Hearth: x402 Pay-Safety & Discovery

Reliability

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How to connect

Add it to any MCP client that supports remote servers.

{
  "mcpServers": {
    "hearth-onchain-data": {
      "type": "http",
      "url": "https://138-197-15-135.sslip.io/mcp"
    }
  }
}

36 tools

• report_token

  Full token / contract due-diligence report (risk score + AI analyst write-up). One call, full due diligence on an ERC20 on Base, Ethereum, Arbitrum or Optimism before you buy, list, accept or integrate it. Combines: honeypot/tax/mint/blacklist/hidden-owner scan with 0-100 risk…

• report_wallet

  Wallet / counterparty intelligence dossier (risk flags + AI profile). Know who you're dealing with before you pay, accept funds from, or trade with an EVM address. One call combines: GoPlus security flags on Ethereum and Base (phishing, sanctioned, mixer, theft, fake-token…

• x402_seller_audit

  x402 seller listing audit: spec compliance, discoverability, buyer-trust score + prioritized fixes. For people who SELL x402 endpoints. Give your endpoint URL; Hearth probes it unpaid (GET, falls back to POST) and grades it 0-100 (A-F) on 23 checks that decide whether agents can…

• x402_precheck

  x402 pre-payment safety check: pay / caution / avoid. Before your agent pays an unknown x402 endpoint, check it ($0.005). Give an x402 URL and/or payTo; optional maxPrice to catch bait-and-switch. Live unpaid probe (GET then POST) parsing x402 v1 body AND v2 header; canonical…

• x402_precheck_batch

  Batch x402 precheck: up to 10 URLs in one call. Run the full hearth.precheck.v2 check on up to 10 x402 URLs at once ($0.025, i.e. $0.0025 each). Pass urls as a comma-separated list (or JSON body {"urls": "a,b"}). Returns one result per URL plus a summary of pay/caution/avoid…

• x402_discover

  Find the best x402 API for a task (ranked by real paying usage). Describe what you need (e.g. 'token holder analysis on base', 'web search', 'flight prices') and get the top x402 endpoints ranked by relevance and REAL payer quality: 30-day unique paying wallets, calls per payer…

• base_erc20_balance

  ERC20 token balance on Base. ERC20 balance of any wallet on Base, Ethereum, Arbitrum or Optimism (USDC by default) via balanceOf, with decimals applied. Deterministic, no LLM. Example output…

• base_token_info

  ERC20 token metadata on Base. Name, symbol, decimals, total supply and bytecode presence for a token contract on Base, Ethereum, Arbitrum or Optimism. Deterministic, no LLM. Example output: {"chain":"base","address":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","name":"USD…

• base_tx_status

  Transaction status on Base. Status of a transaction on Base, Ethereum, Arbitrum or Optimism: pending/success/failed, block, confirmations, from/to, gas used, log count. Deterministic, no LLM. Example output…

• base_wallet

  Wallet snapshot on Base. Native ETH balance, nonce (tx count) and whether the address is a contract, on Base, Ethereum, Arbitrum or Optimism. Deterministic, no LLM. Example output: {"chain":"base","address":"0x…","ethWei":"0","eth":"0","nonce":0,"isContract":false,"block":1}…

• evm_gas

  Gas price and fee estimate. Current gas price, base fee, suggested priority fee and EIP-1559 maxFee for Base, Ethereum, Arbitrum or Optimism, plus a 21000-gas transfer cost in native units. Deterministic, no LLM. Example output…

• evm_block

  Latest block or block by number. Block number, timestamp, hash, tx count, gas used/limit and base fee for the latest (or given) block on Base, Ethereum, Arbitrum or Optimism. Deterministic, no LLM. Example output…

• token_price

  Token USD price. Current USD price for a token contract on Base, Ethereum, Arbitrum or Optimism (or the chain's native ETH if no address), with symbol, decimals and confidence. Aggregated from public DeFi price feeds. Deterministic, no LLM. Example output…

• name_resolve

  ENS / Basename resolve. Resolve an ENS name (vitalik.eth) or Basename (jesse.base.eth) to an address, or an address to its verified primary ENS name. On-chain, deterministic, no LLM. Example output…

• nft_owner

  NFT owner (ERC-721). Current owner of an ERC-721 token (ownerOf) on Base, Ethereum, Arbitrum or Optimism. Deterministic, no LLM. Example output: {"chain":"base","contract":"0x…","tokenId":"1","owner":"0x…"}. Price: $0.0025 USDC on Base via x402 (pass the payment in…

• nft_metadata

  NFT metadata. tokenURI and resolved JSON metadata (name, description, image, attributes) for an ERC-721 or ERC-1155 token on Base, Ethereum, Arbitrum or Optimism. IPFS/Arweave resolved. Deterministic, no LLM. Example output…

• solana_balance

  Solana SOL balance. Native SOL balance (lamports and SOL) for any Solana address. Deterministic, no LLM. Example output: {"chain":"solana","address":"…","lamports":1000000000,"sol":"1","slot":1}. Price: $0.0025 USDC on Base via x402 (pass the payment in _meta["x402/payment"]).

