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.
stable.halowerk.com
Onchain Collateral Attestation analyses only the evidence supplied by the caller. It does not claim to query a chain, identify a legal status or…
StableCrypto
List all stablecoins with mcap and peg data
tariffmonkee.com
Health and payment-path check. Returns server time and a confirmation that your x402 payment settled. Cheapest endpoint in the catalog; use it to…
the-stall.intuitek.ai
Earnings calendar for upcoming US stock reports — earnings date, EPS estimate, pre/post-market timing. Filter by ticker for per-company lookups, or…
Parse timecode
Parse an SMPTE timecode (HH:MM:SS:FF, or HH:MM:SS;FF for drop-frame) at a given frame rate into its components, total frame count and real-time…
toolbelt402.tpoborne.workers.dev
Validate JSON data against a JSON Schema (draft-07, 2019-09, 2020-12) — returns exact error locations, keywords, and messages for programmatic…
Japan Business Calendar
Tell whether a given date is a Japanese business day. Japanese national holidays and business-day calculations derived from the Cabinet Office…
TraBot Pearl Intel
Hero SKU: Pearl Research L1 telemetry (pearld RPC, community nodes, poll history). Free trial: GET /api/a2a/pearl/status
El Nino Market Watch
Latest ENSO index bundle from El Niño Market Watch: weekly Niño 1+2/3/3.4/4 SST anomalies (NOAA CPC), RONI, Troup SOI (BOM) and weekly IOD/DMI —…
TrapCheck
Crypto token risk brief: price action, liquidity, supply dilution, and red flags, summarized in plain English.
travel.forgemesh.io
Fare Pulse — cheapest live fares from a major US hub, cached snapshot.
Trust Check
Is this address safe to send funds to on Base? Checks scam blacklists, address poisoning (look-alikes of your recent counterparties via ?from=),…
List units
List the supported units and their metadata (abbreviation, measure, system, singular/plural names), optionally filtered to a single measure — a…
vealth.net
Work tCO2e Accounting (CDP-settled mirror) — ecological accounting guidance from the production settle-to-retire mapping for a work type. NOT a…
Vedetta
Recent analyst desk posts as a stream (?since_id=&asset=&limit=): cached, instant, half a cent. Poll it cheaply; escalate to a live read when…
vmi1759441.contaboserver.net
Create an about 15-second UGC-style product ad from a product image and details. Pay once via x402, then poll statusUrl for the MP4 download.
webschutz.halowerk.com
No accidental wildcard CORS evidence record fetches current public evidence from the supplied target and evaluates the documented criterion. It…
webtechnik.halowerk.com
Parser-blocking script budget repair plan fetches current public evidence from the supplied target and evaluates the documented criterion. It…
Weather Ensemble
Single models are everywhere. This is the disagreement between them: per hour a median with a p15/p85 band, the full min/max spread, how many models…
wtsp.dev
Whether a number has a WhatsApp account, and nothing else: the cheapest way to clean a list before paying for profiles. /v1/profile gives the same…
CelerAPI
Search authoritative company registries by company name to resolve candidate legal entities and registration identifiers. Currently supports the…
ContentRewardsAI
Queue a production video render at $0.10/min USDC (billed by the second, rounded to $0.001). Same Edit JSON as staging…
www.moltbillboard.com
Browse live MoltBillboard placements — machine-readable offer surfaces, trust signals, and attribution primitives for agentic commerce.
Re:TCG Appraise
Pokémon card appraisals, $0.02 a call in USDC on Arc, Base, Polygon or Solana. Raw and every PSA/BGS/CGC/SGC grade in 9 currencies, each with…
www.robbiegeorgephotography.com
Atomic canonical resolution for the registered Robbie George Biography Plate™ identifier. x402 payment grants one endpoint-level retrieval only. It…
Vokko
Can an agent pay at mercadolibre.com.ar? Rails, endpoint, price, freshness. $0.001. Cached report stays free at /api/v1/hosts/mercadolibre.com.ar.
Kansai ADS-B Live API
Live aircraft positions over Kansai / western Japan from an independent ADS-B receiver (~1s freshness): position, altitude, speed, squawk, plus…
Market Quote Snapshot
Real-time US stock & crypto price snapshots with 24h change, 52-week highs/lows and data source. Use when an agent needs current market prices for a…
threat-feed
Live feed of freshly-detected malicious addresses on Base — address-poisoning seeders caught via zero-value transfer sprays, updated continuously by…
x402-web-extract.senpi-agent.workers.dev
Fetch any public URL and return a clean, readable markdown or JSON extract for AI agents. Pass the target as ?url=<encoded>. Ideal when you need to…
Laso Finance
Get a Firebase ID token for authenticating with the callable APIs
Affiliate.com
List the merchants behind the catalog. Filter by name or domain search, by country, or by product count, and page through the results.
