EVM Network Status (ethereum) — On-Chain Data

NFT Metadata (ERC-721 / ERC-1155) (ethereum). NFT metadata for ERC-721 and ERC-1155: tokenURI resolved (IPFS, Arweave, data: URIs) and the JSON fetched and parsed, with a direct image URL. Any of 5 chains.

NFT Owner (ERC-721) (ethereum). NFT owner (ERC-721 ownerOf) for any collection on Base, Ethereum, Arbitrum, Optimism or Polygon.

NFTs Held in a Collection (ERC-721 Enumerable) (ethereum). NFTs a wallet holds in a collection (ERC-721 Enumerable): balance and up to 50 token ids. Any of 5 chains.

EVM Nonce (ethereum). Ethereum account nonce: confirmed and pending transaction count for any address.

Contract Storage Slot (ethereum). Ethereum contract storage slot read: raw 32-byte value plus uint and address decodings.

Token Transfer History (ethereum). Ethereum token transfer history: ERC-20 and ERC-721 Transfer events for a token, filtered to one wallet (?wallet=, in/out labelled, up to 2,000 blocks) or the latest 20 blocks unfiltered. Decoded amounts, up to 200 rows.

EVM Transaction Details (ethereum). Ethereum transaction details: status, from/to, value, block, nonce, gas used, total fee, event count and method selector.

Multi-Chain Gas Comparison — On-Chain Data

EVM Network Status (optimism) — On-Chain Data

ERC-20 Allowance (optimism). Optimism ERC-20 allowance: how much a spender may move from an owner, human-readable, with an unlimited-approval flag.

EVM Wallet Balances (optimism). Optimism ERC-20 token balance and native ETH balance for any wallet: up to 20 ERC-20 tokens (?tokens=) in one call, with symbols, decimals and human-readable amounts. Live chain head.

EVM Block (optimism) — On-Chain Data

Read-Only Contract Call (eth_call) (optimism). Optimism read-only contract call (eth_call) with ?data= calldata, optional ?from= and ?block=; reverts reported cleanly with revert data.

EVM Contract Introspection (optimism). Optimism contract introspection: contract vs wallet (incl. EIP-7702 delegation), bytecode size, proxy detection (EIP-1967 and legacy OpenZeppelin slots) and ERC-20 name, symbol, decimals, total supply.

Gas Estimate (optimism) — On-Chain Data

Contract Event Logs (optimism). Optimism contract event logs: raw logs for a contract, optional ?topic0= event filter, up to 2,000 blocks, newest first, up to 200 rows.

EVM Network Status (optimism) — On-Chain Data

EVM Nonce (optimism). Optimism account nonce: confirmed and pending transaction count for any address.

Contract Storage Slot (optimism). Optimism contract storage slot read: raw 32-byte value plus uint and address decodings.

Token Transfer History (optimism). Optimism token transfer history: ERC-20 and ERC-721 Transfer events for a token, filtered to one wallet (?wallet=, in/out labelled, up to 2,000 blocks) or the latest 20 blocks unfiltered. Decoded amounts, up to 200 rows.

EVM Transaction Details (optimism). Optimism transaction details: status, from/to, value, block, nonce, gas used, total fee (incl. L1 data fee on OP-stack chains), event count and method selector.

EVM Network Status (polygon) — On-Chain Data

ERC-20 Allowance (polygon). Polygon ERC-20 allowance: how much a spender may move from an owner, human-readable, with an unlimited-approval flag.

EVM Wallet Balances (polygon). Polygon ERC-20 token balance and native POL balance for any wallet: up to 20 ERC-20 tokens (?tokens=) in one call, with symbols, decimals and human-readable amounts. Live chain head.

EVM Block (polygon) — On-Chain Data

Read-Only Contract Call (eth_call) (polygon). Polygon read-only contract call (eth_call) with ?data= calldata, optional ?from= and ?block=; reverts reported cleanly with revert data.

EVM Contract Introspection (polygon). Polygon contract introspection: contract vs wallet (incl. EIP-7702 delegation), bytecode size, proxy detection (EIP-1967 and legacy OpenZeppelin slots) and ERC-20 name, symbol, decimals, total supply.

Gas Estimate (polygon) — On-Chain Data

Contract Event Logs (polygon). Polygon contract event logs: raw logs for a contract, optional ?topic0= event filter, up to 2,000 blocks, newest first, up to 200 rows.

EVM Network Status (polygon) — On-Chain Data

EVM Nonce (polygon). Polygon PoS account nonce for any address: confirmed nonce and pending nonce (a gap means transactions are still waiting in the mempool). Use it before sending a transaction or to detect a pending one.

Contract Storage Slot (polygon). Polygon contract storage slot read: raw 32-byte value plus uint and address decodings.

Token Transfer History (polygon). Polygon token transfer history: ERC-20 and ERC-721 Transfer events for a token, filtered to one wallet (?wallet=, in/out labelled, up to 2,000 blocks) or the latest 20 blocks unfiltered. Decoded amounts, up to 200 rows.

EVM Transaction Details (polygon). Polygon transaction details: status, from/to, value, block, nonce, gas used, total fee (incl. L1 data fee on OP-stack chains), event count and method selector.

PC Game Deals Across Stores (Steam, GOG, Epic...) — Games

Genetic Condition Reference (MedlinePlus Genetics) — Health & Medical

Gene Reference: function and related conditions (MedlinePlus Genetics). Gene reference from MedlinePlus Genetics (NLM): full name, normal function and related health conditions.

Grammar & Spelling Check (30+ languages) — Language

Tsunami Warnings & Bulletins (NOAA) — Natural Hazards

U.S. Volcano Alerts (elevated activity, USGS) — Natural Hazards

HCPCS Level II Code Lookup (CMS). HCPCS Level II medical billing code lookup (CMS), e.g. E0601 or J1100: short and long description, code category (DME, drugs, supplies, ambulance, orthotics), added / effective / terminated dates and obsolete flag. Public domain; CPT codes are AMA-licensed and not covered.

Price History (OHLCV). OHLCV price history (day/hour/minute candles) from the highest-liquidity pool for this mint. The only time-series endpoint here — every other route is a point-in-time snapshot.

Holder Breakdown. Check holder concentration for a Solana token: top 20 holders by balance with percent of supply, RugCheck's insider label per wallet, and the rolled-up top-10 share — spot whale, team and insider concentration before you buy.

IP Address Lookup (owner, country, range, abuse contact). IP address lookup from the regional internet registries (RDAP): network name and owner organization, country, address range and CIDR, abuse contact email, registration dates and reverse DNS. IPv4 and IPv6.

Accessibility Remediation Guide — Web & Domains

Agent Capability Registry and Discovery — AI & Agents

Agent Cost, Latency, and Quality Budgeting — AI & Agents

Agent Evaluation-Test Generator — AI & Agents

Agent Memory and State Integrity — AI & Agents