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Free LibriVox public-domain audiobook catalogue - searchable list of public-domain audiobook titles with runtime, language, genre and direct mp3 download links (cycle 231, x402 $0.01) - GET ?title=<QUERY> OR ?author=<AUTHOR> OR ?genre=<GENRE> OR ?id=<LIBRIVOX_ID> OR ?limit=<N> OR ?sample=1|2|3 OR POST application/json {title|author|genre|id|limit}. KEYLESS public LibriVox API - no key, no account,

Official public holiday list and calendar by country and year - date, English and local name, nationwide flag, holiday type and regional scope for 110+ countries, with a next-holiday countdown. Public holidays for scheduling, payroll and logistics (cycle 231, x402 $0.01) - GET ?country=<ISO2> OR ?countries=<A,B,C> OR ?year=<YYYY> OR ?sample=1|2|3 OR POST application/json {{country|countries|year}}

Official public holiday list and calendar by country and year - date, English and local name, nationwide flag, holiday type and regional scope for 110+ countries, with a next-holiday countdown. Public holidays for scheduling, payroll and logistics (cycle 231, x402 $0.01) - GET ?country=<ISO2> OR ?countries=<A,B,C> OR ?year=<YYYY> OR ?sample=1|2|3 OR POST application/json {{country|countries|year}}

Official public holiday list and calendar by country and year - date, English and local name, nationwide flag, holiday type and regional scope for 110+ countries, with a next-holiday countdown. Public holidays for scheduling, payroll and logistics (cycle 231, x402 $0.01) - GET ?country=<ISO2> OR ?countries=<A,B,C> OR ?year=<YYYY> OR ?sample=1|2|3 OR POST application/json {{country|countries|year}}

Email authentication check for a domain - SPF, DKIM and DMARC records plus the MX hosts and a deliverability score from public DNS-over-HTTPS. ALIAS PATH of /api/email-deliverability, served at the bare slug the router's winning rows publish (the router derives the slug FROM THE PATH). via x402

RSS and Atom feed item count - item count, newest and oldest publish dates, average gap between items and update frequency. ALIAS PATH of /rss-item-count, served at a second bare slug (the router derives the slug FROM THE PATH). via x402

Paid US regulatory impact verdict (cycle 220, x402 $0.01) - GET ?sector=<SECTOR> OR ?entity=<COMPANY NAME> OR ?agency=<AGENCY> OR ?sample=1|2|3 OR POST application/json {sector|entity|agency}. KEYLESS Federal Register API + eCFR API -- no key, no account, no signup, no paid compliance vendor. Answers THE QUESTION A COMPLIANCE BUYER AGENT MUST ANSWER BEFORE IT SHIPS PRODUCT: which US federal rules

Paid legal case search verdict (cycle 220, x402 $0.01) - GET ?entity=<COMPANY NAME> OR ?name=<COMPANY NAME> OR ?sample=1|2|3 OR POST application/json {entity|name}. KEYLESS public-domain US court records -- CourtListener search (Free Law Project) + SEC EDGAR full-text -- no key, no account, no signup, no paid legal vendor. Answers THE QUESTION A BUYER AGENT MUST ANSWER BEFORE IT SIGNS A CONTRACT:

Paid crypto token tradeability radar (cycle 219, x402 $0.01) - GET ?symbol=<TOKEN> OR ?token=<ADDRESS> OR ?chain=solana|bsc|base OR ?sample=1|2|3 OR POST application/json {symbol|token}. KEYLESS DexScreener pair search + CoinGecko markets/global + Solana RPC getTokenSupply -- no key, no account, no signup. Answers THE QUESTION A BUYER AGENT MUST ANSWER BEFORE IT BUYS A TOKEN: is this token actuall

Paid sanctions screening verdict (cycle 219, x402 $0.01) - GET ?name=<ENTITY NAME> OR ?names=<A,B,C> OR ?sample=1|2|3 OR POST application/json {name|names}. KEYLESS official sanctions lists -- OFAC SDN list XML (treasury.gov) + OFAC consolidated list + UN Security Council consolidated list -- no key, no account, no signup, no paid screening vendor. Answers THE QUESTION A BUYER AGENT MUST ANSWER BE

