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

Crypto.com Developer Platform APIOn-chain developer platform service API for Cronos EVM and Cronos zkEVM, exposing native and ERC-20 token b...68.2

Strong 4 Solid coverage with minor gaps

AnkrScan Block ExplorerAnkrScan is Ankr's multi-chain block explorer covering EVM and non-EVM networks. It is a hosted UI consumin...62.8 Civic Auth APICivic Auth provides OAuth 2.0 and PKCE-based authentication for web and mobile applications with support fo...56.0 EVEDEX Async API (Centrifugo)Real-time exchange events over WebSocket, brokered by Centrifugo with JWT channel access rights and epoch-b...54.9 EVEDEX Documentation & Agent SurfaceThe GitBook developer portal and agent-native documentation surface. Every page is retrievable as markdown ...54.9

Developing 22 Usable, with meaningful gaps to close

Tensor WebSocket APISubscription-based realtime stream of Tensor marketplace events. Channels include `newTransaction` (every c...51.7 Codex GraphQL APICodex is Defined's unified GraphQL API for real-time blockchain data: token prices, OHLCV bars, trades, liq...50.9 Stellar RPC APIThe Stellar RPC API (formerly Soroban RPC) is a JSON-RPC interface for interacting with Soroban smart contr...49.8 Supra Price Feeds REST APIOracle market-data REST API returning the latest price for a trading pair and historical OHLC candles for u...49.2 Supra Price Feeds WebSocket APIStreaming oracle market-data API. Clients open a WebSocket to wss://prod-kline-ws.supra.com with an x-api-k...49.2 Supra RPC Node APIPublic, keyless REST + JSON API served by every Supra RPC node. Covers accounts (resources, modules, coin a...49.2 Bitculator Data APIREST API for cryptocurrency market data. JSON responses with Laravel-style pagination, HTTP Bearer auth, qu...48.9 anchor-x402 APIEighteen stateless pay-per-call services on one FastAPI/AWS Lambda host. Every paid route answers an unpaid...48.2 0G Chain JSON-RPCEthereum-compatible JSON-RPC endpoint for the 0G Chain mainnet ("Aristotle", chain ID 16661), an AI-focused...47.1 0G DA (Data Availability) gRPCgRPC surface for the 0G data-availability layer. The Disperser service accepts blobs asynchronously (Disper...47.1 0G Storage IndexerIndexer service for the 0G Storage network. It locates the storage nodes holding a file's segments, brokers...47.1 Coinbase Wallet SDKThe Coinbase Wallet SDK allows developers to integrate Coinbase Wallet connectivity into decentralized appl...45.7 OKX Wallet API (Onchain OS)Developer APIs for OKX Web3 wallet integration, including multi-chain transaction signing, DEX aggregation ...44.8 GUNZ Chain JSON-RPC APIThe public Ethereum-compatible JSON-RPC endpoint for the GUNZ L1 chain, an Avalanche subnet running Subnet-...43.2 GUNZScan Explorer APIGUNZScan is the GUNZ chain block explorer, referenced from Gunzilla's own chain documentation as the offici...43.2 Lemon Cash Mini App SDKThe Lemon Mini App SDK is the public developer contract for building a Mini App that runs inside the Lemon ...43.2 Infura Web3 APIInfura's managed Web3 API surface — JSON-RPC 2.0 access to Ethereum and 40+ EVM networks (Base, Arbitrum, O...42.6 TronZap REST APIREST API for TRON Energy and Bandwidth rental, energy subscriptions, and AML crypto checks. Endpoints inclu...42.1 TronZap Wallet Orders APIFully public, unauthenticated Orders API for non-custodial wallet integrations. Four operations — POST /v1/...42.1 Upland Appchain History & Chain APIPublic, unauthenticated Antelope (Leap 5.0.3) node and Hyperion 3.3.10 full-history API for Upland's own ap...40.2 Upland Developers APIREST API for approved Upland third-party applications. Maps application users to Upland user IDs through a ...40.2 Quadrata Passport APIServer-side REST API for Quadrata Passport: login/access-token authentication, ECDSA-signed privacy data re...40.0

Thin 16 Limited public surface area

CKB JSON-RPC APIPublic JSON-RPC 2.0 interface to Nervos CKB nodes for querying chain state (blocks, transactions, cells), s...38.4 Uniblock JSON-RPC APIThe Uniblock JSON-RPC API provides a single endpoint for standard JSON-RPC calls across hundreds of blockch...37.0 Brave RewardsOpt-in attention rewards program paying users in Basic Attention Token (BAT) for viewing privacy-preserving...36.7 Brave WalletNative multi-chain crypto wallet built into the Brave browser. Supports EVM and Solana networks; integrates...36.7 DeBank ConnectOAuth 2.0 authorization-code sign-in for dApps. After a user authorizes, the dApp exchanges the code at api...36.3 XMTP Network gRPC APICore gRPC-based API for the XMTP decentralized messaging network. Provides operations for sending and retri...36.0 Gondi GraphQL APIThe off-chain Gondi GraphQL API (api.gondi.xyz/graphql) is the order/offer book and indexing layer behind t...35.4 Ronin Skynet Web3 APIREST Web3 data API on the Ronin blockchain — query accounts, NFTs, tokens, collections, blocks, smart contr...35.0 Immunefi Bug Bounty Programs APIAn unauthenticated, read-only JSON endpoint published on Immunefi's own domain that returns the complete ca...32.8 Towns ProtocolTowns Protocol is an open, decentralized messaging protocol built on Base. Builders integrate via first-par...32.8 FuturePass Identity (OpenID Connect)FuturePass is Futureverse's smart-wallet identity system, exposed to developers as a standards compliant Op...31.3 Futureverse Asset Register APIRelay-compliant GraphQL API for the Asset Register — a metadata ledger that defines what an asset is, what ...31.3 1inch Web3 RPC APIHosted JSON-RPC endpoints for 14+ EVM and non-EVM networks, exposed through the 1inch API key for unified r...29.2 Airstack GraphQL APIThe primary Airstack API offering composable GraphQL queries across on-chain and off-chain Web3 data. Query...29.1 Vesper Contracts API ReferenceSmart contract interface reference for Vesper pools, strategies, PoolAccountant, PoolRewards, and related o...28.7 Audius REST APIPublic REST API for the Audius network. Endpoints cover tracks (metadata, stream, trending), users (profile...28.4

