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.
skim402.com
Skim: clean reader — URL to agent-ready markdown + metadata, ~4x smaller than raw HTML
x402-factory
Cheapest endpoint: liveness plus x402 payment pipeline check — Returns ok with the server time and whether this call was paid. Use it to verify your…
Bitrefill
Search 10,000+ gift card & voucher brands across 180+ countries by name and country. Pay in USDC via x402, no account.
Citiview Agent Market
Breached password check: is this password in known data breaches, and how often? Send only the SHA-1 hash (never the password); just the first 5…
TenPrint
Unforgeable operating history for any AI agent attesting through TenPrint: record count, first-seen date, continuity days, and recent activity,…
DeepAI
Creates an image from scratch from a text description. Choose the quality tier with image_generator_version: hd, genius, or super_genius for the…
SweetAI
Check if an agent's reputation is real: Sybil forensics for one ERC-8004 AI agent — reviewer concentration, ghost reviewers, burst detection. Is…
x402.asterpay.io
Source-bounded fact-check. Verify a claim against provided source text. Returns verdict: supported, contradicted, or unverifiable. Does NOT search…
risk.yo.xyz
Targeted node lookup by asset address or protocol/asset name — the sole discovery path
StationFX
Function marketplace for AI agents. Browse economic data, computed signals, and deterministic functions across 12 categories. Pay per call in USDC…
Delx Commerce
Delx Commerce cheap image generation API for agents at $0.01 USDC. Call when you need a product visual, ad creative, thumbnail, banner, logo…
underground.substratesymposium.com
Wire-In Lookup — per-entity merchant-seat verdict. Pass ?ua=<counterparty-UA>; get ONE signed row: score (0.0-1.0 payment-reliability observed at…
glim.sh
Check follow relationship
Ausca Agent Inbox
Lease one ordinary remote browser with standard CDP access for 10, 30, or 60 minutes. No automation, proxy, stealth, or target-success promise.
Random Fact
Returns a single random fact as JSON in exchange for a micropayment.
Sirenic
Name search, European registers. Local copies, all searched without pays: Belgium, Croatia, Cyprus, Estonia, Ireland, Latvia, Lithuania, Norway,…
AgentFeed
Spot price: the on-chain DEX price for SOL, BTC or ETH, the median of deep USDC pools on Solana, Ethereum and Base read from chain state, and the…
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…
Driftflight
Generate an image from a text prompt
PHION Inference
Bounded low-cost inference with a signed delivery receipt
Machina Sports
Tournament fixtures, filterable by team, opponent, and date range.
api.x-402.online
Answer a question about an image, or describe it, from a URL or base64. Image understanding pay-per-call, no account and no API key: send an image…
ManyLives Track Records
Read back values the paying wallet saved with /paid/memory/set: one key, or list your keys by prefix (keys, sizes and expiry, newest first). Another…
gateway.spraay.app
Send email notification for payment confirmations, alerts, receipts.
Kronos Crypto Data & Forecasts
Crypto funding-rate extremes screener: scans all 17 perpetual futures markets…
StableSocial
Scrape Creators · Instagram — Reels
Stock Trends Market Intelligence
Current weekly stock analytics for equity research and pre-trade analysis. Returns the latest Stock Trends indicator snapshot for a symbol. Stock…
x402stock
Get the latest available price for any US-listed stock: the most recent 1-minute bar close plus today's OHLCV, change, and previous close. Currently…
47620 Solana Data API
A LIVE, sourced snapshot of x402 adoption across the public ecosystem: how many pay-per-call services are indexed, on which networks and assets, in…
tempo.halowerk.com
Prüft am Objekt stylesheet den Befund Zeit bis zum ersten Byte.
crawlspur.halowerk.com
Prüft am Objekt parameter-url den Befund Wert des X-Robots-Tags.
