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 →

Strong 1 Solid coverage with minor gaps

Fireblocks Tokenization APIDeploy, mint, burn, and manage tokens across the chains supported by Fireblocks Tokenization Engine. Covers...64.2

Developing 7 Usable, with meaningful gaps to close

OpenZeppelin Contracts API ReferenceThe OpenZeppelin Contracts library provides a comprehensive collection of modular, reusable, and secure Sol...50.0 OpenZeppelin Monitor APIOpenZeppelin Monitor is an open-source blockchain monitoring service that watches for specific on-chain act...50.0 Altimate AI SMART_CONTRACTS APIThe SMART_CONTRACTS API from Altimate AI — 1 operation(s) for smart_contracts.47.7 Bitbond Token Tool APIProgrammatic token and smart-contract deployment API for Token Tool. Enables minting, burning, transferring...44.7 Stellar RPC APIThe Stellar RPC API (formerly Soroban RPC) is a JSON-RPC interface for interacting with Soroban smart contr...43.0 Routescan Etherscan-Compatible Contract APIAccess verified smart contract ABIs, source code, and creation transaction data. Supports contract source c...41.9 Routescan Etherscan-Compatible Logs APIQuery event logs emitted by smart contracts using filter parameters including address, block range, and up ...41.9

Thin 33 Limited public surface area

TzKT Big Maps APIThe Big Maps API indexes all Tezos big map allocations across smart contracts, exposing individual key-valu...39.1 TzKT Contracts APIThe Contracts API provides access to Tezos smart contract metadata, storage, entrypoints, views, and code. ...39.1 Blast Gas Revenue APIProgrammatic interface for dApps to claim back a share of the net gas revenue generated by their contracts ...37.6 HyperEVM JSON-RPCEVM-compatible JSON-RPC endpoint exposed by Hyperliquid for deploying and interacting with smart contracts ...37.2 SuperRare Smart Contracts - Assets (ERC-721)SuperRare ERC-721 NFT asset contracts including shared minting contracts (SuperRareV1, SuperRareV2), creato...36.0 SuperRare Smart Contracts - The BazaarUnified marketplace and auction house smart contract on Ethereum that enables reserve-price auctions, sale ...36.0 Polygon ID Verifier SDKThe Verifier SDK enables web2 and web3 applications to authenticate users based on verifiable credentials w...35.9 THORChain Smart Contracts APIThe Smart Contracts API from THORChain — 2 operation(s) for smart contracts.35.9 Thought Machine Vault Core APIVault Core is Thought Machine's cloud-native core banking engine. Its API surface spans a REST Core API for...35.5 BanQu Smart Contracts APIAutomation workflows that react to system events35.3 Manifold Creator Core Smart ContractsOpen-source Solidity smart contract framework for deploying ERC721 and ERC1155 creator-owned NFT contracts....35.3 Manifold Marketplace ContractsSmart contract system powering Manifold Gallery listings and Marketplace Widgets. Supports Auction Listings...35.3 Manifold Royalty RegistryOn-chain smart contract registry that serves as a single source of truth for NFT royalties across all major...35.3 Hegic Smart Contracts (Arbitrum)Hegic's core options protocol is implemented as smart contracts on Arbitrum One. Developers can interact di...35.1 HyperIndex GraphQL APIAuto-generated GraphQL API exposing indexed smart contract events from any EVM-compatible chain. HyperIndex...33.9 Cairo LanguageCairo is StarkWare's Turing-complete language for creating provable programs and the canonical smart contra...33.6 EigenLayer Core ContractsSolidity smart contracts that implement the EigenLayer restaking protocol - StrategyManager, DelegationMana...33.5 Scroll ContractsSolidity contracts that implement the Scroll rollup - L1 / L2 messengers, gateways, ScrollChain commit/fina...33.0 Tenderly REST APICore REST API for managing Tenderly projects including smart contract simulations, alerts, Web3 Actions, co...32.9 Vesper Contracts API ReferenceSmart contract interface reference for Vesper pools, strategies, PoolAccountant, PoolRewards, and related o...32.5 BNY Data On-ChainBNY Data On-Chain publishes BNY-attested data on-chain so on-chain consumers can read it directly from smar...32.4 Mantle Liquid Staking Protocol (mETH)Mantle LSP issues mETH, a liquid staking token backed by ETH staked to Ethereum validators. Smart contracts...32.2 Tatum Smart Contract APIREST API to deploy, invoke, and read smart contracts on EVM and other chains.29.8 XMTP App Chain RPC APIJSON-RPC API for the XMTP Layer-3 appchain built on Arbitrum and settling to Base. Used for smart contract ...29.7 Band VRFBand VRF is a provably fair, verifiable random function for on-chain randomness. It allows smart contracts ...29.6 Foundation Smart Contract APIEthereum smart contract interface for direct on-chain interaction with Foundation marketplace contracts. Su...29.2 Curve Smart ContractsCurve's primary surface for swaps and liquidity is a set of audited Vyper smart contracts deployed across m...29.1 Blockscout Smart Contracts APIThe Smart Contracts API from Blockscout — 3 operation(s) for smart contracts.28.7 Push Chain Contract Helpers (UEAFactory)On-chain contract helpers deployed at 0x00000000000000000000000000000000000000eA (UEAFactory). getOriginFor...28.7 Proof of Liquidity ProtocolBerachain's economic coordination layer — Reward Vaults, BGT, and validator boost contracts that turn block...28.4 Raydium Solana ProgramsRaydium's swap, AMM, CLMM, farm, and launchpad programs deployed on Solana.28.3 Hiro Smart Contracts APIRead-only endpoints to obtain Clarity smart contract details27.7 Hyperledger Fabric APIHyperledger Fabric is a permissioned distributed ledger platform. Programmatic access is provided via the F...26.5

