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api.kadec0.xyz · 43 paid endpoints · listed 2026-10-27
Academic and scientific paper search API. Search research papers and scholarly literature across arXiv, PubMed, OpenAlex, Crossref, and Semantic Scholar in one call, deduplicated into a ranked result set: title, authors, year, venue, abstract, citation count, DOI, and direct PDF link. Query by keyword or restrict to one source; filter by year range; sort by relevance, recency, or citations. Keyless.
livelast check 4 days ago
100%valid x402 answers, 72 h
$54.82USDC received on Base, 7 days
42distinct payers, 7 days
74.0score (0-100)
Paid endpoints
| Method | Endpoint | Price | Networks |
|---|---|---|---|
| GET | api.kadec0.xyz/v1/usgs-quakes Real-time earthquake feed. Recent seismic events from USGS with magnitude, location, depth, and tsunami flag, filterable by magnitude, time, and radius. | $0.005 | Base |
| GET | api.kadec0.xyz/v1/weather Weather forecast and air quality for any location worldwide. Returns current conditions plus a 16-day daily weather forecast - temperature highs and lows, preci | $0.005 | Base |
| GET | api.kadec0.xyz/v1/cve CVE vulnerability lookup. Returns security vulnerability records by CVE id or keyword from the NIST National Vulnerability Database and GitHub Security Advisori | $0.01 | Base |
| GET | api.kadec0.xyz/v1/gas-oracle Ethereum gas price oracle. Returns the current Ethereum gas price as an EIP-1559 base fee plus priority-fee estimates across five confidence tiers, all in gwei, | $0.01 | Base |
| GET | api.kadec0.xyz/v1/geocode Geocoding and reverse geocoding. Converts an address or place name to latitude/longitude, or coordinates back to an address. | $0.01 | Base |
| GET | api.kadec0.xyz/v1/hackernews Hacker News feed. Top, new, and best front-page stories plus full-text story search — titles, scores, comment counts, and author for tech and startup news. | $0.01 | Base |
| GET | api.kadec0.xyz/v1/nutrition Food nutrition lookup. Calories, macros, and micronutrients for any food from the USDA FoodData Central database. | $0.01 | Base |
| GET | api.kadec0.xyz/v1/stackoverflow Stack Overflow Q&A. Programming question and answer search with scores, accepted-answer flags, tags, and answer bodies via the Stack Exchange API. | $0.01 | Base |
| GET | api.kadec0.xyz/v1/token-price Crypto token price and market data. Returns the live price of one or many tokens by coin id or ticker symbol, in a chosen vs-currency, with market cap, 24-hour | $0.01 | Base |
| GET | api.kadec0.xyz/v1/trending-coins Trending crypto coins. The coins most searched on CoinGecko right now, with rank, price, and market-cap rank. | $0.01 | Base |
| GET | api.kadec0.xyz/v1/author-search Author and researcher profile search. An author name returns matching researchers with current affiliation, publication count, total citations, h-index and i10- | $0.02 | Base |
| GET | api.kadec0.xyz/v1/defi-tvl DeFi TVL for protocols and chains. Returns total value locked per DeFi protocol or per chain via DefiLlama, with category, supported chains, and TVL change over | $0.02 | Base |
| GET | api.kadec0.xyz/v1/domain-info Domain WHOIS and DNS lookup. Registrar, creation and expiry dates, nameservers, and full DNS records (A, AAAA, MX, NS, TXT, CNAME) for a domain. | $0.02 | Base |
| GET | api.kadec0.xyz/v1/fda FDA recalls and adverse events. Drug, device, and food recall and adverse-event records from openFDA with classification, recalling firm, and reason. | $0.02 | Base |
| GET | api.kadec0.xyz/v1/github GitHub data. Repository stats, user profiles, and code-search results (stars, forks, language, topics, issues) via the GitHub REST API. | $0.02 | Base |
| GET | api.kadec0.xyz/v1/papers Academic and scientific paper search API. Search research papers and scholarly literature across arXiv, PubMed, OpenAlex, Crossref, and Semantic Scholar in one | $0.02 | Base |
| GET | api.kadec0.xyz/v1/recalls Consumer product recalls. A normalized multi-agency recall feed spanning FDA, CPSC, and NHTSA — product, reason, company, classification, and severity. | $0.02 | Base |
| GET | api.kadec0.xyz/v1/smart-search Smart, auto-routed research paper search. A broad field term is grounded against the OpenAlex taxonomy and returned as a coherent field cluster; a natural-langu | $0.02 | Base |
| GET | api.kadec0.xyz/v1/stablecoins Stablecoin supply data. Returns circulating supply for stablecoins broken down across chains via DefiLlama, filterable by peg type and by collateral mechanism, | $0.02 | Base |
| GET | api.kadec0.xyz/v1/topic-search Field and topic search for research papers. Give a broad field name or short phrase (like 'crispr' or 'exercise science') and get a coherent, taxonomy-grounded | $0.02 | Base |
| GET | api.kadec0.xyz/v1/dns-propagation DNS propagation checker. Compares a DNS record across public resolvers (Google, Cloudflare, Quad9, OpenDNS) to spot propagation lag or split-horizon answers. | $0.03 | Base |
| GET | api.kadec0.xyz/v1/email-validate Email validation and email list cleaning. Checks each email address for RFC syntax, a live MX record lookup returning the real mail hosts, disposable-domain det | $0.03 | Base |
| GET | api.kadec0.xyz/v1/interest-by-region Google Trends interest by region for a keyword. Returns the subregional breakdown of Google Trends search interest inside a country - by state, province, or reg | $0.03 | Base |
