| Citation Lookup And Reference List For A Paper API 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 (recent works that cite it), plus full metadata and citation count — for bibliography building and citation lookup. Keyless via OpenAlex and Semantic Scholar. | kadec0.xyz | - | $0.03 | listed |
| Cited Coding Research Cited coding research for agents: library/API usage answers, error diagnosis and best-practice lookups with real citations. $0.10 USDC per call. | attester.dev | - | $0.10 | listed |
| Claude Feature Watch API Returns a list of recently merged PRs across Anthropic/Claude repos (title, author, merge date, labels) with per-repo counts — track new Claude Code and SDK capabilities as they ship. | forgemesh.io | - | $0.02 | listed |
| Clinicaltrials.gov API ClinicalTrials.gov — get full details of a specific trial by NCT ID including eligibility, outcomes, and locations. | memoryapi.org | - | $0.005 | listed |
| Clinvar Genetic Variants API ClinVar genetic variants — pathogenic/benign variants for any gene with clinical significance and conditions. | memoryapi.org | - | $0.005 | listed |
| Cloudflare API Render any URL or HTML as a PDF. Supports custom paper size, margins, landscape, and background printing. | stableflare.dev | - | $0.05 | listed |
| Cloudflare API Extract clean Markdown from any URL. Renders JavaScript before extraction. | stableflare.dev | - | $0.02 | listed |
| Cloudflare API Fetch the fully rendered HTML of any URL after JavaScript execution. | stableflare.dev | - | $0.02 | listed |
| Cloudflare Worker Security Review API Review Cloudflare Worker source and optional wrangler.toml for hardcoded secrets, unsafe CORS, missing admin auth, sensitive logging, and dynamic code execution. | workers.dev | - | $0.10 | listed |
| Cny Cad Cny Cad — an agent-callable cny cad service, payable over x402 (USDC on Base). Provided via Apify. Priced around 0.01 USD per call. | myceliasignal.com | - | $0.01 | listed |
| CodePulse Agentic API Generates a temporary disposable inbox address using the free 1secmail.com service. | workers.dev | - | $0.01 | listed |
| CodePulse Agentic API Queries target URL headers to score security configurations (HSTS, CSP, X-Frame-Options). | workers.dev | - | $0.01 | listed |
| CodePulse Agentic API Polls the disposable inbox for messages and verification codes. | workers.dev | - | $0.01 | listed |
| CodePulse Agentic API Queries historical website snapshots from the free Archive.org API. | workers.dev | - | $0.01 | listed |
| CodePulse Agentic API Lists active public numbers available for temporary SMS verification codes. | workers.dev | - | $0.15 | listed |
| CodePulse Agentic API Queries public SMS verification boards to retrieve recent OTP codes. | workers.dev | - | $0.02 | listed |
| Coin Flip Flip a coin for a small USDC payment on Base mainnet. Returns heads or tails. | vercel.app | - | $0.001 | listed |
| CoinGecko Crypto Price & Data Top crypto coins ranked by market cap — paginated market data (price, market-cap rank, symbol) in any currency, CoinGecko-sourced. | x402atlas.com | - | $0.005 | listed |
| CoinGecko Crypto Price & Data OHLC candlestick data for crypto — daily open/high/low/close candles over 1-365 days for any coin by CoinGecko id, chart-ready. | x402atlas.com | - | $0.005 | listed |
| CoinGecko Crypto Price & Data Trending crypto coins in the last 24h — the most-searched tokens on CoinGecko right now with name, symbol and market-cap rank. | x402atlas.com | - | $0.005 | listed |
| CoinGecko Crypto Price & Data Crypto token price in USD, EUR and more — real-time spot prices for one or many coins by CoinGecko id (bitcoin, ethereum, solana). | x402atlas.com | - | $0.005 | listed |
| CoinGecko Crypto Price & Data Historical crypto price on a specific date — price, market cap and 24h volume snapshot for any coin by CoinGecko id, in USD or more. | x402atlas.com | - | $0.005 | listed |
