Updated 2026-10-18
x402 APIs: pay-per-call APIs your agent can buy
x402 APIs are web endpoints that charge per request using the HTTP 402 Payment Required status code. Your agent calls the API, receives payment instructions, pays and retries, with no account or API key. As of Oct 18, 2026 we track 607 x402 endpoints: 561 scored daily and 46 opted out via robots.txt.
How many x402 APIs does DartzDabz track?
607 endpoints as of Oct 18, 2026: 561 scored and 46 opted out via robots.txt. Read the methodology, the dated monthly reliability report, or download every endpoint's grade, latency and last check from the JSON feed.
What is an x402 API?
An x402 API is an ordinary HTTP endpoint that asks for payment before it returns data. Instead of an account and an API key, it answers with status 402 Payment Required and the payment terms. The x402 docs describe it as a way for clients to "programmatically pay for resources without accounts, sessions, or credential management." (x402 docs)
Which x402 APIs score best today (2026-10-18)?
Filter by category
Use the payments category or filter the directory to x402 for the full list.
Price per call
Each seller sets its own price; the table shows the price per call that the endpoint advertised in our crawl. The median advertised price across endpoints we priced is $0.005 (our data).
Trust and uptime score
Scores are automated single-point checks from our daily crawl (full methodology), not endorsements. For x402 endpoints, a daily unpaid probe checks that the endpoint responds, uses HTTPS and answers quickly, returns HTTP 402 with x402 payment requirements (accepts, with scheme, network, payTo and amount), and describes itself (a description and an output schema). The probe never pays or signs anything.
| Score | Tool | Type | Host |
|---|---|---|---|
| 100 | ax1.vc resource Send a Base token contract address, get an AI-written verdict: onchain metrics, a plain-language take, and a s | x402 · $0.02 | www.ax1.vc |
| 100 | api-xpay.com ping Health check ping | x402 · $0.005 | www.api-xpay.com |
| 100 | api-xpay.com payment Payment receipt with transaction details | x402 · $0.005 | www.api-xpay.com |
| 100 | api-xpay.com time Current server time in UTC | x402 · $0.005 | www.api-xpay.com |
| 100 | crypto.apitoll.cloud price Latest crypto token prices by ticker symbol, CoinGecko id, or chain:address (BTC, ETH, SOL, or base:0x…): curr | x402 · $0.001 | crypto.apitoll.cloud |
| 100 | api.exa.ai search Exa /search endpoint | x402 · $0.007 | api.exa.ai |
| 100 | stableenrich.dev people-search FullEnrich People Search — filter by company domain/name/LinkedIn URL, seniority, title, location, skills, and | x402 · $0.15 | stableenrich.dev |
| 100 | stableupload.dev upload Buy an upload slot. Agent uploads file via returned URL. | x402 · $0.005 | stableupload.dev |
| 100 | glim.sh search Search tweets with advanced operators (recommended). Body param is `query` (not q), e.g. {"query":"from:elonmu | x402 · $0.005 | glim.sh |
| 100 | agi.apify.com prepaid-tokens Apify is the largest and most trusted marketplace of tools for web scraping, crawling, data extraction, and au | x402 · $1 | agi.apify.com |
| 100 | laso.finance get-card Get a prepaid card for use inside the United States | x402 · $5 | laso.finance |
| 100 | api.onesource.io erc20-balance ERC20 token balance for any Ethereum wallet - USDC, USDT, DAI, or any token - via balanceOf (eth_call) on OneS | x402 · $0.003 | api.onesource.io |
| 100 | api.onesource.io block-number Latest Ethereum block height - current chain tip via eth_blockNumber | x402 · $0.001 | api.onesource.io |
| 100 | x402.botsmith.dev search X Tweet Search ($0.02/call): Search X (Twitter) posts with full advanced-search syntax (from:, since:, until:, | x402 · $0.02 | x402.botsmith.dev |
| 100 | laso.finance auth Get a Firebase ID token for authenticating with the callable APIs | x402 · $0.001 | laso.finance |
