89 APIs

Alby

Lightning wallet API for micropayments and web monetization.

Payments: Payments

What can you build?

  • Micropayments
  • Bitcoin web monetization
Open Source
Free
Freemium
Anchor

Solana development framework for programs, tests, and IDLs.

Developer Experience: RPC

What can you build?

  • Smart contract dev
  • Program testing
Open Source
Free
API3

First-party oracle network with dAPI feeds and Airnode integrations.

Oracles & Real World Data: Oracles, Market Data

What can you build?

  • dAPI feeds
  • Airnode integrations
Open Source
Free
Freemium
Aptos SDK

Official Aptos SDK for Move contracts, accounts, and transactions.

Developer Experience: DeFi

What can you build?

  • DeFi apps
  • Token launchpads
Open Source
Free
Axelar

Cross-chain SDK for bridging assets and interchain dapps.

Infrastructure

What can you build?

  • Bridged assets
  • Interchain dapps
Open Source
Free
Freemium
Aztec

Private smart contracts and shielded execution on Ethereum.

Privacy: Privacy

What can you build?

  • Private transfers
  • Shielded DeFi
Open Source
Free
Capsule

Embedded wallet SDK for in-app wallets and gasless UX.

Wallets: Embedded Wallets, Account Abstraction

What can you build?

  • In-app wallets
  • Gasless UX
Free
Freemium
Ceramic

Decentralized data network for portable user profiles.

Identity: Social Login

What can you build?

  • User profiles
  • Portable reputation
Open Source
Free
Freemium
Chronicle

Decentralized oracle network for price feeds and RWA data.

Oracles & Real World Data: Oracles, Market Data

What can you build?

  • Price feeds
  • RWA data
Free
Freemium
Circle

USDC issuance, treasury, and programmable wallet APIs.

Payments: Stablecoins, Treasury, Custody

What can you build?

  • Crypto neobank
  • Payroll app
Free
Freemium
CosmJS

TypeScript client for Cosmos SDK chains and IBC transfers.

Developer Experience: Cross-chain

What can you build?

  • IBC dapps
  • Chain interactions
Open Source
Free
Dialect

Solana messaging and notification rails for wallets and apps.

Messaging & Social: Messaging, Notifications

What can you build?

  • Wallet notifications
  • In-app alerts
Free
Freemium
Dynamic

Wallet and auth SDK for multi-wallet login and gated dapp access.

Authentication: Wallet Login, Embedded Wallets, Social Login

What can you build?

  • Multi-wallet login
  • Gated dapp access
Free
Freemium
ENS

Ethereum Name Service for human-readable onchain identity.

Identity

What can you build?

  • Human-readable addresses
  • On-chain profiles
Open Source
Free
Freemium
Farcaster

Decentralized social protocol for feeds, frames, and mini apps.

Messaging & Social: Social, Messaging

What can you build?

  • Mini apps
  • Social graphs
Open Source
Free
Helius

Solana RPC, webhooks, and enriched transaction APIs.

Infrastructure: RPC, Indexing, NFT

What can you build?

  • NFT indexing
  • Real-time transaction alerts
Free
Freemium
Hyperliquid

High-performance perpetuals exchange with public API.

Trading: Perps, Trading API, Market Data, Trading Bots

What can you build?

  • Trading Platform
  • Trading Bot
Free
Freemium
Immunefi

Bug bounty and audit platform for Web3 protocols.

Bug Bounty: Bug Bounty, Hackathons

What can you build?

  • Bug bounty platform
  • DeFi protocol launch
Free
Freemium
Jupiter SDK

Solana swap aggregator SDK for routing and DCA strategies.

DeFi Primitives: DeFi, Trading API

What can you build?

  • Token swaps
  • DCA bots
Open Source
Free
LND

Lightning Network daemon for channels, invoices, and Bitcoin payments.

Payments: Payments

What can you build?

