emerging · 0.3 capability resource

Custody

Score 22.6 / 100 47 providers +6 via APIs 25 APIs Search apis.io →

Providers using this tag (47)

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

Exemplar 2 Complete, well-documented, and agent-ready
KrakenKrakenCryptocurrencyExchangeTrading24 APIs74.5Gemini Trust CompanyCompanyCryptocurrencyExchangeTrading2 APIs72.6
Strong 9 Solid coverage with minor gaps
FireblocksDigital AssetsVaultTransaction7 APIs66.4BullishDigital AssetsCryptocurrencyExchangeTrading1 API65.1CitiBankingFinancial-ServicesOpen BankingPayments196 APIs60.9BraleCompanyStablecoinsStablecoin IssuancePayments1 API59.9Zero HashCompanyCrypto InfrastructureDigital AssetsStablecoins4 APIs58.2Ripple LabsCompanyFinancial-ServicesPaymentsCross-Border Payments5 APIs57.7FordefiCompanySecurityCryptocurrencyDigital Assets1 API56.1UtilaCompanyWeb3Digital AssetsStablecoins1 API55.6UpvestBanking InfrastructureFintechInvestmentSecurities1 API55.4
Developing 14 Usable, with meaningful gaps to close
SygnumCompanyBankingDigital AssetsCryptocurrency10 APIs53.4Binance.USCompanyCryptocurrencyDigital AssetsExchange3 APIs52.6tZEROCompanyDigital SecuritiesTokenizationCapital Markets2 APIs50.9PaxosCompanyStablecoinsCryptocurrencyPayments1 API48.5Oumla LtdCompanyBlockchainDigital AssetsWallet Infrastructure1 API47.9Anchorage DigitalCompanyCryptoDigital Assets2 APIs47.8FigmentStakingBlockchainDigital AssetsProof of Stake1 API47.8CubistCompanyDeveloper ToolsKey ManagementWallets1 API47.5BlockdaemonBlockchainWeb3StakingValidator11 APIs47.4ClearstreamCapital MarketsCollateral ManagementFinancial-Services8 APIs47.3WealthKernelCompanyInvestingWealth ManagementBrokerage1 API45.9CoinbaseBlockchainCryptocurrencyExchange5 APIs45.7AltoIRACompanyFinancial-ServicesRetirementSelf-Directed IRA2 APIs45.4BakktCompanyCrypto Web3CryptocurrencyDigital Assets1 API41.4
Thin 10 Limited public surface area
AltruistCompanyFintechWealth Management2 APIs38.6Goldman SachsBankingFinancialInvestment BankingMoney Center9 APIs36.9BitGoDigital AssetsWalletsBlockchain1 API35.6TaurusCompanyDigital AssetsCryptocurrency3 APIs35.4First Digital TrustCompanyDigital AssetsTrust Services1 API34.0BitPowr Technologies, Inc.CompanyCryptocurrencyBlockchainDigital Assets1 API30.6ComethCompanyBlockchainAccount AbstractionERC-43373 APIs30.6BastionCompanyStablecoinsPaymentsWallets1 API30.1Celsius NetworkCompanyCryptocurrencyDigital AssetsFinancial-Services1 API30.1FalconXCompanyCryptocurrencyDigital AssetsPrime Brokerage1 API30.0
Emerging 7 Early or largely undocumented
Unchained CapitalCompanyBitcoinCryptocurrencyFinancial-Services21.7XapoCompanyCryptoBitcoinBanking20.8EntropyCompanyCryptographyThreshold 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
FinoaCompanyDigital AssetsCryptocurrency9.5Tradewind MarketsCompanyFintechPrecious MetalsBlockchain5.5CYBAVOCompanyCryptocurrencyDigital Asset SecurityWallets3.7NYDIGCompanyFintechBitcoinCryptocurrency2.5Protego Trust BankCompanyBankingFinancial-ServicesDigital Assets1.1

APIs with this tag (25)

