x402: agent payments over HTTP

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

Open payment protocol enabling agents and apps to pay for APIs over HTTP using stablecoins.

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.

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

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

Open protocol from Google for secure agent-led payments across traditional and crypto rails, with a crypto-native x402 extension built with Coinbase, Ethereum Foundation, and MetaMask.

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

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

Solana-first x402 payment facilitator enabling usage-based, machine-to-machine payments for AI agents.

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

An x402 micropayment gateway and transparent proxy that adds pay-per-request paywalls to existing APIs without backend rewrites.

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

Toolkit giving AI agents gasless access to crypto wallets and onchain functionality.

Non-custodial toolkit from Trust Wallet (MCP server, CLI, and SDK) that lets AI agents read and transact across 25+ chains within user-defined rules.

Crypto execution layer and cross-chain wallet that lets agents and users trade, bridge, and manage assets via natural language, plus a skills marketplace and an x402 cloud for spinning up pay-per-call agent endpoints.

Gives any AI agent a crypto wallet to pay x402 APIs, receive USDC, and check balances.

Wallet-as-a-Service infrastructure for AI agents.

Non-custodial MPC wallet for AI agents with cryptographically enforced human rules, plus a WaaS Skill for building wallet apps via natural language.

Real-time Ethereum L2 (~10ms blocks) with a native agent stack: the MOSS embedded wallet lets agents act under scoped, revocable permission policies — spend caps, contract allowlists, and expiry — without ever touching your keys.

Alchemy's payment proxy for AI agents — every API request is authenticated, metered, and settled automatically, so agents pay per call without keys or subscriptions.

Coinbase Developer Platform wallet infrastructure built for AI agents, with spend caps, gasless Base settlement, and native x402.

MCP server giving AI agents live data — markets, crypto, research, X — billed per call via x402 micropayments.

Bitcoin-native MCP server: BTC/STX wallets, L1 reads and transfers, Stacks, sBTC, and x402 payments.

GoPlausible's Algorand MCP: agent wallets, transaction building/signing, TEAL, DEX aggregation, full Algod/Indexer access.

Read-only Base mainnet MCP for x402: verify USDC settlements, parse x402 manifests, probe endpoints, decode payment payloads.

Plugin-based monorepo MCP: EVM+Solana wallets, DEX aggregation, x402 payments, CEX trading, market data, bridges.

MCP server that discovers x402-paid APIs via CDP Bazaar and handles USDC micropayments on Base.

Official Octav MCP exposing portfolio holdings, DeFi positions, NAV, and transaction history across 20+ chains.

Skill collection for EmblemAI agents — 200+ crypto tools across seven blockchains.

An autonomous agent/builder on Base publishing open-source crypto agent skills such as calldata decoding, proxy resolution, and protocol integrations.

Agent skills for OKX OnchainOS: wallet, token discovery, market data, and DEX swaps.

Web3 toolkit for Claude Code: 140 custody-free MCP tools for EVM and Solana DeFi, DEX, and perps.

Agent skill for Bitget Wallet: token swaps, cross-chain bridging, and gasless transactions.

Wallet and DeFi data provider offering portfolio, positions, transactions, PnL, and prices across many chains, with an agent-accessible API.

Onchain analytics platform with wallet labeling and smart-money tracking, offering an API with key-based and x402 access.

An onchain data network providing structured, AI-ready blockchain data across many chains, with API, CLI, MCP, and x402 access.

Explorer for the x402 ecosystem: transactions, sellers, origins, and resources across agentic commerce.

Commerce SDK for bootstrapping AI agents that can pay, sell, and transact onchain.

Framework and tooling for building AI agents for onchain commerce.

Ripple's starter kit for building agentic payment apps on the XRP Ledger, with x402 payments in XRP and RLUSD, an XRPL docs MCP server, and Claude wallet/payment skills.

Base-based marketplace where humans and AI agents post and complete tasks, with USDC locked in on-chain escrow, agent staking, and ERC-8004 identity/reputation.

An autonomous AI agent with its own wallet that spends USDC to get real work done.

An Optimism Superchain L2 focused on AI-driven onchain finance, with configurable rules-based trading agents.

Open-source privacy SDK that adds unlinkable, zero-knowledge payments on top of the x402 agent payment standard.

Pay-per-use security verification endpoints for AI agents, billed via x402 micropayments.

One-click deployment of Web3-native AI agents to Line, Kakao, and WhatsApp, each with its own wallet and onchain execution.

An ERC-8183 agent skill marketplace where builders register skills and agents discover, chain, and pay for them on-chain.

Research report analyzing on-chain AI-agent payments, finding agents settled roughly $73M across about 176M transactions over twelve months with USDC dominant.

Crypto research and data platform covering fundraising, metrics, signals, and news, with API-key and x402 agent access.