emerging · 0.8

Parties

Score 22.1 / 100 38 providers 38 APIs Search apis.io →

Providers using this tag (38)

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

Exemplar 1 Complete, well-documented, and agent-ready
Natural AICompanyArtificial IntelligencePaymentsAgents15 APIs68.7
Strong 3 Solid coverage with minor gaps
KPNTelecommunicationsNetherlandsMobile Network OperatorBroadband38 APIs61.9first directFinancial-ServicesBankingOpen BankingPSD24 APIs56.2DigitsAccountingBookkeepingFinanceGeneral Ledger10 APIs54.6
Developing 16 Usable, with meaningful gaps to close
SpareOpen BankingOpen FinanceAccount InformationPayment Initiation17 APIs53.5TrustLayerCompanyFintechInsurtechInsurance21 APIs48.5WorldpayPaymentsPayment ProcessingPayment GatewayTokenization46 APIs46.4Bank of Ireland (UK)Financial-ServicesBankingOpen BankingPSD25 APIs45.4Hampden & CoFinancial-ServicesBankingPrivate BankingOpen Banking4 APIs44.7InvestecFinancial-ServicesBankingOpen BankingPSD29 APIs44.4Coventry Building SocietyFinancial-ServicesBankingBuilding SocietyOpen Banking4 APIs44.3KrooFinancial-ServicesBankingOpen BankingPSD23 APIs44.2Chase UKFinancial-ServicesBankingOpen BankingPSD23 APIs43.4zopaCompanyBankingFintechOpen Banking12 APIs43.3Aldermore BankFinancial-ServicesBankingSavingsSpecialist Lending4 APIs42.0Lloyds Banking GroupFinancial-ServicesBankingOpen BankingPSD26 APIs41.9CouttsFinancial-ServicesBankingPrivate BankWealth Management4 APIs40.9Santander UKFinancial-ServicesBankingOpen BankingPSD24 APIs40.7PartyKitReal-TimeMultiplayerWebSocketsCloudflare4 APIs40.6Secure Trust BankFinancial-ServicesBankingOpen BankingPSD24 APIs39.9
Thin 15 Limited public surface area
Monument BankFinancial-ServicesBankingOpen BankingPSD24 APIs39.2Tandem BankFinancial-ServicesBankingOpen BankingPSD23 APIs38.6Cynergy BankFinancial-ServicesBankingOpen BankingPSD23 APIs38.5FiservBankingFinancialPaymentsWealth Management27 APIs38.5Recognise BankFinancial-ServicesBankingOpen BankingPSD24 APIs38.2UK Open BankingOpen BankingFinancial-ServicesPaymentsAccount Information42 APIs38.2OneflowContract ManagementContract Lifecycle ManagementE-SignatureDigital Contracts11 APIs36.8Shawbrook BankFinancial-ServicesBankingSavingsSpecialist Lending4 APIs35.8GB BankFinancial-ServicesBankingOpen BankingPSD24 APIs35.7NatWest GroupBankingOpen BankingFinancial-ServicesPayments21 APIs35.1Paragon BankFinancial-ServicesBankingSavingsMortgages4 APIs34.8Lex MachinaLegalLegal AnalyticsLegal TechnologyLitigation21 APIs34.2Bank of ScotlandFinancial-ServicesBankingOpen BankingPSD24 APIs34.1Capsule CRMCRMSalesContactsPipeline Management6 APIs33.2CapsuleContact ManagementCRMCustom FieldsOpportunities4 APIs31.2
Emerging 2 Early or largely undocumented
Administrative Office of the U.S. CourtsCourtsFederal-GovernmentLegalPACER3 APIs25.1QualiaTitle InsuranceEscrowReal-EstateClosing6 APIs20.2
Minimal 1 Almost no public developer surface
ResWareTitleEscrowReal-EstateClosing7 APIs8.4

APIs with this tag (38)