Emerging 19 Early or largely undocumented

Sei EVM JSON-RPC APIEthereum-compatible JSON-RPC API for interacting with Sei's EVM layer. Supports standard Ethereum methods f...25.1 Pendle Boros Core Smart ContractsOpen-source Solidity core for Boros — the order-book / margin venue that lets traders long or short yield r...24.6 Pendle Router Static (On-chain Helper)RouterStatic is an on-chain read-only helper contract that exposes simulation and quoting functions used by...24.6 Pendle SY (Standardized Yield) ContractsPublic repository of Standardized Yield (SY) wrapper contracts that adapt every supported yield-bearing ass...24.6 Pendle V2 Core Smart ContractsOpen-source Solidity implementation of the Pendle V2 protocol — Router, MarketFactory, Market, PT, YT, vePE...24.6 Rocket Pool Protocol API (rocketpool-js)The rocketpool-js library is a TypeScript/JavaScript client for the Rocket Pool protocol's deployed smart c...24.5 Aave V3 Pool (Smart Contracts)Core Aave V3 protocol contracts — Pool, L2 Pool, Wrapped Token Gateway, PoolAddressesProvider, Pool Configu...23.6 Aave V4 Protocol (Smart Contracts)Next-generation Aave V4 protocol implementation with unified liquidity layer, hub-and-spoke architecture, a...23.6 Helium Program Library (Solana)Open-source Solana on-chain programs and TypeScript client SDKs powering the Helium DAO, sub-DAOs, HNT / IO...22.7 Sudoswap Smart Contract APIOn-chain smart contract interface for the Sudoswap AMM protocol. Developers interact with LSSVMPairFactory ...21.8 Lens Protocol Smart ContractsThe Lens v3 smart contracts implement the onchain social graph on Lens Chain. Core primitives include Accou...21.0 5ireChain Mainnet JSON-RPCEthereum-compatible JSON-RPC 2.0 endpoint for the 5ireChain mainnet (EIP-155 chain ID 995, native currency ...20.8 Acala EVM+ JSON-RPCAcala EVM+ exposes a standard Ethereum JSON-RPC API through the EVM+ RPC Adapter, which wraps Substrate RPC...19.4 BNY Data On-ChainPublic, smart-contract-only product that broadcasts BNY-attested fund accounting data to public blockchains...19.1 Hexagate (Chainalysis)Web3 security product (acquired by Chainalysis) that monitors smart contracts and on-chain activity in real...18.3 Alchemix Smart Contract APIThe primary developer interface for Alchemix is its on-chain smart contracts deployed on Ethereum Mainnet, ...17.5 Balancer Smart ContractsVault and Router smart contracts where swaps and liquidity actions are executed on-chain. v2 and v3 version...17.4 Pump.fun On-Chain Program (Solana)The deployed Solana program that implements Pump.fun's token factory and bonding-curve market. Integrators ...15.4 Quant Overledger APIOverledger APIs provide a single unified interface for building cross-ledger applications, including endpoi...11.9

Score breakdown

Frequency

62.5

log-scaled weighted occurrences

Breadth

4.3

spread across providers

Quality lift

31.3

mean composite of providers using it

Cohesion

29.7

strength of nearest seed neighbor

Where this tag comes from

Provider tag122

Api tag60

Openapi tag5

Openapi op tag28

Cohort brief

Auto-generated

The 157 providers in the APIs.io catalog tagged Smart Contracts, scored on the Kin Score. Every figure below is computed from the catalog — nothing here is written.

Providers

157

all scored

Mean Kin Score

+5.3 vs catalog 20.7

Mean Agent Readiness

11.7

+2.0 vs catalog 9.7

Spread

3.1–66.8

median 25.1 · σ 13.2

How the 157 split by band

Exemplar 1Strong 3Developing 21Thin 50Emerging 58Minimal 24

Facet averages, against the whole catalog

Facet	This cohort	Catalog	Difference	Scored
Developer Ergonomics	33.5	17.9	+15.6	157
Discoverability	67.7	60.4	+7.3	157
Contract Quality	23.3	17.5	+5.8	157
Operational Transparency	17	11.3	+5.7	157
Contract Governance	5.4	6.4	-1	157
Access Clarity	20.2	22.3	-2.1	157

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)	18%	16%	+2
MCP server (first-party)	6%	7%	-1
Agent Skills	0%	0%	0
OAuth scopes	1%	9%	-8
Security	97%	88%	+9
Arazzo workflows	0%	2%	-2
Governance rules	17%	13%	+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 Solidus Labs 66.8
2 fireblocks 64.2
3 0x 58.3
4 Aptos 57
5 Algorand 50.3
6 OpenZeppelin 50
7 Oumla Ltd 49.9
8 Horizon Blockchain Games 48.1
9 Altimate AI 47.7
10 Digital Asset 47.7

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Smart Contracts

Providers using this tag (157)

APIs with this tag (60)