x402 Pay-Per-Call APIs for AI Agents
Pay-per-call APIs that use the x402 protocol: the server answers HTTP 402 with payment details, and an agent pays per request, usually in USDC, without an account or API key. Entries come from a public x402 discovery index, and each provider sets its own price.
ip-listed-on-barracuda
Is this IPv4 address listed on barracuda (b.barracudacentral.org)? Performs the DNSBL query (reversed octets under b.barracudacentral.org, via…
Kitchen Pass Chef API
What can I use instead of buttermilk, self-raising flour, creme fraiche or sour cream? Get head chef Cristopher's verified swaps: yes, no or depends…
market.memoryapi.org
Real-time arbitrage spreads between tokenized securities and actual stock prices. Identify premium/discount opportunities.
Japan Stablecoin Payment Monitor
End-to-end smoke test for x402 clients: returns a greeting plus the settlement timestamp, so an agent can prove its payment path works before…
PennyAPI Robots Permission Check
Check robots.txt before crawling or scraping a page. Decide whether GPTBot, ClaudeBot, Googlebot, or another crawler may fetch the exact URL and…
Amazon Product Search API
Amazon product search API - search Amazon products / find products on Amazon by keyword (US). Live Amazon product data: ranked listings with ASIN,…
trade.chainverdict.xyz
Validate an IMO ship identification number check digit.
VoidFeed
Returns verified, citation-backed facts about new AI model releases, benchmark scores, and protocol changes, each with source URLs and confidence.
Agentic Reservations
Restaurant recommendations from the Blackbird network (~2,000 curated restaurants, mostly NYC and San Francisco). Full-text search plus…
api.terradeed.co.uk
Clean, LLM-ready markdown from any URL. JavaScript rendering included. Feed web content directly into agent context without parsing HTML.
assay.cascadiantech.com
Liquidity pools created on Base mainnet in the last 24 hours, newest first, one page per call, filterable by exchange and flag. Each pool carries…
BizIntel API
Fetches 7-day temperature and precipitation forecast charts from Open-Meteo.
JSON Schema Validator
JSON Schema validation — validate JSON records, invoices and payloads against the bounded Draft 2020-12 Atlas profile; return valid status and…
Implied Volatility & Max Pain
Implied volatility (IV) of crypto options per expiry from Deribit, Bybit and OKX: ATM IV, 25-delta skew, put/call open interest ratio, max pain and…
kino402
ElevenLabs TTS: 29 characters, voice 21m00Tcm4TlvDq8ikWAM
mechamanda.com
Search for upcoming concerts. Supports city, date range, genre, and artist filtering.
payload402
npm license triage for coding agents — call immediately before npm install, yarn add, or pnpm add. Returns npm-declared license, SPDX id, and…
pulse.chainverdict.xyz
Fresh probe of your endpoint plus an Ed25519-signed quality attestation (compact JWS, 24h TTL) you can embed in your 402 responses to raise buyer…
risk-graph-gx7v4.ondigitalocean.app
Graph schema definition — entry point for agents to discover available data
TransitPulse
Rail/coach/ferry/cruise compensation eligibility — UK Delay Repay, EU Rail 2021/782 (25/50%), EU/UK ferry 1177/2010, EU coach 181/2011, US FMC…
WealthPulse
Credit-card benefit coverage check — extended warranty, purchase protection, trip delay, cell phone, return protection — against ISSUER-verified…
Extract and classify page links
Fetch a URL and extract every hyperlink on the page, each resolved to an absolute URL and classified as internal vs external (by registrable host),…
Browser Use
Browser Use: AI browser automation agents in the cloud. POST a natural-language task and an agent navigates websites, fills forms, clicks buttons,…
MCP Operation Risk
Analyze operation-level risk inside consolidated MCP tools. Returns evidence-backed ALLOW, DENY, or REQUIRE_APPROVAL decisions, retry semantics,…
SameDayDesk
Extract a public HTTP(S) page into JSON: title, description, JSON-LD, Open Graph, headings, links, and AI-readiness signals. No JavaScript;…
agosint
Business registry lookup: company identity and legal entity enrichment as structured JSON, by registration number, name and country, VAT number, LEI…
anomaly.forgemesh.io
Returns a real-time mempool anomaly score with current gas price vs 20-block median, pending whale swaps, and contract deploy counts. Poll every 5s…
Qonoro Email Validator
Validates email deliverability: syntax check, MX record lookup, and SMTP server reachability. Returns risk score and quality rating. Deterministic,…
Solgiery Random
Base payment check. Returns pong after settlement.
