Which crypto APIs and SDKs exist for onchain agents?

SDK from World (Tools for Humanity) that lets AI agents present a zero-knowledge proof a verified human authorized them, combined with x402 payments.

Web search and content-retrieval API built for AI; /search and /contents can be paid per request over x402.

Official OpenSea agent skill and MCP server letting AI agents query NFT/token data and execute marketplace operations such as listing, offers, and token swaps.

An intent-based onchain execution engine and API that lets developers and agents bundle multi-step DeFi actions into a single transaction.

Cross-chain swap/settlement API solved by the NEAR Intents solver network; also an MPP payment method so agents pay 402s from any chain.

Uniswap-V4-based token launch protocol on Base with a TypeScript SDK and its own MCP server.

The official open-source Python SDK for programmatic trading on the Hyperliquid perpetuals DEX.

Drop-in OpenAI Python client with transparent x402 micropayment support.

Open standard maintained by OpenAI and Stripe for connecting buyers, their AI agents, and businesses to complete purchases.

Decentralized AI inference network with an OpenAI-compatible Inference API and open-source consumer and provider node software.

Ethereum standard providing on-chain identity, reputation, and validation registries for AI agents.

Farcaster developer platform providing APIs, SDKs, webhooks, and an agent skill for building and deploying agents that read and write Farcaster data.

Omnichain orderbook trading infrastructure exposing REST and WebSocket APIs and SDKs for DEX builders.

Pay-per-call gateway where AI agents reach 55+ LLMs, data, and tools through one endpoint, settled in USDC via x402 — no API keys.

Official Polygon Labs CLI giving AI agents session-scoped wallets, x402 payments, and ERC-8004 identity in one install.

A blockchain developer platform providing node infrastructure plus NFT, Token, and Transfers APIs and SDKs across many chains.

DePIN infrastructure providing agents with identity, wallets, and pay-per-request onchain settlement, with peaqOS skills for AI coding tools.

One OpenAI-compatible API for many LLMs with routing, fallbacks and cost tracking across providers.

RPC infrastructure provider offering endpoints, Streams, and indexing tools across many blockchain networks.

Coinbase's React component and TypeScript SDK library for building onchain apps and mini-apps on Base.

Open-source unified prediction-market API with a hosted MCP: market search, events, order books, and prices across venues.

Draft Ethereum standard defining an on-chain job-escrow protocol with evaluator attestation so AI agents can hire, deliver, and settle work without intermediaries.

Routing and settlement layer and CLI for agent-to-agent commerce, supporting EVM wallets, agent discovery, A2A messaging, x402 payments, and ERC-8004 identity.

x402-ping is a API and SDK on Base.

A small mainnet service paid with x402 over Lightning (lnbtc): digits of pi for 100 sats, with an agent SKILL.md and a Rust client.

Open standard co-developed by Google and Shopify for AI agents to discover, negotiate, and transact with any merchant across the full commerce journey.

Chainlink's hosted HTTP gateway and skill bundle: pay-per-call Data Streams prices and CRE-run onchain actions with gas covered, paid via x402 in USDC on Base.

CosmJS-based MCP toolkit for wallet queries, transactions, and contract deployment on Oraichain and Cosmos chains.

Protocol and SDKs (Python, TypeScript) for agents that register an ERC-8004 identity and record their work for reputation, with x402 payments.

Privacy-preserving x402 payments for agents on Base, with stealth addresses and TEE-encrypted inference, no accounts or API keys.

Ethereum standard for verifying ERC-8004 agents across five categories with a unified 0-100 risk score.

MCP package giving agents 190+ EVM DeFi tools — swaps, bridges, limit orders, exchange trading — with confirmation gating.

Omnichain token launchpad with a dedicated MCP server and white-label API for agent-run token launches.

Private, uncensored AI inference platform with an OpenAI-compatible API used by agent builders.

Official Node.js SDK for Virtuals' Agent Commerce Protocol — event-driven agent-to-agent job and escrow flows.

Official LangChain toolkit for reading and writing value/app/owner state on the AI Network layer-1 blockchain.

Serverless platform to deploy and call open-source AI models through an OpenAI-style API, run as Bittensor Subnet 64.

TypeScript and Python SDKs to register an agent on ERC-8004, publish its MCP and A2A endpoints, and search for or give feedback on other agents.

Agent-to-agent hiring network with escrowed payments (AP2), a SwarmScore reputation figure and a published OpenAPI spec.

Official Crypto.com Exchange command-line client — scriptable trading API access with a TUI for humans.

Lightning Labs toolkit giving LangChain agents Bitcoin/Lightning balance access and L402-authenticated API calls.

Web Search and Finance Research APIs that agents can call with no key and pay per request in USDC over x402.

Agent-only token launch, trading, and liquidity SDK on Base with anti-human authentication and a chat-based launcher.

Visa protocol that lets merchants authenticate trusted AI shopping agents via cryptographic signatures, with x402 interoperability into traditional payment rails.

Crypto-to-gift-card and mobile top-up commerce platform with a Skills/MCP/API surface for agents to buy real-world goods with stablecoins.

REST API suite (accounts, cards, yield, trading data) for building stablecoin-native fintech on Solana, from the Squads Labs team.

OpenAI-compatible AI inference service running open models on Akash Network decentralized compute.