agent-domain-trust.iykykblog.workers.dev
Assess the trustworthiness of a domain: RDAP registration age and registrar, DNS records (A/MX/TXT-SPF), and HTTPS reachability. Returns a 0-100…
agent-embassy.fly.dev
Verify a web claim and get a signed, re-checkable Outcome Receipt — machine-verifiable proof of delivery for agent commerce. The Embassy fetches…
Agent Guild
Agent Guild paid read (fraud_check): collusion suspicion scores, reasons and cluster identifiers Use when an autonomous agent needs to: list agents…
Easy Reader AI
Fetch a public web page and return only its metadata: title, description, canonical URL, language, site name, author, publish date, image and JSON-LD.
agent-robotics-compliance.iykykblog.workers.dev
Check a robot maker's compliance history: OSHA robot-involved incident data plus FDA device recall (enforcement) history for the maker. Returns…
agent-sec-lookup.iykykblog.workers.dev
Look up SEC EDGAR company information by ticker, CIK, or company name. Returns company profile and recent filings.
KARP by SoulDriver
Research cards from KARP, SoulDriver's multi-model research engine: GPT, Gemini, Grok and Claude debate a topic over many rounds and publish a…
Nearest airports to coordinates
Find the airports nearest to a latitude/longitude, ordered by great-circle distance. Optionally cap the search radius (km), result count and airport…
AgentLine - AI Phone Service
AgentLine gives AI agents real US phone numbers, inbound/outbound voice calls, AI receptionists, transcripts, inbound SMS and live phone events. Use…
ASI Agent Search Index
Web search for AI agents over ASI's own crawled English index: title, URL, snippet, source, date and score as JSON.
Block402
Ethereum read-only RPC and supported simulations. Submit method and params as JSON. Method schemas, limits and prices:…
api.carvector.io
CarVector vehicle data — single API call
Claw-in-a-Box
Spend-policy verdict for AI agents: POST a proposed spend, get allow/review/deny with the exact rules that fired (per-tx caps, per-agent daily…
Emboss
Fill a PDF form from structured data such as JSON or key-value answers. Also: fill a PDF form from JSON; populate form fields from data; complete a…
GridHub Electricity Data
Most recent value of every metric one electricity zone publishes (wholesale price, demand, interchange; generation mix for GB and US-CAISO; carbon…
InboxGuards Email Test
InboxGuards Email Test: Email address check: syntax, MX, disposable and role account (no SMTP probe). Checks one address without sending mail: RFC…
api.influship.com
Live YouTube scraping
api.kgninja.dev
KG-NINJA Agent Error Fix Receipt
MoltGuard
Wallet risk score 0-100 with component breakdown for an EVM address.
Polyform
Recent IPs caught probing Polyform's honeypot paths (credential/vuln scanners) — Polyform's own first-party telemetry, not a repackaged public list.…
api.satledger.org
A satledger workspace and the units of recording you pay for, from 0.50 upward. One unit is one recorded event; an anchor costs 100. Exports and…
Python Code Validator
Check Python for syntax errors, lint and type mistakes, unsafe constructs and hardcoded credentials, and against the examples the caller supplies,…
api.sys84.org
Discover active Base tokens ranked by momentum, liquidity, and volume. Returns machine-readable market metrics plus report freshness and follow-up…
x402receipts
Accounting, reconciliation and audit trail for autonomous agent spending. Every x402 purchase becomes a receipt matched against the on-chain USDC…
AsiaPulse
Asia regional macro + geopolitical stress pulse (no params)
ASN Lookup
Given an internet address (IP) or a network identification number (ASN), this tool returns who operates that piece of the internet: the network…
aurelius-node-02-socal.onrender.com
Aurelius Node 02: Real-time SoCal Pacific Gateway ground-truth oracle for cross-referential supply chain AI agents. Serves a live, actively updated…
Infoharmoni Radar who
Is this x402 seller real? One seller's report card before you pay them: what they sell, price, rank of all sellers, rivals, and from the chain who…
Locus x402 Services
Locus public pay-per-use API
BIMI Checker
Checks one or more domains to see whether they are set up to show a brand logo next to emails in Gmail, Apple Mail, and Yahoo. It looks up the BIMI…
bridge-condition-screen.iykykblog.workers.dev
Bridge condition and clearance verdict from the FHWA National Bridge Inventory: component condition ratings…
Molar mass
Compute the molar mass (g/mol) of a chemical formula. Supports nested parentheses and brackets, element multipliers, and hydrate dot notation with…
companylens.ve1iko.chatgpt.site
Resolve a UK legal company name or registration number to a sourced Companies House profile. Returns company status, incorporation, SIC codes,…
cron402-api.user-defaults.workers.dev
cron402: create a cron job that calls your webhook on a schedule. $0.008 includes 1 run credit; each subsequent run costs 1 credit (top up at…
AUTOGROK Desk
Call when you need a researched written brief on a topic (not instant). Delivered within 24h, usually same day: ~500 words default (max_words…
Antonyms of a word (opposites)
Return the antonyms (opposites) of an English word, aggregated across all its senses. Optionally filter by part of speech. An unknown word returns…
Student's t distribution
Student's t distribution with df degrees of freedom (> 0). `function` selects the density (pdf), cumulative distribution (cdf) or quantile /…
Bulk DMARC Record Lookup
Give this tool a list of domain names and it will instantly check each one's DMARC email security record. DMARC is a standard that tells email…
Domain Age Checker
Send a list of domain names and this tool tells you exactly how old each one is, when it was first registered, when it expires, and how much time is…
Domain Availability Checker
Give this API up to 10 domain names and it tells you whether each has a registration record at the official registry. It uses RDAP, the structured…
drug-shortage-check.iykykblog.workers.dev
Check whether a drug is currently in shortage in the FDA Drug Shortages Database, by generic/brand name or NDC. Returns the FDA status (Currently in…
energybilltoolkit.co.uk
Place Distance tool: Search for places by name — returns coordinates, population, country, and admin region.
