emerging · 0.5

Custody

Score 22.9 / 100 50 providers 23 APIs Search apis.io →
Business capabilities this tag reaches
Capital Markets Operations Management 1
Variants seen in the corpus: Custodycustody

Providers using this tag (50)

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

Exemplar 1 Complete, well-documented, and agent-ready
KrakenCryptocurrencyExchangeTradingMarket Data24 APIs72.2
Strong 8 Solid coverage with minor gaps
BullishDigital AssetsCryptocurrencyExchangeTrading1 API66.0fireblocks7 APIs64.2BraleCompanyStablecoinsStablecoin IssuancePayments1 API60.5Zero HashCompanycrypto-infrastructuredigital-assetsstablecoins4 APIs58.5UpvestBanking InfrastructureFintechInvestmentsSecurities1 API57.0Ripple LabsCompanyFinancial-ServicesPaymentsCross-Border Payments5 APIs56.0SIXFinancialMarket DataStocksReference Data8 APIs55.1UtilaCompanyWeb3Digital AssetsStablecoins1 API54.4
Developing 14 Usable, with meaningful gaps to close
FordefiCompanySecurityCryptocurrencyDigital Assets1 API54.2Binance.USCompanyCryptocurrencyDigital AssetsExchange3 APIs52.8PaxosCompanyStablecoinsCryptocurrencyPayments1 API51.2Oumla LtdCompanyBlockchainDigital AssetsWallet Infrastructure1 API48.6CubistCompanyDeveloper ToolsKey ManagementWallets1 API48.4BlockdaemonBlockchainWeb3StakingValidators11 APIs47.5FigmentstakingBlockchaindigital-assetsproof-of-stake1 API47.4WealthKernelCompanyInvestingWealth ManagementBrokerage1 API46.2CoinbaseBlockchainCryptocurrencyExchange5 APIs44.6Anchorage DigitalCompanyCryptoDigital Assets2 APIs44.5AltoIRACompanyFinancial-ServicesRetirementSelf-Directed IRA2 APIs43.2BakktCompanyCrypto Web3CryptocurrencyDigital Assets1 API42.3B3 (Brasil Bolsa Balcão)FinancialMarket DataStocksTrading10 APIs42.0Anchorage DigitalCompanyCryptoDigital Assets1 API40.3
Thin 13 Limited public surface area
AltruistCompanyFintechWealth Management2 APIs38.6Goldman SachsBankingFinancialInvestment BankingMoney Center9 APIs37.2BitGoDigital AssetsWalletsBlockchain1 API37.1NOWPaymentsCrypto PaymentsCryptocurrencyPayment GatewayInvoicing1 API36.8TaurusCompanyDigital AssetsCryptocurrency3 APIs35.7BNY (Bank of New York Mellon)BankingAsset ServicingTreasury Services4 APIs35.6First Digital TrustCompanyDigital AssetsTrust Services1 API34.2BitPowr Technologies, Inc.CompanyCryptocurrencyBlockchainDigital Assets1 API31.8Celsius NetworkCompanyCryptocurrencyDigital AssetsFinancial-Services1 API30.8BastionCompanyStablecoinsPaymentsWallets1 API30.1FalconXCompanyCryptocurrencyDigital AssetsPrime Brokerage1 API30.0ComethCompanyBlockchainaccount-abstractionerc-43373 APIs29.6Northern TrustFortune 500BankingWealth ManagementAsset Servicing7 APIs27.9
Emerging 9 Early or largely undocumented
Unchained CapitalCompanyBitcoinCryptocurrencyFinancial-Services21.7ClearstreamCapital MarketsCollateral ManagementFinancial-Services6 APIs20.9BNY MellonFinancial-ServicesBankingUnited StatesCustody Bank5 APIs20.8XapoCompanyCryptoBitcoinBanking20.8EntropyCompanyCryptographyThreshold SignaturesDistributed Key Generation17.1AbraCompanyCryptoDigital AssetsWealth Management13.3Rain FinancialCompanyCryptocurrencyCrypto ExchangeDigital Assets13.1iTrustCapitalCompanyFinancial-ServicesCryptocurrencyDigital Assets13.0M&T BankFinancial-ServicesBankingUnited StatesSuper-Regional Bank10 APIs11.2
Minimal 5 Almost no public developer surface
UBSFinancialBanksWealth ManagementInvestment Banking7 APIs10.4FinoaCompanyDigital AssetsCryptocurrency9.5Tradewind MarketsCompanyFintechPrecious MetalsBlockchain5.5CYBAVOCompanyCryptocurrencyDigital Asset SecurityWallets3.7NYDIGCompanyFintechBitcoinCryptocurrency2.5

APIs with this tag (22)

