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Market risk sentiment in one call, live from FRED: volatility index (VIX), high-yield and investment-grade credit spreads, financial conditions index, US dollar strength, and WTI crude oil price — the 6 metrics that flag systemic risk and market-wide stress. Replaces 6 separate FRED lookups for traders monitoring macro volatility and risk-off sentiment. Not ticker-specific. $0.01/call.

Three modes over the same event structure. In preimage mode the caller supplies a public key and the event fields; the answer holds the exact NIP-01 serialisation, the SHA-256 event id derived from it and the 32 bytes to sign, so the caller signs locally and no secret key ever crosses the connection.

Fetches https://domain/.well-known/nostr.json with the name query parameter and reads the mapping the domain publishes. The answer states the resolved public key in hex and as npub, the relay hints the document lists for that key, and the HTTP status and final URL after redirects, so a redirect to a login page is distinguishable from a genuine answer. Given an expected public key, the comparison is made and the result is reported as an explicit match or mismatch rather than left to the caller.

Measure achieved reliability against an SLO target from good and total events. Use it before an autonomous workflow acts on untrusted input, changes an API, retries a request, or evaluates production reliability. Returns bounded machine-readable JSON for $0.002 USDC via x402 on Base. Execution is deterministic, first-party, local-only, stateless, and does not call an upstream provider; structured validation failures are not billed.

Current levels of the three ECB key interest rates -- main refinancing operations (MRR_FR), deposit facility (DFR) and marginal lending facility (MLFR) -- straight from the official ECB Data Portal (dataflow FM, daily levels). Query: ?last=N (1-60, default 1) to include the N most recent daily observations per rate. Returns latest values plus dated series, in percent per annum; served with a 6h cache.

Near-real-time pump prices (EUR/L) for French gas stations from the official roulez-eco feed (data.economie.gouv.fr, updated continuously). Query: ?dept=75 (departement code) and/or ?city=Lyon, optional &fuel=gazole|sp95|sp98|e10|e85|gplc to sort cheapest-first and drop stations without that fuel, &limit=10 (1-40). Returns per station: address, lat/lon, per-fuel price with update timestamp, 24/7 automat flag. Cached 10 min.

Resolves an ISBN-10 or ISBN-13 to a normalized bibliographic record from Open Library (Internet Archive): title, authors, publishers, publish date, page count, ISBN identifiers, subjects and cover image URL. Query: ?isbn=9780140328721 (hyphens/spaces tolerated). Unknown ISBNs return 400 (not charged). 7-day cache. Built for catalog management, e-commerce listings and used-book pricing agents.

Offline validation of intermodal container numbers per ISO 6346: owner code, equipment category (U/J/Z), serial and check-digit verification (mod-11 with power-of-2 weights). Catches transcription errors before a booking or B/L is filed. Query: ?container=CSQU3054383. Returns valid flag, parsed parts and the computed check digit. Deterministic, cached 1 year.

European Central Bank reference exchange rates for any past date or date range (business days since 1999-01-04), via frankfurter.dev. Query: ?date=2026-05-01 for one day, or ?start=2026-05-01&end=2026-05-08 for a daily series (max 366 days), plus ?base=EUR&symbols=USD,GBP (symbols optional -> all). Series responses nest rates by date. Historical data is immutable; served with a 24h cache.

Real browser-side adoption signal from the official jsDelivr Stats API: global CDN hit rank, rank within npm, total hits over the period, previous-period comparison and a derived trend (up/down/flat, lower rank = more popular). Query: ?pkg=react&period=week (period: day, week, month, year). Complements npm download counts; cached 6h.

Latest METAR observation, decoded, for any ICAO airport worldwide (NOAA AviationWeather.gov): wind direction/speed/gust (kt), temperature/dewpoint (C), visibility, QNH altimeter (hPa), flight category (VFR/MVFR/IFR/LIFR) plus the raw METAR string. Query: ?ids=KJFK,LFPG (1-10 comma-separated ICAO codes). Observations refresh every 30-60 min; 5 min cache.

Monthly HICP inflation as annual rate of change (%) from Eurostat dataset prc_hicp_manr, the official primary source. Query: ?geo=EA|FR|DE|EU27_2020 &coicop=CP00 (all items) | CP011 (food) | CP045 (energy) &last_n=12 (1-24 months, default 1). Returns date-sorted observations plus the latest print; 24h cache. Data: Eurostat, CC BY 4.0.

