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.
uk-charity-verify.iykykblog.workers.dev
Verify a UK charity against the Charity Commission for England and Wales register. Look up by registered charity number or name; returns…
uk-cm-kg.ai
One paid call on uk-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…
uk-owner-screen.iykykblog.workers.dev
UK beneficial ownership screening: company number returns persons with significant control (PSC) — name, kind, nationality, nature of control.…
UnderIndex
Verified reference record for one niche fashion subculture: years, key brands, iconic items, music, where to buy, a price range, and a WARNING note…
url-oracle
Checks whether a URL/domain is safe to fetch, cite, or follow: flags phantom-squatted or typosquatted brand domains, unregistered or brand-new…
us-cm-kg.ai
One paid call on us-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…
US National Debt
Latest US national debt — Treasury Debt to the Penny totals, debt held by the public and intragovernmental holdings in exact dollars. Daily federal…
US Overnight Rates
US overnight interest rates — latest SOFR secured financing and EFFR effective federal funds benchmarks, volumes and policy target range for dollar…
US Treasury Interest Costs
Average interest rate the US Treasury pays on its outstanding debt, latest month, by security: Treasury Bills (T-bills), Notes, Bonds, TIPS, FRNs,…
JSON Schema Validator
Validate JSON data against a JSON Schema (draft-07, Ajv). Returns valid + detailed errors with instance paths.
vehicle-recall-check.iykykblog.workers.dev
Check NHTSA safety recall campaigns for a vehicle by make, model, and year — or by VIN (decoded live via NHTSA vPIC, then matched). Returns campaign…
Vektorwerk
Embeds up to 32 texts on the local Ollama runtime. Returns explicit model and dimensions; no paid third-party API is called.
VENZIA LAB Company Research
VENZIA LAB company research and company intelligence for AI agents. Get a cited JSON report from public sources: overview, key facts, company…
vessel-verify.iykykblog.workers.dev
Verify a USCG-documented vessel by official number, IMO number, or name. Returns vessel name, official number, IMO, flag, service/type, tonnage,…
3HZ Daily FX Reference Rate
Daily reference foreign-exchange rate for any supported fiat currency pair using Frankfurter/ECB reference data. Query base and quote ISO 4217…
weather.agentic-jp.com
List every JMA forecast office (府県予報区) in Japan with its code, Japanese/English name, and class10 sub-regions. Use this to discover valid `:area`…
Text Summarizer Agent
Summarize and compress text, Markdown, or JSON into a structured summary. Output as prose, bullets, headline, or TLDR, with optional exact target…
WebPulse
Web content extraction and search. Get clean markdown from any URL or search results.
website2vat
Look up VAT and company registration identifiers for one website domain.
well-008-text-stats.mmelnyk2000.workers.dev
Fetch a public https URL that returns text and compute byte/char/line/word counts plus SHA-256 ($0.005 USDC via x402). https only — http, file,…
whale.memoryapi.org
Combined whale digest — billionaire 13F + top insider activity in one call.
who-gho-indicator-timeseries.hergertsynthora.com
Returns WHO Global Health Observatory OData time series (ghoapi.azureedge.net/api) for an indicator such as life expectancy (WHOSIS_000001):…
witness.bnbot.ai
Get tweet details with signed proof
agentfive.ai domain sale
Purchase dossier for the domain agentfive.ai: fixed price US$5,000,000 USD, every payment route (USDC on Base, escrow, marketplace), the transfer…
www.balticdryindex.com
BDI derived indicators (trend, momentum, volatility, regime)
www.bitcoind.app
Complete list of all Bitcoin Core RPC methods (summaries). One call replaces up to 142 individual lookups. Returns name, category, summary, and…
www.paylog.dev
8 Things That Tripped Me Up Implementing x402
www.rwakernel.com
Resolve an EVM token to registry identity. A match is not issuer verification.
