x402: agent payments over HTTP

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.

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

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

x402-ping is a API and SDK on Base.

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

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

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

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

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.

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

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.

Skim is a data service for agents on Base.

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.

US stock market data API (formerly Polygon.io); agents buy it per request over x402 at agent.massive.com with no account.

Ogena token risk is a data service for agents on Solana, Base.

Trading-intelligence API for Robinhood Chain and Solana (KOL trades, DEX tape, deployer reputation) with MCP, SDKs, ElizaOS plugin and x402 pay-per-call.

x402 Bazaar Rank is a data service for agents on Base, Arbitrum, Polygon.

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

Onchain intelligence API that attributes wallets to entities; agents can pay per request in USDC over x402.

Onchain market metrics (MVRV, exchange flows, supply distribution) sold per call over x402, no API key.

Agent-native blockchain data API: single-purpose REST 'Skills', an MCP server (@one-source/mcp) and an M10 natural-language layer, paid per call via x402 or a $20/mo key.

Pay-per-query access to subgraphs on The Graph Network over x402, paid in USDC on Base with no API key.

Open HTTP 402 payment protocol, now at the x402 Foundation: agents pay per request in stablecoins, and by a newly merged spec, in bitcoin over Lightning.

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.

TypeScript SDK to put a payment plan in front of an agent: credit or time-based plans, x402 access tokens, and A2A and MCP integrations.

Stripe's merchant-side agent payments: charge agents per call over MPP (cards via SPTs, USDC on Tempo and Solana) or x402 (USDC on Base), settled to your Stripe balance.

Managed AWS service that lets agents pay for APIs, MCP servers and content over x402 and MPP, using Coinbase CDP or Stripe Privy wallets with per-session budgets.

Neuronto Payments is an API and SDK.

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

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

Multi-tenant x402 facilitator for Lightning built on Nostr Wallet Connect. Predates the merged lnbtc spec and still advertises bip122.

Circle Gateway batched settlement for gas-free USDC payments down to 0.000001 USDC, with buyer and seller SDKs for x402.

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.

Stablecoin-to-real-world spending for agents: prepaid and gift cards, Venmo/PayPal/ACH payouts. Callable via x402 (USDC on Base/Solana) or MCP.

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

NanoParse is an MCP server on Base.

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

Public, keyless catalog of x402 payment-gated services indexed by the CDP facilitator, searchable by intent via REST, TypeScript SDK or a hosted MCP server.

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

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

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

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

Non-custodial onchain yield API for agents: discover, assess, enter and exit 3,300+ staking/lending/RWA yields over one MCP server, paid per call via x402.

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

Coinbase's remote MCP server: an agent signs in with Coinbase OAuth to trade crypto, US stocks/ETFs and futures, and pay for data over x402.

Binance's official agent access layer. It pairs a hosted OAuth MCP server for spot, margin, convert and futures in a dedicated sub-account with Skills Hub and x402 tools.

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.

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.

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

Circle's official agent toolkit: Circle CLI, policy-controlled Agent Wallets, gasless USDC Nanopayments, an x402 facilitator and an agent marketplace.

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

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.

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

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

Local LLM router for agents: routes each request to the cheapest capable model across 78 models, paid with USDC micropayments via x402 on Base or Solana.

Coinbase's toolkit for giving AI agents wallets and the ability to take onchain actions.

Circle's EVM-compatible L1 with USDC as gas, live on mainnet since Sep 16, 2026. It is positioned for payments and agent activity, with App Kits and the Arc Studio coding agent.

Network and Python SDK for verifiable AI inference, a model hub and LLM calls paid through x402.

npx CLI that scaffolds an ERC-8004 agent project with A2A and MCP servers and optional x402 payments, for EVM chains and Solana.

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.

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.

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

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

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

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

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

Arbitrum-native, MCP-first agent framework with A2A and x402 support, backed by an Arbitrum Foundation grant program.

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

Framework and tooling for building AI agents for onchain commerce.

minia2a is a marketplace where agents find and pay for services on Base.

One gateway for agents to discover, call and pay for 800+ API endpoints from 50+ providers. Pay per call via x402, MPP or Circle Nanopayments.

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

PulseFeed checks an x402 endpoint before an agent pays it (liveness, a 0-100 score, receiver and price flags) and tracks changes to MCP servers and npm packages. Ships a guard SDK, an MCP server, and Vercel AI SDK and LangChain tools.

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.

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.

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

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.

Open-source AI trading terminal: an LLM drives strategy inside hard-coded risk limits across 9 exchanges. Model usage can be paid via x402 USDC on Base.