Official Bank of Canada Valet observations, normalized JSON. Query: ?series=FXUSDCAD,FXEURCAD&recent=5 (1-10 comma-separated codes; FX pairs like FXUSDCAD/FXEURCAD/FXGBPCAD, overnight target rate V39079, prime rate V80691311). recent=N returns the last N daily observations (default 1, max 60). Primary-source CAD reference, published each business day; 6h cache.

Deterministic Legal Entity Identifier check for regulatory reporting pipelines (EMIR, MiFID II require a valid LEI per counterparty): structure regex and ISO 7064 mod 97-10 checksum over the 20-char code. Query: ?lei=HWUPKR0MPOU8FGXBT394. Returns valid, lou_prefix, entity_part and a failure reason. Filters typos before hitting the GLEIF registry (see /v1/global/lei for the live record). Pure offline, 1y cache.

Latest observed 15-min records from RTE's eCO2mix national real-time dataset (ODRE portal, Licence Ouverte 2.0). Per record: UTC timestamp, consumption vs D/D-1 forecasts (MW), production by source (nuclear, wind, solar, hydro, gas, coal, bioenergy, storage), grid CO2 intensity (g/kWh) and commercial exchanges per border. Query: ?rows=1-12 (default 4 = last hour). 15-min cache.

Near-real-time Great Britain national electricity demand outturn from the Elexon Insights (BMRS) open API: 5-minute MW readings sorted oldest to newest (default: last 24h = 288 points), plus a 'latest' field with the most recent value. ?last=N (1-500) sets how many recent points to return, e.g. ?last=12 = last hour. Upstream updates every ~5 min; served with a 5-min cache.

Live DNS records resolved via Cloudflare 1.1.1.1 DNS-over-HTTPS (public facts, real time). Query: ?name=anthropic.com&type=MX (type in A|AAAA|MX|TXT|NS|CNAME, default MX). Or ?name=anthropic.com&check=email -> combined MX + SPF + DMARC with an email_ready boolean, useful before emailing or invoicing a contact. JSON with records list; 5 min cache.

Live Ethereum mainnet gas pricing from PublicNode RPC: next-block base fee, 25/50/75th-percentile priority tips over the last 5 blocks (slow/std/fast), and a ready-to-sign recommendation (max_fee = 2*base + tip). Query: ?speed=slow|std|fast (default std). All values are decimal gwei, no hex parsing needed. 30s cache.

Latest-release metadata from the official PyPI JSON API (live): version, license, requires_python compatibility, requires_dist dependency specs (max 100), yanked flag, last upload time and project URLs. Query: ?pkg=requests. No personal author/maintainer data. 1h cache.

Pure astronomy and geometry on level ground: sun position by the NOAA method, shadow length as object height divided by the tangent of the sun elevation. Refraction is only applied to sunrise and sunset. Terrain slope, surrounding buildings, vegetation and diffuse light are not modelled, so a point outside the shadow can still be shaded in reality. Times are UTC.

Single-fact: what did the proposer of the latest block ACTUALLY get paid (priority fees + direct coinbase transfers — the value that reaches the validator, not the noisy block-value proxy)? Returns {block, proposer_payment_eth, builder, tx_count} plus a 1h aggregate {samples, mean_eth, median_eth, p90_eth, max_eth}. Per-block history export: /v1/premium/builder-bids.csv ($0.05, CSV or JSONL).

Single-fact wallet-safety check: is address X a known approval-drainer (malicious spender harvesting ERC-20 approvals to transferFrom-drain them — the JaredFromSubway $7.5M pattern) or a honeypot/bait token? Returns {flagged, as, risk_score, risk_band, top_flags} from the same live mainnet scanner + scorer as the premium counter-MEV feed. Check before you approve.

Single-fact: what does Ethereum mainnet gas cost RIGHT NOW? Returns the latest block’s base fee + blob base fee AND the consensus-computed next-block projection (not a guess — the protocol’s own EIP-1559/4844 arithmetic), straight from eth_feeHistory. Fields: {block, base_fee_gwei, blob_base_fee_gwei, gas_used_ratio, next_base_fee_gwei, next_blob_base_fee_gwei}. Bulk per-block history: /v1/premium/fee-history.csv ($0.05, up to 1024 blocks/call).

Single-fact: which builder has the largest slot share in the named window (24h|7d|30d)? Returns {builder, share_pct, slots_won}.