Explore APIs

Importance-ranked crypto headlines with per-article source links and publish times, plus a sentiment-scored market brief. Regenerated hourly; meta carries the snapshot's age and a fresh/stale verdict.

Korean exchange prices (Upbit, Bithumb) for a single token in KRW

Honeypot check, half a cent: can this token actually be sold? Simulated buy+sell verdict, buy/sell/transfer tax, mint authority, ownership renounced, transfer-pausable, blacklist — the raw flags, one source, no fusion. Base, Ethereum, BSC, Arbitrum, Polygon, Optimism, Avalanche. Cheapest token safety check before you trade; upgrade to /api/evmtoken ($0.015) for the fused CLEAR/CAUTION/AVOID verdic

Search onchain DEX pools and token, by contract address, name, or token symbol.

Validate IBAN structure and MOD-97 checksum. Does not establish account ownership, beneficiary identity or absence of fraud.

Current Crypto Fear & Greed Index (0-100) with its label (Extreme Fear → Extreme Greed), updated daily. A single market-mood gauge for risk-on/risk-off context. For trend over time use /fear-greed/compare or /fear-greed/history.

Web page to markdown for AI agents: fetch one URL and get its main content as clean, LLM-ready markdown (navigation, ads, footers and scripts removed) with title, description, language, word count and a token estimate. Uses the site's own Markdown version when it offers one. Useful for RAG, summarizing articles, research and feeding pages to an LLM. Not charged if the page can't be fetched or isn'

Query real-time stablecoin supply yield pools from Barker's index of 500+ DeFi protocols. Returns ranked rows with protocol_name, chain_name, asset_symbol, supply_apy_total (decimal — multiply by 100 for %), and supply_tvl (USD). Use for questions like 'best stablecoin yield', 'where to earn on USDC', 'compare lending rates', '稳定币利率'.

Crypto token price in USD, EUR and more — real-time spot prices for one or many coins by CoinGecko id (bitcoin, ethereum, solana).

Curated Bitcoin coinbase scriptSig messages (printable ASCII only). Pool tags, BIP-comment campaigns, political statements. Window up to 7d.

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

EDINET filing calendar: annual securities reports (yukashoken hokokusho) filed by Japanese listed companies in a date range. Returns company code, EDINET document ID, fiscal period, accounting standard (JGAAP/IFRS/USGAAP) and the exact filing timestamp for each report — track new disclosures, trigger data pipelines, or find which Japanese stocks just reported. Query: /v2/calendar?from=2026-06-20&t

Live current weather conditions for any city, sourced from Open-Meteo. Independently monitored by x402-list.com: 100% uptime since Oct 27, 2026, 14/14 x402 compliance checks (as of Oct 31, 2026). Evidence: https://x402-list.com/services/agentx402pay

Parse RSS/Atom feeds into structured JSON. Pay per call with USDC (x402) or credits - archtools.dev

Real-time web search for AI agents — search the web and get ranked SERP-style results as clean JSON: title, URL, snippet, relevance score, optional LLM-generated answer. Find up-to-date information online — latest news, current events, finance. Date, domain and exact-phrase filters.

Paid IP intelligence endpoint returning normalized geolocation and ASN data for a single IPv4 or IPv6 address.

utilpeek (Tanod) file upload: PDF, Office, image, audio, CSV, JSON or text stored for up to 24 hours and returned as a download link. Use when an agent holds a file and must give the next tool a URL for it: a link that expires within 24 hours.

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.

Use when an agent or user wants a clean original joke — family-friendly humor from the Synthetic Universe. Pure compute, no upstream. Optional session id avoids repeats. Use permitted: build it into your products and services, paid or free. Raw redistribution of the feed itself is prohibited.

AgentWorld Agent Leaderboard - top AI agents ranked by USDC wealth or reputation score. Includes job role, city, mood, personality archetype. Updated every 3 minutes by the tick engine. Filter by city or job.

Convert any value between units: length (m/km/mi/ft/in/yd/nmi, plus Russian verst/sazhen/arshin/vershok), mass (g/kg/lb/oz/tonne, plus Russian pood/funt/zolotnik), area (m2/ft2/km2/acre/hectare) and temperature (C/F/K). Pass ?value=<n>&from=<unit>&to=<unit>. Returns the converted value and the unit category.

A short plain-text summary of one Wikipedia article, with its image and last update. Content is CC BY-SA 4.0.

Current mid price for every Hyperliquid asset (perps + spot) in one call — a fast whole-venue price snapshot.

Chess Daily answer check — legally validates a complete UCI principal line against the pinned daily puzzle.

Checksum tier (deterministic, no LLM): verifies the exact bytes served at a public URL hash to a claimed sha256, by independent double re-fetch. Use it to confirm a download or artifact matches its published checksum. Bodies up to 3 MB; dynamic pages return unverifiable, never a guess. sha256 only. First 100 checks per client are free: resend with header X-Use-Free-Allowance: yes and no payment to

Payment integration check for 0.001 USDC; no external data lookup. Returns time, rail, network mode and free/paid capabilities. HTTP payment options can include Base, Polygon, Arbitrum and XDC; the challenge lists currently available networks for each transport. The receipt identifies the paid network and transaction. Business/professional use only. Terms: https://402rates.com/data-terms/

DNS A record lookup — resolve any hostname or domain to its IPv4 addresses, returned as a clean JSON list. For host resolution, connectivity and uptime checks, IP-reputation enrichment and infrastructure mapping.

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.

Live feed of every active rail disruption across the Japanese (JP) network in one call — delays and suspensions with bilingual summaries, refreshed continuously from ODPT. Built for MONITORING agents: poll on an interval (e.g. every 5 minutes) to maintain a nationwide incident watchlist without querying stations one by one.