x402watch

37,707 paid endpoints are listed. 23,020 answered a real 402 at the last check.

Every x402 endpoint on the Coinbase Bazaar and x402scan, probed unpaid every six hours. A listing tells you the price a seller wrote down. This tells you whether the endpoint is reachable, whether it charges what it declared, and how fast it answers. Ranked by an assay score out of 100.

Last check 2026-09-30 05:46 UTC · 37,707 probed

23,020 answering 4029,132 down4,532 rejecting1,023 no paywall2,818 price drift
  1. 22saylorinnovations.com/api/ip/:addressIP 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.$0.002 Solanarejecting1 payers0% up
  2. 22saylorinnovations.com/api/token-price/bsc/:addressToken Price by Contract (any chain). Token price by contract address on any chain (Ethereum, Base, Arbitrum, Optimism, Polygon, BNB, Solana, Avalanche, Sui, TON, Tron and more): USD and native price, 1h/6h/24h change, total liquidity and 24h volume across pairs, FDV, market cap, best pair and a thin-liquidity flag.$0.001 Solanarejecting1 payers0% up
  3. 22saylorinnovations.com/api/token-price/solana/:solana_addressToken Price by Contract (any chain). Token price by contract address on any chain (Ethereum, Base, Arbitrum, Optimism, Polygon, BNB, Solana, Avalanche, Sui, TON, Tron and more): USD and native price, 1h/6h/24h change, total liquidity and 24h volume across pairs, FDV, market cap, best pair and a thin-liquidity flag.$0.001 Solanarejecting1 payers0% up
  4. 22saylorinnovations.com/api/token-price/base/:addressToken Price by Contract (any chain). Token price by contract address on any chain (Ethereum, Base, Arbitrum, Optimism, Polygon, BNB, Solana, Avalanche, Sui, TON, Tron and more): USD and native price, 1h/6h/24h change, total liquidity and 24h volume across pairs, FDV, market cap, best pair and a thin-liquidity flag.$0.001 Solanarejecting1 payers0% up
  5. 22saylorinnovations.com/api/token-price/ethereum/:addressToken Price by Contract (any chain). Token price by contract address on any chain (Ethereum, Base, Arbitrum, Optimism, Polygon, BNB, Solana, Avalanche, Sui, TON, Tron and more): USD and native price, 1h/6h/24h change, total liquidity and 24h volume across pairs, FDV, market cap, best pair and a thin-liquidity flag.$0.001 Solanarejecting1 payers0% up
  6. 22saylorinnovations.com/api/stocks/fundamentals/:symbolCompany Fundamentals (SEC filings) — NVDA. Company fundamentals from official SEC 10-K filings: last 4 fiscal years of revenue, net income, operating income, diluted EPS, operating cash flow, total assets, liabilities, equity, cash and long-term debt, plus net margin, revenue growth and leverage. Tags merged across years so figures stay current.$0.003 Solanarejecting1 payers0% up
  7. 22saylorinnovations.com/api/stocks/quote/:symbolStock Quote — AAPL. Stock quote for any ticker (US stocks, ETFs, indices): price, change and % change, day and 52-week range, volume, exchange and market time. Yahoo Finance with Nasdaq fallback; unknown tickers are free 404s.$0.002 Solanarejecting1 payers0% up
  8. 22saylorinnovations.com/api/chess/player/:usernameChess Player Ratings & Stats (Lichess). Lichess chess player profile: title, ratings and game counts per time control, win/loss/draw totals, country, join date and play time.$0.001 Solanarejecting1 payers0% up
  9. 22saylorinnovations.com/api/country/:countryCountry Profile: facts + latest economic indicators. Country profile by name or ISO code: official and native names, ISO codes, capital, region, borders, languages, currencies, calling codes, TLD, area, plus latest World Bank indicators: population, GDP, GDP per capita, inflation, unemployment, life expectancy, internet use, trade.$0.001 Solanarejecting1 payers0% up
