established · 3.0 market domain

Custom Fields

Score 29.4 / 100 94 providers 95 APIs Search apis.io →
Business capabilities this tag reaches
Media Asset Management 1
Variants seen in the corpus: Custom FieldsCustom fieldsCustomFieldscustom-fields

Providers using this tag (94)

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

Exemplar 9 Complete, well-documented, and agent-ready
KitEmail MarketingCreator EconomySubscribersAutomation1 API82.5HubSpotAnalyticsCommerceContentCRM25 APIs80.4SendGridEmailEmail APIMarketing EmailSMTP44 APIs75.5AWeberEmail MarketingMarketing AutomationEmailNewsletters4 APIs72.5BirdeyeReputation ManagementReviewsCustomer ExperienceSurveys2 APIs70.9Cvent Event CloudAttendee HubAttendeesBulkContacts2 APIs70.4GetResponseEmail MarketingMarketing AutomationLanding PagesWebinars50 APIs70.2RemoteGlobal PayrollEORContractor ManagementContractor of Record8 APIs69.2AsanaCollaborationProductivityProject ManagementProject3 APIs66.5
Strong 20 Solid coverage with minor gaps
Common RoomCommunity IntelligenceGo-to-MarketMember SignalsGitHub3 APIs65.1SAP EmarsysMarketing AutomationCustomer EngagementEmail MarketingOmnichannel25 APIs64.8IntuitAccountingFinancialFinancial-Services1 API64.3FactsetFinancialFinancial DataInvestment AnalyticsMarket Data142 APIs64.2anecdotesCompanyComplianceGovernanceRisk3 APIs64.0SendlaneEmail MarketingSMS MarketingE-CommerceMarketing Automation2 APIs63.8HustleCompanyEnterpriseMessagingSMS1 API63.5FieldPulseCompanyField Service ManagementService ManagementScheduling1 API62.3Infusionsoft (Keap)CRMMarketing AutomationSales AutomationEmail Marketing9 APIs61.7Apollo.ioSales IntelligenceProspectingEngagementB2B Data1 API61.1Float Financialspend-managementcorporate-cardsexpense-managementaccounts-payable2 APIs60.2SalesloftSalesSales EngagementCadencesCRM1 API58.3SimpleTextingSMSMMSMessagingMarketing1 API57.7Shortcut SoftwareCompanyProject ManagementIssue TrackingAgile1 API57.0ZendeskChatCRMHelp CenterSell76 APIs56.6SalesflareCRMSalesB2BContacts2 APIs56.2RingCentralCommunicationsUCaaSVoiceVideo1 API55.1DeelHRPayrollGlobal PayrollEOR8 APIs55.0WeelPaymentsAustraliaSpend ManagementExpense Management1 API55.0MaintainXCompanyPhysical AiMaintenanceCMMS1 API54.5
Developing 38 Usable, with meaningful gaps to close
NationBuilderCommunity OrganizingCRMPoliticalNon-Profit1 API53.2SmartcatCompanyArtificial IntelligenceTranslationLocalization2 APIs52.9360LearningCompanyEdtechLearning Management SystemE-Learning5 APIs51.8DripEmail MarketingMarketing AutomationE-CommerceCustomer Engagement1 API51.8LawmaticsLegalCRMLaw FirmsClient Intake1 API51.4HostawayVacation RentalsShort-Term RentalsProperty ManagementChannel Manager16 APIs51.2Cart.comCompanyE-CommerceRetailOrder Management1 API50.9GreenhouseATSRecruitingHiringTalent Acquisition6 APIs50.7ManyChatChat MarketingMessenger MarketingConversational CommerceMarketing Automation3 APIs50.1NimbleCRMSalesContact ManagementRelationship Management1 API49.5NinjaOneCompanyDeveloper ToolsIT ManagementRMM1 API48.5Siemens PLMPLMProduct Lifecycle ManagementTeamcenterNX3 APIs48.4Help ScoutCustomer-SupportHelp DeskEmailLive Chat25 APIs48.3TabsBillingRevenue