommunity ManagementWebhook58 APIs51.0QuoCompanyCommunicationsMessagingSMS9 APIs50.9FixieCompanyVoice AIConversational AIReal-Time14 APIs49.8AndoCompanyBusiness ApplicationsMessagingTeam Collaboration8 APIs48.1Sendbird7 APIs48.0AvocaCompanyArtificial IntelligenceVoice AIConversational AI8 APIs44.0PlivoCommunicationsCPaaSVoiceSMS24 APIs44.0AgentPhoneCompanyTelephonyPhone NumbersSMS13 APIs43.1CartesiaArtificial IntelligenceVoice AIText-to-SpeechSpeech-to-Text21 APIs43.0VeritusCompanyFintechConsumer LendingCollection4 APIs42.1ButterflyMXAccess Controlphysical-accesssmart-intercomPropTech14 APIs41.5Cisco ExpresswayCollaborationFirewall TraversalH.323Session Border Controller18 APIs41.3Root InsuranceInsuranceAuto InsuranceTelematicsEmbedded Insurance18 APIs40.6FrontCustomer-SupportEmailInboxCustomer Operations39 APIs39.6
Thin 20 Limited public surface area
LayercodeArtificial IntelligenceVoiceVoice AgentsReal-Time5 APIs37.9VocodeVoice AIVoice AgentsTelephonyConversational AI9 APIs37.6Weights and BiasesMLOpsExperiment TrackingLLM ObservabilityModel Registry16 APIs36.7TelefonieCall RecordingCPaaSMessagingNumber Provisioning6 APIs36.0Windstream HoldingsBroadbandContact CenterManaged ServiceNetwork Communications9 APIs35.3TelefonCall RecordingCommunicationsCPaaSGlobal Coverage7 APIs35.1TelefoonBelgiumCPaaSEU Data ResidencyEurope5 APIs35.0JustCallVoiceSMSCloud PhoneContact Center4 APIs34.846elksCPaaSSMSMMSVoice5 APIs33.4TenfoldCompanyCTIContact CenterTelephony8 APIs33.0Sarj AI Developer APIVoice AIVoice AgentsConversational AIArabic AI27 APIs32.9messagebird19 APIs32.7FreshsalesCRMSalesContactsDeals13 APIs32.4AircallCommunicationsVoiceCloud PhoneCRM16 APIs31.7freshworks44 APIs31.6VapiArtificial IntelligenceVoiceAgentsReal-Time16 APIs30.9Weights & BiasesMLMLOpsExperiment TrackingModel Registry11 APIs30.8DialpadCommunicationsVoiceArtificial IntelligenceContact Center16 APIs30.7Bland AIArtificial IntelligenceVoiceAgentsPhone2 APIs30.0Samora AICompanyVoice AgentsConversational AIVoice AI3 APIs29.0
Emerging 1 Early or largely undocumented
Follow Up BossReal-EstateCRMLead ManagementSales Automation9 APIs21.7

APIs with this tag (71)