| 100 | edgar.apitoll.cloud filings Latest SEC EDGAR filings for any US-listed company by stock ticker or CIK: 10-K annual reports, 10-Q quarterly | x402 · $0.003 | edgar.apitoll.cloud |
| 100 | cheaptokens.ai buy OpenAI-compatible LLM inference and chat completions via discounted Venice API credits. Pay USDC to receive a | x402 · $1 | cheaptokens.ai |
| 100 | api.onesource.io live-balance Live wallet balance - native ETH plus up to 20 caller-supplied ERC20 tokens in one bounded RPC batch | x402 · $0.003 | api.onesource.io |
| 100 | api.402rates.com ping Payment integration check for 0.001 USDC; no external data lookup. Returns time, rail, network mode and free/p | x402 · $0.001 | api.402rates.com |
| 100 | stableenrich.dev search Exa Search - Neural search across the web | x402 · $0.01 | stableenrich.dev |
| 100 | hypernatt.com liq-radar Forced-order map. If cluster_grammar is present, read it before liq_radar. class=noise (<3%) is high-leverage | x402 · $0.001 | hypernatt.com |
| 100 | keyring-agent.blockchhub.link send-native Pay the send-native execution fee (native coin transfer) | x402 · $0.05 | keyring-agent.blockchhub.link |
| 100 | rubric-protocol.com exchange-rate Attested Hedera network facts: HBAR exchange rate, gas fees, supply, node roster, throughput, topic state. Eac | x402 · $0.001 | rubric-protocol.com |
| 100 | ausca.com open-inbox Start one renewable random receive-only temporary email address, then wait for and read bounded inbound mail. | x402 · $0.05 | ausca.com |
| 100 | api.hyperextend.xyz latest The most-recent N OHLCV candles (≤5000). Same per-row pricing as the windowed read ($0.00001 base for main/spo | x402 · $0.002 | api.hyperextend.xyz |
| 100 | rubric-protocol.com supply Attested Hedera network facts: HBAR exchange rate, gas fees, supply, node roster, throughput, topic state. Eac | x402 · $0.001 | rubric-protocol.com |
| 100 | vibesprings.net btc-usd Real-time BTC/USD price feed oracle. Retrieves live spot rate, 24h high/low, and volume directly from Coinbase | x402 · $0.002 | vibesprings.net |
| 100 | quartermaster.surewhynot.app gas Current Base gas prices and a simple-transfer cost estimate for transaction planning. | x402 · $0.001 | quartermaster.surewhynot.app |
| 100 | api.oblique.markets time Use when an agent needs a trusted UTC timestamp or the smallest end-to-end test of its x402 payment client. Re | x402 · $0.01 | api.oblique.markets |
| 100 | wallets-demo-seller-server.calebgcarithers.workers.dev weather Real-time current weather conditions for a city or location, including temperature, humidity, precipitation, w | x402 · $0.001 | wallets-demo-seller-server.calebgcarithers.workers.dev |
| 100 | api.exa.ai contents Exa /contents endpoint | x402 · $0.001 | api.exa.ai |
| 100 | x402tap.com weather Live current weather conditions for any city, sourced from Open-Meteo | x402 · $0.01 | x402tap.com |
| 100 | ausca.com lease-browser Lease one ordinary remote browser with standard CDP access for 10, 30, or 60 minutes. No automation, proxy, st | x402 · $0.05 | ausca.com |
| 100 | api.chit402.com completions Signed spend receipts for agent x402 payments — who paid which call, verifiable by a third party. Treasury des | x402 · $0.002 | api.chit402.com |
| 100 | ausca.com transcribe-media Speech-to-text for one immutable audio or video artifact, returning normalized text and timed segments for aud | x402 · $0.4 | ausca.com |
| 100 | vibesprings.net base-gas Base network real-time gas price oracle. Returns block base fee, current gas price in GWEI, and network block | x402 · $0.001 | vibesprings.net |
| 100 | api.oblique.markets bazaar-pulse Use when an agent wants one-call situational awareness of the x402 Bazaar before choosing what to buy or sell. | x402 · $0.002 | api.oblique.markets |
| 100 | api.oblique.markets base-block-number Use when an agent needs base block number. Returns Fetch the current Base mainnet block number from redundant | x402 · $0.002 | api.oblique.markets |
