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.
URL Unwrap / Redirect Tracer
Trace an HTTP redirect chain to its final destination without downloading page bodies. Returns every hop (URL + status), the final URL, and safety…
Query string parse / build
Two directions over query strings. action='parse' decodes a query string (with or without a leading '?') into an object, collapsing repeated keys…
apidx UUID Generator
The same UUID generation on the x402 face: the body adds network/asset (base/USDC) as in the reference x402 listing's response.
Contact Verify
Email verification / validate email: checks if an email address is real and deliverable (SMTP mailbox check), flags disposable, catch-all and role…
QR Code & Identicon Generator
QR code generator — encode text, URLs, payment URIs, or arbitrary UTF-8 data as base64-encoded SVG or PNG in a JSON envelope.
vu.velvetdao.xyz
AI wallet portfolio analysis: token balances, PnL, risk metrics.
Address validation
Validate a blockchain address. Supply `chain` to check against a specific chain, or omit it to auto-detect. Ethereum addresses report their EIP-55…
insider-radar-agent
Parsed House/Senate PTR trades: member, ticker, type, amounts, filing lag (last 1000)
willimake-it.dylan-caponi.workers.dev
Ask the oracle: will I make it?
Wintel
Live scored geopolitical threat feed: name, category, severity, coordinates, and source URL for every active tracked threat.
www.securaw.com
CryptoVar risk_asset: single long spot exposure, BTC/ETH/SOL, 90 daily Kraken returns, seeded Monte Carlo VaR and replay artifact. 0.25 USDC.…
Skopos
Live Polymarket odds and volume — by topic, or today's biggest movers if no topic given.
x402-api-24223879872.us-east1.run.app
Validates an 18-digit Mexican CLABE (sent as a JSON body, not a query param): check digit, bank identification (Banxico/SPEI catalog), plaza, and…
Clash of Coins
Low-cost gateway health probe for real x402 settlement checks
HALOWERK x402werk
Checks vouchers of a payment channel by computation only - nothing is ever claimed, redeemed or refunded. Signatures are verified cryptographically…
x402.presenceoperations.com
What it would cost to execute a given notional in a given market right now: size-weighted fill price, slippage from the touch in basis points, and…
TickerLayer
Discover the current TickerLayer Forex symbol catalog. Stock symbols are market-qualified in COUNTRY_OR_MARKET:SYMBOL form such as US:AAPL.
YouTube Transcript & Captions
Full transcript of any YouTube video by video id or URL: captions/subtitles as clean plain text plus timestamped segments, the video's chapter…
ZeroWorker Web Action API
Avoid unnecessary browser launches with a lightweight preflight for AI agents. ZeroWorker inspects public pages before browser automation and…
21millionpixels.art
Paint one pixel on 21millionpixels.art, a shared 21,000,000-pixel canvas. Reads are free; paid pixels skip the human cooldown.
402cron: Scheduled Webhooks
Cron job scheduler for AI agents: calls your HTTPS endpoint on a cron expression (recurring webhook, scheduled callback, heartbeat, reminder). ENTRY…
CORE HTML SEO Analyzer
Analyze raw HTML you provide and get structured SEO data as JSON: title, meta description, canonical, H1-H6 outline, links, JSON-LD blocks and…
Aegis Curated Briefing
Aegis curated briefing — AI-scored content feed with V/C/L metrics
AfricaPulse
Africa regional macro + geopolitical stress pulse (no params)
SAVER Verifier
Paid verification layer for autonomous AI agents. Verify claims before decisions using web evidence and source-backed analysis
agentdatafeed
EU funding calls and grants: Use when a user asks which EU grants, subsidies or Horizon Europe calls are open or coming up for a topic, sector or…
agentic-x402.ai
Allooloo Capital Markets estate index for $0.01 USDC: every market node (Canada, United Kingdom, United States, Germany, France, Netherlands,…
agents.factstamp.dev
Verify whether a legal entity exists and is currently registered, from open primary registers: the GLEIF LEI index, US SEC EDGAR and the Australian…
AgentOracle
AgentOracle: live service-health snapshot — tracked-token count, last ingestion timestamp, ingestion error counter, process uptime, and API version.…
ANIME INTELLIGENCE
Estimate scarcity and rerelease/replenishment risk for the exact Japanese collectible, not just the franchise. Combines matched supply, price…
api.decadata.io
Year-on-year growth in point-of-sale sales and units for one of ~380 US consumer companies, by ISIN or ticker, for $0.01: the company's latest…
60SecMonitor Status API
60SecMonitor Status API: Current outage status for a vendor (60SecMonitor). Current status, active-incident summary, last-checked time and source…
Japan Postal Lookup
Japanese postal-code lookup and reverse lookup. Keywords: Japanese postal lookup, Japan Post postal code, postal code reverse lookup, 日本郵便番号検索. Use…
lokalapi
Resolve an official Indonesian region code (Kemendagri 2025, e.g. '34.71' or '34.04.12.2001') to its name, type and full administrative hierarchy.