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 4 Complete, well-documented, and agent-ready
Vapi Calls APICalls endpoints.75.1Twilio Calls APIInitiate, manage, and monitor voice calls73.4Leadping Calls APIManages outbound Leadping calls and active call-control workflows. Use these endpoints to initiate or cance...72.2Vessel Dialer Unified APIThe Vessel Dialer Unified API normalizes telephony/dialer objects across Aircall, Dialpad and RingCentral u...72.1
Strong 29 Solid coverage with minor gaps
Gong Calls APIOperations for managing and retrieving call data66.4Factset Calls APIThe Calls API from Factset — 1 operation(s) for calls.64.8Apollo.io Calls APIPhone-call records — log, search and update dialer activity. 3 operation(s) from the published Apollo OpenAPI.64.2Amigo Calls APIThe Calls API from Amigo — 10 operation(s) for calls.63.8Slack Calls APIThe Calls API from Slack — 6 operation(s) for calls.62.3Apollo API CallsLog and update call records made inside or outside Apollo. Harvested from the Apollo-published OpenAPI 3.1 ...61.8Synthflow Platform APIThe Synthflow Platform API provides REST endpoints to manage assistants, phone numbers, calls, knowledge ba...61.8Shopify Calls APIThe Calls API from Shopify — 2 operation(s) for calls.60.4Salesloft Calls API[https://developer.salesloft.com/docs/api/calls/](https://developer.salesloft.com/docs/api/calls/)59.6The Mobile First Company Calls APIRetrieve and search call records with filtering and pagination. Filter calls by your Allo phone number.59.1CloudTalk Calls APIAll data you can get about your calls.59.0Coperniq calls APIThe calls API from Coperniq — 3 operation(s) for calls.58.1Zendesk Sell Calls APIThe Zendesk Sell Calls API lets you create, read, and delete call records in your CRM. Calls can be associa...58.1Salesflare Calls APIThe Calls API from Salesflare — 2 operation(s) for calls.57.5SLNG Calls APICall dispatch and status.56.9Sinch Calls APIManage ongoing calls or retrieve information about a call. Supports updating call properties and hanging up...56.5CallRail Calls APIThe Calls API from CallRail — 6 operation(s) for calls, including summary and time series reporting.56.4CallRail v3 APIREST API providing programmatic access to CallRail accounts, companies, tracking numbers, calls, text messa...56.4Beyond Presence Calls APIThe Calls API from Beyond Presence — 3 operation(s) for calls.56.1Bandwidth Calls APICreate, retrieve, and manage phone calls. Supports outbound call creation, call state queries, and in-progr...55.3Bem Calls APIThe Calls API provides a unified interface for invoking both **Workflows** and **Functions**. Use this API ...55.2OpenPhone Calls APIOperations related to calls55.0Voygr Calls APIProgrammatic outbound phone calls executed by an AI voice agent. Submit a task either as a plain-language b...55.0Benzinga calls APIThe calls API from Benzinga — 2 operation(s) for calls.54.9Benzinga Earnings Call Transcripts APIReal-time and historical conference-call transcripts, audio, AI-generated summaries, and speaker data, fetc...54.9Nooks Sequencing APIThe Nooks Sequencing API (also published as the "Nooks External API") provides programmatic access to seque...54.9Grafana Calls APIThe Calls API from Grafana — 2 operation(s) for calls.54.8Microsoft Graph Communications APICreate and join online meetings, manage call records, and enable cloud communications capabilities for appl...54.8VoiceGenie Calls APIPlace and track voice calls.54.3
Developing 16 Usable, with meaningful gaps to close
ServiceTitan Telecom APIRetrieve inbound and outbound call records, call recordings, call analytics, and call reasons. Powers Conta...53.5Microsoft Teams Calls APIOperations for initiating and managing calls.52.9Vanilla Forums Calls APIThe Calls API from Vanilla Forums — 1 operation(s) for calls.51.0Quo Calls APIOperations related to calls50.9Fixie calls APIThe calls API from Fixie — 13 operation(s) for calls.49.8Ando Calls APICall detail and transcript routes.48.1Sendbird Calls APIThe Sendbird Calls API provides voice and video calling capabilities, enabling real-time one-on-one and gro...48.0Avoca Calls APICall records, transcripts, and pre-call transfers44.0Plivo Voice Call APIThe Plivo Voice Call API initiates outbound calls, retrieves details for live and historical calls, and sup...44.0AgentPhone calls APIThe calls API from AgentPhone — 8 operation(s) for calls.43.1Cartesia Calls APIOutbound call placement, batching, and history.43.0Veritus Calls APIThe Calls API from Veritus — 2 operation(s) for calls.42.1ButterflyMX Calls APIThe Calls API from ButterflyMX — 2 operation(s) for calls.41.5Cisco Expressway Calls APIActive and historical call information41.3Root Insurance Calls APIThe Calls API from Root Insurance — 4 operation(s) for calls.40.6Front Calls APIThe Calls API from Front — 5 operation(s) for calls.39.6
Thin 21 Limited public surface area
Layercode Calls APIThe Calls API from Layercode — 1 operation(s) for calls.37.9Vocode Calls APIThe Calls API from Vocode — 5 operation(s) for calls.37.6Weights and Biases Calls APIThe Calls API from Weights and Biases — 8 operation(s) for calls.36.7Telefonie Calls APIMake and manage voice calls36.0Windstream Holdings calls APICall management and control35.3Telefon Calls APIMake and manage phone calls35.1Telefoon Calls APIMake and manage voice calls35.0JustCall Calls APIManage and query voice calls handled through JustCall.34.846elks Calls APIMake and receive programmable voice calls.33.4Tenfold Calls APIOriginate, query, control, and update calls33.0Sarj AI Developer API Calls APICreate outbound voice calls and retrieve call details and transcripts.32.9messagebird Calls APIOperations for creating, listing, and managing voice calls.32.7Freshsales Calls APIThe Calls API from Freshsales — 1 operation(s) for calls.32.4Aircall Calls APIThe Calls API from Aircall — 7 operation(s) for calls.31.7freshworks Calls APIAccess call records, call details, and call metrics from the Freshcaller system.31.6Vapi Calls APIThe Calls API from Vapi — 2 operation(s) for calls.30.9Weights & Biases Calls APIThe Calls API from Weights & Biases — 8 operation(s) for calls.30.8Dialpad Calls APIThe Calls API from Dialpad — 7 operation(s) for calls.30.7Bland AI Calls APISend, list, retrieve, and stop AI phone calls.30.0Bland AI Platform APIREST API for sending and managing AI phone calls, pathways (conversation flows), voices and voice clones, p...30.0Samora AI Calls APITrigger and retrieve individual outbound calls.29.0
Emerging 1 Early or largely undocumented
Follow Up Boss Calls APIThe Calls API from Follow Up Boss — 2 operation(s) for calls.21.7