  10. 22saylorinnovations.com/api/books/isbn/:isbnISBN Lookup: title, authors, publisher, description, cover. ISBN lookup (checksum-validated ISBN-10/13): title, authors, publisher, publish date, pages, languages, subjects, description, first published and cover image.$0.001 Solanarejecting1 payers0% up
  11. 22saylorinnovations.com/api/words/define/:wordDictionary: Definitions, Examples, Pronunciation. English dictionary: definitions by part of speech with usage examples (Wiktionary), pronunciation, syllable count and word frequency; spelling suggestions when a word is not found.$0.001 Solanarejecting1 payers0% up
  12. 22saylorinnovations.com/api/perps/market/:coinHyperliquid Perp Market. Hyperliquid perp market for any coin: mark and oracle price, 24h change and volume, open interest in coins and USD, premium, max leverage, and funding (hourly and annualized) compared with Binance and Bybit.$0.001 Solanarejecting1 payers0% up
  13. 22saylorinnovations.com/api/hcpcs/:codeHCPCS 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.$0.001 Solanarejecting1 payers0% up
  14. 22bcchildcare.getregisters.com/api/v1/records/:rid/purchaseBC Childcare Register: buy one current structured obligation record with original-source citations. Find a relevant ID first with free search at https://getregisters.com/api/v1/agent-search?feed_id=bc-childcare, then buy its agent_offer.url. Current full structured version at purchase; no history or future updates. Licence: https://getregisters.com/agent-licence.html$0.005 Baserejecting1 payers0% up
  15. 22macro-pulse-x402.onrender.com/macro-pulse/:country_codeComputed economic momentum score for a country (GDP growth, inflation, unemployment trend, synthesized into a single directional signal).$0.02 Baserejecting1 payers0% up
  16. 22dihh.my.id/price/:pairSingle-pair crypto lookup: price in USDC, composite signal score (-100..+100), ATR% and reasons. Path param is the Coinbase pair id, e.g. /price/BTC-USDC.$0.001 Baserejecting1 payers0% up
  17. 22intel.halowerk.com/v1/intel/watches/:idLöscht Watch und zugehörige Alarme nur beim verifizierten Eigentümer. Die verifizierte Zahleradresse ist der Eigentümer; Ergebnisse und gespeicherte Daten sind strikt auf diesen Zahler begrenzt.$0.001 Baserejecting1 payers0% up
  18. 22api.textus.dev/api/v1/resources/:id/content.jsonTextus: structured content with editable baseline direction, characters and scenes for audio, games and media production. One purchase returns one selected text unit as JSON; no audio or provider execution. Find IDs, metadata, prices and availability: https://api.textus.dev/api/v1/resources.json$0.49 Baserejecting1 payers0% up
  19. 22api.usenami.io/v1/funding/spread/:symbolCross-venue funding-rate spread for one crypto perpetual: the highest- and lowest-paying venues and the gap between them in bps. Where a funding-arb screen starts, across both CEX and DEX perp venues.$0.001 Baserejecting1 payers0% up
  20. 22api.usenami.io/v1/orderbook/:venue/:symbol/topTop-of-book for one crypto perpetual on one venue — best bid, best ask and the spread between them. Covers CEX and DEX perp venues: Binance, Bybit, OKX, Hyperliquid, Paradex, Drift and others.$0.001 Baserejecting1 payers0% up
  21. 22saylorinnovations.com/api/evm/bsc/storage/:address/0Contract Storage Slot (bsc). BNB Chain (BSC) raw contract storage slot read with the value also decoded as a uint256 and as an address. Use it to inspect proxy implementations, owners, paused flags and other on-chain state not exposed by a getter.$0.002 Solanarejecting1 payers0% up
  22. 22saylorinnovations.com/api/evm/bsc/events/:addressContract Event Logs (bsc). BNB Chain (BSC) contract event logs over a recent block window: block, transaction hash, log index, topics and data, optionally filtered by event signature (?topic0=). Use it to watch a contract for transfers, swaps or custom events.$0.005 Solanarejecting1 payers0% up
