saylorinnovations.com
Base, Arbitrum, Polygon · payout 0xa2a8df0f7caabea4e120a2568118f141569fc8aa
Answers HTTP 402
9 of 9 probed endpoints answered HTTP 402 with a parseable payment payload
checked 2026-10-05
Method: one unpaid request per listed endpoint. A 402 with a payment payload a client could parse counts. Nothing is paid.
x402-style payments, last 7 days (Base)
58 x402-style payments from 8 distinct payers, $0.13 USDC in the last 7 days (Base, exact read)
window ended 2026-10-05
- Payments
- 58
- Outside payers
- 8
- USDC
- 0.13
All USDC received at this payout address: $0.13 (includes payments that are not x402)
Method: counted when the transaction carries a signed USDC authorization (EIP-3009), the settlement x402's exact scheme uses. Some non-x402 gasless sends use it too.
Reading: x402-style payments to this payout address on Base, exact read of the 7 days to 2026-10-05, every block of the window: counted when the transaction carries a signed USDC authorization (EIP-3009), the settlement x402's `exact` scheme uses. Some non-x402 gasless sends use it too; Sato Hub's own payer wallets are left out
Delivery is not measured. We never send a payment, so we never observe what a paid call returns. Unknown means we hold no reading, not that anything failed.
Chains · one payout address, each chain read on its own
| Chain | Payout address | Listings | Answers 402 | x402-style payments |
|---|---|---|---|---|
| Base | 0xa2a8df0f7caabea4e120a2568118f141569fc8aa | 162 | 3 of 3 probed endpoints answered HTTP 402 with a parseable payment payload 2026-10-05 | 58 x402-style payments from 8 distinct payers, $0.13 USDC in the last 7 days (Base, exact read) |
| Arbitrum | 0xa2a8df0f7caabea4e120a2568118f141569fc8aa | 162 | 3 of 3 probed endpoints answered HTTP 402 with a parseable payment payload 2026-10-05 | unknown. not measured on this chain yet |
| Polygon | 0xa2a8df0f7caabea4e120a2568118f141569fc8aa | 162 | 3 of 3 probed endpoints answered HTTP 402 with a parseable payment payload 2026-10-05 | unknown. not measured on this chain yet |
- Hosts
- saylorinnovations.com
- Listings
- 486 registered in the x402 catalogue
- Price range
- $0.0010 to $0.010 per call, as registered
- Categories (auto)
- Onchain data (204), Other (129), Developer tools (57), Market data (33), Identity (21), Security (12), Commerce (9), Media (6), Web data (6), Agents (3), Inference (3), Search (3)
- First seen
- 2026-10-05 · last seen 2026-10-05
Claim this merchant
Sign a message from the payout address 0xa2a8df…9fc8aa to claim this page or download its payment ledger. Claiming proves control of the payout key. It says nothing about the service behind the address, and it does not change how this merchant is ranked. No email, no account: the signature is the whole credential, and signing a message costs no gas and moves nothing.
Registrations · 486
| Endpoint | Chain | Category | Price | Catalogue date |
|---|---|---|---|---|
https://saylorinnovations.com/api/books/isbn/:isbn ISBN 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. | Base | Developer tools | $0.001 | 2026-09-25 |
https://saylorinnovations.com/api/chess/player/:username Chess 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. | Base | Other | $0.001 | 2026-09-25 |
https://saylorinnovations.com/api/country/:country Country 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 Worl… | Base | Other | $0.001 | 2026-09-25 |
https://saylorinnovations.com/api/elements/:element Periodic 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 b… | Base | Other | $0.001 | 2026-09-25 |
https://saylorinnovations.com/api/evm/arbitrum/nonce/:address EVM Nonce (arbitrum). Arbitrum account nonce: confirmed and pending transaction count for any address. | Base | Onchain data | $0.001 | 2026-09-25 |
https://saylorinnovations.com/api/evm/base/nonce/:address EVM 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. | Base | Onchain data | $0.001 | 2026-09-25 |
https://saylorinnovations.com/api/evm/bsc/nonce/:address EVM 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 o… | Base | Onchain data | $0.001 | 2026-09-25 |
https://saylorinnovations.com/api/evm/ethereum/nonce/:address EVM Nonce (ethereum). Ethereum account nonce: confirmed and pending transaction count for any address. | Base | Onchain data | $0.001 | 2026-09-25 |
