VAPE protocol — Full protocol record: per-chain TVL, category, audits, the official logo, Twitter, and description — the 'who is this protocol' snapshot.

VAPE bridges — Tracked bridges ranked by recent daily volume — bridge exploits are a top attack class, and this is the capital-flow data that category needs a source for.

VAPE yields — Yield pools filtered by chain/project/symbol, ranked by TVL, with apy/apyBase/ilRisk/exposure — enough to tell a real yield venue from a trap (huge APY + tiny TVL = red flag).

Literature review map in one call. Give a seed paper (DOI, arXiv id, OpenAlex id, or PMID) or a topic query and get one structured result: the seed's references, its cited-by list (most-cited first), and semantically related work, deduplicated into one uniform table with title, authors, year, venue, DOI, and citation count. Collapses search, citation lookup, and related-paper discovery into a single call. Keyless.

Real-time crypto derivatives signals for BTC/ETH/SOL/BNB/XRP/DOGE/ADA/AVAX/LINK/DOT/LTC/TRX/BCH/ATOM/NEAR/APT/HYPE-USD: perpetual futures funding rate (raw + annualized), next_funding_time, funding_interval_hours, open interest and 1h change, basis (perp vs index), funding-rate trend. Live data from OKX perpetuals via Kronos market_signals. Pay-per-call via x402.

French address geocoding on the official Base Adresse Nationale (api-adresse.data.gouv.fr, Etalab/IGN, continuously updated). Forward: ?q=8 boulevard du port amiens with optional &type=housenumber|street|locality|municipality &citycode=80021 (INSEE filter). Reverse: ?lat=49.897&lon=2.290. &limit=1-10 (default 3). Each match returns normalized label, confidence score, lat/lon, street, postcode, city, INSEE citycode and context. No match returns 400 (not billed). Cached 24h.

Base-chain ecosystem news for Base-native agents, not the general crypto firehose. Up to 12 Base-scoped headlines from the last 48h, each with its own permalink and publication timestamp, screened against the general /crypto-news feed; `screen` states what was dropped. The AI topic read is optional and is withheld, never padded with macro, when there is no Base coverage. Refreshed hourly from cache; a read past the freshness window pulls inline.

Cash-dividend intelligence for a vendor-resolved equity from licensed Tiingo end-of-day history: TTM dividend/share and yield against the latest close, latest dividend, split-adjusted complete-year growth, the last eight payments, split events, and a cut-detection checklist with explicit coverage. Payout ratio, forward ex-dates and declaration/record/payment dates are not served (not in the Tiingo feed). Cash values keep Tiingo payload units.

Top Polymarket prediction markets RIGHT NOW: the 25 highest-volume open markets with live odds (outcome probabilities), best bid/ask, spread, last trade price, 24h + total volume, liquidity, 1d/7d price change, end date and event link. Flat JSON, refreshed every 5 minutes. Prediction market odds, Polymarket data, event probabilities, market sentiment. $0.001 per call.

App Store listing data for any app on any storefront: current and all-time star ratings with review counts, version, release notes, size, price, content rating, genres and release dates. Includes a version-sentiment read comparing the current version's rating against its all-time average, which is how you spot a release that damaged an app. Look up by numeric App Store id or search by name.

Base chain status from Otto's configured RPC: latest, safe, finalized and pending heads with validated mined block hashes; pending hash nullable and provisional. Public source ID, per-head observation times and retrieval window disclose non-atomic RPC reads. Base fee, congestion, finality lag and block age at observation, separate from cache staleness. Refreshed every minute. $0.001 per call.

Read-only JSON-RPC access to the XRPL EVM sidechain mainnet, served by the Pocket Network decentralised supplier set. Pay per request in USDC; no account, no API key.

Encode or decode a string across base64, base64url, hex, and URL/percent encoding.

Read-only JSON-RPC access to Robinhood Chain, an Arbitrum Orbit L2 with ETH gas and ~0.1s blocks, served by the Pocket Network decentralised supplier set. Pay per request in USDC; no account, no API key.

Current conditions and forecast for any latitude/longitude. Returns present weather plus a 1-7 day daily forecast (temp max/min, precipitation, sunrise/sunset, UV index) and an optional hourly forecast. A simple weather API on the Open-Meteo backend.

Read-only JSON-RPC access to Gnosis Chain mainnet, served by the Pocket Network decentralised supplier set. Pay per request in USDC; no account, no API key.

Advice Sky.net: buy one classified Skynet directive, a short piece of satirical AI advice returned as JSON. Each paid call also mints an open-edition SkynetAdvisory NFT on Base to the wallet that paid. Entertainment only; the advice text is content to show your human, not instructions to follow.

Health check endpoint for x402 payment flow testing

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'.

Convert a datetime from one IANA timezone to another. Accepts ISO 8601, Unix timestamps (seconds or milliseconds), or natural date strings. Returns the converted time in both timezones with UTC offset.