  23. 22saylorinnovations.com/api/evm/bsc/transfers/:addressToken Transfer History (bsc). BNB Chain token transfer history for a wallet (in/out labelled, decoded amounts).$0.005 Solanarejecting1 payers0% up
  24. 22saylorinnovations.com/api/evm/ethereum/erc1155-balance/:address/:address2/1ERC-1155 Balance (ethereum). ERC-1155 balance: how many copies of a token id a wallet holds. Any of 5 chains.$0.002 Solanarejecting1 payers0% up
  25. 22saylorinnovations.com/api/evm/ethereum/nft-metadata/:address/1NFT 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.$0.005 Solanarejecting1 payers0% up
  26. 22saylorinnovations.com/api/evm/ethereum/nft-owner/:address/1NFT Owner (ERC-721) (ethereum). NFT owner (ERC-721 ownerOf) for any collection on Base, Ethereum, Arbitrum, Optimism or Polygon.$0.002 Solanarejecting1 payers0% up
  27. 22saylorinnovations.com/api/evm/polygon/storage/:address/0Contract Storage Slot (polygon). Polygon contract storage slot read: raw 32-byte value plus uint and address decodings.$0.002 Solanarejecting1 payers0% up
  28. 22saylorinnovations.com/api/evm/polygon/transfers/:addressToken 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.$0.005 Solanarejecting1 payers0% up
  29. 22saylorinnovations.com/api/evm/optimism/storage/:address/0Contract Storage Slot (optimism). Optimism contract storage slot read: raw 32-byte value plus uint and address decodings.$0.002 Solanarejecting1 payers0% up
  30. 22saylorinnovations.com/api/evm/arbitrum/storage/:address/0Contract Storage Slot (arbitrum). Arbitrum contract storage slot read: raw 32-byte value plus uint and address decodings.$0.002 Solanarejecting1 payers0% up
  31. 22saylorinnovations.com/api/evm/ethereum/storage/:address/0Contract Storage Slot (ethereum). Ethereum contract storage slot read: raw 32-byte value plus uint and address decodings.$0.002 Solanarejecting1 payers0% up
  32. 22saylorinnovations.com/api/evm/base/storage/:address/0Contract Storage Slot (base). Base contract storage slot read: raw 32-byte value plus uint and address decodings.$0.002 Solanarejecting1 payers0% up
  33. 22saylorinnovations.com/api/evm/ethereum/tx/:hashEVM Transaction Details (ethereum). Ethereum transaction details: status, from/to, value, block, nonce, gas used, total fee, event count and method selector.$0.002 Solanarejecting1 payers0% up
  34. 22saylorinnovations.com/api/base/token/:addressBase Token Verdict. Base token verdict: send any Base (chain 8453) token contract address, get a plain-language verdict (avoid / high-risk / caution / looks-ok), a 0-100 score with every deduction explained, honeypot and buy/sell tax checks, owner privileges (hidden owner, mintable, blacklist, pausable, tax changeable), top-10 holder concentration, and live DEX liquidity, volume and pair age. Transparent rules, no black box. Free sample at /api/base/sample.$0.01 Solanarejecting1 payers0% up
  35. 22saylorinnovations.com/api/aircraft/track/:idTrack a Flight or Aircraft (callsign, hex or registration). Track any flight or aircraft by callsign, ICAO hex or registration: live position if airborne, aircraft type, manufacturer, owner and photo, plus the airline and scheduled origin/destination airports for the callsign.$0.002 Solanarejecting1 payers0% up
  36. 22saylorinnovations.com/api/genetics/gene/:symbolGene Reference: function and related conditions (MedlinePlus Genetics). Gene reference from MedlinePlus Genetics (NLM): full name, normal function and related health conditions.$0.001 Solanarejecting1 payers0% up
  37. 22saylorinnovations.com/api/elements/:elementPeriodic Table Element Data. Periodic table element data by symbol, name or atomic number: atomic mass, group, state, electron configuration, electronegativity, radius, ionization energy, oxidation states, melting and boiling points, density, discovery year.$0.001 Solanarejecting1 payers0% up