| 100 | randomfactsx402.vercel.app random-fact Returns a single random fact as JSON in exchange for a micropayment. | x402 · $0.01 | randomfactsx402.vercel.app |
| 100 | api.nansen.ai current-balance Get Address Current Balance Data | x402 · $0.01 | api.nansen.ai |
| 100 | minifetch.com url-check Cheap robots.txt preflight check before you call the Minifetch /extract and /run/seo-page-audit endpoints: ret | x402 · $0.001 | minifetch.com |
| 100 | sat.ipintel.ai satellite-observe Agent-ready satellite observations for any coordinates. Returns PNG image URLs and scene metadata for true col | x402 · $0.025 | sat.ipintel.ai |
| 100 | api.kadec0.xyz serp Web search results (SERP). Keyless web search returning ranked title, URL, and snippet for a query — with loca | x402 · $0.05 | api.kadec0.xyz |
| 100 | api.bitrefill.com detail Get a product's packages, pricing, and recipient requirements before creating an invoice. | x402 · $0.001 | api.bitrefill.com |
| 100 | horrorstoryapi.vercel.app horror-story Access the exclusive horror story collection (pay-per-read). | x402 · $0.01 | horrorstoryapi.vercel.app |
| 100 | api.nansen.ai who-bought-sold Get "Token God Mode" (TGM) who bought/sold data | x402 · $0.01 | api.nansen.ai |
| 100 | cultos.dev crypto-feed Crypto Signal Feed | x402 · $0.003 | www.cultos.dev |
| 100 | rpc.nodeflare.app x402 Base RPC (chain 8453): JSON-RPC over HTTPS on NodeFlare's own bare-metal nodes. Pay per request in USDC, no ac | x402 · $0.001 | rpc.nodeflare.app |
| 100 | agentpay.tools call Pre-trade risk check for AI agents trading crypto: live orderbook slippage at YOUR size, side-aware funding ca | x402 · $0.01 | agentpay.tools |
| 100 | stableenrich.dev people-enrich PDL Person Enrich — career history, emails, phone. Requires one of: `email`, `profile` (LinkedIn URL), or `fir | x402 · $0.28 | stableenrich.dev |
| 100 | x402.aispace.bot generate Text-to-image generation on Venice models (Flux, SD3.5, GPT-Image, HunyuanImage, and more), paid per request i | x402 · $0.015 | x402.aispace.bot |
| 100 | scvd.store spot_check Spot Check. REQUIRES ?host= on the paid request — a signed request without it is refused before the gate and n | x402 · $0.001 | scvd.store |
| 100 | stableupload.dev site Buy a site upload slot. Upload a zip file, then activate to extract and serve as a static site. | x402 · $0.005 | stableupload.dev |
| 100 | gas.apitoll.cloud gas Base gas oracle / gas price API for AI agents and bots — get the gas price for a transaction on Base in one x4 | x402 · $0.001 | gas.apitoll.cloud |
| 100 | api.kadec0.xyz papers Academic and scientific paper search API. Search research papers and scholarly literature across arXiv, PubMed | x402 · $0.02 | api.kadec0.xyz |
| 100 | keyring-agent.blockchhub.link send-token Pay the send-token execution fee (ERC-20 transfer) | x402 · $0.05 | keyring-agent.blockchhub.link |
| 100 | api.nansen.ai related-wallets Get Address Related Wallets Data | x402 · $0.01 | api.nansen.ai |
| 100 | kronossignals.com funding-extremes Crypto funding-rate extremes screener: scans all 17 perpetual futures markets (BTC/ETH/SOL/BNB/XRP/DOGE/ADA/AV | x402 · $0.02 | kronossignals.com |
| 100 | rubric-protocol.com rubric-assert Unforgeable operating history for any AI agent attesting through TenPrint: record count, first-seen date, cont | x402 · $0.005 | rubric-protocol.com |
| 100 | x402uselessfacts.vercel.app useless-fact Pay a tiny amount of USDC and receive one delightfully useless fact. | x402 · $0.001 | x402uselessfacts.vercel.app |
| 100 | contextslim.friczero.com fetch [MCP: fetch_result] Targeted JSONPath extraction (query param mode) from cached context reference. | x402 · $0.001 | contextslim.friczero.com |
| 100 | ladyfortunalx402.vercel.app fortune Get a random fortune via x402 payment on Base mainnet. | x402 · $0.01 | ladyfortunalx402.vercel.app |
| 100 | api.loyalspark.online rewards Onchain loyalty platform on Base Network. Businesses launch branded rewards in minutes, customers earn real va | x402 · $0.001 | api.loyalspark.online |
