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.
doaj-article-search.hergertsynthora.com
Searches the Directory of Open Access Journals article index, returning titles, authors, DOIs, journal, ISSNs, abstracts and open-access full-text…
Eagle Eye
Eagle Eye v1.0.0 — U.S. enterprise-grade wallet compliance screening. OFAC SDN + Circle USDC blacklist on Base. Signed audit receipts. Certified…
econ.memoryapi.org
U.S. County Business Patterns — number of businesses, employees, and payroll by industry (NAICS) and state.
Parse a DKIM key record
Parse a DKIM public-key DNS TXT record ("v=DKIM1; k=rsa; p=…") into its key type, public key, hash algorithms, service types and flags. An empty `p`…
GEDX402 Knowledge
Classify sentiment (positive/negative) with DistilBERT. POST text; returns label and confidence score. Fixed low per-request price.
Country flag emoji
Build the flag emoji for an ISO 3166-1 alpha-2 country code from its regional-indicator symbols (e.g. "US" → 🇺🇸). Non two-letter codes are clean 400s.
Web Evidence
Retrieve deterministic evidence from a public HTTPS page
Currency Exchange Rate
Get current exchange rate between two currencies using ECB data. Supports all major currencies. Returns rate, inverse rate, and date.
Locus x402 Services
Locus public pay-per-use API
FishPulse
Real-time fishing & outdoor conditions scored 0-100. Water temp, tide, wind, species intel.
food-hygiene-verify.iykykblog.workers.dev
Verify a UK food business's official Food Hygiene Rating (FHRS 0-5) by name, with optional postcode. Returns the rating in text, the…
formd-offering-verify.iykykblog.workers.dev
SEC Form D private-placement check by issuer name or CIK: has the issuer filed Form D, and for each filing the exemptions claimed (Rule…
Fortune Demo
Random fortune — fixed price, x402 exact
fuelscout.scalpstream.com
FuelScout cheapest-fuel query (station-level where open data exists, regional averages otherwise)
gamemaxxing.baes.so
Search GAMEMAXXING's video games and gaming knowledge base for game concepts across game design, game business, game culture, and gaming history,…
gate-network.matsutake-lab.workers.dev
Twilio SMS and messaging send preflight. Validate a Twilio Messages.create payload before sending SMS/MMS or other supported messages. Returns…
gateway-wallet-payments.jerryrnapier.workers.dev
One-page objective website metadata check; no AI analysis. Asynchronous durable receipt; retain private capability and poll the result URL.
gateway.drillr.ai
Paragraph-cited semantic search over indexed SEC filings
gibbr.app
Translation tuned for skilled-trade work: HVAC, refrigeration, electrical and construction terms stay correct instead of collapsing into a generic…
Locus x402 Services
Locus public pay-per-use API
Hashing, HMAC & Checksum Suite
Give this API any text or binary data and it returns its fingerprint under whichever hash algorithms you choose - SHA-256, SHA-512, MD5, BLAKE2,…
hmo.payapi.market
UK HMO licence full details by licence number. Returns licensee, conditions, occupancy limits, and expiry.
List holidays
List a country's holidays for a calendar year (optionally by state/region, language and type).
HTTP Status Code Checker
Give this API a list of up to 10 web addresses and it will visit each one to tell you whether it is working, broken, or redirecting visitors…
Singularize
Return the singular form of an English word (handles irregulars — people → person, mice → mouse).
Instagram Profile & Posts
Full Instagram profile by username — bio, follower and following counts, posts count, verified and business account flags, category, contact email,…
ireland-charity-verify.iykykblog.workers.dev
Verify an Irish charity against the Charities Regulator Register of Charities. Look up by Registered Charity Number (RCN) or name; returns…
Irish Planning Search
Search planning applications anywhere in Ireland (all councils) by area name OR around a map point. Filter by outcome (granted/refused/pending),…
Israel Company Changes
Monitor recent official Israeli company-registry changes for an exact nine-digit company number. Returns filing and status-change events newest…
GEDX402 Jobs
Submit an async browser job (screenshot, markdown, scrape, etc.). Returns job_id + poll_url; poll is free with token — no long x402 request hold.…
RQM Compare Planned Observed...