Stratalize
Stratalize — Project Controls for construction schedules. Pay-per-call finance, legal, healthcare, and compliance data tools, each with a signed,…
www.tokenctl.io
Risk scan for one Solana SPL token. Call it before buying, listing, accepting or recommending a token you have not vetted. Checks mint and freeze…
ST0x Tokenized Equities
Use this when you need to resolve a stock ticker to its ST0x on-chain token, or check whether a contract is a genuine ST0x tokenized share: the…
x402-mainnet.vercel.app
Access to protected content
Klima Retirement Aggregator
Live snapshot of the most liquid carbon credits retirable on Base: the top 3 Klima Protocol carbon classes and the top 3 Carbonmark marketplace…
Cloudless x402 - lambda runtimes
Supported AWS Lambda runtimes (paid per invocation)
x402.fablerlabs.com
Compare current perpetual funding rates across Binance, Bybit, Hyperliquid, and, for single-symbol requests, OKX. Returns interval-normalized…
JMT EDGAR Company Lookup
Company intelligence lookup: resolve a US-listed company ticker through the SEC EDGAR company ticker dataset. Returns CIK, ticker, and registrant…
x402.tokenizen.nl
3ilm vulnerability pattern search — 1032 exact-reconciled findings from 10 Sherlock contests
Crypto TA Signals
Multi-indicator technical analysis (SMA/EMA crosses, Bollinger, RSI, candlestick patterns, support/resistance, trendlines, experimental Elliott…
VALUNARIA BUS-WEB
VALUNARIA BUS-WEB web.research.v1
x402 Market Data
Search the x402 market by keyword or category and get offers ranked by real repeat usage (payers, calls per payer, last payment, price) from a daily…
x402payswap.vercel.app
Premium alpha — Curated on-chain alpha: yield venues, mempool anomalies, and replayable agent trade intents.
x721.dev
View the roadmap
zendiq-backend.onrender.com
Solana swap triage for AI agents. Returns a Safe / Protect / Refuse verdict for a proposed swap: token risk screening, sandwich-attack exposure, and…
01mind.net
01Mind listing: dyn-baf663b065a63397
a402test.pages.dev
Premium access data endpoint gated at $0.05 USDC
AegisAI
AegisAI risk verification
aegis-audit-x402.project-easy-x.workers.dev
Audit smart contract honeypot, taxes, liquidity, and risk score for autonomous agents
Agent Embassy
Compute market snapshot — live spot prices: cheapest rentable ask per class in USD/hour. $0.25 per query via x402 USDC on Base or Arbitrum One.…
Agent Dispatch
Send one SMS to a mobile number, paid per message in USDC with x402. Use it when an agent must notify a person by text. The 402 quotes the exact…
agent-drift-api-production.up.railway.app
Register a golden test case that monitors an API endpoint for behavioral drift (compares live responses against expected output). Returns the…
agent-foreign-agent-screen.iykykblog.workers.dev
Check whether a firm or person is a registered foreign agent under FARA (Foreign Agents Registration Act), and which foreign principals they…
agent-healthcare-exclusions.iykykblog.workers.dev
Check whether a person or entity is excluded from federal healthcare programs (HHS OIG LEIE). Returns potential matches with exclusion type, date,…
agent-insider-flow.iykykblog.workers.dev
SEC Form 4 insider transactions by ticker or insider name: open-market buys/sells, grants, exercises and other reported transactions with shares,…
agent-lobbyist-screen.iykykblog.workers.dev
Screen a company or organization against U.S. federal lobbying disclosure (Senate LDA) filings: is it a registered lobbying firm, who lobbies for…
agent-msb-verify.iykykblog.workers.dev
Verify whether a business is a registered money services business (MSB) with FinCEN. Returns registration status, MSB activities (money transmitter,…
Revenue Agent
Use to detect breaking changes and API drift in a public OpenAPI/Swagger spec (JSON or YAML URL). Compares the spec with the service's last stored…
Agent Economy Report
Operational trust rating (AAA to D, trust line BBB) of any x402 service, as of today: tier, outlook, flags, uptime, organic paying agents, settled…
agentic-ask.ai
One paid call on agentic-ask.ai for $0.01 USDC: the surface's own statement of record (a market node: its list_nodes line; a product: its record of…
agentic-disclosure.ai
One paid call on agentic-disclosure.ai for $0.01 USDC: the surface's own statement of record (a market node: its list_nodes line; a product: its…
agentic-esg.ai
One paid call on agentic-esg.ai for $0.01 USDC: the surface's own statement of record (a market node: its list_nodes line; a product: its record of…
agentic-issuers.ai
One paid call on agentic-issuers.ai for $0.01 USDC: the surface's own statement of record (a market node: its list_nodes line; a product: its record…
agentic-radar.ai
One paid call on agentic-radar.ai for $0.01 USDC: the surface's own statement of record (a market node: its list_nodes line; a product: its record…
agentic-registries.ai
One paid call on agentic-registries.ai for $0.01 USDC: the surface's own statement of record (a market node: its list_nodes line; a product: its…
agentproof-murex.vercel.app
JSON repair for AI agents - fix malformed JSON and return structured output.
ai-mail.sh
New @ai-mail.sh email inbox for an AI agent: 30 days, up to 500 incoming emails. Receive-only; codes and verification links extracted. Docs:…
allooloo.io
One paid call on allooloo.io for $0.01 USDC: the surface's own statement of record (a market node: its list_nodes line; a product: its record of…
AltSpider
Pay or skip on someone else's 402: network, answered, free sibling, one reason
ScreenSeal
ScreenSeal — sanctions screening: a name checked against the OFAC SDN and EU FSF lists. Informational signal, not legal advice.
