Hearth Markdown

Endpoints (31 live)

• GET /v1/markdown — Fetch any public web page and get clean Markdown (title, headings, links, text). Deterministic, no LLM, fast. GET ?url=https://... (0.0085 USDC on Base)
• GET /v1/token/transfers — 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 USDC on Base)
• GET /v1/contract/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 USDC on Base)
• GET /v1/dex/quote — 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 USDC on Base)
• GET /v1/token/safety — 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 USDC on Base)
• GET /v1/base/wallet — Native ETH balance, nonce (tx count) and whether the address is a contract, on Base, Ethereum, Arbitrum or Optimism. Deterministic, no LLM. (0.0025 USDC on Base)
• GET /v1/base/token-info — Name, symbol, decimals, total supply and bytecode presence for a token contract on Base, Ethereum, Arbitrum or Optimism. Deterministic, no LLM. (0.004 USDC on Base)
• GET /v1/base/erc20-balance — ERC20 balance of any wallet on Base, Ethereum, Arbitrum or Optimism (USDC by default) via balanceOf, with decimals applied. Deterministic, no LLM. (0.0025 USDC on Base)
• GET /v1/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 USDC on Base)
• GET /v1/wallet/portfolio — 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 USDC on Base)
• GET /v1/solana/balance — Native SOL balance (lamports and SOL) for any Solana address. Deterministic, no LLM. (0.0025 USDC on Base)
• GET /v1/base/tx-status — 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 USDC on Base)
• GET /v1/nft/owner — Current owner of an ERC-721 token (ownerOf) on Base, Ethereum, Arbitrum or Optimism. Deterministic, no LLM. (0.0025 USDC on Base)
• GET /v1/name/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 USDC on Base)
• GET /v1/token/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 USDC on Base)
• GET /v1/github/repo — 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. (0.003 USDC on Base)
• GET /v1/ai/summarize — 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 USDC on Base)
• GET /v1/market/overview — 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. (0.004 USDC on Base)
• GET /v1/base/wallet-profile — 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 account), recent ERC20 transfers in/out over ~5,000 blocks (~3h) with net flow, top counterparties labeled where known (Uniswap, Aerodrome, 1inch, 0x, Aave, Seaport, bridges), and a simple wallet type. Free public data, deterministic, no LLM. (0.012 USDC on Base)
• GET /v1/solana/wallet-profile — 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), programs used with labels (Jupiter, Raydium, Orca, Pump.fun, Meteora, Drift...), top counterparties from the last 15 transactions, and a simple wallet type (bot-like / trader / holder / inactive). Free public data, deterministic, no LLM. Cheaper than comparable Solana wallet-intel APIs. (0.012 USDC on Base)

+11 more endpoints.