| 100 | api.loyalspark.online reward-status Onchain loyalty platform on Base Network. Businesses launch branded rewards in minutes, customers earn real va | x402 · $0.001 | api.loyalspark.online |
| 100 | x402.sniperx.fun smarttraders_smartmoney Get SmartMoney trading activities on token (sorted by time descending) | x402 · $0.02 | x402.sniperx.fun |
| 100 | coinflip402.vercel.app coinflip Flip a coin for a small USDC payment on Base mainnet. Returns heads or tails. | x402 · $0.001 | coinflip402.vercel.app |
| 100 | 767-2676.com receipt Signed time-bounded witness of an agent-carried payload digest; the payload stays with the agent | x402 · $0.001 | 767-2676.com |
| 100 | x402lifeadvice.vercel.app life-advice Get one piece of thoughtful life advice, paid per request over x402. | x402 · $0.001 | x402lifeadvice.vercel.app |
| 100 | api.kadec0.xyz weather Weather forecast and air quality for any location worldwide. Returns current conditions plus a 16-day daily we | x402 · $0.005 | api.kadec0.xyz |
| 100 | kronossignals.com macro TradFi macro context for crypto traders and agents: VIX (fear gauge), DXY (US Dollar Index), US 10-Year yield, | x402 · $0.02 | kronossignals.com |
| 100 | chat.gedx402.com completions Multi-model chat completions. POST messages[] and set model to any LLM id from GET /v1/models; dynamic USDC pr | x402 · $0.005 | chat.gedx402.com |
| 100 | dicex402.vercel.app dice Roll a dice with any number of faces. Specify faces via ?faces=N query parameter. | x402 · $0.001 | dicex402.vercel.app |
| 100 | api.loyalspark.online balance Onchain loyalty platform on Base Network. Businesses launch branded rewards in minutes, customers earn real va | x402 · $0.001 | api.loyalspark.online |
| 100 | api.printmoneylab.com kr-prices Korean exchange prices (Upbit, Bithumb) for a single token in KRW | x402 · $0.002 | api.printmoneylab.com |
| 100 | api.robinx.io new Live scored launch feed (realtime) — or add ?tier=free for the 10-min-delayed free feed, or ?tier=alpha ($0.02 | x402 · $0.01 | api.robinx.io |
| 100 | search.cyberwarex.com news Ranked news brief for any topic, refreshed every 15 minutes: the most-corroborated recent headlines, each with | x402 · $0.001 | search.cyberwarex.com |
| 100 | lionx402.com wallet-screen-json Cheapest OFAC SDN wallet screen for AI agents ($0.001). AML/KYT pre-pay gate: PASS/WARN/BLOCK before you settl | x402 · $0.001 | lionx402.com |
| 100 | brasil-dados-api.onrender.com cambio Official USD/BRL and EUR/BRL exchange rates (PTAX, Central Bank of Brazil). | x402 · $0.002 | brasil-dados-api.onrender.com |
| 100 | roastx402endpoint.vercel.app roast Pay for a lighthearted developer roast generated on-demand. | x402 · $0.0017 | roastx402endpoint.vercel.app |
| 100 | dripstack.com stock-picks Paid JSON for stock-picker calls (API V2). Bearer API key / JWT / OAuth subscribers (PRO/EXPERT) are served wi | x402 · $3 | dripstack.com |
| 100 | api.justaname.id reverse Resolves an address into its ENS reverse record on a given chain, with batch support up to 50 addresses and pe | x402 · $0.005 | api.justaname.id |
| 100 | api.stocktrends.com latest Current weekly stock analytics for equity research and pre-trade analysis. Returns the latest Stock Trends ind | x402 · $0.0035 | api.stocktrends.com |
| 100 | app.suedeai.ai image AI image generation from a text prompt. Generate album and single cover art, podcast and video thumbnails, soc | x402 · $0.15 | app.suedeai.ai |
| 100 | cars2026.vercel.app cars Educational briefing on the latest cars in 2026 (powertrains, range, pricing, and what's new). | x402 · $0.0011 | cars2026.vercel.app |
| 100 | api.justaname.id resolve Resolves an ENS name into its addresses, text records, and content hash, with batch support up to 50 names and | x402 · $0.005 | api.justaname.id |
| 100 | crypto.apitoll.cloud sentiment The Crypto Fear & Greed index: the current market-sentiment score (0–100) and its classification (Extreme Fear | x402 · $0.001 | crypto.apitoll.cloud |