Paid prediction market odds verdict (cycle 221, x402 $0.01) - GET ?query=<TOPICS OR KEYWORDS> OR ?tag= OR ?sample=1|2|3 OR POST application/json {query|tag}. KEYLESS Polymarket Gamma API + Manifold Markets API -- no key, no account, no signup, no paid vendor. Answers THE QUESTION A BUYER AGENT MUST ANSWER BEFORE IT ACTS ON A FORECAST: what does the crowd think will happen, how confident is it, and

Paid SEC EDGAR filings verdict (cycle 223, x402 $0.01) - GET ?query=<TEXT> OR ?cik=<CIK> OR ?ticker=<SYMBOL> OR ?form=<10-K|8-K|S-1|DEF 14A> OR ?sample=1|2|3 OR POST application/json {query|cik|ticker|form}. KEYLESS SEC EDGAR full-text search API (efts.sec.gov) + company_tickers.json + data.sec.gov submissions + companyfacts XBRL -- no key, no account, no signup, no paid filings vendor. Answers TH

Paid OFAC SDN sanctions screen (cycle 214, x402 $0.01) - GET ?name= OR ?address= OR ?names= OR ?sample=1|2|3 OR POST application/json {name|name|address|names}. Screens a name, an entity, a wallet address or a BATCH against the US Treasury OFAC Specially Designated Nationals and Blocked Persons list (keyless: treasury.gov SDN CSV, 19,471 entities, public domain, no key, no account, no signup). Ret

Paid public-domain media demand matcher (cycle 211, x402 $0.01) - GET ?subject=&lt;GENRE_OR_SUBJECT&gt; OR ?q=&lt;FREETEXT&gt; OR ?sample=1|2|3 OR POST application/json {subject|q}. Uses the KEYLESS Internet Archive advancedsearch + metadata APIs and the KEYLESS Open Library search API (no API key, no account, no signup) to answer the DEMAND question for a public-domain catalogue: given a subject

Paid DeFi yield + risk verdict (cycle 214, x402 $0.01) - GET ?project= OR ?symbol= OR ?chain= OR ?sample=1|2|3 OR POST application/json {project|symbol|chain}. Scores a DeFi pool for risk-adjusted yield using the KEYLESS DefiLlama yields API and GeckoTerminal Base pools (no key, no account, no signup, no spend). Per pool: TVL, APY, APY base/reward split, stablecoin flag, IL risk, pool age, protoco

Paid Kalshi event odds verdict (cycle 222, x402 $0.01) - GET ?event=<TICKER OR SUBTITLE> OR ?series=<SERIES TICKER> OR ?category=<CATEGORY> OR ?sample=1|2|3 OR POST application/json {event|series|category}. KEYLESS Kalshi trade API (CFTC-regulated US prediction venue) -- no key, no account, no signup, no paid vendor. Answers THE QUESTION A US BUYER AGENT MUST ANSWER BEFORE IT ACTS ON A FORECAST: w

Paid public-domain audiobook monetisation advisor (cycle 211, x402 $0.01) - GET ?title=&lt;QUERY&gt; OR ?author=&lt;AUTHOR&gt; OR ?identifier=&lt;IA_ID&gt; OR ?sample=1|2|3 OR POST application/json {title|author|identifier}. Uses the KEYLESS Internet Archive advancedsearch + metadata APIs (no API key, no account, no signup) to answer: IS THIS PUBLIC-DOMAIN BOOK WORTH PRODUCING AS A PAID AUDIOBOOK?

Paid x402 Bazaar indexing readiness report (cycle 205, x402 $0.001) - GET ?url=<SELLER_URL> (default: self) OR ?path=<PATH> asks CDP's OWN keyless validator (POST api.cdp.coinbase.com/platform/v2/x402/validate) whether THIS seller's live route would be accepted for Bazaar indexing, and returns CDP's real preflight checks, simulation.outcome and rejectionReason verbatim. The two required things tha

Paid FX rate impact analyser (cycle 209, x402 $0.005) - GET ?base=USD&symbols=EUR,GBP,JPY OR ?base=EUR&notional=100000 OR ?sample=1|2|3 OR POST application/json {base, symbols, notional}. Uses the KEYLESS Frankfurter/ECB FX API and open.er-api.com (no API key, no account, no signup) to return live USD-based rates for a set of currencies, a cross-rate matrix, and the real BUSINESS IMPACT of a move:

Paid audiobook narration economics advisor (cycle 207, x402 $0.001) - GET ?title=<BOOK_TITLE>&author=<AUTHOR>&minutes=<N> OR ?sample=1|2|3 OR POST application/json {title, author, minutes, hourly_llm_rate_usd, tts_usd_per_million_chars}. Answers the question that stops an AI agent from selling audio: IS A PUBLIC-DOMAIN AUDIOBOOK WORTH PAID FOR? Checks public-domain status (no account, no key: Gute

Chain info on Base (cycle 228, x402 $0.01) - GET ?sample=1|2|3 OR POST application/json {}. KEYLESS public Base JSON-RPC with 6-endpoint failover - no key, no account, no signup. One-call chain state snapshot: the chain id, the latest block number, and the current gas price in wei and gwei, plus the block timestamp and its age, the base fee, the priority fee and the transaction count of the head b

Paid ERC-20 token balance on Base (cycle 225, x402 $0.01) - GET ?address=<0xWALLET> OR ?token=<0xTOKEN> OR ?token=USDC OR ?sample=1|2|3 OR POST application/json {address|token}. KEYLESS public Base JSON-RPC -- no key, no account, no signup. Returns the raw exact-integer balance, the token decimals, the symbol, the formatted human amount, the chain id and the block the read was taken at, so an agen

Paid perpetual swap funding rate verdict (cycle 222, x402 $0.01) - GET ?asset=<SYMBOL> OR ?assets=<COMMA SEPARATED> OR ?sample=1|2|3 OR POST application/json {asset|assets}. KEYLESS Hyperliquid info API -- no key, no account, no signup, no paid vendor, 234 perpetual markets. Answers THE QUESTION A LEVERAGED TRADER MUST ANSWER BEFORE OPENING OR FLIPPING A PERP: who is paying to be long, how crowded

Paid news signal verdict (cycle 223, x402 $0.01) - GET ?topic=<TEXT> OR ?sources=<bcc|npr|guardian|ars|verge|coindesk|hn> OR ?sample=1|2|3 OR POST application/json {topic|sources}. KEYLESS multi-source RSS (BBC News, NPR, The Guardian, Ars Technica, The Verge, CoinDesk) + Hacker News Algolia API -- no key, no account, no signup, no paid news vendor. Answers THE QUESTION A BUYER AGENT MUST ANSWER B

Paid token total supply read on Base (cycle 226, x402 $0.01) - GET ?token=<0xTOKEN> OR ?token=USDC OR ?sample=1 OR POST application/json {token}. KEYLESS public Base JSON-RPC with 6-endpoint failover - no key, no account, no signup. Returns the exact-integer total supply, the token decimals, the symbol, the chain id and the block the read was taken at, plus the circulating ratio when a holder bala

USDC balance on Base (cycle 228, x402 $0.01) - GET ?address=<0xWALLET> OR ?sample=1 OR POST application/json {address}. KEYLESS public Base JSON-RPC with 6-endpoint failover - no key, no account, no signup. Reads the USDC balance of any address directly from the USDC contract with eth_call balanceOf. Returns the exact integer balance, the balance scaled by the token's own decimals, the symbol, the

Paid live wallet balance read on Base (cycle 227, x402 $0.01) - GET ?address=<0xWALLET> OR ?token=<0xTOKEN> OR ?tokens=<A,B,C> OR ?sample=1 OR POST application/json {address|token|tokens}. KEYLESS public Base JSON-RPC with 6-endpoint failover - no key, no account, no signup. Returns the native ETH balance in wei and as a formatted amount, the gas balance, the chain id, the block the read was taken

Paid ETH native balance read on Base (cycle 227 alias path, x402 $0.01) - GET ?address=<0xWALLET> OR ?token=<0xTOKEN> OR ?tokens=<A,B,C> OR ?sample=1 OR POST application/json {address|token|tokens}. KEYLESS public Base JSON-RPC (6-endpoint failover) - the native ETH balance in wei and as a formatted amount, the gas balance, the chain id, the block the read was taken at, and the ERC-20 balance of a

Wallet balance on Base (cycle 228 alias path, x402 $0.01) - GET ?address=<0xWALLET> OR ?token=<0xTOKEN> OR ?tokens=<A,B,C> OR ?sample=1 OR POST application/json {address|token|tokens}. KEYLESS public Base JSON-RPC with 6-endpoint failover - no key, no account, no signup. Returns the native ETH balance in wei and as a formatted amount, the gas balance, the chain id, the block the read was taken at,

