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 17 Complete, well-documented, and agent-ready

HubSpot Leads APIThe leads API enables you to manage lead records in HubSpot. Leads are contacts or companies that are poten...91.6 Adobe Marketo Engage APIAutomate marketing processes and manage leads, campaigns, and assets via REST APIs.80.4 Zoho CRM Leads APIThe Leads API from Zoho CRM — 3 operation(s) for leads.78.1 Cvent Leads API* **Leads -** Leads include leads gathered by LeadCapture, Appointments, and Inbound Leads. Use this API to...78.0 Cvent Registration Leads API* **Leads -** Leads include leads gathered by LeadCapture, Appointments, and Inbound Leads. Use this API to...76.9 Close Leads APIThe leads API from Close — 3 operation(s) for leads.75.3 Leadping Leads APIManages lead intake, records, assignment, routing, and lifecycle operations. Use these endpoints to ingest ...74.9 lemlist Leads APILeads inside campaigns - create with optional enrichment, update, pause, resume, mark interested, custom va...73.2 Zendesk Sell Leads APIThe Zendesk Sell Leads API provides a simple interface to manage leads. A lead represents an individual or ...72.2 Cvent Event Cloud Leads API* **Leads -** Leads include leads gathered by LeadCapture, Appointments, and Inbound Leads. Use this API to...71.9 Hunter Leads APIManage leads stored in Hunter.71.9 Microsoft Dynamics 365 Sales Leads APISales lead records70.7 Microsoft Leads APIManage leads69.2 Unbounce Leads APILead submissions captured by pages68.5 Unbounce REST APIREST API for Unbounce providing programmatic access to accounts, sub-accounts, domains, pages, page groups,...68.5 ServiceNow Lead APIThe ServiceNow Lead API provides REST endpoints to create, update, and retrieve marketing leads and their a...67.5 Qualified Leads APICreate, update, and read lead (person) records and their custom field values.66.8

Strong 17 Solid coverage with minor gaps

Instantly Lead APIA lead entity representing an individual lead66.0 Cvent Hospitality Cloud Leads API* **Leads -** Leads include leads gathered by LeadCapture, Appointments, and Inbound Leads. Use this API to...65.6 Zoho Leads APIThe Leads API from Zoho — 3 operation(s) for leads.65.1 Vessel Leads APIThe leads API from Vessel — 5 operation(s) for leads.64.0 Hustle Leads APIThe Leads API from Hustle — 1 operation(s) for leads.62.9 Sense Talent Labs Lead APIA new prospective client or contact62.5 Smartlead Leads APIManage leads and prospects across campaigns61.0 Smartlead Leads APIEndpoints to add leads to a campaign in bulk, fetch leads, update lead status (interested, replied, unsubsc...61.0 Nutshell Leads APISales opportunities: create, read, update, close, reopen, watch, stage and stageset assignment, installment...60.6 Zendesk Sell (Sales CRM) APIOAuth 2.0-authenticated REST API for managing leads, contacts, deals, accounts, notes, tasks, calls, source...60.5 Zendesk Sell Leads APIPre-qualified sales prospects.60.5 Apideck Leads APIThe Lead resource represents individuals or businesses that have shown interest in a company's products or ...58.3 Supaglue Leads APIThe `Lead` Common Object represents a "potential customer" in CRMs.57.9 Pipeliner CRM Lead APIThe Lead API from Pipeliner CRM — 5 operation(s) for lead.57.8 Marketo Leads APILeads Controller57.3 LeadSquared Leads APILead create, get, and search54.3 Makinari REST APICore Makinari platform API covering Visitors (tracking and identification), Finder (contact and company sea...54.3

Developing 36 Usable, with meaningful gaps to close

Thin 26 Limited public surface area

Anywhere Agent Recruiting APIAn endpoint for third-party CRM integration partners to deliver recruiting activities into Anywhere's iPros...38.9 Anywhere Leads Engine APIHandles ingestion, routing and assignment of leads for Anywhere brands. Listed on the developer portal home...38.9 Anywhere Leads Management APIPowers third-party CRM applications to sync lead data with Anywhere source systems so agents can manage lea...38.9 Anywhere Referral Leads APISubmit a new lead to Anywhere's referral platform for a specific real estate referral program and share sta...38.9 Anywhere Referral Partner Integration APISubmit a new lead to Anywhere's referral platform for a specific real estate referral program, creating a c...38.9 REALTOR.ca Lead APICreate Lead38.2 Brightcove Leads APIGet leads for a Video Cloud account.37.2 Chatbase Leads APIRetrieve leads captured by a chatbot.37.1 Phorest Leads APIMarketing leads and lead statistics.36.7 Thumbtack Leads APIThe Leads API from Thumbtack — 2 operation(s) for leads.35.6 SmartMoving Leads APISales pipeline leads and their statuses.35.1 Apex27 Leads APIInbound leads and their pipeline status.33.4 Eruditus Leads APIEnrollment lead submission.33.2 Wodify Leads APIProspective members and their conversion to clients.33.0 AlterEstate Leads APIInbound lead submission into the CRM32.7 RealSelf Lead SharingRealSelf Lead Sharing publishes a notification to a partner-owned HTTPS endpoint every time a new patient l...31.8 USADATA Leads Engine Service (SOAP)Publicly served SOAP 1.1 / 1.2 web service behind the USADATA Leads Portal and Leads Module. The WSDL is se...31.4 Allianz Leads APIOperations for submitting insurance leads to the Allianz sales team31.3 Workiz Leads APIProspective work that can be converted into jobs.31.1 Swapcard Exhibitor Leads APIExhibitor-facing GraphQL API to list accessible booths (myExhibitors), export event leads with cursor pagin...30.1 Realtor.com Connections Plus APIThe Realtor.com Connections Plus API provides a direct connection between the Realtor.com lead delivery sys...29.9 Realtor.com Lead Delivery APIThe Realtor.com Lead Delivery API is an end-to-end integration layer that delivers real estate leads direct...29.9 DealerSocket CRM & Leads APILead and CRM integration surface. Includes the outbound Lead Forwarding Service (forwards incoming and proc...29.3 Insightly Leads APIThe Leads API from Insightly — 1 operation(s) for leads.28.2 Insightly REST API v3.1REST API for managing contacts, organizations, leads, opportunities, projects, tasks, events, products, pri...28.2 CoworkingView API Leads APIThe leads API from CoworkingView API — 2 operation(s) for leads.27.7