Score breakdown

Frequency
61.1
log-scaled weighted occurrences
Breadth
1.9
spread across providers
Quality lift
59.0
mean composite of providers using it
Cohesion
10.9
strength of nearest seed neighbor

Related tags

Telephony 22 co-occurrences Phone Numbers 15 co-occurrences Conversations 18 co-occurrences Numbers 8 co-occurrences Voice Agents 9 co-occurrences Recordings 10 co-occurrences Voice 26 co-occurrences CPaaS 10 co-occurrences

Where this tag comes from

Api tag71
Openapi tag54
Openapi op tag241

Cohort brief

Auto-generated

The 68 providers in the APIs.io catalog tagged Calls, scored on the Kin Score. Every figure below is computed from the catalog — nothing here is written.

Providers
68
all scored
Mean Kin Score
48.4
+27.7 vs catalog 20.7
Mean Agent Readiness
31
+21.3 vs catalog 9.7
Spread
21.7–75.1
median 51 · σ 12.9
How the 68 split by band
Exemplar 4Strong 27Developing 16Thin 20Emerging 1Minimal 0
Facet averages, against the whole catalog
FacetThis cohortCatalogDifferenceScored
Contract Quality 60.9 17.5 +43.4 68
Developer Ergonomics 47.7 17.9 +29.8 68
Operational Transparency 33.8 11.3 +22.5 68
Access Clarity 43.4 22.3 +21.1 68
Discoverability 76.6 60.4 +16.2 68
Contract Governance 20.4 6.4 +14 68

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) 57% 16% +41
MCP server (first-party) 31% 7% +24
Agent Skills 0% 0% 0
OAuth scopes 28% 9% +19
Security 100% 88% +12
Arazzo workflows 15% 2% +13
Governance rules 44% 13% +31

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 Vapi 75.1
  2. 2 Twilio 73.4
  3. 3 Leadping 72.2
  4. 4 Vessel 72.1
  5. 5 Gong 66.4
  6. 6 Factset 64.8
  7. 7 Apollo.io 64.2
  8. 8 Amigo 63.8
  9. 9 Slack 62.3
  10. 10 Apollo API Documentation 61.8
Top by Agent Readiness
  1. 1 Sarj AI Developer API 60.4
  2. 2 Apollo.io 55.3
  3. 3 The Mobile First Company 52.9
  4. 4 Factset 52.8
  5. 5 Nooks 51.1
  6. 6 AgentPhone 48.9
  7. 7 Salesloft 47.9
  8. 8 Gong 46.1
  9. 9 Amigo 43.5
  10. 10 Salesflare 43.2
All 68 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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