AutomationAccounts ReceivableRevenue Recognition2 APIs48.3DataikuAnalyticsArtificial IntelligenceData PlatformData Science3 APIs48.1CampfireCompanyAccountingERPFinance1 API47.6WrikeWork ManagementProject ManagementCollaborationProductivity1 API47.0RemoteCompanyHRPayrollEmployer of Record1 API46.9OpalCompanyConsumerMarketingContent Planning6 APIs46.8TrustLayerCompanyFintechInsurtechInsurance2 APIs46.4HumaansHRHRISHuman ResourcesPeople Operations1 API46.2ClioBillingCalendaringDocument-ManagementLaw Firms1 API45.0BigCommerceE-CommerceRetailCatalogOrder59 APIs44.7ShiftmoveCompanyFleet ManagementMobilityAutomotive1 API44.6KajabiCreator EconomyOnline CoursesMembershipsE-Commerce1 API44.5ProcurifySpend ManagementProcurementPurchase OrdersAccounts Payable1 API44.5NavanCorporate TravelExpense ManagementCorporate CardsSpend Management1 API44.0SpotnanaCompanyTravelCorporate TravelTravel Management11 APIs43.0Respond.ioMessagingOmnichannelCustomer ConversationsWhatsApp1 API42.5Work MarketWorkforce ManagementContractorsFreelanceGig Economy1 API42.1Spree CommerceE-CommerceHeadless CommerceProductOrder4 APIs42.0Microsoft ProjectBudgetingGantt ChartsMicrosoftPortfolio-Management16 APIs41.6VSCOCompanyConsumerPhotographyPhoto Editing1 API41.5PylonCustomer-SupportCustomer OperationsTicketingKnowledge Base1 API40.9Neon OneNon-ProfitCRMFundraisingDonor Management1 API40.4Proton.aiCompanyCRMSalesDistribution1 API40.4Elastic PathCommerceHeadless CommerceComposable CommerceE-Commerce27 APIs39.8BloomerangNon-ProfitDonor ManagementCRMFundraising1 API39.6
Thin 27 Limited public surface area
FrontCustomer-SupportEmailInboxCustomer Operations2 APIs39.1AlationData CatalogData GovernanceData IntelligenceData Lineage4 APIs38.8PagerDutyAlertingDevOpsIncident ManagementOn-Call Management1 API38.7Canoe Intelligencealternative-investmentsprivate-marketsdocument-automationdata-extraction3 APIs37.6QgivNon-ProfitFundraisingDonationsPayments1 API37.2BrightcoveVideoMediaStreamingLive Streaming11 APIs37.0trello1 API37.0RipplingHRHCMPayrollIT1 API36.8Spree CommerceCommerceHeadlessE-CommerceOpen-Source5 APIs36.6MetronomeBillingFinOpsMeteringPricing1 API36.2CampfireAccountingERPGeneral LedgerRevenue Recognition1 API36.1TabsTabsRevenueBillingInvoicing1 API36.0IntralinksDocument-ManagementSecure File SharingVirtual Data Room1 API35.6clickup12 APIs35.3Employment HeroHRHRISPayrollRecruitment1 API34.3OpenProjectAgileGanttOpen-SourceProject Management1 API34.1ShortcutProject ManagementAgileSoftware DevelopmentIssue Tracking1 API33.1ClockifyTime TrackingTimesheetsProductivityProject Management1 API32.7Mighty NetworksCommunityCoursesMembershipCreator Economy1 API32.3DistruCompanyCannabisERPSeed-to-Sale1 API32.0CapsuleContact ManagementCRMOpportunities1 API30.7Aha.ioProduct ManagementRoadmappingIdea ManagementProduct Development1 API29.8GrowthBookFeature FlagsExperimentationOpen-SourceAB Testing1 API29.6Incident.ioAIOpsIncident Management25 APIs29.6DynamicWeb3WalletsAuthenticationEmbedded Wallets1 API29.4BoulevardSalon SoftwareSpa SoftwareMed SpaAppointment Scheduling7 APIs28.9SmartSimpleGrants ManagementResearch AdministrationCSRFunding7 APIs26.4