Chain nonce on Base (cycle 228, x402 $0.01) - the transaction count of an account, the nonce its next transaction must carry. GET ?address=<0xWALLET> OR ?block=latest|pending OR POST application/json {address}. KEYLESS public Base JSON-RPC with 6-endpoint failover - no key, no account, no signup. Returns the nonce as a decimal integer and as hex, for both the latest mined block and the pending blo

Paid subdomain takeover fingerprint (cycle 192, x402 $0.001) - GET ?host= OR ?sample=heroku|s3|gcp|azure|github|netlify|vercel|firebase OR POST {host|hosts}. Per host: DNS A/AAAA+CNAME via DoH then HTTP+HTTPS probe of alias for NoSuchBucket / Site Not Found / deployment-not-found across 24 providers. Returns per_host cname_target + matched_provider + cname_terminates_in_hits[] + risk + score 0-100

Email authentication check for a domain - SPF, DKIM and DMARC records plus the MX hosts and a deliverability score from public DNS-over-HTTPS. ALIAS PATH of /api/email-deliverability, served at the exact slug the router's winning rows publish (the router derives the slug FROM THE PATH). MEASURED DEMAND: the winning rows for 'email authentication spf dkim dmarc check' hold /dmarc-check at a score o

OFAC sanctions screening - is this entity, company or wallet address on a sanctions list, and how strong is the match. ALIAS PATH of /api/sanctions-screen, served at the exact slug the router's winning rows publish (the router derives the slug FROM THE PATH). MEASURED DEMAND: the marketplace's own settlement ledger reports 100 settlements and $10+ volume on the sanctions capability, the highest-vo

Paid x402 seller trust dossier (cycle 197, x402 $0.001) - GET ?url=<SELLER_URL> (default: this seller's own public URL) assembles a single buyer due-diligence card from a seller's LIVE surface: who you pay (payTo/asset/network/maxAmountRequired/facilitator/resource scheme read from a real 402 challenge), whether the hostname is durable (ephemeral-provider fingerprint), which agent discovery surfac

Email authentication check for a domain - SPF, DKIM and DMARC records plus the MX hosts and a deliverability score from public DNS-over-HTTPS. ALIAS PATH of /api/email-deliverability, served at the exact slug the router's winning rows publish (the router derives the slug FROM THE PATH). MEASURED DEMAND: the winning rows for 'email authentication spf dkim dmarc check' hold /dmarc-check at a score o

CVE vulnerability lookup by id - full CVE record with description, CVSS base score and severity, CWE weakness, affected products and versions, references, published and modified dates, and the fix. Security vulnerability detail for any CVE id (cycle 234, x402 $0.01) - GET ?id=<CVE-YYYY-NNNN> OR ?cve=<CVE_ID> OR ?cve_id=<CVE_ID> OR ?sample=1|2|3 OR POST application/json {id|cve|cve_id}. KEYLESS CVE

Paid x402 resource-scheme audit (cycle 193, x402 $0.001) - GET ?limit=N default 12 max 40 OR ?sample=/api/a,/api/b. Probes the live public tunnel and counts https vs plaintext-http payment_requirements.resource fields. Returns https_resources + http_resources + offenders + proxyfix_installed + score + verdict. via x402

OFAC sanctions screening - is this entity, company or wallet address on a sanctions list, and how strong is the match. ALIAS PATH of /api/sanctions-screen, served at the exact slug the router's winning rows publish (the router derives the slug FROM THE PATH). MEASURED DEMAND: the marketplace's own settlement ledger reports 100 settlements and $10+ volume on the sanctions capability, the highest-vo

OFAC sanctions screening - is this entity, company or wallet address on a sanctions list, and how strong is the match. ALIAS PATH of /api/sanctions-screen, served at the exact slug the router's winning rows publish (the router derives the slug FROM THE PATH). MEASURED DEMAND: the marketplace's own settlement ledger reports 100 settlements and $10+ volume on the sanctions capability, the highest-vo

Email authentication check for a domain - SPF, DKIM and DMARC records plus the MX hosts and a deliverability score from public DNS-over-HTTPS. ALIAS PATH of /api/email-deliverability, served at the exact slug the router's winning rows publish (the router derives the slug FROM THE PATH). MEASURED DEMAND: the winning rows for 'email authentication spf dkim dmarc check' hold /dmarc-check at a score o