  38. 22saylorinnovations.com/api/evm/bsc/nonce/:addressEVM Nonce (bsc). BNB Chain (BSC) 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.$0.001 Solanarejecting1 payers0% up
  39. 22saylorinnovations.com/api/evm/bsc/tx/:hashEVM Transaction Details (bsc). BNB Chain transaction details: status, from/to, value, block, gas used, fee, event count, method selector.$0.002 Solanarejecting1 payers0% up
  40. 22saylorinnovations.com/api/evm/bsc/allowance/:address/:address2/:address3ERC-20 Allowance (bsc). BNB Chain (BSC) BEP-20 token allowance: how much a spender contract (router, bridge, DEX) may move from an owner wallet, in raw and decimal units, with an unlimited-approval risk flag. Use it to audit approvals before or after interacting with a contract.$0.002 Solanarejecting1 payers0% up
  41. 22saylorinnovations.com/api/evm/bsc/contract/:addressEVM Contract Introspection (bsc). BNB Chain contract introspection: contract vs wallet, bytecode size, proxy detection and BEP-20 name, symbol, decimals, total supply.$0.003 Solanarejecting1 payers0% up
  42. 22saylorinnovations.com/api/bnb/token/:addressBNB Chain Token Verdict. BNB Chain (BSC) token verdict and wallet-risk check: any BEP-20 token address gets avoid / high-risk / caution / looks-ok, a 0-100 score with every deduction explained, honeypot and buy/sell tax checks, owner privileges (hidden owner, mintable, blacklist, pausable, tax changeable), top-10 holder concentration and live PancakeSwap/DEX liquidity. Free sample at /api/bnb/sample.$0.01 Solanarejecting1 payers0% up
  43. 22saylorinnovations.com/api/web/domain/:domainDomain Intelligence — registration, age, DNS, availability, risk flags. Domain intelligence and availability check: registered or available, creation date and age in days, expiry, registrar, status locks, DNSSEC, nameservers, live DNS (A, AAAA, MX, SPF), first and last seen in the Internet Archive, and risk flags (very new domain, expiring soon, registry hold, no website). Useful for phishing and scam checks — the target site is never contacted.$0.002 Solanarejecting1 payers0% up
  44. 22saylorinnovations.com/api/defi/protocol/:slugDeFi Protocol TVL. DeFi protocol TVL: total value locked, 1-day and 7-day change, per-chain TVL with borrowed and staked amounts, category, market cap and audit count for any DefiLlama protocol slug.$0.003 Solanarejecting1 payers0% up
  45. 22saylorinnovations.com/api/evm/ethereum/nfts/:address/:address2NFTs 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.$0.005 Solanarejecting1 payers0% up
  46. 22saylorinnovations.com/api/evm/polygon/events/:addressContract 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.$0.005 Solanarejecting1 payers0% up
  47. 22saylorinnovations.com/api/evm/polygon/nonce/:addressEVM 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.$0.001 Solanarejecting1 payers0% up
  48. 22saylorinnovations.com/api/evm/polygon/tx/:hashEVM 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.$0.002 Solanarejecting1 payers0% up
  49. 22saylorinnovations.com/api/evm/polygon/allowance/:address/:address2/:address3ERC-20 Allowance (polygon). Polygon ERC-20 allowance: how much a spender may move from an owner, human-readable, with an unlimited-approval flag.$0.002 Solanarejecting1 payers0% up
  50. 22saylorinnovations.com/api/evm/polygon/contract/:addressEVM 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.$0.003 Solanarejecting1 payers0% up
  51. 22saylorinnovations.com/api/evm/optimism/events/:addressContract 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.$0.005 Solanarejecting1 payers0% up