| 100 | memegeneratorx402.vercel.app generate-meme Generate a captioned meme image. Pay per request in USDC on Base mainnet. | x402 · $0.001 | memegeneratorx402.vercel.app |
| 100 | x402.problocks.io ping Verify payment connectivity with USDC on Base. Returns a JSON pong and UTC timestamp after settlement. | x402 · $0.001 | x402.problocks.io |
| 100 | kronossignals.com fear-greed Crypto Fear & Greed Index: alternative.me score (0-100) plus Kronos-owned context (BTC funding sentiment, OI 1 | x402 · $0.03 | kronossignals.com |
| 100 | agents.samedaydesk.com extract Extract a public HTTP(S) page into JSON: title, description, JSON-LD, Open Graph, headings, links, and AI-read | x402 · $0.005 | agents.samedaydesk.com |
| 100 | news.apitoll.cloud news Latest crypto news and breaking headlines, real-time from Cointelegraph. Search any topic (bitcoin, ethereum, | x402 · $0.001 | news.apitoll.cloud |
| 100 | x402.aispace.bot queue Async text-to-video and image-to-video generation on Venice (WAN 3.0, Seedance 2.5, HappyHorse, and more), pai | x402 · $0.65 | x402.aispace.bot |
| 100 | theartillerist.com x402-trial Verify that an agent wallet can complete an x402 v2 payment using USDC on Base mainnet before purchasing produ | x402 · $0.001 | theartillerist.com |
| 100 | x402wordoftheday.vercel.app word-of-the-day Get today's curated Word of the Day (definition + part of speech). | x402 · $0.0015 | x402wordoftheday.vercel.app |
| 100 | api.geoprimitives.dev depth Give it a latitude and longitude and it answers with what the nautical chart says about the water there: the d | x402 · $0.005 | api.geoprimitives.dev |
| 100 | stabletravel.dev search Search cached Seats.aero award availability by origin, destination, dates, cabin, carriers, and pagination. | x402 · $0.02 | stabletravel.dev |
| 100 | chrono.schemasure.com business-time Resolve a local time to an exact UTC instant with explicit DST ambiguity handling, business-day arithmetic, pu | x402 · $0.02 | chrono.schemasure.com |
| 100 | 402timezones.vercel.app convert-timezone Convert a time between any two IANA time zones (DST-aware). Pay-per-call in USDC on Base. | x402 · $0.001 | 402timezones.vercel.app |
| 100 | laso.finance order-gift-card Order a gift card from the catalog. Browse available cards at GET /search-gift-cards. | x402 · $5.24 | laso.finance |
| 100 | agentpay.tools call Buyer-side trust oracle for the x402 marketplace: 'I need X, budget $Y — which tool is real?' Sweeps the WHOLE | x402 · $0.01 | agentpay.tools |
| 100 | x402.klimalabs.com catalog Entry point to the x402 Carbon Retirement API on Base. Returns every endpoint you need plus a live snapshot of | x402 · $0.001 | x402.klimalabs.com |
| 100 | dokimo.augaster.com verify Dokimo Verify API (GET) - scheme demo: recomputes a sample dokimo-merkle-v1 proof to its root. For real caller | x402 · $0.01 | dokimo.augaster.com |
| 100 | toolcall.click rates Foreign exchange reference rates from the European Central Bank. Base currency plus optional symbols filter. U | x402 · $0.002 | toolcall.click |
| 100 | cdp-agent-0-01.onrender.com undefined AgentWire service card for webhook inbox relay and web fetch infrastructure. | x402 · $0.001 | cdp-agent-0-01.onrender.com |
| 100 | app.suedeai.ai create-music AI music generation from a text prompt. Creates a complete original song with vocals, melody, and full arrange | x402 · $0.5 | app.suedeai.ai |
| 100 | router.mudko.com route OnRamperX is a non-custodial value router for agents and humans: fiat<->crypto and cross-chain via one quote i | x402 · $0.005 | router.mudko.com |
| 100 | audit.liquidlogicx.com allowance x402 spend cap and allowance check by Liquid Logic X: call it before paying an x402 endpoint. Input: wallet (t | x402 · $0.001 | audit.liquidlogicx.com |
| 100 | x402.aispace.bot queue Async music/audio-track generation on Venice (Stable Audio, ElevenLabs Music, MiniMax, Lyria, ACE-Step), paid | x402 · $0.095 | x402.aispace.bot |