APIs with this tag (84)

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 8 Complete, well-documented, and agent-ready
Kit Custom Fields APIThe Custom Fields API from Kit — 4 operation(s) for custom fields.82.5HubSpot CRM Properties APIThe CRM properties endpoints allow you to manage custom properties and view default property details for an...80.4SendGrid Custom Fields APITwilio SendGrid Legacy Marketing Campaigns Contacts: Custom Fields API75.5AWeber Custom Fields APIThe Custom Fields API from AWeber — 5 operations for creating, reading, renaming and deleting the custom su...72.5Birdeye Custom Fields APICreate, delete , update , associate and get custom fields easily.70.9Cvent Event Cloud Custom Fields APICustom Fields are created by event planners to track important information about specific objects like even...70.4Remote Custom Fields APICustomer-defined fields on companies and employments69.2Asana Custom Fields APIThe Asana Custom Fields API allows developers to create and manage custom fields within Asana, a popular pr...66.5
Strong 14 Solid coverage with minor gaps
Common Room Custom Fields APIOperations related to custom field definitions65.1QuickBooks Custom Fields APIThe QuickBooks Custom Fields API is a premium API that provides programmatic access to custom field definit...64.3Factset Custom Fields APIThe Custom Fields API from Factset — 1 operation(s) for custom fields.64.2Hustle Custom Fields APIThe Custom Fields API from Hustle — 1 operation(s) for custom fields.63.5FieldPulse Custom Fields APIEndpoints related to custom fields62.3Apollo.io Fields APIField and custom-field definitions across contacts, accounts and opportunities. 4 operation(s) from the pub...61.1Salesloft Custom Fields API[https://developer.salesloft.com/docs/api/custom-fields/](https://developer.salesloft.com/docs/api/custom-f...58.3SimpleTexting Custom Fields APIRead account custom fields / merge tags.57.7Shortcut Software Custom Fields APIThe Custom Fields API from Shortcut Software — 2 operation(s) for custom fields.57.0Zendesk Sell Custom Fields APIThe Zendesk Sell Custom Fields API lets you manage custom fields for leads, contacts, and deals. You can as...56.6Salesflare Custom Fields APIThe Custom Fields API from Salesflare — 4 operation(s) for custom fields.56.2RingCentral Custom Fields APIThe Custom Fields API from RingCentral — 2 operation(s) for custom fields.55.1Deel Custom Fields APICustom fields on contracts and people55.0MaintainX Custom Fields APIOperations on Custom Fields54.5
Developing 36 Usable, with meaningful gaps to close
NationBuilder Custom Fields APICustom fields are available for Signups and Donations. See [here](https://support.nationbuilder.com/en/arti...53.2Smartcat CustomFields APIThe CustomFields API from Smartcat — 1 operation(s) for customfields.52.9360Learning Custom Fields APIThe Custom Fields API from 360Learning — 3 operation(s) for custom fields.51.8Drip Custom Fields APIThe Custom Fields API from Drip — 1 operation(s) for custom fields.51.8Hostaway Custom Fields APIDefine and manage custom fields on listings and reservations, plus retrieve and set custom field values on ...51.2Greenhouse CustomFields APIOrg-defined custom fields and their options.50.7ManyChat Page APIPage-level configuration for a connected ManyChat page: connected page info, tags, typed custom user field ...50.1Nimble Contacts Fields APIUser-definable contact field schema — fields, choice option lists, field groups and tabs, plus primary-valu...49.5Nimble Deals Fields APIDeal field surface — the user deal field list and the column catalogue backing Nimble's deal listing views....49.5Nimble Deals Pipelines Fields APIPer-pipeline deal custom fields — fields, choice lists and field groups scoped to a single deal pipeline. 9...49.5NinjaOne Custom Fields APICustom Fields48.5Siemens PLM Custom Fields APIThe Custom Fields API from Siemens PLM — 4 operation(s) for custom fields.48.4Help Scout Custom Fields APIRead custom field definitions on inboxes and read / update custom field values on conversations.48.3Tabs Custom Fields APIThe Custom Fields API from Tabs — 1 operation(s) for custom fields.48.3Dataiku Custom Fields APIManage custom fields on artifacts48.1Campfire Custom Fields APIThe Custom Fields API from Campfire — 1 operation(s) for custom fields.47.6Wrike Custom Fields APICustom field definitions and management47.0TrustLayer custom-fields APIThe custom-fields API from TrustLayer — 4 operation(s) for custom-fields.46.4Humaans Custom Fields