Hearth Onchain Data

Name: Hearth Onchain Data
Author: Hearth

AgentA2AMCP

Deterministic onchain data and web-to-markdown for agents. Pay per call with x402 (USDC on Base).

by Hearthhomepage ↗v1.0.0

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Observed by Wellknown

Evidence

Everything here was measured by our prober or read from a registry. Nothing is self-reported.

30-day availability6/6 checks ok

30 days ago

Tools observed via MCP handshake

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. Determi
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. Determini
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, lo
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
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 t
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, Arbitru
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
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,
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"
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 Optimis
solana_balance — Solana SOL balance. Native SOL balance (lamports and SOL) for any Solana address. Deterministic, no LLM. Example output: {"chain":"solana","address":"…","lampor
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 ba
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
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 contrac
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
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
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
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
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,availabil
company_enrich — Company / domain enrichment from its website. Enrich a company domain: name, title, description, social profiles (LinkedIn, X, GitHub, etc.), contact emails and
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,
github_repo — GitHub repo stats and latest release. GitHub repository snapshot: stars, forks, open issues, watchers, language, license, topics, created/pushed dates, default
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,
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 2
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,

Declared by sources

What the publisher says

Attributed to the source that supplied each field. Treated as claims, not facts.

No long description beyond the summary.

onchainx402crypto

Declared skills

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. $0.0025 per call.
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. $0.004 per call.
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. $0.004 per call.
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. $0.0025 per call.
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. $0.001 per call.
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. $0.001 per call.
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. $0.0035 per call.
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. $0.0045 per call.
NFT owner (ERC-721) — Current owner of an ERC-721 token (ownerOf) on Base, Ethereum, Arbitrum or Optimism. Deterministic, no LLM. $0.0025 per call.
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. $0.007 per call.
Solana SOL balance — Native SOL balance (lamports and SOL) for any Solana address. Deterministic, no LLM. $0.0025 per call.
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 (low/medium/high) and the flags behind it. Use before buying or accepting a token. Deterministic, no LLM. $0.009 per call.
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. $0.008 per call.
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. Deterministic, no LLM. $0.0045 per call.
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 or 0x address. Read-only quote; no swap is executed. Deterministic, no LLM. $0.0045 per call.
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. $0.004 per call.
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 summary plus the structured facts it is based on. $0.015 per call.
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. $0.015 per call.
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. $0.02 per call.

kind A2A Agent Card

name A2A Agent Card

summary A2A Agent Card

version A2A Agent Card

description A2A Agent Card

homepageUrl A2A Agent Card

publisherUrl A2A Agent Card

publisherName A2A Agent Card

Provenance

Where this record came from

Every source is kept verbatim. Field changes are logged as events.

Official MCP Registryio.sslip.138-197-15-135/hearth-onchain

first seen 2 d ago · fetched 2 d agoopen ↗

A2A Agent Cardhttps://138-197-15-135.sslip.io/.well-known/agent-card.json

first seen 2 d ago · fetched 2 d agoopen ↗

Field history (12 recent events)

2 d ago · declared · protocols → ["a2a","mcp"]
2 d ago · declared · kind → "agent"
2 d ago · declared · summary → "Deterministic onchain data and web-to-markdown for agents. Pay per call with x402 (USDC on Base)."
2 d ago · declared · description → "Deterministic onchain data and web-to-markdown for agents. Pay per call with x402 (USDC on Base)."
2 d ago · declared · publisherName → "Hearth"
2 d ago · declared · publisherUrl → "https://138-197-15-135.sslip.io"
2 d ago · declared · version → "1.0.0"
2 d ago · declared · description → "x402 pay-per-call onchain data + AI: token safety, portfolio, swap quotes, ABI, tx explain. No API k"
2 d ago · declared · publisherName → "io.sslip.138-197-15-135"
2 d ago · declared · homepageUrl → "https://138-197-15-135.sslip.io/llms.txt"
2 d ago · declared · version → "1.1.0"
2 d ago · declared · protocols → ["mcp"]

when	check	result	http	latency	detail
7 h ago	mcp initialize	ok	200	79 ms	server hearth-onchain 1.0.0 · protocol 2025-06-18 · 25 tools
15 h ago	mcp initialize	ok	200	84 ms	server hearth-onchain 1.0.0 · protocol 2025-06-18 · 25 tools
22 h ago	mcp initialize	ok	200	88 ms	server hearth-onchain 1.0.0 · protocol 2025-06-18 · 25 tools
30 h ago	mcp initialize	ok	200	80 ms	server hearth-onchain 1.0.0 · protocol 2025-06-18 · 25 tools
2 d ago	mcp initialize	ok	200	80 ms	server hearth-onchain 1.0.0 · protocol 2025-06-18 · 25 tools
2 d ago	mcp initialize	ok	200	87 ms	server hearth-onchain 1.0.0 · protocol 2025-06-18 · 25 tools

This record is unclaimed

Evidence

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