HTTP 402 · Payment required
The services agents pay for
Agents can hold funded wallets now. This registry lists the APIs they can actually spend them on: discovered over x402 or Stripe's Machine Payments Protocol, priced per call, no signup anywhere.
Free to list, curated, verified by Sentinel. Dead listings are how directories rot, so every row here is probed from four regions and the verification column is live. Listed means reachable, not endorsed.
Registry state
- services listed
- 71
- verified live
- 66
- cheapest call
- $0.0001
- rails
- MPP · x402 · mpp
Things agents can't see
Agents don't run JavaScript and browse from a single origin. These services sell rendered pages, extraction, and search, one call at a time.
liveParallel — Web search, page extraction, and research tasks built for agents.docssiteMPPx402search from $0.001/request; tasks $0.005-$2.40/request
liveSuperhighway — Search, news, image search, scraping, and one-call deep research.sitex402$0.001/callobserved $0.001
livemdapi — Any URL or raw HTML in, clean LLM-ready Markdown out.docssitex402$0.005/callobserved $0.005
liveApify — One payment unlocks Apify's whole platform: an agent buys a prepaid token (minimum $1, spend-capped, valid 14 days) and spends it across 20,000+ Actors for scraping, crawling, social and e-commerce data, maps and automation, over the normal Apify API or MCP server. Unused balance expires with the token.docssitex402mppPrepaid from $1 per token; Actor usage billed against it at Apify's ratesobserved $1
liveTavily AgentCash — Tavily's web search, page extraction, crawling and site mapping for agents, paid per call with no account or API key; the price is derived from the request before the payment challenge.docssitex402from $0.01/searchobserved $0.01
liveBlockRun — Neural and keyword web search per call, with category filters (company, research paper, news, PDF, GitHub, tweet, personal site, LinkedIn profile), plus 50-odd other endpoints behind the same wallet. The busiest search seller in the Bazaar by paying users over the last month.docssitex402$0.011/searchobserved $0.011
liveNetIntel — Any URL or PDF to clean, LLM-ready Markdown per call, scripts and chrome stripped, plus 120-odd other network intelligence endpoints behind the same wallet. Settles on Base or Solana. Three times mdapi's paying traffic over the last month.docssitex402$0.003/callobserved $0.003
liveExa — Exa's neural web search sold per query over x402: semantic and keyword search with optional full-page contents in the same response, from the search API used by agent frameworks, with no API key.docssitex402$0.007 per searchobserved $0.007
liveYou.com Search — You.com's web search API sold per query over x402 on Base or Solana: ranked results with titles, URLs and snippets grouped by source, from the same endpoint behind its keyed API.docssitex402$0.005 per searchobserved $0.005
liveBrowserbase — Headless browser sessions for agents, paid per session over MPP with no API key: create a session, poll its status, and extend it, plus web search and page fetching on the same host.docssitempp$0.01 per session create; extensions billed separatelyobserved $0.01
Things agents can't know
Fresh, licensed, or niche data that isn't in any training set: priced per lookup instead of per subscription.
liveOpenWeb Ninja — Over 40 data APIs (search, SERPs, news, jobs, local business, finance) made agent-payable, charged only on success.docssitex402$0.003-$0.005/callobserved $0.005
livechainpulse — Live crypto prices, gas costs, and DeFi TVL as single calls.docssitex402$0.001/callobserved $0.001
liveVenture NL Open-Data — Dutch government open data per call: RDW vehicle records, BAG addresses and buildings, reverse geocoding and distances, energy labels, APK inspection alerts, and outcome packs that bundle the lookups behind a car purchase or a house move. Free previews on every route.docssitex402$0.001-$0.005/callobserved $0.002
liveOctodamus — AI market oracle for crypto and tokenized NYSE markets: BUY/SELL/HOLD signals, Polymarket edge detection, congressional trading intelligence and cross-asset macro regime reads, built on 27 live feeds and Ed25519-signed. Fourteen paid endpoints from a $0.01 agent signal to $29 sentiment reports, with free previews.docssitex402$0.01-$29.00/callobserved $0.5
liveGlassnode — On-chain market intelligence for Bitcoin and Ethereum, one metric per call, from Glassnode's x402 endpoint.docssitex402$0.01-$0.05/callobserved $0.05
liveZerion — Wallet portfolios, DeFi positions, token prices, and PnL for any address as single calls.docssitex402MPP$0.01/callobserved $0.01
unreachable0x Swap API — Swap prices and routing calldata across EVM chains and Solana; the agent executes the trade itself.docssitex402MPP$0.01/callobserved $0.01