APITenant-defined custom field definitions and values46.2Clio Custom Fields APIThe Custom Fields API from Clio — 2 operation(s) for custom fields.45.0BigCommerce Custom Fields APIThe Custom Fields API from BigCommerce — 2 operation(s) for custom fields.44.7Shiftmove Custom fields APIThe Custom fields API from Shiftmove — 2 operation(s) for custom fields.44.6Kajabi Custom Fields APIThe Custom Fields API from Kajabi — 2 operation(s) for custom fields.44.5Procurify custom-fields APIThe custom-fields API from Procurify — 2 operation(s) for custom-fields.44.5Navan Custom Fields APICompany custom fields used for cost-center / GL coding. CONFIRMED.44.0Spotnana Custom Fields APIAPIs to manage company custom fields.43.0Respond.io Custom Fields APIStructured contact metadata definitions.42.5Work Market Custom Fields APIThe Custom Fields API from Work Market — 1 operation(s) for custom fields.42.1Spree Commerce Custom Fields APICustom field definitions for products, variants, customers, and other resources42.0Microsoft Project Custom Fields APIManage enterprise custom field definitions41.6VSCO Custom Fields APIThe Custom Fields API from VSCO — 2 operation(s) for custom fields.41.5Pylon Custom Fields APICustom field definitions.40.9Neon One Custom Fields APIStandard custom fields and the Custom Objects framework.40.4Proton.ai Custom Fields APIThe Custom Fields API from Proton.ai — 5 operation(s) for custom fields.40.4Elastic Path Custom Fields APIA Custom Field represents a single field of data (for example a Product Rating). A Custom API is composed o...39.8Bloomerang Custom Fields APIAccount-specific custom field definitions by object type.39.6
Thin 26 Limited public surface area
Front Custom Fields APIThe Custom Fields API from Front — 7 operation(s) for custom fields.39.1Alation Custom Fields APIManage custom field values38.8PagerDuty Custom Fields APICustom fields allow you to enrich PagerDuty incidents with critical and helpful metadata throughout the inc...38.7Canoe Intelligence Custom Fields APIThe Custom Fields API from Canoe Intelligence — 1 operation(s) for custom fields.37.6Qgiv Custom Fields APIConfirmed. Manage custom fields on a donation form.37.2Brightcove Custom Fields APIOperations for creating and managing custom fields.37.0trello CustomFields APIOperations for creating, retrieving, updating, and deleting custom field definitions and their values on bo...37.0Rippling Custom Fields APIDefine and read custom fields attached to employees, departments, and other Rippling resources for tenant-s...36.8Spree Commerce Custom Fields APIThe Custom Fields API from Spree Commerce — 2 operation(s) for custom fields.36.6Metronome Custom fields API[Custom fields](https://docs.metronome.com/integrations/custom-fields/) enable adding additional data to Me...36.2Campfire Custom Fields APIThe Custom Fields API from Campfire — 1 operation(s) for custom fields.36.1Tabs CustomFields APIThe CustomFields API from Tabs — 1 operation(s) for customfields.36.0Intralinks Custom Fields APIThe Custom Fields API from Intralinks — 1 operation(s) for custom fields.35.6clickup Custom Fields APIOperations for retrieving custom field definitions and setting custom field values on tasks.35.3Employment Hero Custom Fields APIThe Custom Fields API from Employment Hero — 1 operation(s) for custom fields.34.3OpenProject Custom Fields APIThe Custom Fields API from OpenProject — 1 operation(s) for custom fields.34.1Shortcut Custom Fields APIThe Custom Fields API from Shortcut — 2 operation(s) for custom fields.33.1Clockify Custom fields APIThe Custom fields API from Clockify — 4 operation(s) for custom fields.32.7Mighty Networks CustomFields APIManage custom fields for your network32.3Distru CustomFields APIThe CustomFields API from Distru — 2 operation(s) for customfields.32.0Aha.io Custom fields APIThe Custom fields API from Aha.io — 2 operation(s) for custom fields.29.8GrowthBook CustomFields APIThe CustomFields API from GrowthBook — 2 operation(s) for customfields.29.6Incident.io Custom Fields APIThe Custom Fields API from Incident.io — 2 operation(s) for custom fields.29.6Dynamic Custom Fields APIThe Custom Fields API from Dynamic — 2 operation(s) for custom fields.29.4Boulevard Admin API - Clients & CRMQuery and mutate client (customer) records synced from Boulevard's CRM - profiles, contact details, custom ...28.9SmartSimple SmartConnect Records APIGet, list, and update (create) records stored in SmartSimple's Universal Tracking Application (UTA) at Leve...26.4