Usenami
Funding rates per venue for one crypto perpetual, or the whole cross-venue set in one call. Major CEX and DEX venues — Binance, Bybit, OKX, Bitget,…
x402ai
Convert text into a 768-dimension embedding vector (nomic-embed-text) for semantic search, RAG retrieval, clustering, deduplication or similarity…
ClinicalIntelPulse
ClinicalTrials.gov lookup, deterministic. Answers "what is the status of NCT02142738", "recruiting phase-3 melanoma trials", "Pfizer trial…
Crypto Data & Market Analysis
AI crypto analyst, pay-per-call in USDC: ask any question on Bitcoin, Ethereum, altcoins or macro; the agent picks live market data tools (prices,…
CryptoPulse
Real-money implied probabilities for macro and sports events from Hyperliquid HIP-4 outcome markets. Answers "what odds does the market put on a Fed…
HALOWERK Energy
Cheapest end-to-end x402 purchase test. Always returns a 402 challenge without payment and the current full NegPrice decision after a valid USDC…
long.events
LONG Events events API: global electronic-music event discovery with structured artists. Actions: discover, list, stats, catalog_stats,…
percallapi.com
Lookup WHOIS records and domain availability in JSON format. Provide the domain name via ?domain=example.com to query registrar, status, and…
StableFinance
Historical OHLCV bars for a US stock. Required: ticker, interval (day|week|month|year), start_date (YYYY-MM-DD), end_date (YYYY-MM-DD).
StableProducts
List Wirecutter review URLs from the public Wirecutter review sitemaps. Defaults to recommendation-like review pages.
VIN Decoder
Decode any 17-character VIN into the vehicle it describes: make, manufacturer, model, year, series, body class, drive type, engine, fuel,…
402registry: AI Crawler Audit
AI crawler visibility audit: is your website visible to AI crawlers (GPTBot, ClaudeBot, PerplexityBot, OAI-SearchBot) so ChatGPT, Claude and…
402sentinel.com
RWA risk gate: score a TOKENIZED ASSET (treasury, stock, credit) BEFORE an agent buys it. POST {target:{payto_address:<token contract>,…
agenttoll.dev
Search USPTO trademark database. Returns mark, owner, filing date, status, registration number, goods/services classes.
IXS
IXS Real world asset vaults — 6% yields, BlackRock exposure, tokenized on-chain
Lending Rate Optimizer
Discover what your assets could earn through lending—and where to find the strongest rates. Compare supported lending markets to find the best rates…
api.doseplot.com
Ranked reconstitution suggestions for one published reconstitutable compound: bacteriostatic-water presets that put the published per-administration…
Dragons Eye Lookup
Dragons Eye Lookup: Ransomware leak-site claim lookup by company name or domain. Returns ransomware-group claims (group, dates, country, sector,…
CapitolFlow
US congressional (Senate+House) stock trades; ?symbol= for a ticker
CitePulse
Single-paper lookup by DOI or title for research agents — citation count, influence, open-access status with a direct legal-OA link (Unpaywall),…
Company Registry Lookup
UK company lookup in the official Companies House register by company number or company name. Returns legal name, company status, company type,…
ContextSlim
[MCP: fetch_result] Targeted JSONPath extraction (query param mode) from cached context reference.
mime-type-for-bin
MIME type for .bin files: application/octet-stream. Returns the Content-Type to send, the category, whether browsers render it inline, whether it is…
domain.hugen.tokyo
WHOIS registration lookup — registrar, creation/expiry/updated dates, domain age in days, name servers, DNSSEC, registrant country/org, EPP status…
Email Auth SPF/DMARC/DKIM Check
Email authentication posture check: parses SPF, DMARC and DKIM plus MX for any domain and grades deliverability/anti-spoofing gaps (SPF +all, SPF…
Product Price Lookup
Product price lookup for AI agents: give any public product page URL, get the product's current price, currency, availability (in stock or not),…
factstamp.agentrails.workers.dev
Check a citation before repeating it. Give a DOI, an arXiv ID or a paper title; the answer says whether the work exists, what it is (title, authors,…
GDELT Global News Intelligence
Global news article search by GDELT — normalized fulltext search across worldwide media (query syntax: phrases, OR, sourcecountry, theme, tone)…
lauf.halowerk.com
Loads a public https page, finds the requested form, fills your values into it in a real headless browser and reports what a submission would run…
LION Verified Company
Is this crypto wallet sanctioned? Instant OFAC SDN address screen for AI agents. Returns PASS/WARN/BLOCK. $0.001 Base USDC, keyless x402.…
lumierepaycheck.org
Score up to 100 x402 endpoints in one call. For teams: per-agent spend limits and an audit trail at lumierepaycheck.org/subscribe.
MarketPulse
TTS-ready voiceover narration script for video ads, explainers, podcast ads, YouTube intros or phone greetings: clean plain-text script sized to…
orchard-data
StockTwits trending symbols right now, with watchlist counts. The other half of retail attention, separate from Reddit. JSON.
presign-guard
Is this transaction, approval or signature safe to sign? Check it before your AI agent or wallet signs it: pre-sign verdict (green/orange/red +…
stable-travel-git-migrate-stabletravel-router-140-merit-systems.vercel.app
Get weather observations (METAR) for a specific airport
Apify API
Start the "💡 Indeed Jobs Scraper" Apify actor (valig/indeed-jobs-scraper). $0.1/1K jobs | Scrape job listings, salaries, and company details from…
store.cryptotradecalc.com
weather-forecast: Current temperature and precipitation for any city (by name or lat/lon), powered by Open-Meteo.