  52. 22saylorinnovations.com/api/evm/optimism/transfers/:addressToken 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.$0.005 Solanarejecting1 payers0% up
  53. 22saylorinnovations.com/api/evm/optimism/nonce/:addressEVM Nonce (optimism). Optimism account nonce: confirmed and pending transaction count for any address.$0.001 Solanarejecting1 payers0% up
  54. 22saylorinnovations.com/api/evm/optimism/tx/:hashEVM 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.$0.002 Solanarejecting1 payers0% up
  55. 22saylorinnovations.com/api/evm/optimism/allowance/:address/:address2/:address3ERC-20 Allowance (optimism). Optimism ERC-20 allowance: how much a spender may move from an owner, human-readable, with an unlimited-approval flag.$0.002 Solanarejecting1 payers0% up
  56. 22saylorinnovations.com/api/evm/optimism/contract/:addressEVM 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.$0.003 Solanarejecting1 payers0% up
  57. 22saylorinnovations.com/api/evm/arbitrum/events/:addressContract Event Logs (arbitrum). Arbitrum contract event logs: raw logs for a contract, optional ?topic0= event filter, up to 2,000 blocks, newest first, up to 200 rows.$0.005 Solanarejecting1 payers0% up
  58. 22saylorinnovations.com/api/evm/arbitrum/transfers/:addressToken Transfer History (arbitrum). Arbitrum 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.$0.005 Solanarejecting1 payers0% up
  59. 22saylorinnovations.com/api/evm/arbitrum/nonce/:addressEVM Nonce (arbitrum). Arbitrum account nonce: confirmed and pending transaction count for any address.$0.001 Solanarejecting1 payers0% up
  60. 22saylorinnovations.com/api/evm/arbitrum/tx/:hashEVM Transaction Details (arbitrum). Arbitrum 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.$0.002 Solanarejecting1 payers0% up
  61. 22saylorinnovations.com/api/evm/arbitrum/allowance/:address/:address2/:address3ERC-20 Allowance (arbitrum). Arbitrum ERC-20 allowance: how much a spender may move from an owner, human-readable, with an unlimited-approval flag.$0.002 Solanarejecting1 payers0% up
  62. 22saylorinnovations.com/api/evm/arbitrum/contract/:addressEVM Contract Introspection (arbitrum). Arbitrum 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.$0.003 Solanarejecting1 payers0% up
  63. 22saylorinnovations.com/api/evm/ethereum/events/:addressContract Event Logs (ethereum). Ethereum contract event logs: raw logs for a contract, optional ?topic0= event filter, up to 2,000 blocks, newest first, up to 200 rows.$0.005 Solanarejecting1 payers0% up
  64. 22saylorinnovations.com/api/evm/ethereum/transfers/:addressToken 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.$0.005 Solanarejecting1 payers0% up
  65. 22saylorinnovations.com/api/evm/ethereum/nonce/:addressEVM Nonce (ethereum). Ethereum account nonce: confirmed and pending transaction count for any address.$0.001 Solanarejecting1 payers0% up
  66. 22saylorinnovations.com/api/evm/base/events/:addressContract Event Logs (base). Base contract event logs: raw logs for a contract, optional ?topic0= event filter, up to 2,000 blocks, newest first, up to 200 rows.$0.005 Solanarejecting1 payers0% up
  67. 22saylorinnovations.com/api/evm/base/transfers/:addressToken Transfer History (base). Base 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.$0.005 Solanarejecting1 payers0% up
  68. 22saylorinnovations.com/api/evm/base/nonce/:addressEVM Nonce (base). Base 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.$0.001 Solanarejecting1 payers0% up
  69. 22saylorinnovations.com/api/evm/base/tx/:hashEVM Transaction Details (base). Base transaction details: status, from/to, value, block, nonce, gas used, total fee including the L1 data fee, event count and method selector.$0.002 Solanarejecting1 payers0% up
