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.
Pay-per-call data API for AI agents: LLM prices and cost calculator, MCP server directory, country/holiday/currency lookup, page and link checks, page-to-markdown. x402, USDC on Base, no signup. Details · Open the API
We run this API ourselves; it is listed here under the same rules as everyone else.
* Call and payer counts come from the public x402 Bazaar index (snapshot 2026-10-17T23:56Z), not from us. Sorted by reported paid calls in the last 30 days.
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AX1 Console
Send a Base token contract address, get an AI-written verdict: onchain metrics, a plain-language take, and a shareable verdict card. Entertainment,…
blockrun.ai
AI chat completions API - pay per request with USDC on Base
X Pay
Payment receipt with transaction details
x402.sniperx.fun
Get SmartMoney trading activities on token (sorted by time descending)
agents.chain.link
Chainlink For Agents: execute a catalog workflow by workflow name.
Pocket Network
An agent-only messaging network. Agents register with an Ed25519 key and talk in public rooms and end-to-end encrypted private rooms and DMs. POST…
keyring-agent.blockchhub.link
Pay the send-native execution fee (native coin transfer)
StableEnrich
Exa Search - Neural search across the web
Project Time-block scheduler
Fleet fuel records - Record quality audit: Record quality audit for Fleet fuel records. Up to 200 supplied typed records. Local descriptive…
win.oneshotagent.com
Read a web page and extract content as markdown with screenshot
Storm Station 247
Everything one weather instrument is reporting now: each figure with its unit, the raw observation, where it stands, its 247 rank and its station…
Image generation
Current and historical funding rate for one perpetual futures market, from a live derivatives venue: hourly rate, the 8-hour and annualized…
api.onesource.io
Latest Ethereum block height - current chain tip via eth_blockNumber
Agents Trust API Search
API recommendation and x402 discovery for your task. Required query: need. Which API should I call? Describe a task in plain words and let Recommend…
svm402-service
Solana token price and liquidity before you swap: one cheap per-mint market-data call returning the live price and liquidity depth, sourced from…
Losbeto Market Intelligence
Real-time SOL/USD from the Pyth Network oracle with its confidence interval and publish slot. Sub-second freshness, straight from the on-chain price…
SolEnrich
Trailing 7d, 30d, and lifetime holder yield: rewards distributed in the quote asset, priced in USD, divided by average market cap over the window…
Exa
Exa /search endpoint
StableTravel
Search cached Seats.aero award availability by origin, destination, dates, cabin, carriers, and pagination.
x402.orthogonal.com
Find email address for a person synchronously. Provide name + company or LinkedIn URL.
Gondola
OpenAI-compatible chat completions across the Venice AI model catalog. Pay per request in USDC on Base via x402, with no account and no API key.…
x402.twit.sh
Search Twitter/X tweets with advanced filters. Returns up to 20 tweets per page, most recent first, with pagination. At least one filter required.…
Nansen
Get Address Current Balance Data
api.strale.io
Validate an email address: RFC 5322 syntax, MX records, 5,361 disposable domain detection, role-based address detection (35 patterns), free provider…
api.x402node.dev
China A-share major indices snapshot in one call: Shanghai Composite, Shenzhen Component, ChiNext, and CSI 300 — with price, change, percent change,…
Academic Paper Search
Academic and scientific paper search API. Search research papers and scholarly literature across arXiv, PubMed, OpenAlex, Crossref, and Semantic…
api.loyalspark.online
Onchain loyalty platform on Base Network. Businesses launch branded rewards in minutes, customers earn real value with every purchase, and AI agents…
Otto AI
Importance-ranked crypto headlines with per-article source links and publish times, plus a sentiment-scored market brief. Regenerated hourly; meta…
Saylor Innovations Data Desk
Solana token price by mint - USD price, changes, liquidity, volume and FDV
Scry Wallet Intelligence
Solana wallet risk screen via x402 (quick flag): service/router quarantine, bundler-routing hint, identity when covered, coverage and cached…
x402-api.aubr.ai
Send an HPKE-sealed literature query to Aubrai and receive an encrypted result. The transport terminates at Aubrai; literature retrieval and…
Vextorium
Historical ECB euro reference exchange rate for any date since 1999 and conversion between any two published currencies.
Google Trends SEO Keyword Data
Google Trends interest over time for a keyword — worldwide search popularity as a monthly series for keyword research, SEO & demand trend analysis.
api.surplusintelligence.ai
Get OpenAI-compatible inference from many models at market prices via Surplus Intelligence.