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 2 Complete, well-documented, and agent-ready
Kraken Custody REST APIInstitutional custody API providing programmatic access to vaulting, sub-vaulting, wallet generation, trans...74.5Gemini Crypto Trading REST APIThe Gemini Exchange REST API for spot, margin and perpetuals trading: market data, order placement and canc...72.6
Strong 3 Solid coverage with minor gaps
Fireblocks Transactions APICreate, cancel, drop, and query digital-asset transactions across all supported chains. Every transaction p...66.4Fireblocks Vaults APICreate and manage vault accounts, asset wallets, deposit addresses, attached tags, and balance inquiries. V...66.4Bullish Custody APIAuthenticated APIs for custody, [Custody Basic Examples](https://github.com/bullish-exchange/api-examples/b...65.1
Developing 8 Usable, with meaningful gaps to close
Settlement Info Reporting APISecurity settlement information reporting from the SIX custody cockpit for the Swiss market, publicly docum...54.1Sygnum Custody APIEndpoint set designed for bank clients to fetch account balances held in Sygnum's institutional-grade digit...53.4Blockdaemon Builder Vault TSMThreshold Signature Scheme (TSM) MPC wallet platform for builders. Customizable, deployable on-premises or ...47.4Blockdaemon Institutional VaultSelf-hosted MPC wallet for institutional hot, warm, and cold storage with granular governance, transaction ...47.4Clearstream Xact via SWIFTXact via SWIFT delivers settlement, custody, asset servicing and reporting messages over the SWIFTNet FIN n...47.3Clearstream Xact Web PortalXact Web Portal is the browser-based interface to ClearstreamXact for instructing settlement, custody and c...47.3WealthKernel APIAll-in-one REST API for digital investing: onboarding, accounts (GIA/ISA/JISA/SIPP), funding, custody, trad...45.9Banco B3 APIsBanco B3 Custody API for operation billing, position reports, and fund quote validation, plus the Settlemen...42.0
Thin 6 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...36.9NOWPayments Custody APIFund custody management API enabling limitless off-chain operations, sub-account creation, and controlled f...36.1Taurus-PROTECT & Taurus-CAPITAL APIREST API for institutional custody (Taurus-PROTECT) and tokenization / digital asset issuance (Taurus-CAPIT...35.4Open Trust APIsFirst Digital's RESTful API suite for programmatic access to its trust and custody data and services. The p...34.0Bastion 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...27.6
Emerging 5 Early or largely undocumented
BNY Asset Servicing APIAsset Servicing API family for custody, fund accounting, middle-office, and transfer-agency operations, pub...20.5Account 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

Companies reaching this through an API (6)

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

B3 (Brasil Bolsa Balcão) BNY Mellon Northern Trust NOWPayments SIX UBS

Score breakdown

Frequency
50.0
log-scaled weighted occurrences
Breadth
1.3
spread across providers
Quality lift
43.8
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 15 co-occurrences FIX 5 co-occurrences Settlement 9 co-occurrences Tokenization 10 co-occurrences Vault 7 co-occurrences

Where this tag comes from

Provider tag47
Api tag25

Cohort brief

Auto-generated

The 47 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
47
all scored
Mean Kin Score
38.6
+14.6 vs catalog 24
Mean Agent Readiness
22.9
+10.5 vs catalog 12.4
Spread
1.1–74.5
median 45.4 · σ 19.5
How the 47 split by band
Exemplar 2Strong 9Developing 14Thin 10Emerging 7Minimal 5
Facet averages, against the whole catalog
FacetThis cohortCatalogDifferenceScored
Developer Ergonomics 42.5 23.4 +19.1 47
Operational Transparency 30.5 14 +16.5 47
Contract Quality 33.7 20.1 +13.6 47
Access Clarity 37.1 26.5 +10.6 47
Discoverability 67.5 61 +6.5 47
Contract Governance 12.1 6.5 +5.6 47

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) 13% 10% +3
MCP server (first-party) 19% 13% +6
Agent Skills 0% 0% 0
OAuth scopes 26% 11% +15
Security 100% 96% +4
Arazzo workflows 4% 2% +2
Governance rules 13% 13% 0

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 74.5
  2. 2 Gemini Trust Company 72.6
  3. 3 Fireblocks 66.4
  4. 4 Bullish 65.1
  5. 5 Citi 60.9
  6. 6 Brale 59.9
  7. 7 Zero Hash 58.2
  8. 8 Ripple Labs 57.7
  9. 9 Fordefi 56.1
  10. 10 Utila 55.6
Top by Agent Readiness
  1. 1 Citi 52.3
  2. 2 Ripple Labs 51.8
  3. 3 Brale 51.6
  4. 4 Gemini Trust Company 50.1
  5. 5 Anchorage Digital 47.5
  6. 6 Paxos 46.5
  7. 7 AltoIRA 44.7
  8. 8 tZERO 44.4
  9. 9 Figment 41.8
  10. 10 Bakkt 39
All 47 members of this roster resolve to a scored provider in the catalog.Generated from the catalog build of 20 September 2026, across 27620 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

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

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