ENS Resolver
Look up an ENS name or an Ethereum address and get back the matching one, automatically figuring out which direction you need.
EuropePulse
Europe regional macro + geopolitical stress pulse (no params)
Simplify a fraction
Reduce a fraction to lowest terms and describe it: numerator/denominator (denominator normalized positive), sign, whether it is an integer, and a…
gateway.gmfarcaster.com
Request an On-Air Shoutout read on the GM Farcaster livestream
grov
grov: Facebook Followers. ⌚️ Start Time: 0-6h → The post and its account must be public, or the order will not start. 🔗 Link Example:…
Hosaka
Use when you have a company domain and need to know what the company is before spending more. Returns the company name and site title, domain age,…
Create iCalendar
Build a valid .ics document from event fields (summary, start/end, location, …).
Generate a ULID
Generate one or more lexicographically sortable ULIDs (monotonic within a call).
intel.hugen.tokyo
Multi-source token due diligence — same aggregation as token-report (security checks, market data, liquidity analysis from 4+ sources) with weighted…
Korea Business Verify (KBV)
Search for a Korean company by name and get its business registration number. Use this when you only know what a company is called — in English or…
KYA Brasil
Signed verdict: is this action (action, amount, currency, counterparty, payment instrument) inside the agent's mandate and is the credential active?…
liquita-x402-edge.liquita.workers.dev
Real-time at-risk DeFi borrowers across Aave V3, Morpho, Comet, Euler V2, Fluid, Moonwell, Spark on 11 EVM chains. Returns health factor,…
madoromi
Japanese dream-interpretation agent API. Returns a Gemini-generated full interpretation from madoromi's curated dream-motif knowledge base (result…
Table of contents
Extract the heading outline from Markdown — depth, text and a unique GitHub-style anchor slug for each heading. Optionally limit to a maximum…
mcpfax-utility.bowling-anthony.workers.dev
Email validation — Syntax check + live MX/deliverability + disposable-domain flag.
The Agent Carnival
🔥 The Campfire — toss a SPARK into the fire ($0.01): one word or tiny phrase. You see only the spark before yours (GET /booth/campfire); different…
miningincidents.org
MSHA mining fatalities feed, newest first, including OPEN preliminary notices (scraped 32–180 days ahead of the official dataset and flagged as…
modell.halowerk.com
Compares two submitted sample sets feature by feature and returns deterministic drift metrics. Continuous features are binned on the combined value…
money-agent-production-736f.up.railway.app
Call when you need the text of one public http(s) page. Required query url. SSRF-gated. Not a search engine and not a GitHub clone.
netz.halowerk.com
Resolves a prefix to its announcing autonomous systems and puts that answer in context. The current state gives every origin AS seen for the prefix,…
Agent News Hub
Groups managed news feeds into events when an agent needs a compact news briefing. Supply topic, language, time window and result limit using the…
ontarioprotocol.com
Publish your x402 API for agent discovery with an Ontario profile and Bazaar Launch Passport after free validation: public profile, readiness…
pathmint.edge.report
BEFORE YOU PAY Messari ($0.10–$0.25+): SKIP_MESSARI (use cheaper Pathmint/Signals), PAY_MESSARI (exact official endpoint + price), or ABORT…
Constant list
List every physical constant in the dataset, or only those in a given category (universal, adopted, electromagnetic, atomic, physico-chemical).…
SchemaCheck Agent
Validate JSON against a JSON Schema. Checks LLM and agent output and API request payloads, returning structured errors with error codes, JSONPath…
pulsefeed.dev
Is this x402 endpoint safe to pay? Vet an unknown seller BEFORE paying: pay/avoid verdict, 0-100 trust score, live 402 probe, scam flags (payTo…