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

Stripe Crypto Onramp APIThe Stripe fiat-to-crypto onramp lets your customers securely purchase and exchange cryptocurrencies direct...79.7 Authentik Crypto APICertificate-key pairs used to sign SAML assertions and OIDC ID tokens, and to validate webhook receivers.69.1

Strong 9 Solid coverage with minor gaps

SiftingIO Crypto APIHistorical OHLCV bars for crypto symbols.63.9 Slash Crypto APIThe Crypto API from Slash — 1 operation(s) for crypto.60.1 Alpaca Trading APIThe Alpaca Trading API enables commission-free trading of US-listed equities, options, and crypto. It expos...59.7 Lukka Market Data Streaming APIWebSocket streaming for executed trades, Level-1 order-book quotes, Lukka Prime pricing, Lukka Index valuat...57.7 Lukka MCP ServersSeven first-party hosted Model Context Protocol servers exposing 69 read-only tools over Lukka pricing, ref...57.7 x402 List APIPublic REST API (OpenAPI 3.1) providing access to the x402 services directory, uptime, pricing, facilitator...55.9 Kaiko REST APIREST endpoints for trades, order books, OHLCV, market reference, trade flows, FX rates, and derivatives acr...55.8 Backpack WalletBackpack Wallet is a self-custodial multichain wallet for Solana, Ethereum, and Bitcoin, originally built a...54.9 Adanos Market Sentiment APIRESTful JSON API grouping five sentiment services (Reddit Stocks, X.com Stocks, Stock News, Polymarket Stoc...54.3

Developing 12 Usable, with meaningful gaps to close

Kronos Quant Signal REST APILive REST/JSON API with 32 endpoints for price-path forecasting, market/risk context, accuracy audits, and ...49.1 MyStars FaaS Fulfilment APIREST/HTTP API for pricing, recipient eligibility checks, product catalog, and Telegram Stars/Premium order ...47.7 Infoway Real-time Market Data API Crypto APIThe Crypto API from Infoway Real-time Market Data API — 3 operation(s) for crypto.46.0 Finage Crypto APIThe Crypto API from Finage — 6 operation(s) for crypto.45.8 Request Finance AP and AR APIThe Accounts Payable and Receivable REST API for issuing invoices, accepting crypto and fiat payments, runn...45.8 Tiingo Crypto APIThe Crypto API from Tiingo — 3 operation(s) for crypto.45.0 Finnhub Crypto APIThe Crypto API from Finnhub — 3 operation(s) for crypto.43.5 FinancialData.Net MCP ServerHosted MCP server mapping the entire REST API documentation into callable MCP tools (e.g., getStockSymbols,...43.3 FinancialData.Net REST APIREST API for financial and market data covering equities, ETFs, crypto, forex, derivatives, fundamentals, f...43.3 Fortanix Crypto APIThe Crypto API from Fortanix — 24 operation(s) for crypto.42.8 1Token 1ndex Public Strategy Overview APIAnonymous, read-only REST API returning the aggregate 1ndex strategy overview — current platform statistics...42.2 FastForex crypto APIDigital currencies, pairs & prices40.9

Thin 13 Limited public surface area

Surf Chat APIOpenAI-style Chat/Research API. POST /responses with a surf-2.0 or surf-2.0-instant model and a natural-lan...39.0 Xignite Crypto APICryptocurrency market data including quotes, chart bars, and historical prices for digital assets from the ...39.0 Exoscale crypto APIA suite of cryptographic primitives offered by the Exoscale KMS.38.9 Public Trading APIREST API for programmatic trading on Public — manage brokerage accounts, pull portfolio and transaction his...38.4 Polygon.io Crypto APIAggregates, trades, snapshots, level-2 books, and L2 streaming for crypto pairs across major exchanges.36.7 Paysafe Embedded Wallets APIA REST API enabling platforms to embed digital wallet functionality directly into their products. Customers...34.5 Sardine APIThe Sardine REST API enables real-time fraud detection and compliance across the customer lifecycle. Core A...32.9 SnowSignals APITrendVane daas API — metered, prepaid market-phase reads per currency and timeframe (boundary = settled las...32.9 SnowSignals x402 GatewayPay-per-call retail gateway for the same TrendVane phase reads over the x402 payment protocol (v2) — no acc...32.9 Cross River Stablecoin PaymentsMoney-movement API supporting stablecoin pay-ins and pay-outs across fiat rails for crypto and Web3 partner...30.3 Messari REST APIComprehensive REST API exposing /v1, /v2 endpoints for asset metrics (price, market cap, ROI, mining stats,...29.2 Vauld Enterprise APIEnterprise API for partner organisations covering fiatcrypto trading on India INR rails (deposits via Cards...28.7 DeSo Backend APIThe HTTP JSON API served by every DeSo node — data endpoints (profiles, posts, users, NFTs, creator/DAO coi...26.7