https://saylorinnovations.com/api/evm/optimism/nonce/:address EVM Nonce (optimism). Optimism account nonce: confirmed and pending transaction count for any address. | Base | Onchain data | $0.001 | 2026-09-25 |
https://saylorinnovations.com/api/evm/polygon/nonce/:address 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 o… | Base | Onchain data | $0.001 | 2026-09-25 |
https://saylorinnovations.com/api/games/deals PC Game Deals Across Stores (Steam, GOG, Epic...) — Games | Base | Commerce | $0.001 | 2026-10-05 |
https://saylorinnovations.com/api/genetics/gene/:symbol Gene Reference: function and related conditions (MedlinePlus Genetics). Gene reference from MedlinePlus Genetics (NLM): full name, normal function and related health conditions. | Base | Other | $0.001 | 2026-09-25 |
https://saylorinnovations.com/api/hcpcs/:code 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 / termin… | Base | Other | $0.001 | 2026-09-25 |
https://saylorinnovations.com/api/perps/market/:coin Hyperliquid 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 Binan… | Base | Market data | $0.001 | 2026-09-25 |
https://saylorinnovations.com/api/price/:mint Token Price & Liquidity. Solana token price in USD plus liquidity for any SPL mint, from two independent sources (DexScreener and Jupiter) with the spread between them reported — a wide spread is itself a warning signal… | Base | Market data | $0.001 | 2026-09-25 |
https://saylorinnovations.com/api/token-price/base/:address Token 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, t… | Base | Market data | $0.001 | 2026-09-25 |
https://saylorinnovations.com/api/token-price/bsc/:address Token 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, t… | Base | Market data | $0.001 | 2026-09-25 |
https://saylorinnovations.com/api/token-price/ethereum/:address Token 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, t… | Base | Market data | $0.001 | 2026-09-25 |
https://saylorinnovations.com/api/token-price/solana/:solana_address Token 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, t… | Base | Market data | $0.001 | 2026-09-25 |
https://saylorinnovations.com/api/words/define/:word Dictionary: 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… | Base | Other | $0.001 | 2026-09-25 |
https://saylorinnovations.com/api/aircraft/military Military Aircraft Airborne Now (worldwide ADS-B) — Aviation | Base | Other | $0.002 | 2026-10-05 |
https://saylorinnovations.com/api/aircraft/track/:id Track a Flight or Aircraft (callsign, hex or registration) — Aviation | Base | Commerce | $0.002 | 2026-10-05 |
https://saylorinnovations.com/api/bio/alphafold/:id AlphaFold 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 interpre… | Base | Other | $0.002 | 2026-09-25 |
https://saylorinnovations.com/api/bio/pathways/:id Biological 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 d… | Base | Other | $0.002 | 2026-09-25 |
https://saylorinnovations.com/api/bio/pdb/:pdb_id Protein 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, boun… | Base | Other | $0.002 | 2026-09-25 |
https://saylorinnovations.com/api/evm/arbitrum/allowance/:address/:address2/:address3 ERC-20 Allowance (arbitrum). Arbitrum ERC-20 allowance: how much a spender may move from an owner, human-readable, with an unlimited-approval flag. | Base | Onchain data | $0.002 | 2026-09-25 |
https://saylorinnovations.com/api/evm/arbitrum/storage/:address/0 Contract Storage Slot (arbitrum). Arbitrum contract storage slot read: raw 32-byte value plus uint and address decodings. | Base | Developer tools | $0.002 | 2026-09-25 |
https://saylorinnovations.com/api/evm/arbitrum/tx/:hash EVM 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. | Base | Onchain data | $0.002 | 2026-09-25 |
https://saylorinnovations.com/api/evm/base/allowance/:address/:address2/:address3 ERC-20 Allowance (base). Base ERC-20 allowance: how much a spender may move from an owner, human-readable, with an unlimited-approval flag. | Base | Onchain data | $0.002 | 2026-09-25 |
https://saylorinnovations.com/api/evm/base/storage/:address/0 Contract Storage Slot (base). Base contract storage slot read: raw 32-byte value plus uint and address decodings. | Base | Developer tools | $0.002 | 2026-09-25 |
https://saylorinnovations.com/api/evm/base/tx/:hash EVM 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. | Base | Onchain data | $0.002 | 2026-09-25 |
