On-chain data: MCP servers, A2A agents and x402 APIs

• whale.hugen.tokyo Live x402

  Look up any Ethereum address — returns entity labels, name tags, and categories from 412K+ labeled addresses. AI agent API for on-chain identity resolution (2 paid endpoints on whale.hugen.tokyo.)

  x402 paid API · 2 endpoints

• whale.lonestaroracle.xyz Live x402

  Large on-chain transaction monitor — whale movements on Base, Ethereum, and Robinhood Chain with AI pattern analysis

  x402 paid API · 1 endpoint

• x402-bazaar-rank.x402-bazaar-rank-worker.workers.dev Live x402

  Use when an agent needs the top x402 services tagged 'pay-per-call'. Returns Highest-demand x402 services tagged 'pay-per-call': ranked by 30-day unique paying wallets, with calls, price, network and calls-per-payer for…

  x402 paid API · 12 endpoints

• x402-crypto-data.vercel.app Live x402

  Top DeFi yield pools with APY/TVL, filterable by chain (DefiLlama). (2 paid endpoints on x402-crypto-data.vercel.app.)

  x402 paid API · 2 endpoints

• x402-defi-signals.onrender.com Live x402

  One-call market snapshot: BTC/ETH/SOL spot prices with 24h change plus the Crypto Fear & Greed index. The cheapest way for an agent to establish market context. (2 paid endpoints on x402-defi-signals.onrender.com.)

  x402 paid API · 2 endpoints

• x402-doctor.onrender.com Live x402

  Why is my x402 endpoint broken? Diagnose and debug an x402 payment endpoint (or MCP server) when payments fail: checks the 402 challenge, accepts[] (network, payTo, amount, asset), resource URL, Solana settlement readin…

  x402 paid API · 3 endpoints

• x402-echo-service.onrender.com Live x402

  Current gas conditions on Base. POST {} and receive the legacy gas price and the EIP-1559 base fee of the latest block, in wei and gwei. Useful for agents deciding whether to transact now or wait. (12 paid endpoints on…

  x402 paid API · 12 endpoints

• x402-endpoints.onrender.com Live x402

  Look up any Legal Entity Identifier (LEI) for company information lookup and counterparty / know-your-business (KYB) identity against the official GLEIF global registry — returns legal name, status, jurisdiction, legal…

  x402 paid API · 5 endpoints

• x402-gateway-production-1f21.up.railway.app Live x402

  Extract webpage metadata, OpenGraph and JSON-LD. Returns title, description, canonical URL, robots directives, headings, Open Graph, Twitter cards and structured data for one public URL per paid request. (12 paid endpoi…

  x402 paid API · 12 endpoints

• x402-market.kore-app.workers.dev Live x402

  Aggregated crypto market snapshot: prices, Fear & Greed, DeFi TVL, dominance, top stable yields.

  x402 paid API · 1 endpoint

• x402-mcp.onrender.com Live x402

  Should I submit this Base transaction now, and at what fee? One call returns submit-or-wait, max fee per gas and priority fee in gwei (EIP-1559), and the estimated cost in USD for an ETH transfer, USDC ERC-20 transfer,…

  x402 paid API · 9 endpoints

• x402-seller-pmlm.onrender.com Live x402

  Ask a question, get a short cited answer in one call. Returns a 1-3 sentence answer, key points tied to source ids, and the sources used (typically 1-5: title, URL, publisher, date, supporting quote), plus confidence wi…

  x402 paid API · 10 endpoints

• x402-stock-indicators.vercel.app Live x402

  Crypto Fear & Greed Index: current reading (0-100, Extreme Fear to Extreme Greed) plus 7-day and 30-day sentiment trend (rising/falling/flat with the average and point change), not just a single snapshot number. Not tic…

  x402 paid API · 9 endpoints

• x402-store.dgdb.workers.dev Live x402

  Decode an EVM signature request (EIP-712 typed data, Permit/Permit2, or ERC-20 approve calldata) into a structured intent: what token, which spender, how much, until when, plus risk_flags and an action_hint. Determinist…

  x402 paid API · 2 endpoints

• x402-tools-production-2755.up.railway.app Live x402

  Use before sending funds to check that a recipient isn't sanctioned. Screens up to 50 crypto addresses (ETH/EVM, BTC, TRX, USDT, SOL and more) against the addresses on the US Treasury OFAC SDN list, refreshed daily, ret…

  x402 paid API · 12 endpoints

• x402-web-extract.senpi-agent.workers.dev Live x402

  Real-time USDC-denominated spot price for any EVM token by contract address or common symbol. Pass ?address=0x... (or ?symbol=ETH) and ?chain=base|ethereum|polygon|arbitrum|optimism|avalanche. Returns price, symbol, dec…

  x402 paid API · 2 endpoints

• x402check.arden-instance.workers.dev Live x402

  Read-only Base mainnet data: GET /base/block, /base/tx?hash=, /base/balance?address=, /base/erc20?token=&holder=, /base/gas. Small JSON payloads over a Base node; pay ~$0.002 USDC on Base per call. (2 paid endpoints on…

  x402 paid API · 2 endpoints

• x402factory.ai Live x402

  Base coin price mini-endpoint for major tokens only. Returns spot prices and 24h stats for well-known tickers like btc, solana, eth, xmr, ltc and other large-cap coins, never microcaps. Pass an optional ticker to get a…

  x402 paid API · 2 endpoints

• x402pulse.dev Live x402

  Polymarket leaderboard re-ranked by skill, not size: top traders by edge over the odds paid, return and consistency, for day, week, month or all time, optionally per category (sports, politics, crypto, economy). Exposes…

  x402 paid API · 12 endpoints

• x402tap.com Live x402

  Live current weather conditions for any city, sourced from Open-Meteo (16 paid endpoints on x402tap.com.)

  x402 paid API · 12 endpoints

• xhagents.xyz Live x402

  Ask the XH Agents knowledge base (15 field notes on infrastructure, x402 and agent tooling) (24 paid endpoints on xhagents.xyz.)

  x402 paid API · 12 endpoints

• Cult OS x402

  Paid developer services for humans and agents on Base, with selected services on Arc, and Solana USDC for toolkit services, developer tools and signal feeds. Use live HTTP 402 terms before payment.

  x402 paid API · 12 endpoints · check 90/100

• glim.sh x402

  One remote endpoint gives your agent live data from Twitter, Reddit, the open web, GitHub and more. No API keys, no scraping stack - just connect the URL and go.

  x402 paid API · 12 endpoints · check 90/100

• Spraay x402 Gateway x402

  Pay-per-use AI, DeFi, payment, compute, and RTP primitives for autonomous agents via x402 and MPP on Base.

  x402 paid API · 12 endpoints · check 90/100

• AgentHub by Allium x402

  150+ chains, in any AI client. Install the Allium MCP server, skill, or CLI in one command — or skip the API key entirely and pay per query in USDC.

  x402 paid API · 2 endpoints · check 80/100

Related capabilities

x402 paid APIsTrading & marketsAgent infrastructureSecurity & trustResearchCrypto market dataMaps & travelWeb scraping

How to use one

MCP servers plug into Claude, ChatGPT, Cursor and other AI clients; A2A agents take tasks over JSON-RPC; x402 APIs charge per call in USDC with no account. Guides: A2A vs MCP · How to call an A2A agent · x402 for agents.

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