Problem: Compare planned and observed trajectories against caller tolerances. Input: JSON with planned, observed, rules. Result: typed verdict,…
jp-cm-kg.ai
One paid call on jp-cm-kg.ai for $0.01 USDC: the surface's own statement of record (a market node: its list_nodes line; a product: its record of…
JSON Validate, Repair, Convert,
Every agent and developer hits broken or confusing JSON. This tool handles the common headaches in one place: check whether JSON is valid with the…
Locus x402 Services
Locus public pay-per-use API
Latitude 10
Meridian: a design system for SaaS products people use all day: admin consoles, CRMs and internal tools. Calm, neutral and precise: Manrope…
Global Law Search
Global law search across JP/US/UK/EU legislation databases (e-Gov, eCFR, legislation.gov.uk, EUR-Lex). Structured JSON results with statute…
Leetspeak Translator
Takes a piece of text and either turns it into leetspeak (swapping some letters for numbers and symbols, like 'hello' becoming 'h3110') or turns…
LensaOCR
Reads an image's text and word boxes (Tesseract txt, TSV, hOCR and ALTO).
longwatch
This-session snapshot only — no watch, no cursor. Use when you will not come back. Required by type: url/rss/x402 need url; price needs coin plus…
machinemint-native-x402-production.up.railway.app
Check an unsigned Base mainnet transaction before signing or broadcasting. Simulates with eth_call, estimates gas, checks sender balance and target…
marketplace-price-api-production.up.railway.app
Search TCGPlayer for trading card prices (Pokemon, Magic, Yu-Gi-Oh, etc.) by card name. Returns matching cards with market prices as JSON.
List expression variables
Parse an expression and return the free variables it references, without evaluating it — so an agent can discover which inputs a formula needs…
Lookup MIME type
Resolve a filename, path or extension to its MIME type, charset and full Content-Type.
mizan-bazar.higgsfield.app
Mizan report card for any of 3,035 x402 operators (47,302 endpoints on file) — this call: api.loyalspark.online. Liveness across surveys, latency,…
mocks-api-production.up.railway.app
Deterministic synthetic JSON or WireMock fixtures for ten commercial and four government APIs. Selected operations and realistic success/error…
Mortgage & Loan Amortization Cal
Give this API a loan amount, an interest rate, and a repayment term, and it returns the exact monthly payment plus a full month-by-month schedule:…
nodeproxy
Distributed lock / idempotency primitive for multi-agent swarms. claim(key) returns a token if free (with TTL); release(token) frees it; check(key)…
nonprofit-verify.iykykblog.workers.dev
Verify a US nonprofit by EIN: tax-exempt status, legal name, ruling date, deductibility code, NTEE activity code, and automatic-revocation flag.…
nova-retail-controlled-proof.onrender.com
Nova retail state_ping context resource
nyc-license-verify.iykykblog.workers.dev
Verify an NYC Department of Consumer and Worker Protection (DCWP) business license by license number or business name. Returns license status,…
oc-person-c.nvprotas.name
Ratatouille demo hello world: returns a greeting and a timestamp.
oratio-api-production.up.railway.app
Find cited Latin or English prayers and historical liturgical source excerpts from Divinum Officium by occasion, language and liturgy, using…
Verify a TOTP code
Verify a submitted TOTP code against a base32 secret, scanning ±window time steps (default ±1) to tolerate clock drift. Returns valid plus the…
OutcomeScout
Turn a news headline into the matching Polymarket prediction markets to trade. One call returns the top markets ranked by relevance, each with live…
Decode MessagePack/CBOR to JSON
Decode a MessagePack or CBOR byte stream (supplied as a base64/base64url/hex string) back into a JSON value. A malformed envelope, malformed bytes,…
page.fluidrack.com
Publish ephemeral page
Academic Paper Lookup
Scientific paper lookup by DOI, arXiv id or PMID: full abstract, Semantic Scholar TLDR, ready-to-paste BibTeX and APA citations, citation counts,…
Pay Per Demo
Pay once for virtual admission to Agentic Commerce Demo Day
paysafe-agent.com
Payment security firewall scan for an OUTGOING x402 payment: PII/secret leak detection in payment metadata, nonce replay detection, overpayment…
pegproof.com
Current summary row for one Robinhood tokenized-stock token: total supply, treasury balance, multiplier, and whether the queried address is a known…
pkgpulse
Rank up to 5 alternative npm packages and get a recommendation with the gap quantified: full disclosed-rubric health report per package, close calls…
proof.platoskallipolis.com
Before an AI agent trusts or pays a public API, inspect its public machine-readable evidence and x402 readiness. Submit a public HTTPS domain to…
publish.sornkan.com
Render any public URL in a real browser (Chromium): markdown text plus screenshot and evidence URLs. $0.005 USDC on Base per call.