n0brains
Real-time crypto trading signals for BTC, ETH, SOL and 400+ coins — classified by type (whale flows, funding, liquidations, listings, news,…
api.phoneagent.xyz
PhoneAgent — countries with rentable SMS phone numbers for AI agents. Returns 190+ supported countries, each with the number of services offered and…
Trust Index
SpookFiles — already-public records. Doc ID + snippet + URL. WikiLeaks is not NARA.
api.stacktr.ee
Stacktree: host generated HTML as a live, shareable web page on a permanent, private, unguessable link ($0.50). POST any HTML (a report, dashboard,…
vrsai
Check an exact npm or PyPI package version immediately before installation using current registry, vulnerability, malicious-package,…
api.xona-agent.com
ElevenLabs text-to-speech: convert text to speech (MP3) (Base Mainnet).
api.ysaere.com
Ysaere Agent Hash Stamp — $0.02 USDC, no account needed. Returns a signed hash_only receipt and verify_url. Free GET resolve and proof. Integrity,…
app.heinrichstech.com
BitBooth echo endpoint — pays a tiny USDC fee, returns a JSON echo. Reference implementation of the x402 + CDP Facilitator + Bazaar discovery loop.
bunnvault.xyz
BunnVault: Real-time Aave v3 USDC APY feed on Base Mainnet
ClearCarePulse
Citation-locked medical-bill letter: No Surprises Act balance-bill dispute, health-plan internal appeal, hospital financial-assistance cover letter,…
clearcut.clawca.sh
Remove the background from an image URL and return a hosted transparent PNG URL. Paid responses include a feedback_id. Please rate the result for…
The Clinic
Mid-task, and nothing said to you will be kept? One line of encouragement, plus an id you can quote back to us later. Unsigned: nobody but us can…
Combinations (nCr)
Binomial coefficient nCr = n!/(r!(n-r)!), the number of unordered r-subsets of n. Requires r ≤ n and min(r, n-r) ≤ 10000.
ConsumerPulse
US consumer-demand signal (retail sales)
US CPI Data & Inflation Report
Gives you official United States inflation numbers from the government's BLS Consumer Price Index. Ask for the newest reading, a specific month in…
darrylbots.com
Darrylbots paid research: Standard Stock Screen: Quality, Momentum, and Durable Execution
datoka-agent.bhazarstudio.workers.dev
Datoka Agent: one signed execution declaration receipt. Retry with the same event, idempotency key and payment.
dev.gavedu.com
ETH market regime signal (TREND-UP/TREND-DOWN/RANGE/CHOP) from EMA10/30 gap+slope+RSI over Coinbase hourly closes — the exact classifier gating our…
device-clearance-verify.iykykblog.workers.dev
Verify whether a medical device holds an FDA 510(k) clearance. Returns cleared/not-cleared verdict with K number, device name, applicant, decision…
Dicta Realtime STT
Transcribe short audio fast: POST JSON with an audio_url (voicemail, call recording, voice memo, podcast clip — up to 15 min) and get Gemini-powered…
Earthquake Intelligence
Recent earthquakes — search newest-first USGS seismic events by rolling time window and minimum magnitude, with revision, freshness, and provenance.
Email Verifier & Validator
Takes one email address and tells you whether it can actually receive mail. Returns a verdict of valid, invalid, or risky, splits the address into…
EmailIQ
Agent intents: verify signup email · is disposable? · check DMARC before outreach · role-account risk. One call returns syntax, MX, SPF, DKIM,…
ApiToll Multi-Chain EVM Gas
Multi-chain EVM gas price oracle for AI agents — 17 chains (Ethereum, Base, Arbitrum, Optimism, Polygon, BNB, Avalanche…). One x402 call returns…
exhibit402.dylan-caponi.workers.dev
Re-verify any exhibit402 proof-of-publication certificate for $0.02. Pass id = ERC-721 token id, Arweave tx id, or job id. The service re-downloads…
FanPulse
Fan collectibles market intelligence for collector and fan agents. Returns pricing, authentication, and where to buy or sell vinyl, K-pop…
fetchgate.dev
Fetch a URL server-side and return structured metadata.
fetchharbor.benlab.download
Convert a supplied HTML string into deterministic, LLM-ready Markdown. Preserves headings, links, lists, emphasis, and code without fetching a URL…
finanz.halowerk.com
Returns the current fee rates for the usual confirmation targets together with the state of the mempool behind them, and then does the part that is…
FitPulse
Race training plan / marathon & 5K prep by race date: build a plan backwards from event day. Returns periodization, weekly mileage, taper, and…
fresh-feeds
Live x402 services feed: the discovery catalog's active edge, deduplicated and liveness-probed — know a service is up and correctly demanding…
FR Company Search
Find a French company's SIREN from its name (optionally a postal code): up to 5 best matches with status, city, NAF, headcount and creation date.…
Geographic DNS Lookup
Geo-located DNS resolution — resolve hostnames from specific countries to see how CDNs, geo-blocking, and DNS-based routing differ by region.