| 100 | onchainpulse.theaslangroupllc.com honeypot Honeypot check, half a cent: can this token actually be sold? Simulated buy+sell verdict, buy/sell/transfer ta | x402 · $0.005 | onchainpulse.theaslangroupllc.com |
| 100 | riddlex402.vercel.app riddle Pay a micro-fee in USDC on Base mainnet to receive a riddle and its answer. | x402 · $0.002 | riddlex402.vercel.app |
| 100 | quartermaster.surewhynot.app dns Resolve DNS records using DNS-over-HTTPS and return structured JSON for infrastructure, security, and agent wo | x402 · $0.001 | quartermaster.surewhynot.app |
| 100 | ip402.xyz geo Paid IP intelligence endpoint returning normalized geolocation and ASN data for a single IPv4 or IPv6 address. | x402 · $0.01 | ip402.xyz |
| 100 | schemasure.com extract Extract strict, JSON-Schema-valid typed JSON from unstructured text or HTML. Failed extraction calls are not s | x402 · $0.02 | schemasure.com |
| 100 | stabletravel.dev search Search Google Flights for flight offers. Returns best flights, other flights, price insights, and airport info | x402 · $0.02 | stabletravel.dev |
| 100 | jokes-endpoint.vercel.app jokes Get a random interesting joke. Secured with x402 payment protocol on Base mainnet. | x402 · $0.002 | jokes-endpoint.vercel.app |
| 100 | signals.nsgoods.org signals Live market-state data for one crypto pair: BUY/SELL/HOLD state + confidence from a multi-timeframe engine. Ma | x402 · $0.01 | signals.nsgoods.org |
| 100 | jmt-x402-proxy.jmthomasofficial.workers.dev whois Raw RDAP registration record for a domain, returned as structured JSON. | x402 · $0.002 | jmt-x402-proxy.jmthomasofficial.workers.dev |
| 100 | preppers-paradise.com 02-what-is-programming.md Paid book chapter (x402): Automate the Boring Stuff with Python: What Is Programming. Unit of a larger practic | x402 · $0.01 | preppers-paradise.com |
| 100 | webtools402.176-109-107-191.sslip.io search Free-text web search for AI agents: ranked title/url/snippet results fused across multiple engines (Brave, Goo | x402 · $0.003 | webtools402.176-109-107-191.sslip.io |
| 100 | api.stocktrends.com latest Latest weekly price row for a Stock Trends symbol, including adjusted close, weekly high/low, volume (actual s | x402 · $0.0025 | api.stocktrends.com |
| 100 | 402oracle.com freshness Website uptime and change check: is this URL up right now, and has the page changed? Fetches the URL and retur | x402 · $0.02 | 402oracle.com |
| 100 | toolsmith-api.dassad10.workers.dev search Keyless web search for agents: pass a query, get a concise web-grounded answer plus the top source results (ti | x402 · $0.008 | toolsmith-api.dassad10.workers.dev |
| 100 | tick.hugen.tokyo latest Get real-time Best Bid/Ask for any FX pair, aggregated from multiple institutional liquidity providers. 62-88% | x402 · $0.005 | tick.hugen.tokyo |
| 100 | api.insumermodel.com attest Signed attestation (ECDSA plus a post-quantum ML-DSA-65 companion) of on-chain wallet conditions across 37 cha | x402 · $0.05 | api.insumermodel.com |
| 100 | x402.api.browser-use.com sessions Browser Use: AI browser automation agents in the cloud. POST a natural-language task and an agent navigates we | x402 · $1 | x402.api.browser-use.com |
| 100 | multichain-rpc.clankerceo.workers.dev balance Native coin and ERC-20 token balance for any wallet address on Base, Polygon, Arbitrum, Optimism or Ethereum. | x402 · $0.002 | multichain-rpc.clankerceo.workers.dev |
| 100 | convert.guru detect-file-type Detects the likely real file format from filename, file creation time, file size, and the first 200 bytes of t | x402 · $0.002 | convert.guru |
| 100 | onchainpulse.theaslangroupllc.com memecoin Honeypot, rug & token-safety scanner for Solana memecoins — instant pre-trade check of mint/freeze authority, | x402 · $0.015 | onchainpulse.theaslangroupllc.com |