  70. 22saylorinnovations.com/api/evm/ethereum/allowance/:address/:address2/:address3ERC-20 Allowance (ethereum). Ethereum ERC-20 allowance: how much a spender may move from an owner, human-readable, with an unlimited-approval flag.$0.002 Solanarejecting1 payers0% up
  71. 22saylorinnovations.com/api/evm/ethereum/contract/:addressEVM Contract Introspection (ethereum). Ethereum contract introspection: contract vs wallet (incl. EIP-7702 delegation), bytecode size, proxy detection (EIP-1967 implementation/admin/beacon and legacy OpenZeppelin slots) and ERC-20 name, symbol, decimals and total supply.$0.003 Solanarejecting1 payers0% up
  72. 22saylorinnovations.com/api/evm/base/allowance/:address/:address2/:address3ERC-20 Allowance (base). Base ERC-20 allowance: how much a spender may move from an owner, human-readable, with an unlimited-approval flag.$0.002 Solanarejecting1 payers0% up
  73. 22saylorinnovations.com/api/evm/base/contract/:addressEVM Contract Introspection (base). Base contract introspection: contract vs wallet (incl. EIP-7702 delegation), bytecode size, proxy detection (EIP-1967 implementation/admin/beacon and legacy OpenZeppelin slots) and ERC-20 name, symbol, decimals and total supply.$0.003 Solanarejecting1 payers0% up
  74. 22saylorinnovations.com/api/evm/bsc/balance/:addressEVM Wallet Balances (bsc). BNB Chain ERC-20 token balance and native BNB balance for any wallet: up to 20 ERC-20 tokens (?tokens=) in one call, with symbols, decimals and human-readable amounts. Live chain head.$0.003 Solanarejecting1 payers0% up
  75. 22saylorinnovations.com/api/evm/polygon/balance/:addressEVM 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.$0.003 Solanarejecting1 payers0% up
  76. 22saylorinnovations.com/api/evm/optimism/balance/:addressEVM 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.$0.003 Solanarejecting1 payers0% up
  77. 22saylorinnovations.com/api/evm/arbitrum/balance/:addressEVM Wallet Balances (arbitrum). Arbitrum 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.$0.003 Solanarejecting1 payers0% up
  78. 22saylorinnovations.com/api/evm/ethereum/balance/:addressEVM Wallet Balances (ethereum). Ethereum 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.$0.003 Solanarejecting1 payers0% up
  79. 22saylorinnovations.com/api/evm/base/balance/:addressEVM Wallet Balances (base). Base 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.$0.003 Solanarejecting1 payers0% up
  80. 22saylorinnovations.com/api/sanctions/address/:addressOFAC Sanctions Check — crypto address. OFAC sanctions wallet screening: check a crypto address against the U.S. Treasury SDN list before you send or accept funds — exact match across 18 currencies (ETH, XBT, SOL, USDT, USDC, TRX, BSC, ARB, XMR, LTC and more), EVM case-insensitive, with the sanctioned entity, program and list date.$0.002 Solanarejecting1 payers0% up
  81. 22saylorinnovations.com/api/bio/pathways/:idBiological Pathways for a Gene (Reactome). Biological pathways a gene or protein takes part in (Reactome), by gene symbol or UniProt accession: every pathway with its Reactome id, name, disease flag and link. Human by default, ?organism= taxon for others. Reactome, CC BY 4.0.$0.002 Solanarejecting1 payers0% up
  82. 22saylorinnovations.com/api/bio/alphafold/:idAlphaFold Predicted Protein Structure. AlphaFold predicted protein structure for a UniProt accession or gene symbol: model id and version, mean pLDDT confidence, fraction of residues per confidence band with an interpretation, and download links (PDB, mmCIF, predicted aligned error). AlphaFold DB (EMBL-EBI / Google DeepMind), CC BY 4.0.$0.002 Solanarejecting1 payers0% up