| GET | api.kadec0.xyz/v1/paper-details Citation lookup and reference list for a paper. Given a DOI, arXiv id, OpenAlex id, or PMID, returns its references (the works it cites) and its cited-by list ( | $0.03 | Base |
| GET | api.kadec0.xyz/v1/permits Building permit records. Construction and building permits across Chicago, NYC, Seattle, and San Francisco — type, status, address, cost, and issue date. | $0.03 | Base |
| GET | api.kadec0.xyz/v1/related-papers Literature review and related-paper discovery. Given a seed paper (arXiv id, DOI, or OpenAlex id) or a topic query, returns semantically similar and recommended | $0.03 | Base |
| GET | api.kadec0.xyz/v1/related-queries Google Trends related queries for a keyword. Returns the searches people run alongside a keyword in a given country: top queries scored 0-100 relative to each o | $0.03 | Base |
| GET | api.kadec0.xyz/v1/related-topics Google Trends related topics for a keyword. Returns the topics and named entities associated with a keyword in a given country, as top topics scored 0-100 relat | $0.03 | Base |
| GET | api.kadec0.xyz/v1/scrape Scrape any web page to clean markdown. A keyless web scraper that converts a single URL into LLM-ready markdown plus structured metadata (title, headings, links | $0.03 | Base |
| GET | api.kadec0.xyz/v1/yield-pools DeFi yield and APY across pools. Returns the top yield-farming pools via DefiLlama with current APY, base and reward APY split, TVL, chain, and project, filtera | $0.03 | Base |
| GET | api.kadec0.xyz/v1/paper-fulltext Full text and open-access PDF retrieval for a paper. Given an arXiv id, DOI, OpenAlex id, PMID, or PMCID, returns the readable body split into sections (introdu | $0.04 | Base |
| GET | api.kadec0.xyz/v1/congress-trades US congressional stock trades. Stock transactions disclosed by members of the House and Senate under the STOCK Act — politician, ticker, amount, and date. | $0.05 | Base |
| GET | api.kadec0.xyz/v1/market-sentiment Market fear & greed index. Aggregated investor sentiment from CNN Fear & Greed, the crypto Fear & Greed index, and the VIX volatility gauge. | $0.05 | Base |
| GET | api.kadec0.xyz/v1/sec-edgar SEC filings full-text search. Searches SEC EDGAR filings - 10-K, 10-Q, 8-K, and every other form type - by keyword, company name, ticker, or CIK, with date-rang | $0.05 | Base |
| GET | api.kadec0.xyz/v1/serp Web search results (SERP). Keyless web search returning ranked title, URL, and snippet for a query — with locale/region targeting, freshness filters (past day, | $0.05 | Base |
| GET | api.kadec0.xyz/v1/serp-multi Multi-engine web search (metasearch). One search query fanned out across 2-3 search engines (Brave, Yahoo, Yandex) with results deduplicated by URL and merged b | $0.05 | Base |
| GET | api.kadec0.xyz/v1/trend Google Trends interest over time for a keyword. Returns Google Trends search interest as a dated series indexed 0-100: weekly points across the default past 12 | $0.05 | Base |
| GET | api.kadec0.xyz/v1/whois-bulk Bulk WHOIS lookup. Registrar, dates, and nameservers for up to 10 domains in a single batch call. | $0.05 | Base |
| GET | api.kadec0.xyz/v1/lit-review 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 | $0.08 | Base |
| GET | api.kadec0.xyz/v1/serp-read Web search plus page reading in one call: answer with sources. Runs a web search, scrapes the top results, and returns the ranked search results together with e | $0.08 | Base |
| GET | api.kadec0.xyz/v1/website-audit Instant website SEO audit. On-page SEO, performance, and accessibility snapshot for any URL — title, meta tags, headings, links, image alt, load time, and an is | $0.08 | Base |
| GET | api.kadec0.xyz/v1/serp-batch Bulk web search: up to 5 search queries in a single call, each returning ranked title, URL, and snippet, with the same locale, freshness, and news filters as th | $0.10 | Base |
| GET | api.kadec0.xyz/v1/enrich Company domain enrichment. Firmographics, tech-stack detection, social profiles, and metadata for a company domain — a keyless one-call enrichment gateway. | $0.15 | Base |
Latest checks
| When | Endpoint | HTTP | ms | Result |
|---|---|---|---|---|
| 4 days ago | api.kadec0.xyz/v1/author-search | 402 | 230 | valid x402 v2 terms |
Income on Base (7 days)
| Day | Transfers | USDC | |
|---|---|---|---|
| 2026-11-01 | 476 | $4.93 | |
| 2026-10-31 | 1168 | $12.21 | |
| 2026-10-30 | 1038 | $11.35 | |
| 2026-10-29 | 827 | $8.85 | |
| 2026-10-28 | 328 | $10.81 | |
| 2026-10-27 | 75 | $1.18 | |
| 2026-10-26 | 127 | $2.91 | |
| 2026-10-25 | 251 | $2.61 |
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x402_provider_claim (sign with your payout address), and get an alert within minutes when it stops answering with x402_monitor_create ($5 for 30 days). Both work over MCP (https://logicnodes.io/mcp/v2) or POST https://logicnodes.io/v1/tools/<tool>.Income is all USDC received by the provider's payout address on Base, whatever the source. Score: 0-100: 50 x share of checks in the last 72 h that returned valid x402 payment terms + 30 x min(1, log10(1 + USDC received in 7 days) / 4) + 20 x min(1, log10(1 + distinct payers in 7 days) / 3). A provider never checked scores on income only; income is all USDC received by its payout address on Base, whatever the source. JSON: /v1/observatory/providers/api.kadec0.xyz