Explore APIs

US Treasury yield curve — constant-maturity market yields from 1-month to 30-year, daily history.

Google Trends interest over time for a keyword — search interest as a dated 0-100 series with country targeting (geo) and timeframe windows from the past hour back to 2004: daily points for 30/90-day windows, weekly for 12 months/5 years. For keyword trend analysis, search demand seasonality and SEO keyword research.

Stablecoin parallel-rate premium — how far the street price of a digital dollar (per-venue USDT quotes) diverges from the official FX rate in capital-controlled economies: venue table, median street rate, premium %, signal read. ARS, VES, BRL, COP, PEN, MXN, CLP, BOB; ARS includes the blue/MEP/CCL board. Live quotes, no LLM.

Signed attestation (ECDSA plus a post-quantum ML-DSA-65 companion) of on-chain wallet conditions across 37 chains: token balance, NFT ownership, EAS, Farcaster, view calls, ratio rules, account code (plain key, EIP-7702 delegation, or contract), and agent standing (ERC-8004 registration, ERC-7710 delegation validity). A verifiable boolean, never raw balances or code. Up to 10 conditions per pay-pe

Official $0.01 proof-of-life resource for SpendTheBits x402: returns a JSON heartbeat. Pay it to verify your agent's x402 client end to end.

Gas price: live gas fees for Ethereum, Base, Arbitrum, Polygon and Solana in one call. Use before sending a transaction to pick a fee or the cheapest chain. Returns base fee, slow/standard/fast priority fees, max fee, congestion, and the USD cost of a transfer, an ERC-20 transfer and a swap per chain, plus Solana priority fees. Optional chain. 0.001 USDC/call; failed calls are free.

Fetch any public URL, render client-side JS, strip nav/ads, return clean LLM-ready Markdown.

Use when you need callable agent services for a capability across protocols: x402 listings ranked by relevance weighted by 30-day paying wallets, plus hosted MCP servers from the Official MCP Registry (a capped subset, count in coverage; those naming x402, L402, MPP or pay-per-call first; that registry publishes no prices). L402 and MPP listings are not covered. ?q= required. $0.002 USDC per call.

Summarise IPv4 or IPv6 CIDR blocks into the minimal set (merging adjacent and overlapping blocks) plus the covering supernet.

Compare equal periodic buys (dollar-cost averaging) with one lump sum on the first date, over a list of prices.

Crypto price check: the current spot price of Bitcoin (BTC), Ethereum (ETH), Solana (SOL) or any token ticker in USD, cross-checked across five exchanges (Coinbase, Kraken, OKX, Binance, CoinGecko). Returns the median price, the spread between venues and a divergence flag, as a signed price oracle attestation your agent can cite. Use it before your agent trades, quotes, values a portfolio or settl

Ethereum mainnet ERC-20 verdict: AI grade and on-chain facts for one token contract. Not financial advice. Returns: a rule-graded token verdict on one token contract: grade (BASED/MID/COOKED/RADIOACTIVE, a stated rule over the contract's own state), a one-liner and a roast, and the facts read: code size, name, symbol, decimals, supply, owner(), proxy slots; plus the deepest Uniswap V3 pool's USD

A Hyperliquid account's perpetuals state — open positions, margin summary and withdrawable balance, for any 0x address.

Hotel search — find hotels & vacation rentals anywhere by destination with live nightly rates, star class, guest ratings, amenities, photos & coordinates as clean JSON.

Official public holidays by country and year, with regional subdivisions, localized names and normalized dates.

Trademark search / brand-name clearance / trademark availability check for any mark. Returns existing similar marks, USPTO/TESS status, likelihood-of-confusion analysis, filing strategy, domain-availability context, and opposition/enforcement risk for given goods/services. For IP and brand agents. Worldwide.

The catalog of Hyperliquid prediction-market outcomes and their metadata.

Student discounts / college student deals / verified student savings by category. Returns the best current verified student discounts for a category, with how to verify student status to claim each. For shopping and savings agents.

On-chain spot price of ETH or BTC in USDC from the deepest Uniswap v3 pools on Ethereum mainnet, read from a full node at the latest block (no third-party price feed). Pairs: ETH-USDC, BTC-USDC. Use it as an independent, verifiable price reference; it reflects the pool price, not an exchange average.

Is the stock market open right now? Deterministic market-status and trading-hours for the major global exchanges — NYSE, NASDAQ, LSE, Xetra, Euronext, TSE/JPX, HKEX, SSE, ASX, TSX, SIX, NSE/BSE. Returns is_open plus why it is shut (weekend, holiday, lunch break, pre/after-hours), the exchange local time, and the next open and close as ISO timestamps. Pass ?at= for any past or future moment. Zero e

Bounding box (min/max latitude and longitude) enclosing a radius in meters around a point, with pole and 180 degree handling.

Is wildfire smoke affecting the air here right now? Smoke tracker — AQI estimate, nearby active fires, health risk level, mask and indoor-air guidance, and evacuation status for any location.

mcp.digest, sold by Taifoon: 9 sellers behind this wall, the best-ranked one answers; code checks the answer before you are charged (a failed answer is not charged), Jev grades it after. Price 0.006795 USDC.

Parse a Cache-Control value, explain each directive, compute freshness and flag conflicts or leaks.

Aspect ratio of a width and height (simplified, nearest common ratio) or the missing side for a ratio, with CSS values.

Beer, wine and cider alcohol by volume from original and final gravity, with both standard formulas and attenuation.

WCAG contrast ratio between two hex colors with AA and AAA pass/fail for normal and large text.

Age in years, months, days and days lived, Korean and East Asian ages, next birthday with leap-day rules, and zodiac.

Dynamic range, levels and smallest step for a PCM bit depth, theoretical SNR, and the bit depth needed for a dB range.

Live EIP-1559 gas on Ethereum, Base, Arbitrum, Optimism, Polygon or BNB: base fee, slow/standard/fast priority tiers from the last 20 blocks, ready-to-use maxFeePerGas values, and estimated cost of an ETH transfer, ERC-20 transfer, approve and Uniswap swap.