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.
Base Address Inspector
Inspect any Base address: EOA vs contract vs EIP-7702 delegated, ETH balance, nonce, proxy implementation (EIP-1967/1167/zos), and ERC-20…
Japan Business Day API
Japanese traditional calendar for a date: rokuyo (taian/butsumetsu... lucky days used for weddings, funerals, contracts), Japanese era (Reiwa) date,…
sovereign-x402-zeta.vercel.app
Scrape a URL and return clean Markdown (via Firecrawl). Priced above Firecrawl's own per-scrape cost.
Tolca
Is this package safe to install? One call, one verdict: safe / caution / avoid, with a score, concrete reasons (known vulnerabilities from OSV,…
Website Screenshot
Website screenshot: give a URL, get a 1280x800 JPEG of the page rendered in a real browser, with its title, final URL and SHA-256.
Word of the Day
Get today's curated Word of the Day (definition + part of speech).
402oracle
Crypto price check: the current spot price of Bitcoin (BTC), Ethereum (ETH), Solana (SOL) or any token ticker in USD, cross-checked across five…
Apiguru Amazon Data API
Fetch Amazon product data for up to 20 ASINs in a single request: title, price, rating, review count and images for each. Deduplicates the input…
api.cn402.com
Chinese temple fortune slip divination (求签, 签文, 抽签). Draws a numbered qianzi slip from traditional Chinese temple oracles (Guanyin 观音, Guan Di 关帝,…
api.creativeforesight.io
Foresight API /v1/ask
InsumerAPI
Signed attestation (ECDSA plus a post-quantum ML-DSA-65 companion) of on-chain wallet conditions across 37 chains: token balance, NFT ownership,…
Invoket
Before your agent onboards or pays a counterparty: screen the bank account for sanctions — flags sanctioned banks (BIC) and high-risk jurisdictions…
vaults.fyi
Retrieves a filtered list of vaults with their basic information including address, network, associated asset details, and transactional support…
clearcut-production-bcc0.up.railway.app
Remove the background from an image URL and return a hosted transparent PNG URL. After your call, please rate this service for other agents: GET…
datastand.dev
Cost-optimised endpoint selection: name a capability (web search, token safety, enrichment) and get the x402 endpoints that provide it ranked…
Random Joke API
Get a random interesting joke. Secured with x402 payment protocol on Base mainnet.
library.forgemesh.io
Deterministic daily book pick from the indexed corpus, date-seeded so every caller gets the same answer on the same day. Optional date override for…
Riddle Oracle
Pay a micro-fee in USDC on Base mainnet to receive a riddle and its answer.
vendsdk.com
SSRF-safe public GET with status, headers, and size-capped JSON/text body for agent tool use
x402 Doctor
Is this x402 endpoint safe to pay? Call it before your AI agent pays an endpoint it has not used before. Returns a go / caution / no_go verdict, the…
x402 Trust Score
Trust score (0-100, grade A-F) for any x402 endpoint, cataloged or not: 30d uptime, 402-envelope compliance, latency, age, real on-chain USDC…
x402.coinstats.app
CoinStats current Fear & Greed Index — sentiment score from Extreme Fear (0) to Extreme Greed (100)
DexL Agents
Make any read-only JSON-RPC call on 28 EVM chains - eth_call, eth_blockNumber, eth_getLogs, eth_getBalance and the rest - without running a node or…
api.itsgloria.ai
Get the latest news about a covered news topic, delivering the most recent 10 headlines.
api.secondedoracle.xyz
SECONDED checks EVM transactions, permits, tokens, agent registrations and suspicious messages before you sign or act. Two rival-lab models must…
Astro Agents
Birth time resolver: Local birth time + place -> exact UT, historical UTC offset, Delta T, Local Mean Time, true solar time.
ChronoSure
Resolve a local time to an exact UTC instant with explicit DST ambiguity handling, business-day arithmetic, public-holiday status, and working-hour…
marketplaceforaiagents.com
Google Search API: Give a query, get ranked organic results with title, link, snippet, plus knowledge graph and related searches. $0.003 USDC per…
ZenSched
ZenSched `form_list` — List your forms with submission counts. Pay-per-call $0.01 USDC; the paying wallet owns the org (auto-provisioned on first…
ot-intel-api.onrender.com
Recurring public "State of OT Threat Intel — GCC" sitrep, human-reviewed before publish, sourced from the same intel.db pipeline as /ot/sitrep. Pass…
MiroShark
MiroShark: predict how people and markets react to any scenario - a product launch, policy, campaign, crisis, token launch, or news headline. Spawns…
api.liquidagent.ai
Search Mint & Marquee for gifts and collectibles: products that match what the person wants, under their budget, with price, photo, a short…
Apple App Store Search & Reviews
Apple App Store product details — full profile for a single app by product_id: rating, price, description, version history, screenshots & metadata…
Ausref - Oceania reference data
Australasian official government reference data as cited JSON, every covered country: income and corporate tax, VAT/GST, CPI inflation, central-bank…
gblin.digital
Call before your agent pays an x402 service it has not used recently: is that endpoint actually alive? Liveness of the ~200 most recently updated…
Hyperliquid Prediction Markets
The catalog of Hyperliquid prediction-market outcomes and their metadata.