Vaaya
Firecrawl — Scrape a single URL and return clean markdown/HTML.
Jev Structured Evaluation
Structured evaluation with TypeSafe's Jev (System One) model. Send any state plus typed questions — noul (true/false), choice (pick one), or score…
Keyword metrics overview
Keyword volume API: get exact SEO metrics for a list of keywords you already have: Google monthly search volume, CPC, competition, keyword…
ReadX
Search for tweets by query (optional product filter; paginate with cursor). Example: GET /api/search/tweets?q=typescript
agentshelf.syntexa.ch
Call when an agent needs favicon and apple-touch icons extracted from a public page or HTML (SSRF-safe). Send JSON {"html":"<link rel=\"icon\"…
api.jarvisclaw.ai
AI responses API - OpenAI-compatible multi-turn agent responses, pay per token with USDC
Maha Celestial Calculations
Compress long documents and RAG inputs into token-budgeted, deduplicated context packs with source-linked provenance. Returns original and compiled…
api.deepnets.ai
Token safety analysis for a Solana mint: overall risk level, wallet-network concentration, bundle detection, mintable/freezable flags, critical…
base.mapleai.shop
Jev structured decisions via SystemOne, priced by input tokens
Convert between XRP and drops
LLM chat completion (qwen2.5:7b on the operator's RTX 5090 Laptop GPU) — Genesis402 / UnyKorn Operator Network
Twitter/X API
Search Twitter/X with structured filters or raw advanced-search syntax. Returns up to 20 normalized tweets with full text, author details,…
api.myceliasignal.com
Ethereum spot-futures basis and annualized carry — cross-venue arbitrage signal for basis traders — Ed25519 signed attestation
IP Geolocation Lookup
IP lookup and geolocation: resolve any public IPv4 or IPv6 address to location and network data from a local database (no third-party call, answers…
glim.sh
Search tweets with advanced operators (recommended). Body param is `query` (not q), e.g. {"query":"from:elonmusk AI min_faves:100"}
Glassnode
Percent Balance on Exchanges — The percentage of supply held on exchange addresses. Data by Glassnode.
AI Market Brief
The zoom-out flagship: aggregates trending and newly-listed Base tokens, then AI writes a concise market brief — mood, highlights, new & notable…
NetIntel
Email deliverability & domain security check — validates SPF, DKIM (multi-selector), and DMARC, detects spoofing and misconfigurations, and returns…
Maxwell x402
Ski lift ticket and ski pass prices for one ski resort, as the resort publishes them: day, multi-day and season tickets by age band, sales channel…
x402scan
Paginated list of merchants (top recipients by volume)
x402engine.app
x402engine — Premium text-to-speech with ElevenLabs — ultra-realistic voices, multilingual support, custom voice IDs
a2apay Agent Query
On-demand AI responses backed by autonomous ICP canisters. Submit a prompt, get an answer — redundant infrastructure, pay-per-query, no account…
cloud.trycorpus.ai
corpusAI Cloud Pricing: One day's fixing for a ticker: median USD per GPU-hour of eligible quotes, with low, high and count.
DYOE Contact Extraction
Extract public business emails, phone numbers, and social profiles from a website. Batch-safe contact enrichment for autonomous agents. Input:…
Cult OS Developer Tools
Crypto Signal Feed
Automaton Paid API
Summarize supplied text faithfully in at most 100 words and return JSON. Use when an agent needs concise compression of a document, article, log, or…
FiatDock Marketplace
Pay-per-call: DeFi Lending Yields
x402-gateway
Token Price Lookup: Get the live USD price of any token by symbol (e.g. BTC, ETH, SOL, PEPE). Pay per call in USDC on Base via x402 — POST…
x402stock.xyz
End-of-day OHLCV bars for every US-listed ticker on a single date; one call returns the entire market. Pass `?date=YYYY-MM-DD` (required). From…
Edge Agents AI
Latest available Türkiye central government debt plus a comparable annual history from the World Bank World Development Indicators API, with source,…
x402.tavily.com
Tavily Search - advanced mode
x402-payment-test
Cheapest possible Base-mainnet x402 conformance call: settle $0.001 of USDC and receive payer identity, request echo and receipt. Built for agents…
tld-info-zone
About the .zone top-level domain: registry operator, type (generic, country-code, sponsored), IANA/RDAP details, WHOIS server, creation date, DNSSEC…
HubVibe
Full website audit in one call: accessibility (WCAG 2.1 A/AA via axe-core), on-page SEO, HTTP security headers and page speed / page weight, from a…
Satellite & GeoRisk x402 API
Agent-ready satellite observations for any coordinates. Returns PNG image URLs and scene metadata for true color, vegetation, water, thermal, or…
api.xynaptic.io
Xynaptic Crypto Price — real-time snapshot of 6 major crypto assets (BTC, ETH, SOL, ADA, LINK, DOT) with 24h changes, breadth and top movers. USD…
Market Intelligence API
Crypto news and stock market news, latest headlines: crypto and US stock headlines plus material corporate filing events (8-K) with extracted…
base-gas-x402
Live Base mainnet gas oracle: EIP-1559 base fee, low/medium/high priority tiers in gwei, and the cost of any transaction in USD and ETH.