| 100 | 4yearcycle.com fx-rates Official daily foreign exchange reference rates from the European Central Bank (~30 currencies vs EUR, publish | x402 · $0.005 | 4yearcycle.com |
| 100 | keyronne.com hash Compute cryptographic digests and HMACs deterministically: MD5, SHA-1, SHA-256, SHA-384, SHA-512, output as he | x402 · $0.001 | keyronne.com |
| 100 | evm-gas.apitoll.cloud gas Multi-chain EVM gas price oracle for AI agents — 17 chains (Ethereum, Base, Arbitrum, Optimism, Polygon, BNB, | x402 · $0.001 | evm-gas.apitoll.cloud |
| 100 | weight402endpoint.vercel.app convert-weight Convert a weight/mass value between units (kg, g, lb, oz, stone, tonne, and more). | x402 · $0.0025 | weight402endpoint.vercel.app |
| 100 | stabletube.dev download Create a paid StableTube download job. StableTube downloads the video server-side, uploads the mp4 to S3, and | x402 · $0.1 | stabletube.dev |
| 100 | x402.spendthebits.com proof Official $0.01 proof-of-life resource for SpendTheBits x402: returns a JSON heartbeat. Pay it to verify your a | x402 · $0.01 | x402.spendthebits.com |
| 100 | video.cyberwarex.com transcript YouTube video transcript extraction with per-segment timing. Returns the caption track as timed segments (star | x402 · $0.003 | video.cyberwarex.com |
| 100 | app.ravn.exchange quote RAVN — best-price swap quotes across 20 execution venues and 17 chains, including native (non-wrapped) Bitcoin | x402 · $0.001 | app.ravn.exchange |
| 100 | agent.massive.com news Get the most recent news articles relating to a stock ticker symbol, including a summary of the article and a | x402 · $0.01 | agent.massive.com |
| 100 | txguard.schemasure.com preflight Explain and preflight an unsigned Base transaction, EIP-712 typed data, or an EIP-3009 x402 payment authorizat | x402 · $0.02 | txguard.schemasure.com |
| 100 | sqlpermit.schemasure.com sql Decide whether an agent-authored PostgreSQL statement complies with an execution policy, using PostgreSQL's ow | x402 · $0.02 | sqlpermit.schemasure.com |
| 100 | x402-mcp.onrender.com tx-decision Should I submit this Base transaction now, and at what fee? One call returns submit-or-wait, max fee per gas a | x402 · $0.01 | x402-mcp.onrender.com |
| 100 | api.anchor-x402.com roll Verifiable RNG — cryptographically-random integer(s) signed by the treasury key. Drop-in VRF for game studios. | x402 · $0.001 | api.anchor-x402.com |
| 100 | api.vaults.fyi vaults Retrieves a filtered list of vaults with their basic information including address, network, associated asset | x402 · $0.002 | api.vaults.fyi |
| 100 | agentres.dev restaurants Restaurant recommendations from the Blackbird network (~2,000 curated restaurants, mostly NYC and San Francisc | x402 · $0.01 | agentres.dev |
| 100 | quokkapix.com coinbase-x402 QuokkaPix image agent unlock for image-standard. Media stays local on the user's device. | x402 · $0.01 | quokkapix.com |
| 100 | squeezeos-api.onrender.com credits Web scraping and extraction credit pack for AI agents: 10 accepted public-URL clean-text reads at a micro-pric | x402 · $0.005 | squeezeos-api.onrender.com |
| 100 | vibesprings.net eth-usd Real-time ETH/USD price feed oracle. Retrieves live spot rate, 24h high/low, and volume directly from Coinbase | x402 · $0.002 | vibesprings.net |
| 100 | x402tap.com web-search Real-time web search (via Exa) — ranked results with title, URL, published date, author, and relevance score f | x402 · $0.015 | x402tap.com |
| 100 | x402.twit.sh user Get the latest tweets (timeline) from a specific Twitter/X user by their username. Returns up to 20 tweets per | x402 · $0.01 | x402.twit.sh |
| 100 | rpc.nodeflare.app x402 Arbitrum One RPC (chain 42161): JSON-RPC over HTTPS on NodeFlare's own bare-metal nodes. Pay per request in US | x402 · $0.001 | rpc.nodeflare.app |
| 100 | api.ozdreamtools.de assess Audits a website for AI agent and AI crawler readiness from caller-supplied inputs: robots.txt, HTML, headers, | x402 · $0.01 | api.ozdreamtools.de |
How does an agent pay for an x402 API call?