Supplier Payment Decision Agent
Registers an RSA public key (2048-bit or larger, PEM) used to sign payment-decision requests. Keys are immutable per tenant; rotate by registering a…
weather-bazaar-test-production.up.railway.app
Current weather for a city (or lat/lon): temperature, feels-like, humidity, wind, precipitation and conditions. JSON. After your call, please rate…
Text Tools API
Wandelt CSV in JSON oder JSON in CSV um, ohne KI (Convert CSV to JSON or JSON to CSV, deterministic).
Artifact Inspector
JSON Web Token (JWT) decoder — parse an unverified compact JWS header and claims and evaluate advisory NumericDate times without signature…
ChainAnalyzer
Cheap connectivity-check endpoint. Verifies the full x402 settlement path (signature -> CDP facilitator -> on-chain transferWithAuthorization) for…
cleared.ink
Wan Text-to-Video Job (480p)
Coinslot
Check an email address: RFC syntax, live MX records via DNS-over-HTTPS, and disposable-domain screening. POST { email } or { emails: [...] } (max 20).
Agent Desk API: Event Facts
Verified market-moving events for crypto agents: headlines categorized (liquidations, macro, regulation and more) and tagged to BTC/ETH, each with…
ESGPulse
ESG disclosure builder for sustainability-reporting and compliance agents. Returns what to disclose and how to structure it: ESRS data-point…
execbox
Execute code in any supported language. 5s CPU timeout, 128MB RAM. Supports 40+ languages including Python, JavaScript, C, C++, Java, Go, Rust.
FilingsPulse
Eight quarters of a US public company's reported fundamentals, straight from SEC XBRL. Answers "Apple revenue last 8 quarters", "is NVDA net income…
HarvestPulse
Dirty Dozen & Clean Fifteen guide — which produce to buy organic: the EWG pesticide priority list and a smart organic buying strategy. For foodie…
imagegen.coinopai.com
Generate an AI image from a text prompt via FLUX Schnell — fast text-to-image for drafts, mockups, concept art, marketing images, and social…
ChainQuery Bitcoin Intelligence
ChainQuery Bitcoin Intelligence: independent Bitcoin-native on-chain data over x402, no API key. Live mempool fee-pressure signal (state…
jsonrecon.com
Verify Product data against multiple representations on the requested page. Returns field-level corroboration, bounded evidence, contradictions,…
Orcpin
x402 endpoint reliability pre-flight: factual service-delivery measurements of a target x402 endpoint before an agent pays it — reachability/uptime…
Perp Gap API
Gap table for trade.xyz (Hyperliquid HIP-3) stock perps: perp mark/oracle vs live stock price and Solana xStock, basis, hourly and annualized…
presign-guard
Is this token safe to buy, or a honeypot or rug pull? Checks a Solana or EVM token before you buy, hold or accept it (mint or freeze authority still…
RatesPulse
US bond-market signal: yield curve, credit spreads, real yields (no params)
Schedule & Timezone Tools
Timezone converter — resolve civil-time daylight-saving (DST) folds or gaps and convert one local time between IANA zones.
Juniper Agent Web Intelligence
Public sources for agent research: one Brave search plus fetch of up to three public HTTPS pages. Returns structured JSON with page text, metadata,…
Mycelium Finance
Mycelium Market Snapshot — live Mycelium Strategy liquidity allocation plus Solana top-performing tokens, in one JSON call. MYC reward: the first…
Nexari Agent Tools
Transkription bis 10 Min Audio, Whisper large-v3-turbo, Deutsch optimiert, verarbeitet in Deutschland. Speech-to-text for audio up to 10 min (mp3,…
agent-tools-7936.onrender.com
Use before paying any x402 endpoint, so you don't pay a dead or mispriced one: checks it is alive, correctly payment-gated, its price/network/asset,…
AgentCheck
AgentCheck: independent report on an x402 seller before you pay it. Are its buyers real (repeat wallets on their own money) or funded by the seller…
Space Data API
Upcoming SpaceX launches (next 5) with mission, pad, and T-0 details
api.agentic-swarm-marketplace.com
Returns a constitution-safe short-form answer to an agent question with source attribution. Use for lightweight Q&A before purchasing deeper research.
api.paylyte.ai
Recent significant earthquakes from the U.S. Geological Survey, with time, magnitude, and event ID.
api.stakedbots.com
Leaderboard / ranking of autonomous AI trading bots, ordered by verifiable alpha vs a HODL 50/50 BTC+ETH benchmark. Each bot stakes USDC and…
RAVN
RAVN — best-price swap quotes across 20 execution venues and 17 chains, including native (non-wrapped) Bitcoin as either source or destination. 0%…
x402 Spend Cap/Allowance Check
x402 spend cap and allowance check by Liquid Logic X: call it before paying an x402 endpoint. Input: wallet (the Liquid Logic X treasurer,…
CareerPulse
Salary benchmarking for job-seeker and career-coach agents. Returns real compensation data by role, location, and experience level.
CodePulse Agentic API
Audits word conflicts in public trademark indexes to verify name availability.
Darkly Energized
List the computed series x402 serves, with their details ($0.01)