| Commerce Escrow Status 🆕 First tooling for Base's Commerce Payments protocol (AuthCaptureEscrow): reconciles two-phase auth/capture payments — in escrow, captured, charged, voided, refunded, or payer-RECLAIMABLE because the operator missed the capture window. Filter by payment= (infoHash), payer=, receiver= or operator=, or omit everything for the network feed. The order-reconciliation read merchants and agents need before trusting onchain commerce. | com.tr | - | $0.04 | listed |
| Company Name Search Across Jurisdictions API Company name search across jurisdictions. jurisdiction=lei searches the global GLEIF LEI database (all countries); jurisdiction=jp searches the official Japan National Tax Agency corporate registry. Returns registered legal names, identifiers, and addresses. KYB / counterparty verification primitive. | japanagent.dev | - | $0.002 | listed |
| Company Report API Atomic DeltaSignal company report aggregate for one issuer: readiness, fundamentals, alpha signals, peer ranking, covenant stress, and advisory SPECTRA support. | aitrailblazer.net | - | $0.60 | listed |
| Completions API Get OpenAI-compatible inference from many models at market prices via Surplus Intelligence. | surplusintelligence.ai | - | $0.003301 | listed |
| Compliance API Compliance gap mapping for a CVE or threat actor across 11 frameworks: NERC CIP, IEC 62443, NIST 800-82, NIST CSF 2.0, CISA CPG, Saudi NCA OTCC, UAE NESA IA. Pass ?cve_id=CVE-2023-38802 or ?actor=SANDWORM, optionally &framework=<value> to filter. Returns triggered controls (e.g. CIP-007-6 R2, IEC 62443-3-3 SR 5.1), status (NON_COMPLIANT_IF_UNMITIGATED / REVIEW_REQUIRED), required action, and compensating controls. For automated compliance reporting agents on cron. | onrender.com | - | $0.04 | listed |
| Compliance Check Combined counterparty screening for an address: direct OFAC sanctions match, EOA/contract profile, and (for contracts) risk flags — rolled into a single recommendation (blocked / review / clear). Built for compliance agents. | com.tr | - | $0.03 | listed |
| Compliance Evidence Mapper Map compliance audit email requests to evidence items, owners, systems, and follow-up questions by framework. | workers.dev | - | $0.15 | listed |
| Concierge Agent Unlock one creator RWA signal (full intelligence summary) | conc-exe.xyz | - | $0.10 | listed |
| Conditions API Reference catalog of trade/quote condition codes (the numeric `conditions` seen on trades) with names, types, data types, and SIP mappings. From x402stock, a pay-per-call market & economic data API for AI agents. No API key or account; pay in USDC via x402. | vercel.app | - | $0.01 | listed |
| Congress Stock Trades US congressional stock trades. Stock transactions disclosed by members of the House and Senate under the STOCK Act — politician, ticker, amount, and date. | kadec0.xyz | - | $0.05 | listed |
| ConsumerPulse US consumer-demand signal (retail sales) | lonestaroracle.xyz | - | $0.05 | listed |
| Contract Danger Scanner Reads a verified contract's ABI and flags owner-callable abuse functions: mint (dilute), pause (freeze exit), blacklist (block your wallet), setFee/setTax (tax you after entry), withdraw/sweep (pull funds), upgrade (swap logic). An unverified contract is itself a red flag. Diligence a price feed can't give. | com.tr | - | $0.04 | listed |
| Contract Introspection Via ETH Call API Contract introspection via eth_call - name, symbol, decimals, and ERC20/721/1155 interface support | onesource.io | - | $0.005 | listed |
| Convert API Single-shot script conversion of Japanese (JP) text between hiragana, katakana, and romaji (Hepburn/Nippon/Passport styles). Lighter than /furigana — for text that is already kana, with no morphological analysis. Use for quick kana↔romaji transliteration. | agentic-jp.com | - | $0.005 | listed |
| Correlation API Pearson correlation of a coin's returns vs BTC (-1 to +1) over the period. Use to judge diversification and whether an alt is moving independently or just tracking BTC. A correlation coefficient, not a beta or causation claim. | swaphunt.dev | - | $0.003 | listed |