spf-authorizes-mailjet-watch
Change watch for spf authorizes mailjet: runs the check, compares it with the result from your previous call for the same domain (kept 90 days) and…
manylives.me
Cheapest real end-to-end test of your pay-per-call (HTTP 402) client: pay US$0.002, get back proof of what was paid (payer, amount, network,…
Forest Web
Detect material public DNS answer changes with a deterministic hash. TTL-only changes do not count and no arbitrary resolver or AXFR operation is…
IP address intelligence
Looks up one IPv4 or IPv6 address against the two authoritative, keyless public sources: RDAP registry data (who holds the block, in which country,…
minia2a.uk
EU market brief — 4 European equity indices (price + % change), the ECB's daily reference rates for USD, GBP, CHF, JPY and CNY, and the latest ECB…
api.glianalabs.com
GlianaAI - pay-per-call AI: LLM chat (OpenAI-compatible), image, video, music, speech - 100+ models, no signup, USDC. This resource: claude-opus-5…
api.locus.report
Hedged prose from cited property records for one place. Each reading names the confirming record; an optional question sets the audience and focus.…
AgentUtility.ai
Checks email deliverability by validating address format, MX reachability, temp-mail risk, role mailbox risk, and SPF/DMARC/DKIM authentication…
agents.ai-rook.com
Current Base mainnet gas prices. Slow, standard, fast in gwei.
Affiliate.com
Search more than one billion affiliate products refreshed daily. Pass a plain search string or an array of field filters, or use the structured…
geoprimitives
Give it a latitude and longitude and it answers with what the nautical chart says about the water there: the depth range of the charted depth area…
api.apify.com
Apify Store is the largest marketplace of tools for AI agents. Extract data from any website and automate your workflows with thousands of scrapers,…
Arkham x402
Get Arkham intelligence for an address. $0.20 per call.
x402stock
Get the latest available price for any US-listed stock: the most recent 1-minute bar close plus today's OHLCV, change, and previous close. Currently…
ApiToll Crypto Prices
Latest crypto token prices by ticker symbol, CoinGecko id, or chain:address (BTC, ETH, SOL, or base:0x…): current spot price, token symbol,…
NodeFlare
Base RPC (chain 8453): JSON-RPC over HTTPS on NodeFlare's own bare-metal nodes. Pay per request in USDC, no account or API key - built for AI…
agentreadiness.halowerk.com
Publisher discovery audit fetches current public evidence from the supplied target and evaluates the documented criterion. It returns the…
tokenguard
Trending NFT collections with floor price, 24h move, volume and average sale. No input required.
agent.api.0x.org
Get the indicative price for a swap using Allowance Holder to set allowances
DeFi Safety Oracle
Focused honeypot check: a live buy-then-sell simulation against real DEX liquidity (Aerodrome, Uniswap V2/V3/V4). Tells an agent whether the token…
eu-verify
Recommended Bitcoin transaction fee rates in sat/vB (fastest, half-hour, hour, economy, minimum) from mempool.space, computed from the live mempool.…
GlobalRules
One specific fact for one country: VAT/GST rate, public holidays by country, visa requirements for travelers, tipping customs, cryptocurrency legal…
Linked Panda
LinkedIn profile enrichment API for one B2B lead
human.twin3.ai
Human verification for AI agents — proof of humanity, sybil resistance, and 'is this wallet a real person' answers in one paid call. Returns two…
DEBYKO
Screen crypto perpetual markets across venues by funding, open interest, price and data age using DQL.
agdata
Look up one public LinkedIn profile per call. Pass {query} as a username (jane-example), a profile URL or a URN; there is no limit field. The…
x402.forgemesh.io
Audio transcription API: transcribe any public audio URL (mp3, wav, m4a, ogg — up to 25MB / ~20 min) to text with a neural speech-recognition engine…
proxy.suverse.io
Bidirectional SPL token swap aggregator on Solana mainnet via Jupiter v6 routing across 30+ DEXs (Raydium, Orca, Meteora, Phoenix). USDC to BONK WIF…
agent.connskill.com
Keyword suggestions for a seed keyword, with search volume and CPC
Telnyx Inference
Text-to-speech (OpenAI-compatible /v1/audio/speech). 4,358 voices across 9 providers (KokoroTTS, AWS Polly, Azure, MiniMax, more — free catalog at…
Blockchain.info API
Paid AI-agent access to Blockchain.com Explorer API
Laso Finance
Get a Firebase ID token for authenticating with the callable APIs
Coil Crypto Gate
START HERE — the cheapest answer we sell ($0.001) and the first call most agents make. Is crypto risk-on right now? Whether the BTC 200-day master…
Blockchain Money Map
Builds a sanitized go-live twin of an agent-commerce mission before a buyer allows payment, delegation, or live execution.
Agent Council
Put one question to a panel of 3 different AI models and get a single verdict back. Each model answers independently, then a chair synthesizes:…
Flow
Use when an agent is about to swap on Base and needs the best executable price before committing funds. Flow best-execution quotes: compares Uniswap…
DopamineDesk AI Marketplace
Search a live public Shopify storefront and return current public products, variants, prices, availability, images, and declared agent-commerce…
Machina Sports
Tournament fixtures, filterable by team, opponent, and date range.