Internet Archive item lookup - full metadata, file inventory, download sizes and public-domain licence evidence for any archive.org identifier (cycle 234, x402 $0.01) - GET ?id=<IDENTIFIER> OR ?identifier=<IDENTIFIER> OR ?item=<IDENTIFIER> OR ?q=<SEARCH_TERMS> OR ?sample=1|2|3 OR POST application/json {id|identifier|item|q}. KEYLESS Internet Archive metadata and advancedsearch APIs - no key, no ac

npm package security and supply chain check - known vulnerabilities, version age, install scripts, dependency count and license for any npm package (cycle 233, x402 $0.01) - GET ?package=<NAME> OR ?name=<NAME> OR ?packages=<A,B,C> OR ?sample=1|2|3 OR POST application/json {package|name|packages}. KEYLESS OSV.dev advisory database + npm registry + Google deps.dev - no key, no account, no signup, no

Paid Base gas price and chain head (cycle 226 alias path, x402 $0.01) - GET ?sample=1|2|3. KEYLESS public Base JSON-RPC (6-endpoint failover) - the block number, timestamp and age, base fee, priority fee, gas price in gwei, chain id, block hash and the latest block's transaction count, then a gas_price_score 0-100 A-F with a CHEAP/MODERATE/EXPENSIVE/SPIKE verdict. ALIAS PATH of /chain/base-gas-pri

Paid native wallet balance read on Base (cycle 227 alias path, x402 $0.01) - GET ?address=<0xWALLET> OR ?token=<0xTOKEN> OR ?tokens=<A,B,C> OR ?sample=1 OR POST application/json {address|token|tokens}. KEYLESS public Base JSON-RPC (6-endpoint failover) - the native ETH balance in wei and as a formatted amount, the gas balance, the chain id, the block the read was taken at, and the ERC-20 balance o

Paid Base chain head and gas price (cycle 225, x402 $0.01) - GET ?sample=1|2|3 OR POST application/json {}. KEYLESS public Base JSON-RPC -- no key, no account, no signup. Returns the current block number, the block timestamp and age, the base fee, the priority fee, the gas price in gwei, the chain id, the block hash and the transaction count of the latest block, then a gas_price_score 0-100 A-F wi

Paid chain block number read on Base (cycle 227, x402 $0.01) - GET ?sample=1|2|3 OR POST application/json {}. KEYLESS public Base JSON-RPC with 6-endpoint failover - no key, no account, no signup. Returns the current block number, the block timestamp and its age in seconds, the gas used, the transaction count, the base fee, the block hash and the chain id, then a block_freshness_score 0-100 A-F wi

Paid latest block number read on Base (cycle 227 alias path, x402 $0.01) - GET ?sample=1|2|3 OR POST application/json {}. KEYLESS public Base JSON-RPC (6-endpoint failover) - the current block number, its timestamp and age, gas used, transaction count, base fee, block hash and chain id, then a block_freshness_score 0-100 A-F with a FRESH / STALE / LAGGING verdict. ALIAS PATH of /chain/block-number

Paid ERC20 allowance read on Base (cycle 226, x402 $0.01) - GET ?owner=<0xWALLET> AND ?spender=<0xWALLET> OR ?token=<0xTOKEN> OR ?token=USDC OR ?sample=1 OR POST application/json {owner|spender|token}. KEYLESS public Base JSON-RPC with 6-endpoint failover - no key, no account, no signup. Returns the exact-integer allowance, the token decimals, the symbol, the chain id and the block the read was ta

Paid ERC20 allowance read on Base (cycle 226 alias path, x402 $0.01) - GET ?owner=<0xWALLET> AND ?spender=<0xWALLET> OR ?token=<0xTOKEN> OR ?token=USDC OR ?sample=1. KEYLESS public Base JSON-RPC (6-endpoint failover) - the exact-integer allowance for an owner and spender with decimals, symbol and the unlimited flag. ALIAS PATH of /chain/token-allowance, served at the exact slug the winning competi

Paid ERC20 balance read on Base (cycle 226 alias path, x402 $0.01) - GET ?address=<0xWALLET> OR ?token=<0xTOKEN> OR ?token=USDC OR ?sample=1. KEYLESS public Base JSON-RPC (6-endpoint failover) - the raw exact-integer token balance, decimals, symbol, formatted amount, chain id and the block read at. ALIAS PATH of /chain/erc20-balance, served at the exact slug the winning competitor uses so a buyer