  • Payment channels
  • Bitcoin apps
Open Source
Free
Metaplex

NFT standard and SDK for digital assets on Solana.

Data: NFT

What can you build?

  • NFT minting
  • Digital asset marketplaces
Open Source
Free
Mysten Labs SDK

Official Sui TypeScript SDK for objects, transactions, and wallets.

Developer Experience: NFT

What can you build?

  • Object-based dapps
  • NFT platforms
Open Source
Free
Nansen

Wallet intelligence and smart-money analytics for onchain research.

Analytics: Analytics, Market Data

What can you build?

  • Smart money trackers
  • Wallet profilers
Freemium
Nodit

Multichain RPC and indexing with Aptos-first developer APIs.

Infrastructure: RPC, Indexing

What can you build?

  • Multichain indexing
  • Event tracking
Free
Freemium
Openfort

Game-focused wallet infrastructure with session keys.

Wallets: Embedded Wallets, Account Abstraction

What can you build?

  • In-game wallets
  • Session keys
Free
Freemium
Pimlico

ERC-4337 infrastructure for bundlers, paymasters, and smart accounts.

Gasless & Paymaster: Gasless, Account Abstraction

What can you build?

  • Gasless transactions
  • Smart accounts
Free
Freemium
Privy

Wallet onboarding and embedded wallet infrastructure for apps.

Authentication: Wallet Login, Embedded Wallets, Social Login, Account Abstraction

What can you build?

  • Wallet Login
  • Embedded Wallet Apps
Free
Freemium
Semaphore

Zero-knowledge groups for anonymous signaling and private identity.

Privacy: Privacy

What can you build?

  • Anonymous voting
  • Private identity
Open Source
Free
Shinami

Sui node infrastructure and gas station for sponsored transactions.

Gasless & Paymaster: Gasless, RPC

What can you build?

  • Gasless txs
  • Sponsored wallets
Free
Freemium
Shyft

Solana APIs for transaction parsing and wallet activity feeds.

Data: Indexing, Analytics

What can you build?

  • Transaction parsing
  • Wallet activity feeds
Free
Freemium
Skip Protocol

MEV-aware routing and cross-chain swap infrastructure for Cosmos.

DeFi Primitives: Cross-chain, DeFi, Trading API

What can you build?

  • Cross-chain swaps
  • Relayer infra
Open Source
Free
Freemium
Solana

High-performance L1 for scalable consumer and DeFi applications.

Infrastructure: RPC, NFT

What can you build?

  • Consumer dapps
  • NFT platforms
Free
SQD

Decentralized data lake for historical on-chain queries.

Data: Indexing, Analytics, Market Data

What can you build?

  • Historical queries
  • DeFi analytics
Open Source
Free
Freemium
Stacks SDK

SDK for Bitcoin-anchored smart contracts on the Stacks layer.

Developer Experience: DeFi, NFT

What can you build?

  • DeFi on Bitcoin
  • NFTs on Bitcoin
Open Source
Free
Supabase

Open-source Firebase alternative with Postgres and auth.

Authentication: Social Login, Passkeys

What can you build?

  • SocialFi app
  • Bug bounty platform
Open Source
Free
Freemium
Tellor

Permissionless oracle for custom data feeds and dispute resolution.

Oracles & Real World Data: Oracles

What can you build?

  • Custom data feeds
  • Dispute systems
Open Source
Free
TON SDK

SDK for The Open Network and Telegram-native mini app payments.

Developer Experience: Payments

What can you build?

  • Mini app payments
  • Bot monetization
Open Source
Free
XMTP

Wallet-to-wallet messaging protocol for encrypted onchain DMs.

Messaging & Social: Messaging, Wallet Login

What can you build?

  • Encrypted DMs
  • In-app chat
Open Source
Free
ZeroDev

Account abstraction toolkit with session keys and sponsored gas.

Gasless & Paymaster: Gasless, Account Abstraction

What can you build?

  • Session keys
  • Sponsored gas
Free
Freemium