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
Kraken Custody REST APIInstitutional custody API providing programmatic access to vaulting, sub-vaulting, wallet generation, trans...72.2
Strong 4 Solid coverage with minor gaps
Bullish Custody APIAuthenticated APIs for custody, [Custody Basic Examples](https://github.com/bullish-exchange/api-examples/b...66.0Fireblocks Transactions APICreate, cancel, drop, and query digital-asset transactions across all supported chains. Every transaction p...64.2Fireblocks Vaults APICreate and manage vault accounts, asset wallets, deposit addresses, attached tags, and balance inquiries. V...64.2Settlement Info Reporting APISecurity settlement information reporting from the SIX custody cockpit for the Swiss market, publicly docum...55.1
Developing 4 Usable, with meaningful gaps to close
Blockdaemon Builder Vault TSMThreshold Signature Scheme (TSM) MPC wallet platform for builders. Customizable, deployable on-premises or ...47.5Blockdaemon Institutional VaultSelf-hosted MPC wallet for institutional hot, warm, and cold storage with granular governance, transaction ...47.5WealthKernel APIAll-in-one REST API for digital investing: onboarding, accounts (GIA/ISA/JISA/SIPP), funding, custody, trad...46.2Banco B3 APIsBanco B3 Custody API for operation billing, position reports, and fund quote validation, plus the Settlemen...42.0
Thin 5 Limited public surface area
Goldman Sachs RIA Custody APIThe Goldman Sachs Custody Solutions (GSCS) RIA Custody platform exposes REST APIs that let advisor firms an...37.2NOWPayments Custody APIFund custody management API enabling limitless off-chain operations, sub-account creation, and controlled f...36.8Taurus-PROTECT & Taurus-CAPITAL APIREST API for institutional custody (Taurus-PROTECT) and tokenization / digital asset issuance (Taurus-CAPIT...35.7Bastion APIBastion's REST API for regulated stablecoin infrastructure: create and manage custodial wallets, issue and ...30.1Northern Trust Custody APIThe Custody API in the Northern Trust API Store gives institutional clients programmatic access to global c...27.9
Emerging 7 Early or largely undocumented
Clearstream Xact via SWIFTXact via SWIFT delivers settlement, custody, asset servicing and reporting messages over the SWIFTNet FIN n...20.9Clearstream Xact Web PortalXact Web Portal is the browser-based interface to ClearstreamXact for instructing settlement, custody and c...20.9BNY Asset Servicing APIAsset Servicing API family for custody, fund accounting, middle-office, and transfer-agency operations, pub...20.8Account Valuations APIAccount valuations product supporting custody and institutional portfolio reporting. Reference gated behind...11.2Custody End of Day APIWilmington Trust custody end-of-day product for institutional clients, listed in the portal's Custody API g...11.2Fund Accounting APIFund valuation and accounting product (transfer-agency / fund-administration services) in the Custody API g...11.2Position Exposure APIPosition exposure product for institutional custody/portfolio clients. Reference gated behind portal authen...11.2
Minimal 1 Almost no public developer surface
UBS Partner / KeyPort APIUBS Partner and KeyPort form the enterprise integration surface used by partner banks, external asset manag...10.4

Score breakdown

Frequency
49.6
log-scaled weighted occurrences
Breadth
1.4
spread across providers
Quality lift
45.4
mean composite of providers using it
Cohesion
6.9
strength of nearest seed neighbor

Related tags

Institutional 13 co-occurrences Digital Assets 25 co-occurrences Staking 14 co-occurrences Fees 5 co-occurrences Addresses 7 co-occurrences Vault 7 co-occurrences Settlement 8 co-occurrences Stablecoins 10 co-occurrences

Where this tag comes from

Provider tag43
Api tag23

Cohort brief

Auto-generated

The 50 providers in the APIs.io catalog tagged Custody, scored on the Kin Score. Every figure below is computed from the catalog — nothing here is written.

Providers
50
all scored
Mean Kin Score
37
+16.3 vs catalog 20.7
Mean Agent Readiness
21.3
+11.6 vs catalog 9.7
Spread
2.5–70.6
median 35.4 · σ 18.3
How the 50 split by band
Exemplar 2Strong 10Developing 11Thin 13Emerging 9Minimal 5
Facet averages, against the whole catalog
FacetThis cohortCatalogDifferenceScored
Developer Ergonomics 39.4 17.9 +21.5 50
Contract Quality 33.7 17.5 +16.2 50
Operational Transparency 26.6 11.3 +15.3 50
Discoverability 72.6 60.4 +12.2 50
Access Clarity 34.1 22.3 +11.8 50
Contract Governance 15.8 6.4 +9.4 50

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) 38% 16% +22
MCP server (first-party) 12% 7% +5
Agent Skills 0% 0% 0
OAuth scopes 20% 9% +11
Security 100% 88% +12
Arazzo workflows 4% 2% +2
Governance rules 14% 13% +1

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 Kraken 70.6
  2. 2 Bullish 67.3
  3. 3 fireblocks 64.2
  4. 4 Brale 63.3
  5. 5 Zero Hash 61.1
  6. 6 Ripple Labs 60.4
  7. 7 Upvest 58.5
  8. 8 Utila 56.4
  9. 9 Fordefi 56.2
  10. 10 SIX 56
Top by Agent Readiness
  1. 1 Ripple Labs 51.8
  2. 2 Brale 50.2
  3. 3 Paxos 48
  4. 4 Anchorage Digital 47.6
  5. 5 Anchorage Digital 47.5
  6. 6 SIX 46.2
  7. 7 AltoIRA 44.7
  8. 8 Figment 43.9
  9. 9 Zero Hash 39.3
  10. 10 Fordefi 36.4
All 50 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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The distribution (Pro) 
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