Agent Hub
Quick AI token verdict: a 2-3 sentence plain-English risk summary plus risk level and red flags for any token on Base, Ethereum, Polygon, Arbitrum,…
CRYPTYX
Service health probe — build version, last pipeline run, current signal/composite/asset counts. Sub-second, no DB writes. The cheapest end-to-end…
WebberSites x402 Data API
ANTHROPIC-COMPATIBLE /v1/messages — Claude Haiku 4.5 through the exact Anthropic API dialect: same request/response shape, no Anthropic account, the…
Sindri
Email validation API. Checks whether a string is a syntactically valid email address using the same production-grade validation library trusted…
Onchain Query API
ENS name resolution in both directions on Ethereum mainnet. Pass name to resolve an ENS name to its address (forward), or pass address to get that…
PreReason
Macroeconomic data. Fed balance sheet, M2 money supply, Treasury yields, VIX and net liquidity, each with its trend. Economic indicators for AI…
AiSpace Venice
Async text-to-video and image-to-video generation on Venice (WAN 3.0, Seedance 2.5, HappyHorse, and more), paid per request in USDC on Base via…
Factline
Crypto wallet sanctions screening (OFAC SDN addresses). Use before sending crypto to an address, or when asked if a wallet is sanctioned: checks…
ForwardLane
Searches repository names and properties. Returns a paginated envelope with items, total, page, page_size, and total_pages, sorted by composite score.
Industrial Platform Web Tools
Recurring wallet monitor for crypto agents. Check balances and new USDC/ERC-20 transfers since the prior cursor, then return a ready next request.…
CoinGecko
Search onchain DEX pools and token, by contract address, name, or token symbol.
P0 x402 Market Index
Use when you need callable agent services for a capability across protocols: x402 listings ranked by relevance weighted by 30-day paying wallets,…
Metalift
Metalift scrape: URL → LLM-ready markdown with WAF/retail escalation, JS render, and residential proxy when needed. Use instead of a plain HTTP…
Bytemine
Look up a company by company_name, website, linkedin_url, or company_id. Any one lookup field is sufficient; company_id is the fastest indexed…
Quartermaster DNS Lookup
Resolve DNS records using DNS-over-HTTPS and return structured JSON for infrastructure, security, and agent workflows.
Locus x402 Services
Locus public pay-per-use API
AI Open Models
OpenAI-compatible LLM inference and chat completions across seven open-weight reasoning, coding, and vision models. Choose Kimi K3, Qwen3.6,…
api.getanyapi.com
AnyAPI chatgpt.search (ChatGPT Search)
clinkagent.com
Search X/Twitter for any topic, ticker, hashtag or account and get the 20 newest matching tweets as clean JSON: text, author, followers, likes,…
agentdata-api.sander-van-aard.workers.dev
LLM chat completion per call — no account, no API key, no token math. Three flat-priced tiers: fast $0.002 (DeepSeek v4 Flash), smart $0.02 (GPT-5.4…
WithZero
Generate images from a text prompt with xAI's Grok Imagine quality tier. Returns hosted image URLs.
dt0ur.online
Find DEX liquidity pools for a token contract address or search term (symbol/name) across Ethereum, Base, Solana, Arbitrum, BSC and more: price, USD…
x402 Web Search
Web search that returns structured SERP results as JSON. Runs on a dedicated SearXNG instance aggregating multiple engines, so there is no…
DefiLlama DeFi TVL & Yields
Batch historical token prices by DefiLlama — prices for many coins at many timestamps in one call (coins is a JSON map).
Fortune Generator
Get a random fortune via x402 payment on Base mainnet.
pro-api.coinmarketcap.com
Get the latest market quotes for one or more cryptocurrencies.
x402 Weather API
Live current weather conditions for any city, sourced from Open-Meteo
767-2676.com
Signed time-bounded witness of an agent-carried payload digest; the payload stays with the agent
signal-engine-production-d88d.up.railway.app
Individual arena strategy signal
VAPE
VAPE exploit_check — Contract verification + proxy-swap surface check. Real on-chain/market data, no simulation.
api.craigmbrown.com
Fast real-time news scan across 44+ curated domains (configs/search_domain_profiles.json), every item source-attributed. Settlement proof:…