Emerging 15 Early or largely undocumented

Aurora JSON-RPC APIEthereum-compatible JSON-RPC 2.0 API for the Aurora EVM network of virtual chains on NEAR. Exposes the stan...25.3 Hyperledger FireFly APIHyperledger FireFly is a multiparty system orchestration framework providing REST APIs for tokens, messages...25.2 ReadyGamer APIReadyGamer is a joint venture between Sovrun and Virtuals that enables AI-powered, autonomous decision-maki...24.3 5ireChain Mainnet JSON-RPCEthereum-compatible JSON-RPC 2.0 endpoint for the 5ireChain mainnet (EIP-155 chain ID 995, native currency ...23.4 5ireChain Native (Substrate) RPCSubstrate/Polkadot-SDK RPC surface of the 5ireChain node, reached over WebSocket (default port 9944) and co...23.4 5ireChain Thunder Testnet JSON-RPCEthereum-compatible JSON-RPC 2.0 endpoint for the 5ireChain Thunder testnet (EIP-155 chain ID 997, native c...23.4 Phantom Solana Provider APISolana wallet provider injected at window.phantom.solana exposing connect, disconnect, signMessage, signIn ...23.4 DeSo Backend APIThe HTTP API served by every DeSo node. It exposes transaction-construction endpoints (social, financial, N...22.7 Skynet Web3 APISky Mavis indexed Web3 API for querying accounts, NFTs, blocks, collections, contracts, and transactions on...20.4 String APIREST API for String's fiat-for-Web3-gaming platform — quotes and transactions (fiat on/off ramp, NFT purcha...18.3 Faraway Platform APIThe Faraway Platform API surfaces the developer platform behind Faraway's interoperable gaming ecosystem. I...18.0 Co:Create APIREST API for token-driven communities on Polygon: users and hosted wallets; ERC-20 / ERC-721 / ERC-1155 and...17.9 Me Protocol PaaS APIHosted Platform-as-a-Service REST API for Me Protocol — the backend behind the embeddable rewards SDKs. Aut...16.4 Boardroom Governance APIThe Boardroom Governance API helps developers fetch and display governance data across DAOs and networks. P...15.0 RACE ProtocolDeveloper guide and SDK/CLI surface for writing, publishing, and running WASM game bundles on the RACE Prot...12.4

Minimal 4 Almost no public developer surface

xRocket Exchange APIREST API for creating/canceling market/limit orders, retrieving order books, tracking pair rates, executing...10.2 xRocket Pay APIREST API (v2) to manage cheques, transfers, invoices, withdrawal links, withdrawals, mass transfers and que...10.2 PoolPool.com offers Web3 domain registration and distribution services with partner integration available to IC...8.6 RLY Protocol Mobile ToolkitOpen-source web3 mobile toolkit exposed as first-party SDKs (React Native/Expo, Flutter, Unity) plus TypeSc...7.8

Companies reaching this through an API (5)

These companies publish an API, specification or operation carrying “Web3” 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.

Ankr Crypto.com Hyperledger Nervos Vesper Finance

Score breakdown

Frequency

76.0

log-scaled weighted occurrences

Breadth

14.5

spread across providers

Quality lift

30.4

mean composite of providers using it

Cohesion

55.3

strength of nearest seed neighbor

Where this tag comes from

Provider tag529

Api tag63

Cohort brief

Auto-generated

The 496 providers in the APIs.io catalog tagged Web3, scored on the Kin Score. Every figure below is computed from the catalog — nothing here is written.

Providers

496

all scored

Mean Kin Score

27.4

+3.5 vs catalog 23.9

Mean Agent Readiness

14.3

+2.3 vs catalog 12

Spread

1.5–69.1

median 28.1 · σ 15.4

How the 496 split by band

Exemplar 2Strong 19Developing 103Thin 148Emerging 129Minimal 95

Facet averages, against the whole catalog

Facet	This cohort	Catalog	Difference	Scored
Developer Ergonomics	36.6	23.4	+13.2	496
Contract Quality	25.5	19.8	+5.7	496
Discoverability	66.6	61.2	+5.4	496
Operational Transparency	17.2	13.9	+3.3	496
Contract Governance	5.3	6.4	-1.1	496
Access Clarity	21.8	26.5	-4.7	496

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)	8%	10%	-2
MCP server (first-party)	14%	13%	+1
Agent Skills	0%	0%	0
OAuth scopes	3%	11%	-8
Security	98%	96%	+2
Arazzo workflows	2%	2%	0
Governance rules	13%	14%	-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 Immutable 69.1
2 Solana 67.1
3 Solidus Labs 65.1
4 Covalent 63.1
5 Zerion 62.9
6 OpenZeppelin 61.6
7 Chainstack 59.5
8 Aptos 58.8
9 Coinflow 58.7
10 Biconomy 58.3

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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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Web3

Providers using this tag (525)

APIs with this tag (62)