World Clock / Timezone
World clock API — exact current time for any IANA timezone with UTC offset and correct daylight-saving handling. Deterministic on-chain execution by…
SocialFetch
List Reels from one specific Instagram profile by handle (not a keyword search — use instagram.search.reels.list for that; not trending — use…
2s
AI web search optimized for agents. Returns ranked results with the relevant extracted content of each page (not just a link + blurb), plus a…
DDG Agent-Payable Services
DDG agent-payable service request
botsmith
X Tweet Search ($0.02/call): Search X (Twitter) posts with full advanced-search syntax (from:, since:, until:, exact phrases, boolean operators).…
Driftflight
Generate an image from a text prompt
TickersFeed
Real-time or 15-min delayed stock quote and share price for any US equity ticker — current price, open/high/low/close (OHLC), previous close, and…
Rug check for Arc tokens
Rug check for Arc tokens: a 0-100 safety score with the reasons, for a token or a Uniswap v4 pool. One call, one answer: should you buy this Arc…
ApiToll Facebook Advertiser Ads
Facebook Ad Library search by keyword — every live and recent ad matching a search term across all advertisers on Facebook, Instagram, Messenger and…
api.you.com
You.com Search API: real-time web search returning ranked results grouped by section (results.web, results.news), each with url, title and…
Crypto Fear & Greed Index
Keyword news search across web news engines (Bing/DuckDuckGo/Yahoo via ddgs). Returns dated headlines with title/url/snippet/source/image +…
apexrunner.ai
APEX Runner: Market Tick Signal
Oblique Markets
Use when an agent needs a trusted UTC timestamp or the smallest end-to-end test of its x402 payment client. Returns Current server time as ISO 8601…
Tanod utilpeek
Get the current gas price and base fee on Ethereum, Base or Robinhood Chain. Input: chain. Returns gas price in wei and gwei plus the latest base…
x402Pulse
Polymarket trader scorecard for any wallet: skill score (0-100), edge over the odds paid, win rate vs. the win rate the odds implied, return (ROI),…
AISkills402: Proofread
Proofread — Proofreads a text with minimal intervention, in the language of the text. Fixes spelling, grammar, punctuation and obvious typos, keeps…
Horror Story API
Access the exclusive horror story collection (pay-per-read).
tick.hugen.tokyo
Get real-time Best Bid/Ask for any FX pair, aggregated from multiple institutional liquidity providers. 62-88% tighter spreads than any single…
SiteCheck
Currency exchange rates from the European Central Bank (about 30 currencies, back to 1999): latest or a given date, amount conversion, or a daily…
CheapTokens AI Inference
OpenAI-compatible LLM inference and chat completions via discounted Venice API credits. Pay USDC to receive a live Venice.ai API key for /api/v1…
Relaystation Screening
$0.01/screen. Screen any name against OFAC, EU, and UK sanctions (UN included) plus Wikidata-derived PEP watchlists — fuzzy matching, instant JSON…
3Route
Price a swap without building a transaction. Returns expected input, output, and gas without constructing an executable transaction. Quotes are…
StableUpload
Buy an upload slot. Agent uploads file via returned URL.
agentbit.app
Live web search for AI agents: returns ranked results with title, URL, snippet, publish date and source. Neural + keyword search across the current…
Tech Detect
One HTTP request per host, matched against an in-house signature set. Every hit carries a confidence value from 0 to 100 and the evidence it rests…
x402.browserbase.com
Web search with structured results. $0.01 per request.
quotient-api-gateway.onrender.com
Use this to read published Quotient signals. Sports signals return one game-level pick and markets[] with every linked venue listing, its…
AgentRXI
x402 service finder: describe what you need and get matching pay-per-call x402 services from the Coinbase Bazaar directory, cheapest first, with…
AgentsToolsHub
Fetch an RSS or Atom feed and return normalized JSON items: title, link, publication date (ISO) and summary. Server-side fetching with SSRF guard;…