https://saylorinnovations.com/api/evm/bsc/allowance/:address/:address2/:address3 ERC-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 … | Base | Onchain data | $0.002 | 2026-09-25 |
https://saylorinnovations.com/api/evm/bsc/storage/:address/0 Contract 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 st… | Base | Onchain data | $0.002 | 2026-09-25 |
https://saylorinnovations.com/api/evm/bsc/tx/:hash EVM Transaction Details (bsc). BNB Chain transaction details: status, from/to, value, block, gas used, fee, event count, method selector. | Base | Onchain data | $0.002 | 2026-09-25 |
https://saylorinnovations.com/api/evm/ethereum/allowance/:address/:address2/:address3 ERC-20 Allowance (ethereum). Ethereum ERC-20 allowance: how much a spender may move from an owner, human-readable, with an unlimited-approval flag. | Base | Onchain data | $0.002 | 2026-09-25 |
https://saylorinnovations.com/api/evm/ethereum/block/latest EVM Block (ethereum) — On-Chain Data | Base | Onchain data | $0.002 | 2026-10-05 |
https://saylorinnovations.com/api/evm/ethereum/erc1155-balance/:address/:address2/1 ERC-1155 Balance (ethereum). ERC-1155 balance: how many copies of a token id a wallet holds. Any of 5 chains. | Base | Onchain data | $0.002 | 2026-09-25 |
https://saylorinnovations.com/api/evm/ethereum/nft-owner/:address/1 NFT Owner (ERC-721) (ethereum). NFT owner (ERC-721 ownerOf) for any collection on Base, Ethereum, Arbitrum, Optimism or Polygon. | Base | Onchain data | $0.002 | 2026-09-25 |
https://saylorinnovations.com/api/evm/ethereum/storage/:address/0 Contract Storage Slot (ethereum). Ethereum contract storage slot read: raw 32-byte value plus uint and address decodings. | Base | Developer tools | $0.002 | 2026-09-25 |
https://saylorinnovations.com/api/evm/ethereum/tx/:hash EVM Transaction Details (ethereum). Ethereum transaction details: status, from/to, value, block, nonce, gas used, total fee, event count and method selector. | Base | Onchain data | $0.002 | 2026-09-25 |
https://saylorinnovations.com/api/evm/optimism/allowance/:address/:address2/:address3 ERC-20 Allowance (optimism). Optimism ERC-20 allowance: how much a spender may move from an owner, human-readable, with an unlimited-approval flag. | Base | Onchain data | $0.002 | 2026-09-25 |
https://saylorinnovations.com/api/evm/optimism/storage/:address/0 Contract Storage Slot (optimism). Optimism contract storage slot read: raw 32-byte value plus uint and address decodings. | Base | Developer tools | $0.002 | 2026-09-25 |
https://saylorinnovations.com/api/evm/optimism/tx/:hash 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. | Base | Onchain data | $0.002 | 2026-09-25 |
https://saylorinnovations.com/api/evm/polygon/allowance/:address/:address2/:address3 ERC-20 Allowance (polygon). Polygon ERC-20 allowance: how much a spender may move from an owner, human-readable, with an unlimited-approval flag. | Base | Onchain data | $0.002 | 2026-09-25 |
https://saylorinnovations.com/api/evm/polygon/storage/:address/0 Contract Storage Slot (polygon). Polygon contract storage slot read: raw 32-byte value plus uint and address decodings. | Base | Developer tools | $0.002 | 2026-09-25 |
https://saylorinnovations.com/api/evm/polygon/tx/:hash 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. | Base | Onchain data | $0.002 | 2026-09-25 |
https://saylorinnovations.com/api/ip/:address 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, regist… | Base | Identity | $0.002 | 2026-09-25 |
https://saylorinnovations.com/api/papers/paper Paper Lookup by DOI, arXiv ID or PMID (with abstract) — Research | Base | Other | $0.002 | 2026-10-05 |
https://saylorinnovations.com/api/predictions/kalshi/KXPRESNOMD-28 Prediction Market Event Detail — Prediction Markets | Base | Market data | $0.002 | 2026-10-05 |
https://saylorinnovations.com/api/sanctions/address/:address OFAC 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, … | Base | Security | $0.002 | 2026-09-25 |
Descriptions are the seller’s own words from the catalogue and are not checked by us. A listed price is a registration, not an observed charge.
Data CC-BY-4.0, attribution: data by satohub.ai. Collector run 2026-10-05. Appearing here is not an endorsement. Check an endpoint with the doctor.