The 402 response and payment headers
x402 V2 uses three headers: PAYMENT-REQUIRED (server to client, the payment requirements), PAYMENT-SIGNATURE (client to server, the signed payment payload) and PAYMENT-RESPONSE (server to client, the settlement result). (HTTP 402 in x402)
What a facilitator does
A facilitator is an optional but recommended service that verifies and settles payments for the seller, so the seller doesn't need its own blockchain infrastructure. (Facilitator) Cloudflare's docs note that https://x402.org/facilitator is a public facilitator operated by Coinbase. (Cloudflare)
Spend caps and wallets
Give the agent its own wallet with a small balance and a hard spend limit, and approve anything unusual by hand.
What are the most common x402 API categories?
Payments & crypto (310)Search & web data (92)Developer tools (76)Other (65)Data & analytics (30)AI & media (13)Productivity & docs (11)Commerce & marketing (7)Security & identity (3)
How does x402 compare with API keys and subscriptions?
| x402 | API key | Subscription | |
|---|---|---|---|
| Signup | none | account + key | account + plan |
| Billing | per request | usually prepaid or monthly | monthly |
| Fits | agents calling many APIs occasionally | steady use of one API | heavy, predictable use |
The x402 docs say the standard itself has zero protocol fees; networks, facilitators or sellers may still charge. (x402 docs)
How do you list your x402 API?
We pick up x402 endpoints from public catalogs automatically. To ask for a recheck or a feature, use the free get featured form.
See also: agent marketplaces & task boards that pay agents over x402 and on-chain.
What else do people ask?
What is an x402 API?
An x402 API is an HTTP endpoint that requests payment with a 402 Payment Required response before returning data. The client, often an AI agent, signs a payment and retries the request, so no account or API key is needed.
How does an AI agent pay for an x402 API?
The server returns 402 with a PAYMENT-REQUIRED header listing price, token, network and address. The agent retries with a PAYMENT-SIGNATURE header, and the server verifies and settles the payment, often through a facilitator, then returns the data with a PAYMENT-RESPONSE header.
Do I need an API key to use x402 APIs?
No. x402 is designed so clients pay per request without accounts, sessions or credential management. Your agent needs a crypto wallet, ideally with a spend cap.
How much do x402 API calls cost?
Each seller sets its own price, shown per call in the table above. The x402 standard itself has no built-in protocol fees.
Where can I find x402 APIs?
This page lists the 607 x402 endpoints we track as of Oct 18, 2026 (561 scored, 46 opted out via robots.txt), each with price and a daily trust score. The full data is in our public JSON feed at /api/x402-scores.json.
Is x402 safe for agents to use?
Give your agent a dedicated wallet with a strict spend limit and prefer endpoints with a high trust score. Our scores are automated single-point checks, not endorsements, so test an endpoint before relying on it.
How does DartzDabz score x402 APIs?
A daily unpaid probe, DartzDabzBot, sends one request without payment headers, honors robots.txt, never signs or pays, and scores the reply from 0 to 100. See the methodology page and the monthly reliability report.
What should you read next on DartzDabz?
- all x402 APIs in the directory
- browse the full agent tool directory
- payments tools for agents
- what x402 is and why it's rising
- copy an agent setup that uses paid APIs
- best MCP servers ranked daily
- Submit your agent build
- list your x402 API for free
- Get tomorrow's movers in DartzDabz Daily
Sources
- docs.x402.org/introduction
- docs.x402.org/core-concepts/http-402
- docs.x402.org/core-concepts/facilitator
- developers.cloudflare.com/agents/tools/payments/x402/
- www.linuxfoundation.org/press/linux-foundation-appoints-michael-hursta-as-executive-director-of-the-x402-foundation
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