Score breakdown

Frequency
63.9
log-scaled weighted occurrences
Breadth
2.6
spread across providers
Quality lift
59.4
mean composite of providers using it
Cohesion
6.3
strength of nearest seed neighbor

Related tags

Contacts 29 co-occurrences Departments 9 co-occurrences Email Marketing 10 co-occurrences Timesheets 7 co-occurrences Tax Rates 6 co-occurrences Time Off 7 co-occurrences Notes 10 co-occurrences Marketing Automation 12 co-occurrences

Where this tag comes from

Api tag86
Provider tag2
Openapi tag74
Openapi op tag293

Cohort brief

Auto-generated

The 94 providers in the APIs.io catalog tagged Custom Fields, scored on the Kin Score. Every figure below is computed from the catalog — nothing here is written.

Providers
94
all scored
Mean Kin Score
48.6
+27.9 vs catalog 20.7
Mean Agent Readiness
31.9
+22.2 vs catalog 9.7
Spread
25–85.6
median 46.7 · σ 13.5
How the 94 split by band
Exemplar 10Strong 21Developing 36Thin 25Emerging 2Minimal 0
Facet averages, against the whole catalog
FacetThis cohortCatalogDifferenceScored
Contract Quality 59.5 17.5 +42 94
Access Clarity 49.9 22.3 +27.6 94
Developer Ergonomics 44.9 17.9 +27 94
Operational Transparency 37 11.3 +25.7 94
Discoverability 73.1 60.4 +12.7 94
Contract Governance 17.1 6.4 +10.7 94

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) 44% 16% +28
MCP server (first-party) 21% 7% +14
Agent Skills 0% 0% 0
OAuth scopes 45% 9% +36
Security 100% 88% +12
Arazzo workflows 10% 2% +8
Governance rules 36% 13% +23

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 Kit 85.6
  2. 2 HubSpot 82.4
  3. 3 SendGrid 77
  4. 4 GetResponse 74.1
  5. 5 AWeber 73.5
  6. 6 Birdeye 72.8
  7. 7 Remote 69.9
  8. 8 Cvent Event Cloud 69.6
  9. 9 Common Room 67.7
  10. 10 Asana 66.5
Top by Agent Readiness
  1. 1 Birdeye 61
  2. 2 Kit 61
  3. 3 Common Room 60.8
  4. 4 Apollo.io 55.3
  5. 5 Tabs 55.2
  6. 6 HubSpot 54.4
  7. 7 Campfire 54.1
  8. 8 Factset 52.8
  9. 9 Shortcut Software 52
  10. 10 Spotnana 50.8
All 94 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.

Work with this as data

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MCP server

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

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