api-datos-uy-ar
Unidad Indexada (BCU) para una fecha. Sin `fecha` devuelve la de hoy.
api.aitrailblazer.net
Top stressed crypto issuers from the current DeltaSignal slice.
api.aizamon.com
Polymarket vs Kalshi arbitrage / cross-venue mispricing gap card — $0.25 Bot Fuel. Top spread + net-edge for trading bots. Inline JSON. Scale via…
Apex
Search normalized vehicle variants by brand, model, model year, powertrain, market, or free text.
api.automatonsvrn.xyz
Automaton-Sovereign Value API call
Checkpoint402 Tx Explainer
Explains any Base or Ethereum transaction in plain English: who sent what to whom, which tokens/NFTs moved, the function called, success/failure and…
DataSieve
Something you cannot do while your agent is dead: keep watching. One paid call buys 7 days of it — on-chain on Base (wallet activity, whale…
api.forum-labs.com
Deep endpoint trust/QoS report for an x402 endpoint. Everything the trust score returns PLUS history detail: the full payment-terms drift log…
api.freaks.one
freaks-v2-1106-sniper
Free Small Biz Tools
Free Small Biz Tools API: Late-fee reminder email for an overdue invoice. Calculates the late fee and writes a ready-to-send reminder (subject +…
api.getsly.ai
HTTPBin Test Echo - a Sly-published x402 service running on Sly's gateway (api.getsly.ai). Used to validate the publish + gateway flow end-to-end.…
haven-media
Edit an image from a text instruction. SFW only.
api.melvea.com
Grounded honey recommendations: send a flavor/use/occasion intent, receive ranked varieties chosen from Melvea's proprietary flavor, terroir, and…
Ned Watch
Why is this host failing right now? One call, no account: Ned probes it (DNS at three resolvers, its nameservers, TCP, TLS, HTTP timings, CDN and…
api.octodamus.com
Octodamus — AI oracle for crypto and tokenized NYSE markets. BUY/SELL/HOLD signals, Polymarket edges, Fear & Greed, macro regime. Ed25519 signed.
api.provenpaid.com
Call before paying an unfamiliar x402 endpoint to check that it is real and actually gets paid. Pass ?url=<endpoint URL>. ProvenPaid probes the…
api.proxyllm.ai
LLM cost scout: send your monthly OpenAI API spend in USD and get back the flat ChatGPT/Codex subscription tier that absorbs it through the ProxyLLM…
api.seneschal.space
Single-fact: timestamp + age of the most recent Zcash block, plus hash, difficulty, and size.
SpendPreflight
Spend preflight for AI agents. Send the x402 PaymentRequired body (v1 or v2) you received, or a cart, plus optional rules (per-payment max, hold…
api.suverse.io
SuVerse GovHub — pay-per-call government API gateway
svgsmith
Convert a raster image (PNG, JPEG, or WebP) into clean, editable, self-verified SVG vector art. Pay per conversion in USDC on Base via x402 - no API…
TrialBase DB
Search normalized clinical trials by registry, condition, intervention, sponsor, country, status, phase, study type, or free text.
SAF-Authority AgentPay Check
A paid Governed Machine Commerce service running on AgentPay, SAF-Authority's Core Engine Framework. Before spending, a software agent submits one…
x402card Freeland Travel eSIM
Buy a prepaid Freeland travel eSIM and privately receive its installation QR and activation data. Pay native USDC on Base through x402; no API key…
au-cm-kg.ai
One paid call on au-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…
Instant Microcopy Audit
Analyze French or English marketing and interface copy. Returns a clarity score, repetition data, sentence metrics, CTA detection and concrete fixes.
US Treasury Avg Interest Rates
Average interest rate the US Treasury pays on its outstanding debt, latest month, by security: Treasury Bills (T-bills), Notes, Bonds, TIPS, FRNs,…
barriere.halowerk.com
Abbreviation expansion audit fetches current public evidence from the supplied target and evaluates the documented criterion. It returns the…
base-intel-api.jakemaxsigal.workers.dev
Base gas oracle / Base gas price API / Base L2 gas fee tracker / real-time gas estimator / swap cost estimator. Returns the current Base fee,…
Base Pulse
Run before buying, accepting or recommending a token on Base. Answers SAFE, CAUTION or AVOID with the exact reasons, from a simulated buy and sell,…
bau.halowerk.com
Prüft am Objekt artikel den Befund vorhandene Meta-Beschreibung.
beta.surplusintelligence.ai
Get OpenAI-compatible inference from many models at market prices via Surplus Intelligence.