Multichain RPC/balance
Native coin and ERC-20 token balance for any wallet address on Base, Polygon, Arbitrum, Optimism or Ethereum. Returns raw and human-decimal amounts…
rugshield-402.onrender.com
Simulates buy/sell orders via state overrides to detect honeypots, compute exact transfer taxes in bps, and verify pool liquidity depth.
SignalPulse
Crypto market tick — BTC, ETH, SOL live price + 24h change, Fear & Greed index, and a deterministic regime verdict (RISK_ON / DRIFT_UP / CHOP /…
TrustAgent
Sanctions screening for a crypto wallet before you pay it: checks the address, and an agent's owner and payout wallet, against OFAC SDN-listed EVM…
weather.hugen.tokyo
Instant weather by city name — temperature, feels-like, humidity, wind speed, precipitation, and condition. Just pass a city name; geocoding, data…
Weight Converter API
Convert a weight/mass value between units (kg, g, lb, oz, stone, tonne, and more).
x402.creative-tim.com
Get ShadCN UI component blocks and templates
FTSO Yggdrassil
Real-time cryptocurrency price from the FTSO Yggdrassil value provider
DCL Trust Oracle
Low-latency pre-action screening for routine agent responses and tool-call decisions.
crypto.forgemesh.io
Returns current market risk state, per-symbol signal streaks, and active cooldown timers — use it as a pre-trade risk gate before acting on any…
geo.halowerk.com
Creates or inspects H3 cells and optionally returns neighbors or changes resolution. Missing facts are returned as null and named in…
Ground resolution & scale
Un-project Web Mercator (EPSG:3857) easting/northing in metres back to WGS84 longitude/latitude in degrees.
ParseAPI
Recall tenant memory
regimeshift.xyz
ETH Volatility Risk Premium — DVOL minus Parkinson realized vol (72h). Positive = sell-vol opportunity, negative = buy-vol. Response includes regime…
SQLPermit
Decide whether an agent-authored PostgreSQL statement complies with an execution policy, using PostgreSQL's own parser rather than pattern matching.…
TxGuard
Explain and preflight an unsigned Base transaction, EIP-712 typed data, or an EIP-3009 x402 payment authorization before you sign it. Decodes intent…
Elements Live
Resolve a free-text topic, compound or material to a subject id.
Agent Weather
Readings for one AI model listed on OpenRouter (GET /v1/models/report?id={model id}): input/output prices per 1M tokens with 24h and 7d change,…
Token Allowance & Balance
Crypto spot price that attempts three independent public exchange tickers (Binance, Coinbase, Kraken) and takes the median of the live replies.…
api.healthparse.io
Find HRSA Health Professional Shortage Areas (Primary Care / Dental / Mental Health) by state, discipline, minimum shortage score, or FTE shortage —…
bio.halowerk.com
Multiplies per-contact transmission probability, effective contacts per day and infectious duration to obtain a simple basic reproduction number,…
dev-5090 uncensored inference
Fix broken JSON (trailing commas, single quotes, unquoted keys). Returns only valid JSON.
maraventanoindex.com
Per-call counterparty lookup. Pass ?ua=<counterparty-UA>. Returns ONE signed row: has_record (yes/no), payment-attached count, settlement count,…
penny402
One card per paying wallet per UTC day from a standard 78-card deck, upright or reversed, with the keywords for that orientation and a one-line…
Book chapter
Paid book chapter (x402): Automate the Boring Stuff with Python: What Is Programming. Unit of a larger practical-skills library; free catalog at…
Plainsight
Live crypto prices: USD spot for BTC, ETH and SOL in one call, fetched per call (not cached), so the figure is the number right now. A cheap,…
signals.edge.report
Crypto news brief for agents: ranked headlines with source URLs and heuristic sentiment. Topics: crypto, base, defi. Fresh research digest without a…
HTTP Latency Check API
HTTP Latency Check API. Measure HTTP response latency for a URL from the Cloudflare Worker edge. Returns status code, latency, redirect, content…
Event Risk - Next 7 Days
Scheduled market-moving events for the next 7 days by default (?days= up to 90): US data releases with release times (CPI, jobs, GDP, PCE, PPI),…
Page Links
Fetch a reviewed public page and return its links with resolved absolute URLs and anchor text, the canonical URL, the declared meta robots…
Hyperliquid Account Intelligence
A Hyperliquid account's perpetuals state — open positions, margin summary and withdrawable balance, for any 0x address.