Emerging 6 Early or largely undocumented

El Dorado APIThe El Dorado onramp/offramp trading API for converting between Latin American fiat currencies and crypto (...25.5 Bitwise APIBitwise index, ETF, and fund data API — crypto asset prices, index values, and index methodologies. Authent...24.8 Lucera LumeMarketsLucera is BGC's financial technology subsidiary offering a "high-performance, low latency platform that pro...24.8 TradeBBTradeBB exposes a single publicly consumable machine-readable interface: an llms.txt file designed for LLM ...24.4 Sardine Crypto APICrypto-specific risk and compliance APIs covering wallet screening, on-chain attribution, and Travel Rule m...20.5 CoinMarketCap Pro APISingle REST API spanning Cryptocurrency endpoints (listings, quotes, OHLCV, market pairs, historical), Exch...15.7

Companies reaching this through an API (17)

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

Authentik BGC Group Cross River Bank Eldorado Exoscale FastForex Finage Finnhub Fortanix Infoway Real-time Market Data API Paysafe Sardine Sardine SiftingIO Slash Stripe Xignite

Score breakdown

Frequency

69.4

log-scaled weighted occurrences

Breadth

7.6

spread across providers

Quality lift

30.7

mean composite of providers using it

Cohesion

21.6

strength of nearest seed neighbor

Where this tag comes from

Provider tag278

Api tag42

Openapi tag10

Openapi op tag58

Cohort brief

Auto-generated

The 261 providers in the APIs.io catalog tagged Crypto, scored on the Kin Score. Every figure below is computed from the catalog — nothing here is written.

Providers

261

all scored

Mean Kin Score

27.9

+4.0 vs catalog 23.9

Mean Agent Readiness

15.9

+3.9 vs catalog 12

Spread

1.2–73.3

median 28.1 · σ 17.7

How the 261 split by band

Exemplar 3Strong 17Developing 53Thin 66Emerging 52Minimal 70

Facet averages, against the whole catalog

Facet	This cohort	Catalog	Difference	Scored
Developer Ergonomics	35.4	23.4	+12	261
Contract Quality	25.6	19.8	+5.8	261
Operational Transparency	19.6	14	+5.6	261
Discoverability	65.5	61.2	+4.3	261
Contract Governance	6.1	6.4	-0.3	261
Access Clarity	22.3	26.5	-4.2	261

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

Artifact	This cohort	Catalog	Difference
MCP server (any)	16%	10%	+6
MCP server (first-party)	19%	13%	+6
Agent Skills	0%	0%	0
OAuth scopes	7%	11%	-4
Security	98%	97%	+1
Arazzo workflows	3%	2%	+1
Governance rules	10%	14%	-4

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 Twelve Data 73.3
2 0xArchive 72.7
3 Polygon 68.3
4 Covalent 62.2
5 Ripio 62
6 Didit 59.8
7 Alpaca 59.7
8 Chainstack 59.5
9 MyStars FaaS 59.2
10 Coinflow 58.7

Work with this as data

Every tag here is available over the APIs.io API and to AI agents over MCP.

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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.

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The distribution (Pro)

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Crypto

Providers using this tag (278)

APIs with this tag (42)