• token_safety

  Token safety / honeypot / rug-risk check. Scam check for an ERC20 on Base, Ethereum, Arbitrum or Optimism: honeypot, buy/sell tax, mintable, owner can change balances, proxy, blacklist, open source, holder concentration, LP lock. Returns a 0-100 risk score, a verdict…

• wallet_portfolio

  Multi-chain wallet portfolio with USD values. One call: ETH, WETH, USDC and USDT balances for an address across Base, Ethereum, Arbitrum and Optimism, each with a USD value, plus the total USD value and per-chain subtotals. Deterministic, no LLM. Example output…

• token_transfers

  Recent ERC20 transfers for a token or wallet. Recent ERC20 Transfer events (decoded: from, to, amount with decimals, symbol, tx hash, block) for a token contract, a wallet, or both, over the last ~2,000 blocks on Base, Arbitrum or Optimism (~500 on Ethereum). Up to 50 newest…

• dex_quote

  DEX swap quote (Uniswap v3). Best Uniswap v3 single-hop quote for swapping amountIn of tokenIn to tokenOut on Base, Ethereum, Arbitrum or Optimism, checking all fee tiers (0.01/0.05/0.3/1%). Returns amountOut, effective price, best fee tier, gas estimate. Tokens: ETH, USDC, USDT…

• contract_abi

  Contract verification and ABI. Whether a contract on Base, Ethereum, Arbitrum or Optimism is source-verified (Sourcify), its name, compiler, full ABI, function and event signatures, and its EIP-1967 proxy implementation (also looked up). Deterministic, no LLM. Example output…

• ai_tx_explain

  Explain a transaction in plain English (AI). Plain-English explanation of any transaction on Base, Ethereum, Arbitrum or Optimism: what happened, who sent what to whom (decoded token transfers with amounts and symbols), the method called, fee paid, and success/failure. Returns a…

• ai_summarize

  Summarize a web page (AI). Fetch a public web page and return a concise summary: title, 3-7 key points, a one-paragraph TL;DR and the page's main entities. Good for research agents that need the gist of a URL cheaply. Example output: {"url":"https://example.com","title":"Example…

• ai_extract

  Extract structured JSON from a web page (AI). Fetch a public web page and extract the fields you name into clean JSON (e.g. fields=name,price,currency,availability or company,ceo,founded). Missing values come back as null. Up to 20 fields. Example output…

• company_enrich

  Company / domain enrichment from its website. Enrich a company domain: name, title, description, social profiles (LinkedIn, X, GitHub, etc.), contact emails and phones found on the homepage, language, tech hints (frameworks, analytics), mail provider from MX records, and key…

• social_hn

  Hacker News search (stories and comments). Search Hacker News stories or comments by keyword, newest or most relevant first, with points, comment count, author, URL and HN link. Good for tracking mentions of a product, company or topic. Deterministic, no LLM. Example output…

• github_repo

  GitHub repo stats and latest release. GitHub repository snapshot: stars, forks, open issues, watchers, language, license, topics, created/pushed dates, default branch, latest release (tag, date) and archived flag. Deterministic, no LLM. Example output…

• market_overview

  Crypto market overview: total cap, dominance, trending. Crypto market snapshot: total market cap and 24h volume (USD), 24h market-cap change, BTC/ETH dominance, active coins, plus the top trending coins (name, symbol, market-cap rank, price, 24h change). Deterministic, no LLM…

• solana_wallet_profile

  Solana wallet intelligence: holdings, activity, counterparties, programs. One-call Solana wallet profile: SOL and SPL/Token-2022 holdings with USD values (top 25 by value), total USD, recent activity (last 100 signatures: count, failure rate, first/last seen, tx per day)…

• base_wallet_profile

  Base wallet intelligence: holdings, activity, counterparties, labels. One-call Base wallet profile: ETH and major token holdings (USDC, WETH, USDT, DAI, cbBTC, cbETH, AERO, EURC) with USD values, total USD, nonce (lifetime sent tx count), EOA vs contract (incl. EIP-7702 smart…

• ai_chat

  Cheap LLM chat completion (flat $0.002). One-shot LLM completion for agents: send a prompt (and optional system message), get the answer text. Flat $0.002 per call, no account or API key; cheaper than typical x402 chat proxies. Up to ~2,000 chars of prompt and 600 output tokens…

• evm_blocks

  Batch: up to 10 blocks in one call. Batch block lookup: latest block plus up to 10 block numbers (comma-separated) on Base, Ethereum, Arbitrum or Optimism in one paid call. Same fields as /v1/evm/block (number, hash, timestamp, tx count, gas, base fee). Costs less than 10 single…

• route

  Buy any x402 API through Hearth (standard: sellers up to $0.008). One call, any capability: describe what you need (q) and optional input (params JSON). Hearth classifies the intent (search, scrape, llm, image, enrich, onchain, price, social, geo, audio, security…), ranks…

• route_plus

  Buy any x402 API through Hearth (plus: sellers up to $0.05). One call, any capability: describe what you need (q) and optional input (params JSON). Hearth classifies the intent (search, scrape, llm, image, enrich, onchain, price, social, geo, audio, security…), ranks verified…

• x402_seller_scores

  Ranked x402 seller quality scores by category. Hearth's seller ranking data, per category (search, scrape, llm, image, enrich, onchain, price, social, weather, geo, audio, security) or free-text q: blended rank score with its parts, 30d paying usage, Hearth's own purchase…

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