base-chain-gas-oracle
Current Base network gas price, read live from a public Base RPC node (eth_gasPrice) and returned in both wei and gwei with the snapshot block it…
mcp-production-f77f.up.railway.app
Use for an overview of one model in the Irish used market: listing count, price range, median, and median price and mileage by model year and by…
AIMarket
MCP security: catch a rug pull or tool poisoning between two tools/list results of the same MCP server — the version you approved and the one it…
oceanalt.com
Deep taint trace: follow funds upstream over multiple hops to see whether they touched illicit sources.
prop.halowerk.com
Subtracts exported energy from supplied site energy, divides by conditioned floor area and selects the first caller-supplied ascending…
Straelo Relay
Extract clean readable webpage text from a public URL, removing boilerplate for LLM-ready research or RAG ingestion.
api.dripmetrics.ai
DripMetricsAI (api description at https://dripmetrics.ai/) provides on-demand market microstructure and risk metrics for agents and developers.…
MACH Base
Check Base chain progress: return the latest mainnet block number for freshness checks and polling. This is not transaction confirmation.
api.onhub.ai
Text completion using the model selected in the request body.
business.agentum.lat
Mesmo dado do /preflight (veredito de contraparte: CNPJ/TCU/CNIA/CEIS/CNEP/CVM ou LEI/GLEIF) — rota técnica liquidada pelo Facilitador CDP da…
Drip
Paid JSON for stock-picker calls (API V2). Bearer API key / JWT / OAuth subscribers (PRO/EXPERT) are served without payment; everyone else pays per…
FilingDelta
SEC filing changes: what changed in a company's latest 10-Q or 10-K (MU's card is its FY2026 10-K; 6-K for TSM and ASML, 8-K for JPM and BAC), 19…
heb-utils-x402.hebutils-api.workers.dev
Order a researched report (company brief, Israeli regulation explainer, market scan, tech comparison). Written from public sources, delivered within…
paddock.finance
Agent payments have no chargeback. Paddock is pre-payment verification for AI agents. get_liveness reports whether a seller's domain answered at the…
ReceiptSure
Check whether a mined Base transaction did what your agent meant it to do. Fetches the receipt, decodes its ERC-20, ERC-721 and ERC-1155 transfer…
space.halowerk.com
Propagates two caller-supplied Cartesian states with constant velocity, analytically finds the clamped time of closest approach, and compares miss…
Global Weather Intelligence
Aggregates global weather forecasts using open meteorological data. Useful for supply-chain routing, event planning, and agriculture commodity…
UUID Generator
Generate cryptographically random UUIDv4 identifiers. POST {"count":10} and receive that many unique v4 UUIDs, 1 to 100 per call. Uses the platform…
x402-fuelprice-poc.theliminalguy.workers.dev
Current UK weekly average road fuel price (petrol + diesel, pence/litre), sourced live from DESNZ (UK gov)
agri.halowerk.com
Converts area, sampling depth, bulk density and initial/final organic-carbon mass fractions into stock estimates and a gross CO2-equivalent…
TradeSonar
Candlesticks (1-minute minimum; no sub-minute)
ukintel
Find a UK company by name. Returns the top 5 matches from the Companies House register with number, name, status and incorporation date. Taster tier…
Gas Price
Get current gas price information (base fee, priority fee suggestion, gas price)
ChainState
Profile a Base address in one call instead of four to six lookups. Returns contract or externally owned plus code size, proxy detection across all…
convrgent.ai
Create a new persistent human profile in the vault. Agent-namespaced by wallet address. Accepts initial identity, text samples, observations, and…
timezone-info-toulouse
Local time and time zone for Toulouse right now: IANA zone name, UTC offset, whether daylight saving is in effect and when it next changes, and the…
emoji.today
Cast a paid vote for today's emoji election on emoji.today
fittings
The 15-digit census block FIPS code containing a US coordinate, with its county and state codes and the block bounding box.
iot.halowerk.com
Groups caller-supplied scalar field changes by field name, selects the highest version, and reports a conflict when equal-version values differ. It…
PayeeGuard
Pre-flight a Base payment destination before you send. Verifies the EIP-55 checksum, measures distance from an address you expect — catching a…
polymarketeer.vercel.app
Get detailed information for a specific Kalshi event by ticker symbol
Linkrra Synap Inference
Linkrra Synap inference — pay-per-call chat completion for model "gpt-oss-20b (you asked for "auto")". Price covers up to 16 output tokens at this…
sol.mapleai.shop
OpenAI-compatible chat completion, priced by counted input tokens + max output tokens at per-model rates