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
Natural AI Parties APIParty and organization management68.7
Strong 3 Solid coverage with minor gaps
KPN FIAM APIA collection of crates for federated identity and access management61.9first direct Account and Transaction Information API (AIS)OBIE Read/Write Account and Transaction Information (AIS) API for first direct accounts, exposed through HS...56.2Digits Parties APIVendors, suppliers, customers, and other business relationships.54.6
Developing 16 Usable, with meaningful gaps to close
Spare Parties APIThe Parties API from Spare — 1 operation(s) for parties.53.5TrustLayer Parties APIThe Parties API from TrustLayer — 20 operation(s) for parties.48.5Worldpay Parties APICreate and maintain parties.46.4Bank of Ireland (UK) Account & Transaction Information APIOBIE Read/Write Account & Transaction Information (AIS) API for Bank of Ireland (UK) plc, allowing authoris...45.4Hampden & Co Account & Transaction Information APIOBIE Read/Write Account Information Service (AIS) - accounts, balances, transactions, beneficiaries, standi...44.7Investec Account and Transaction Information API (AIS)UK Open Banking Account Information Service (AISP) interface for accessing account, balance, transaction, a...44.4Coventry Building Society Account & Transaction Information API (AIS)OBIE Read/Write Account and Transaction Information Services (AIS) API, CBS v2.0, providing consented third...44.3Kroo Account and Transaction Information APIKroo's PSD2 Account Information Service (AIS) dedicated interface, conformant to the OBIE Read/Write Accoun...44.2Chase UK Account and Transaction Information API (AIS)Chase UK's Account Information Service (AIS) dedicated interface, conformant to the OBIE Read/Write API Sta...43.4zopa Parties APIThe Parties API from zopa — 2 operation(s) for parties.43.3Aldermore Account & Transaction Information API (OBIE Read/Write Standard)The UK Open Banking Read/Write Account and Transaction Information (AIS) API standard, FAPI-secured with OA...42.0Lloyds Banking Group Account and Transaction Information APIOBIE Read/Write Account and Transaction Information (AIS) API for accessing account, balance, transaction, ...41.9Coutts Account and Transaction Information APIOBIE Read/Write Account and Transaction Information (AIS) API for Coutts, letting FCA-authorised AISPs retr...40.9Santander UK Account & Transaction Information APIOBIE Read/Write Account and Transaction Information (AIS) API for accessing account, balance, transaction, ...40.7PartyKit Deployed Party (HTTP / WebSocket)Public HTTP and WebSocket interface for a deployed PartyKit project at project.user.partykit.dev. Each part...40.6Secure Trust Bank Account & Transaction Information API (OBIE Read/Write, AIS)The OBIE Read/Write Account and Transaction Information (AIS) API - FAPI-secured access to account, balance...39.9
Thin 15 Limited public surface area
Monument Bank Account and Transaction Information APIUK Open Banking Read/Write Account & Transaction Information (AIS) API per the OBIE Read/Write API Standard...39.2Tandem Bank Account and Transaction Information API (AIS)Tandem Bank's Open Banking Account Information Service (AIS) exposing account, balance, transaction, and pr...38.6Cynergy Bank Account & Transaction Information API (AIS)Cynergy Bank's implementation of the OBIE Read/Write Account & Transaction Information (AISP) API, allowing...38.5Fiserv Parties APIManage customer and party information including personal details and contact information.38.5UK Open Banking Account & Transaction Information API (OBIE Standard)Shared OBIE Read/Write Account & Transaction Information (AIS) standard, FAPI-secured with OAuth2/OIDC, mut...38.2UK Open Banking Parties APIThe Parties API from UK Open Banking — 3 operation(s) for parties.38.2Oneflow Parties APICounterparty companies or individuals on a contract.36.8Shawbrook Account & Transaction Information API (AIS, OBIE Standard, Unverified)UK Open Banking Read/Write Account & Transaction Information API (AISP) as defined by the OBIE Account and ...35.8GB Bank Account and Transaction Information API (AIS)UK Open Banking Read/Write Account & Transaction Information API (AISP) - the OBIE standard for accessing a...35.7NatWest Group Parties APIThe Parties API from NatWest Group — 3 operation(s) for parties.35.1Paragon Bank Account and Transaction Information API (OBIE standard, unverified)The OBIE Read/Write Account and Transaction Information (AIS) API standard - FAPI-secured (OAuth2/OIDC, mut...34.8Lex Machina Parties APIParty data.34.2Bank of Scotland Account and Transaction Information API (AIS)OBIE Read/Write Account and Transaction Information (AIS) API - account details, balances, transactions, st...34.1Capsule CRM Parties APIThe Parties API from Capsule CRM — 4 operation(s) for parties.33.2Capsule Parties APIThe Parties API from Capsule — 5 operation(s) for parties.31.2
Emerging 2 Early or largely undocumented
Administrative Office of the U.S. Courts Parties APIThe Parties API from Administrative Office of the U.S. Courts — 1 operation(s) for parties.25.1Qualia Contacts and Parties APIPull contact and party data for the files on an account - the people and organizations attached to a closin...20.2
Minimal 1 Almost no public developer surface
ResWare Contacts APIModeled logical service area for the people and organizations attached to a file - buyers, sellers, lenders...8.4

