One Hacker News story (or comment) by id with up to 30 top-level comments: author, time, plain text up to 500 characters and reply count.

Hacker News stories: front-page lists (top, new, best, ask, show) or full-text search, each with title, URL, domain, points, comment count, author, time, HN link and text excerpt.

Same as POST /facts with query strings: values of one XBRL concept as filed (end, start, val, unit, fy, fp, form, filed, accn, frame), newest first, optional form and unit filters.

Scan up to 50 open-source packages (ecosystem, name, version) against OSV.dev: advisory ids, summary, severity, CVSS, fixed versions, CVE aliases with CISA KEV and EPSS joined, and a suggested minimum safe version.

Top 24h gainers and losers among Binance spot USDT pairs above a minimum 24h USD volume (default 10M), with price, change % and volume, plus market breadth.

Fetch historical Kalshi trade data

Structured research brief (exec summary, mechanisms, alternatives, risks, [n] citations) synthesized over live web search results plus any `urls` you supply - each supplied URL is fetched, content-scanned and cited as a numbered source. It is a $0.05 search-and-synthesize... | BlindOracle by Craig M. Brown (craigmbrown.com) - counterparty-risk infrastructure sold to autonomous AI agents; self-built multi-agent framework (42+ agents); ERC-8004 agent passport #60979; paid via x402 in USDC on Base

Full detail for a single vulnerability advisory by CVE / GHSA ID (e.g. 'ghsa:GHSA-xxxx') — severity, CVSS score, affected Composer/PHP package(s), and source link.

Median spot price of up to 50 coins across Binance, Coinbase, Kraken, OKX and Bybit in usd/usdt/eur/btc, with per-venue prices, 24h change %, summed 24h USD volume and cross-venue spread %. ids accepts CoinGecko ids or tickers.

x402-gateway tool: markdown (market: bazaar)

x402 debugging/troubleshooting Q&A: Ask any question, get a cited answer. Whether you need HTTP 402 Payment Required help, facilitator verify & settle (CDP @coinbase/cdp-sdk), Bazaar discovery metadata & listing, protocol documentation, Next.js paid routes, or planning, building, and integrating x402 servers: @x402/core @x402/next @x402/express @x402/hono @x402/fastify @x402/fetch @x402/axios @x402/mcp; Gin; FastAPI/Flask. Base & Solana USDC.

Returns a JSON object with current Bitcoin network fee estimates in satoshis per vByte

When to use: book reval on an IV surface under F/rate/time/vol shocks with sticky moneyness|strike|fixed_vol. Vol order: interpolate → volAbs → volRel → smileTwist*k. Greeks are sticky-σ BS Greeks (not smile bump deltas). USDC exact on Solana/Base. Prefer scalar /v1/portfolio/scenario for per-leg scalar σ books.

A token can look clean now — low tax, no honeypot, sells fine — and still leave the owner holding the switches to trap you later. sellability asks 'can I sell today'; this asks 'what can the owner do AFTER I buy'. Lists the mutable owner powers — raise sell tax to 100%, zero your balance, blacklist you, pause transfers, reclaim 'renounced' ownership, mint supply — each mapped to the attack it enables, plus whether a renounce is real. Not financial advice.

When to use: book of market premiums → need IV grid + per-quote Greeks (not a single contract). Shared rate/yield; each row has its own underlying (power/commodity forwards by maturity). Returns strike×maturity IV surface, fit quality, solve stats. USDC exact on Solana/Base. Prefer single IV endpoint for one premium.

Gaslessly fund your Polymarket deposit wallet: your signed USDC transfer settles directly to the Polymarket bridge (non-custodial); BlockRun pays the gas and charges $0.0110.

Current crypto Fear & Greed Index with 1-day change (alternative.me).

When to use: you already have an IV surface (k,T,σ) and need to price options on it — not invert premiums and not scalar σ. Interpolates total variance w=σ²T bilinear in log-moneyness k=ln(K/F); wingRule=flat_vol. Returns price, interpolated σ, k, F, BS Greeks. USDC exact on Solana/Base. Prefer /v1/option/price when σ is a single scalar.

When to use: multi-leg European book → need net MTM + net Greeks (long/short via signed quantity). Shared rate/yield; each leg has underlying, strike, T, type, quantity, vol. Optional dollar Greeks. Prefer scenario endpoint for what-if P&L. USDC exact on Solana/Base.

Pay-per-call: Hyperliquid Open Interest + Funding