Emerging 13 Early or largely undocumented

AgencyZoom Leads APIThe Leads API from AgencyZoom — 8 operation(s) for leads.25.5 You've Got Leads APIThe integration surface of You've Got Leads, the senior-living CRM that is a division of A Place for Mom, I...24.7 Lane API Lead APIThe Lead API from Lane API — 3 operation(s) for lead.22.2 Ki Insurance Leads APIThe Leads API from Ki Insurance — 3 operation(s) for leads.21.5 Glofox Leads APICapture prospective members as leads and convert them into paying members through the "Lead Sale" integrati...21.2 Glofox Members APIAccess, create, and edit member records - the central pivot of the Glofox data model, spanning leads, activ...21.2 Hostfully REST APIHostfully Property Management Platform REST API v3.x covering properties (single and multi-unit), leads (in...18.9 Follow Up Boss APIREST API for managing real estate leads, contacts, deals, notes, tasks, calls, text messages, events, and w...18.6 OnTheMarket Real Time Datafeed (RTDF) APIOnTheMarket's member-only feed API for estate-agency CRM software. It is modelled on the Rightmove Real Tim...16.4 FranConnect Franchise Sales APIFranchise Sales / Development module (path segment "fs"). Import and export franchise development leads, pr...16.0 Angi Leads Delivery (Webhook) APINot a self-serve public API - there is no published base URL, API reference, or API key signup. Once a pro ...14.2 Contractor Foreman Zapier Automation APIA private, account-scoped REST API reached with an API key generated under Settings > Integration > Zapier,...11.5 HomeLight Partner APIPartner-gated REST API for submitting buyer and seller leads to HomeLight, submitting Simple Sale cash-offe...11.0

Minimal 1 Almost no public developer surface

MoveitPro Leads APISales leads captured from websites, lead providers, and Zillow. Modeled from the documented MoveitPro Zapie...5.3

Companies reaching this through an API (86)

These companies publish an API, specification or operation carrying “Leads” 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.

A Place for Mom Adobe AgencyZoom Allianz AlterEstate Alto (Vebra / Zoopla) Apex27 Apideck AutoLeadStar Avoca Bold Penguin Brightcove Broadlume Buildxact Chatbase Close Contractor Foreman Conversica CoworkingView API CREA (REALTOR.ca) Cvent Cvent Event Cloud Cvent Hospitality Cloud Cvent Registration Even Financial Facebook Lead Ads Fixture Flowise Follow Up Boss FranConnect Freshworks HomeLight Hostfully Housecall Pro HubSpot Hunter Hustle Insightly Instantly Ki Insurance Lane API LastDatabase Leadping LeadSquared lemlist LendKey Marketo Microsoft Microsoft Dynamics 365 Microsoft Dynamics 365 Sales

Show all 86 companies ↓

Mob.ly MoveitPro Nimble Nomos Nutshell OnTheMarket Oracle Fusion Cloud Applications PersistIQ Phorest Pipedrive Pipeliner CRM Proton.ai Qualified RealSelf Realtor REALTOR.ca Rentberry Root Insurance Sense Talent Labs ServiceNow ServiceTitan Smartlead SmartMoving Supaglue Swapcard Unbounce Uncodie (now Makinari) Unstoppable Domains Vessel WeTravel Wodify Workiz Zendesk Zillow Group Zoho Zoho CRM

Score breakdown

Frequency

63.3

log-scaled weighted occurrences

Breadth

0.5

spread across providers

Quality lift

39.1

mean composite of providers using it

Cohesion

11.8

strength of nearest seed neighbor

Where this tag comes from

Api tag111

Provider tag18

Openapi tag54

Openapi op tag203

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/leads"

All tags

curl "https://apis.io/api/v1/tags?limit=25"

As a scored cohort

curl "https://apis.io/api/v1/cohorts/tag/leads"

The distribution (Pro)

curl "https://apis.io/api/v1/cohorts/tag/leads/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.

Leads

Providers using this tag (18)

APIs with this tag (110)