| Country Info API Country reference card by ISO code (alpha-2/alpha-3/numeric) or English name: ISO 3166 codes, official name, current ISO 4217 currency (Bulgaria = EUR since 2026-01-01), dialling prefix, IANA ccTLDs (incl. IDN), languages, EU/EEA/Schengen/euro-area membership and the EU VAT prefix (Greece = EL). 56 countries: EU-27, EEA/EFTA, GB, US + 24 majors. Compiled from ISO/IANA/ITU/europa.eu sources, dated `asOf`. | 402utils.com | - | $0.001 | listed |
| Create A Crypto Off Ramp Transfer API Create a crypto off-ramp transfer: sell USDC and send fiat to a bank account. From a locked quote and a recipient, returns a transfer_id and a Base USDC deposit_address plus the exact amount to send. Fund it on-chain, then call /confirm-transfer. Converts stablecoin to a bank payout in 80+ currencies. Funding wallet KYC and sanctions enforced upstream. Pay 0.01 USDC. | madhousewallet.com | - | $0.01 | listed |
| Creator autocomplete Creator autocomplete | influship.com | - | $0.01 | listed |
| Cross Category Pivot Across All Telesint Intel API Cross-category pivot across all TeleSint intel. Use ?q= for broad keyword or combine filters: category, severity, sector, country, tag, ttp, name, organization, min_confidence, since. Returns items[] across any category. | onrender.com | - | $0.04 | listed |
| Crypto Data Agent Top DeFi yield pools with APY/TVL, filterable by chain (DefiLlama). | vercel.app | - | $0.002 | listed |
| Crypto OHLC Candles Historical OHLC candles for a crypto pair (e.g. BTC-USD) — for technical analysis and backtesting. Query: pair; granularity (1m, 5m, 15m, 1h, 6h, 1d — default 1h); limit (1-300, default 100) for the latest window, OR start & end (ISO8601 or unix secs) for a backtest range paginated server-side up to 3000 candles — months of history in one call. Returns candles oldest->newest, each {t, o, h, l, c, v}. Real-time from Coinbase. | shizu.me | - | $0.005 | listed |
| Crypto Off Ramp Quote API Crypto off-ramp quote: sell USDC (or another stablecoin) and cash out to a bank account. Given a target currency (ISO 4217) and a USD source amount, returns the FX rate, fees, and how much fiat the recipient receives. First step to convert crypto to fiat and pay out to a bank in 80+ currencies. Returns quote.targetAmount and a quoteId to lock the rate for a transfer. Pay 0.01 USDC. | madhousewallet.com | - | $0.01 | listed |
| Crypto Perp Funding & Sentiment Supported perpetual-futures trading pairs — the list of symbols (BTCUSDT, ETHUSDT, …) the funding-rate scanner and signals cover, as a clean snake_case envelope. | x402atlas.com | - | $0.005 | listed |
| Crypto Perp Funding & Sentiment Crypto Fear & Greed index — the current market-sentiment score (0-100) and its label (Extreme Fear … Extreme Greed), as a clean snake_case envelope. | x402atlas.com | - | $0.005 | listed |
| Crypto Perp Funding & Sentiment Crypto perpetual-futures funding-rate scanner — the top funding rates ranked across ~100 Binance perp markets (rate, 8h %, who-pays-who direction, mark price, next funding time). Spot funding arbitrage and crowded positioning in one call. | x402atlas.com | - | $0.02 | listed |
| Crypto Spot Price Current spot price for crypto trading pairs. Input: pair — a single pair (BTC-USD) or up to 10 comma-separated pairs (BTC-USD,ETH-USD,SOL-USD) returned in ONE call for the same price — poll a whole portfolio per tick. Returns amount and currency per pair. Real-time from Coinbase. | shizu.me | - | $0.004 | listed |
| Crypto TA Signals Multi-indicator technical analysis (SMA/EMA crosses, Bollinger, RSI, candlestick patterns, support/resistance, trendlines, experimental Elliott Wave) for any crypto pair. | tradesnack.com | - | $0.01 | listed |
| Crypto To Bank Off Ramp API Crypto-to-bank off-ramp: get the recipient bank-detail fields required to pay out (cash out) in a given currency when selling USDC to fiat. Returns dynamic field descriptors (text/select/radio/date) with validation rules and allowed values, grouped by account type. Empty-key placeholder options are stripped. Use this to know which bank details to collect before creating a payout recipient. Pay 0.01 USDC. | madhousewallet.com | - | $0.01 | listed |