IP Geolocation Lookup
Resolve any public IPv4/IPv6 address (or hostname) to geolocation for analytics, fraud, and ops agents. Returns ISO country code, region, city, IANA…
Point distance
Euclidean, Manhattan and Chebyshev distance between two 2-D points.
helprentdanang.com
Long-term rental listings in Da Nang, Vietnam: search by district, property type, bedrooms and monthly price in VND. Use when an agent needs current…
HomePulse
Smart home device recommendations and ecosystem advice for any country: Matter compatibility, ecosystem fit (Alexa, Google Home, Apple HomeKit),…
IP Intel
Inspect one IP address for network ownership, location and abuse signals.
LatAmPulse
Full LatAm economic report — currencies, Argentina dolar blue, commodities, AI narrative
Digital Lemonade Stand
A vegan lemonade: lemons, water and ice, served as an illustrated collectible card: a 400x560 SVG image of a cold glass of lemonade with a straw.…
ClearCheck
Federal disaster declarations for a US state or county: what is open now, incident types, and how recent.
Machine Market Social
Fetch a current public creator profile.
manyfish-seller.redcliff-d7368db1.westus2.azurecontainerapps.io
Try with $0.050 in free shared credit once per wallet. No deposit or on-chain transaction; wallet sign-in required. Credit, daily budget and…
Determinant
Compute the determinant of a square matrix via Gaussian elimination with partial pivoting. A non-square, ragged or empty matrix is a clean 400; a…
mcpfax-intel.bowling-anthony.workers.dev
x402 services first listed since a given date, with first archive observation and early-traction evidence from observed inflow. Entrants MCPFax can…
IndustrialMetals
Industrial metals prices with momentum signals, category analysis, and AI brief
monitor.memoryapi.org
x402 API activity stats — top endpoints by paid calls, trend data, and unique payer counts from memoryapi.org nginx logs.
mru-oracle.com
MUR exchange rates (Bank of Mauritius): Bank of Mauritius consolidated indicative rupee exchange rates for GBP, USD, EUR and JPY (per 100), with…
NewsSentiment
AI-powered news sentiment analysis for any ticker company or market topic
Obol
Base network block status reconciled after payment across two pre-probed distinct-operator RPC endpoints
observer.137-184-67-179.sslip.io
Live Bitcoin BTC-USD market-regime and risk evidence for autonomous AI agents, algorithmic systems, portfolio monitors, and quantitative workflows.…
PetPulse
Dog and cat behavior and training guide for pet-owner and trainer agents. Returns force-free, positive-reinforcement step-by-step guidance for…
prospect-intelligence.prospectintel.workers.dev
Basic company lookup. Give a company name and/or domain. Returns summary plus firmographics: industry, HQ city/country, founded year, employee count…
Base USDC lending APY
Base USDC lending APY. Live USDC lending yield on Base, read on-chain: Aave V3 USDC vs Morpho Gauntlet USDC Prime. Size-aware pick for parking idle…
reel24-web-792007954609.us-central1.run.app
Reel24: commission one 4-shot AI episode (~32 s) for up to $9.99, charged only when the finished film passes QA — except on Solana and Algorand,…
Token Preflight
Token Preflight: pre-trade safety check for a Base ERC-20 (buy/sell simulation, taxes, owner powers, liquidity, LP, holders, verification) with a…
spa-dom-to-md.jannioura.workers.dev
Renders JavaScript-heavy SPA pages in real headless Chromium via Cloudflare Browser Rendering, waits for network-idle / selector-ready, strips…
SatsSignal
Recent material public-source changes for tracked Bitcoin services.
Descriptive summary
Full descriptive summary of a numeric sample: count, sum, min/max/range, mean, median, mode(s), variance, standard deviation and the quartiles…
svg-bar-chart-renderer.jannioura.workers.dev
Deterministic, paid-per-render SVG bar chart generator for LLM agents. Accepts labeled scalar data and layout options, performs exact geometry math…
trust.nsgoods.org
Cross-chain ERC-8004 trust score for one (chain, agent) pair — signed JSON with transparent component breakdown (value_avg / client_breadth / volume…
Agent Output Verifier
Free during launch. Independent verification of AI agent output before you pay: an invoice or deliverable against your JSON Schema and rules.…
VIA API Compare
Compare APIs and software services. Returns one recommendation plus up to three alternatives.
vin-verify.iykykblog.workers.dev
Decode a 17-character VIN: ISO 3779 structural validation (check digit), WMI manufacturer lookup, model year, and NHTSA vPIC pattern decode (make,…
Mekler: CSV validation
Validate CSV before import using a fixed JSON column specification. Checks missing/extra columns, required cells,…
wasm-geotiff-transcoder.jannioura.workers.dev
Decodes a GeoTIFF/COG (https URL or inline base64), reads the selected RGB bands via windowed overview reads, applies a tone-map stretch, and…