eip155:137
3157 resources accept payment on this network.
Supported perpetual-futures trading pairs — the list of symbols (BTCUS
Supported perpetual-futures trading pairs — the list of symbols (BTCUSDT, ETHUSDT, …) the funding-rate scanner and signals cover, as a clean snake_case envelope.
What a USDC transfer actually costs on Base, Polygon, Arbitrum, Ethere
What a USDC transfer actually costs on Base, Polygon, Arbitrum, Ethereum and XDC, measured rather than assumed: gas units simulated per chain against live prices and fresh chain heads, plus the rollup L1 data fee where it applies. Every figure ships with its inputs and the block it was read at, so you can recompute it. Cheapest first; a chain that cannot be measured is excluded, never estimated.
Trace an HTTP redirect chain to its final destination without download
Trace an HTTP redirect chain to its final destination without downloading page bodies. Returns every hop (URL + status), the final URL, and safety warnings — link-safety grounding for agents before they visit or cite a URL. Clean JSON.
Spot Check
Spot Check. REQUIRES ?host= on the paid request — a signed request without it is refused before the gate and no money moves. Name a host and get what this observatory already holds on it, signed: corpus rounds and verdicts as recorded, when we last actually knocked, our coverage of the window since we met it, and the gaps with their reasons. Read from the books at the counter — no request is made to the host, so the answer is as fresh as our last round and no fresher, and sa…
Wikipedia article summary — plain-text and HTML extract, short descrip
Wikipedia article summary — plain-text and HTML extract, short description, thumbnail and Wikidata id for any title, in a clean normalized envelope with CC-BY-SA attribution.
Tariff rate lookup for trade and customs agents
Tariff rate lookup for trade and customs agents. Returns tariff rates for an HS code between any two countries.
Execute a service published by an external agent on the DexL network,
Execute a service published by an external agent on the DexL network, paid per call with x402
Second Opinion quick: an independent reasoning-only check (no web rese
Second Opinion quick: an independent reasoning-only check (no web research) of your claim's logic and consistency with established knowledge. Honest 'inconclusive' when the claim needs live research.
Realised 30-day yields for 13 tokenized treasury funds: BUIDL, BENJI,
Realised 30-day yields for 13 tokenized treasury funds: BUIDL, BENJI, OUSG, USDY, USTB, USYC, VBILL, mTBILL, TBILL, cUSDO, EUTBL, USTBL and UKTBL. Measured rows use NAV, price or verified passive-holder balance series under the published Open Treasury Yield Basis. Each carries its observations, sources and dates, plus an issuer figure and difference where available. Quoted and unavailable rows stay explicit; free coverage names every gap.
Hotel reviews — a hotel's guest reviews by property token: rating, dat
Hotel reviews — a hotel's guest reviews by property token: rating, date, text, per-aspect subratings, highlights & the owner's reply, with category filter & paging.
SSL/TLS certificate check: expiry, issuer, SANs, chain validity, hostn
SSL/TLS certificate check: expiry, issuer, SANs, chain validity, hostname match, negotiated protocol/cipher, and weak-algo warnings for a public HTTPS host. Clean JSON.
Holiday date check by country or subdivision — determine whether one I
Holiday date check by country or subdivision — determine whether one ISO date is an official public holiday.
Barker's historical APY trend for stablecoins vs
Barker's historical APY trend for stablecoins vs. US Treasury benchmark over a lookback window (7–180 days). Use for 'DeFi vs treasury', 'is stablecoin APY going up', 'crypto yield trend', '稳定币利率走势'.
Ethereum mainnet JSON-RPC from an independently operated full node
Ethereum mainnet JSON-RPC from an independently operated full node. One call per payment, no account or API key. Serves eth_, net_ and web3_ methods. Blocks, transactions, receipts and logs from the Merge (block 15537394) onward. Current state only, not an archive node: historical state calls are refused, not charged. eth_getLogs capped at 10000 blocks. Raw transactions go out via public relays. Price scales with method cost.
Calculate optimal per-call and subscription pricing for an API
Calculate optimal per-call and subscription pricing for an API
Get complete public information for an X community
Get complete public information for an X community.
Get a paginated timeline of posts from an X user
Get a paginated timeline of posts from an X user.
Current space-weather conditions — normalized NOAA SWPC Kp, solar wind
Current space-weather conditions — normalized NOAA SWPC Kp, solar wind, magnetic field, and X-ray flux used for solar-flare monitoring, with observation times and freshness.
A Hyperliquid account's spot token balances, for any 0x address
A Hyperliquid account's spot token balances, for any 0x address.
Google Maps local business search — find places by query and map locat
Google Maps local business search — find places by query and map location (coordinates viewport), returning ratings, reviews, address, phone, website, hours & service options as clean JSON.
The Hyperliquid perpetuals universe — tradeable symbols with max lever
The Hyperliquid perpetuals universe — tradeable symbols with max leverage and size decimals, without live context.
Current mid price for every Hyperliquid asset (perps + spot) in one ca
Current mid price for every Hyperliquid asset (perps + spot) in one call — a fast whole-venue price snapshot.