  83. 22saylorinnovations.com/api/bio/protein/:idProtein Function Lookup (UniProt). Protein function lookup by UniProt accession or gene symbol (TP53, BRCA1; human default, ?organism= taxon for others): recommended name, function, subcellular location, tissue specificity, associated diseases with OMIM ids, GO terms, keywords, EC numbers, PDB structures and AlphaFold model id. UniProtKB, CC BY 4.0.$0.003 Solanarejecting1 payers0% up
  84. 22saylorinnovations.com/api/bio/pdb/:pdb_idProtein Data Bank Structure (RCSB PDB). Protein Data Bank structure lookup by PDB id (4HHB): title, experimental method, resolution, release date, molecular weight, each polymer chain with organism and UniProt ids, bound ligands with formulas, primary citation (DOI, PubMed) and coordinate file links. RCSB PDB, CC0.$0.002 Solanarejecting1 payers0% up
  85. 22saylorinnovations.com/api/news/:coinCrypto Market Sentiment (Fear & Greed + news mood) — News & Sentiment$0.002 Solanarejecting1 payers0% up
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  87. 22phion.systems/v1/paid/trust/contact-enrichment-evidenceResolve a business contact from strong identifiers without presenting enrichment as identity proof.$0.007 Baserejecting1 payers0% up
  88. 22x402.professorsausages.com/fx-rates/rate/:base/:quoteOne EUR-triangulated cross-rate with inverse and auditable EUR legs, latest or any date back to 1999$0.002 Baserejecting1 payers0% up
  89. 22x402.professorsausages.com/nft/:chain/collection/searchCollection search by name — top ~10 matching contracts with links into every other endpoint; ALWAYS live$0.002 Baserejecting1 payers0% up
  90. 22x402.professorsausages.com/insider-trades/insider/:cikOne reporting owner's SEC Form 4 transactions across every issuer they file for — track serial founders, activists, and fund principals$0.01 Baserejecting1 payers0% up
  91. 22x402.professorsausages.com/nft/:chain/verify-ownershipRealtime holds-or-not ownership check (token-gating) — ALWAYS live$0.002 Baserejecting1 payers0% up
  92. 22x402.professorsausages.com/fx-rates/on/:dateFull rate snapshot on a historical fixing date back to 1999 — month-end revaluation staple; weekend dates substitute the prior fixing, flagged$0.003 Baserejecting1 payers0% up
  93. 22x402.professorsausages.com/insider-trades/company/:idOrTicker/summaryAggregate insider-flow analytics for one issuer — open-market buy vs sell net flow, non-open-market breakdown, cluster-buy detection, and a per-insider ledger$0.02 Baserejecting1 payers0% up
  94. 22x402.professorsausages.com/insider-trades/company/:idOrTickerAll SEC Form 4 insider transactions for one issuer (ticker or CIK), newest first, within a txn-date window$0.01 Baserejecting1 payers0% up
  95. 22x402.professorsausages.com/gas-oracle/:chain/historyBase-fee trajectory + congestion over up to 1024 blocks$0.003 Baserejecting1 payers0% up
  96. 22x402.professorsausages.com/gas-oracle/:chain/estimateUSD cost of a specific tx incl. OP-stack L1 data fee$0.002 Baserejecting1 payers0% up
  97. 22api.strale.io/x402/postal-code-lookupLook up location information from a postal/ZIP code. Returns city, region/state, and approximate coordinates. Covers 60+ countries via Zippopotam.us.$0.0216 Baserejecting1 payers0% up
  98. 22api.strale.io/x402/company-tech-stackDeep tech stack analysis of any domain. Analyzes HTTP headers, HTML source, JS libraries, DNS records, meta tags. Returns frontend, analytics, CDN, hosting, CMS, and more.$0.324 Baserejecting1 payers0% up
  99. 22api.strale.io/x402/company-id-detectIdentify the type and country of a company registration number. Detects Swedish org numbers, Finnish business IDs, German HRB numbers, LEIs, DUNS, and 20+ other formats. Pure algorithmic.$0.054 Baserejecting1 payers0% up
  100. 22api.strale.io/x402/secret-scanScan code/config/logs for leaked secrets: AWS keys, GitHub tokens, Stripe keys, API keys, private keys, DB URLs, JWTs. Algorithmic regex matching.$0.0216 Baserejecting1 payers0% up