QR Code Generator
Generate scannable QR codes from any text, URL, or structured payload (WiFi, vCard, SMS, email, geo, crypto). Returns PNG by default with JPG, WebP,…
reader-api-production-bde1.up.railway.app
Extract a readable article from supplied HTML, including title, author, language, metadata, clean Markdown, links and tables. Uses Mozilla…
red-breeze-8b8c.keenanbooker83.workers.dev
Verify whether a cited source supports an exact factual claim
research.appliedidentities.com
Three composite AI readiness scores with history
NetIntel Router
Is this x402 endpoint working right now? Give one endpoint URL from the Coinbase Bazaar catalog; get a live payment-challenge check, its current…
runmydata.com
DryScout01 Hello by RunMyData: paid x402 connectivity check on Base mainnet ($0.001 USDC). Returns {"status":"ok"}.
Secret Chat for the Chosen
Entry to the Secret Chat for the Chosen for 24 hours
Sato Hub
Daily Sato Score history for one Sato Hub listing: score, tier components, GitHub stars, status and verification state per day, with the dates the…
nsgoods AI Extractability Score
Signed extractability score (0-100) + breakdown + fixes for a URL. Free preview: GET /extractability/preview Blocked or bad input returns 400; a…
Scout Deep
Deeper public web research with exact quotes, source hashes, conflicts, and a propose-only receipt.
Search Aggregator
Search Aggregator deep tier: Serper+Tavily+Exa+Firecrawl merged results with full page content and synthesized answer, fixed price $0.05 USDC. POST…
GEDX402 Search
Tavily web search — POST { query, max_results?: 5 } on search.gedx402.com; ranked results via Tavily API. $0.042 USDC per request. AM-winning shape…
SearchPulse
Grounded web search: question → answer + citations, powered by Bedrock Web Search.
sendcheck
SendCheck: pre-send verification of any EVM address on one chain (EIP-55 checksum, wallet-vs-contract, outgoing activity, balances, verdict). POST…
sftunes.com
SFtunes catalog for agents: index of public mixtapes and public Top 10 lists, or one item with liner notes and music-service links via ?id=<uuid>…
sg-cm-kg.ai
One paid call on sg-cm-kg.ai for $0.01 USDC: the surface's own statement of record (a market node: its list_nodes line; a product: its record of…
shared-hold-api.onrender.com
Store payload to Shared Hold boundary - 0.005 USDC per successful hold
SparkPulse
Wholesale US electricity-market price + volatility signal (no params)
srv1553682.hstgr.cloud
Crypto Fear & Greed index: current value and classification plus 7-day history. Always-on, self-healing, verified onchain settlement. Source:…
StableEnrich
Exa Search - Neural search across the web
stable-media-git-ben-upgrade-agentcash-rou-02e093-merit-systems.vercel.app
List every supported country with its streaming services
staging.toolkit.dev
Add a new memory. This method is called every time the user informs anything about themselves, their preferences, or anything that has any relevant…
staking.halowerk.com
Collateral Correlation Risk analyses only the evidence supplied by the caller. It does not claim to query a chain, identify a legal status or…
StatEdge
StatEdge referee analysis — official tendencies, foul rates, pace impact, and betting implications
Subnano
Read paid Subnano research and analysis as JSON with Markdown content.
supplier-risk-api-production.up.railway.app
Website abandonment check for a company domain. Fetches the homepage now and says why it is or isn't serving: hosting billing lapsed (Vercel,…
adctx
Is this x402 seller actually paid? Give a payTo address, get its verdict from our own read of Base: paid, single-payer, self-funded, dust-only or…
tensegrity-control-mesh.onrender.com
Deterministic structural failure inspection of a caller-declared control mesh. Structural evidence only; never authorizes execution. 0.01 USDC per…
Inspect SSL/TLS certificate
Open an SSL/TLS connection to a host and report its certificate — issuer, subject, validity window, days remaining, SANs, fingerprint and trust…
tollbooth-hello.sjwilliams8.workers.dev
Test endpoint for verifying x402 payment integration end to end. Returns a static greeting in the Agent Tollbooth standard response envelope. Not a…
Rigoblock
Rigoblock DeFi tool discovery. Returns the full catalog with JSON schemas, categories, and access requirements for all direct-invocation tools.
URL Uptime Checker
Checks whether a website or web address is currently reachable and reports how fast it responded.
Website technology stack lookup
Detect the technology stack a website runs on. Given a domain, returns the software and services it uses (CDN, analytics, frameworks, CMS, payment,…
us-agentic.com
Fetch a public URL and return clean LLM-ready markdown from static HTML.
verify.clearsigned.com
Clearsigned — the trust layer with no stake in the outcome. Submit {claim, evidence[]}, receive an Ed25519-SIGNED, evidence-bearing receipt (verify…
WalletIntel
Crypto wallet intelligence — risk scoring, sanctions screening, chain analysis, and narrative reports for any wallet address.
Content Classifier Agent
Classify text or JSON into categories with AI: sentiment analysis, topic, intent detection, urgency triage, or a custom taxonomy. Returns labels…