Score breakdown

Frequency
48.1
log-scaled weighted occurrences
Breadth
1.0
spread across providers
Quality lift
49.2
mean composite of providers using it
Cohesion
0.0
strength of nearest seed neighbor

Related tags

Standing Orders 23 co-occurrences Domestic Standing Orders 23 co-occurrences Domestic Standing Order Consents 21 co-occurrences Account Access Consents 21 co-occurrences File Payment Consents 21 co-occurrences Funds Confirmation Consents 21 co-occurrences Domestic Payment Consents 21 co-occurrences Domestic Scheduled Payment Consents 21 co-occurrences

Where this tag comes from

Api tag17
Openapi tag13
Openapi op tag109

Cohort brief

Auto-generated

The 38 providers in the APIs.io catalog tagged Parties, scored on the Kin Score. Every figure below is computed from the catalog — nothing here is written.

Providers
38
all scored
Mean Kin Score
40.6
+19.9 vs catalog 20.7
Mean Agent Readiness
32.1
+22.4 vs catalog 9.7
Spread
8.4–68.7
median 40.3 · σ 10.4
How the 38 split by band
Exemplar 1Strong 3Developing 16Thin 15Emerging 2Minimal 1
Facet averages, against the whole catalog
FacetThis cohortCatalogDifferenceScored
Contract Quality 51 17.5 +33.5 38
Discoverability 78.3 60.4 +17.9 38
Developer Ergonomics 33.6 17.9 +15.7 38
Contract Governance 13.6 6.4 +7.2 38
Access Clarity 26.6 22.3 +4.3 38
Operational Transparency 14.5 11.3 +3.2 38

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) 61% 16% +45
MCP server (first-party) 5% 7% -2
Agent Skills 0% 0% 0
OAuth scopes 71% 9% +62
Security 100% 88% +12
Arazzo workflows 0% 2% -2
Governance rules 8% 13% -5

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 Natural AI 68.7
  2. 2 KPN 61.9
  3. 3 first direct 56.2
  4. 4 Digits 54.6
  5. 5 Spare 53.5
  6. 6 TrustLayer 48.5
  7. 7 Worldpay 46.4
  8. 8 Bank of Ireland (UK) 45.4
  9. 9 Hampden & Co 44.7
  10. 10 Investec 44.4
Top by Agent Readiness
  1. 1 Natural AI 67.6
  2. 2 Worldpay 44.8
  3. 3 NatWest Group 44.1
  4. 4 Bank of Ireland (UK) 41.9
  5. 5 KPN 40.8
  6. 6 Aldermore Bank 39.7
  7. 7 Lloyds Banking Group 38.7
  8. 8 Digits 38.3
  9. 9 Shawbrook Bank 37.6
  10. 10 Coutts 36.5
All 38 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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Tools for tags

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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

Call it yourself

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

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