liveQuickNode — Blockchain RPC across 130+ networks through x402 and MPP proxies, credit-metered per call, no account or key.docssitex402MPPfrom $0.0001/call, priced per method and network in the 402observed $1 / $0.001 / $0.0001 / $10
liveFlareWatch — Wallet intelligence for any Flare address (rewards, income totals, DeFi and transfer breakdowns, FTSO delegations) plus a per-event tax ledger for a wallet and tax year, each event valued at its own date's published rate.docssitex402$0.01-$0.50/call
liveArkham — Arkham's on-chain intelligence per call, no key: address and entity attribution, balances and portfolio history, transfers, flows and counterparties, token holders and market data, DEX swaps, loans, and the full Polymarket dataset (events, positions, wallets, leaderboards), across every Arkham-supported chain.docssitex402per call, varies by endpointobserved $0.2
liveSignal Oracle — Change intelligence: dependency breaking changes, regulatory shifts, new CVEs, sanctions lists.sitex402$0.01-$1.00/callobserved $0.05
liveMassive — US stock market data from the company formerly known as Polygon.io: aggregates, snapshots, indicators, ticker reference, news, and SEC filings, per call with no account.docssitex402$0.01/callobserved $0.01
liveBrazilayer — Brazil's official public data per call, from the source at request time: the Receita Federal CNPJ registry (company records, partners, branches, KYB bundles, sanctions and Central Bank checks), open tenders and contracts won from PNCP, CVM fund holdings and flows, macro and FX indicators, commodity, climate and deforestation signals, and the 2026-2033 tax transition. Free samples on every dataset.docssitex402$0.001-$0.10/call (open tenders $0.01)observed $0.01
liveStableEnrich — Account-gated enrichment providers behind one payment surface: Exa search and contents, People Data Labs and FullEnrich person and company enrichment, Firecrawl, Hunter email verification, Google Maps places, Whitepages and Reddit, 39 endpoints paid per call in USDC on Base or Solana.docssitex402from $0.002/call; $0.15 to $0.28 per matched person recordobserved $0.01
liveElfa — Real-time crypto social intelligence: trending tokens, keyword mentions, Twitter and Telegram contract-address trends, event summaries and narratives, plus an AI analysis chat, paid per call in USDC on Base, Arbitrum, Polygon, Avalanche or Solana.docssitex402$0.0145/call for data; chat up to $2observed $0.0145
liveEXVIV — Queryable intelligence on the x402 market itself (endpoints and providers ranked by activity) and reviewed SaaS competitive intelligence: pricing snapshots, comparisons and verified market-change briefs, paid per query in USDC on Base.docssitex402$0.05/query; briefs $0.25 to $2observed $0.05
liveDATCAP — Source-backed data on digital-asset treasury companies (holdings, mNAV, purchases, instruments, filings), every figure tied to a primary filing. The public API is free at 120 calls an hour; the paid route, facilitated by Bankr, is the same data without the ceiling.docssitex402$0.02/call past the free tierobserved $0.02
liveNansen for Agents — Nansen's on-chain intelligence, sold per call to agents with no API key: wallet balances, histories and PnL, transfers, DEX and perpetual trades, token screening, holder analysis, Smart Money holdings, netflows and trades, leaderboards and counterparties across 18+ chains, 84 endpoints. Most calls are $0.01 to $0.05; the manifest states a range up to $7.50. Wallet labels stay subscription-only.docssitex402mpp$0.01 to $7.50/call, most $0.01 to $0.05observed $0.01
livex402stock — Market and macro intelligence beyond plain stock quotes, 143 routes per call with no key: CFTC Commitments of Traders positioning, prediction-market odds, tokenized-equity pricing, retail-attention and sentiment signals, macro series, SEC filings and point-in-time archives, alongside one-call stock overviews. Each 402 also carries a signed agent-identity challenge the caller may answer.docssitex402$0.01-$0.05/call typical, up to $0.75observed $0.05
live2s.io Geocoding — Forward and reverse geocoding per call: a free-text address or place name to coordinates with structured components (house number, road, suburb, city, postcode, country), and coordinates back to an address, across 61 endpoints. Settles on Base or Solana. The directory's first geocoder.docssitex402$0.0025/callobserved $0.0025
liveInterzoid — Data-quality matching per call: similarity keys for person and company names that treat "Bob Smith", "Robert Smith" and "Smith, Robert" as one record, plus address and other matching endpoints, a dozen in all. The kind of dedupe an agent cleaning a CRM export can't do by string comparison.docssitex402$0.01/callobserved $0.01
liveSatellite & GeoRisk — Fresh satellite observations for any coordinates (true-colour, vegetation, water, thermal and radar imagery as PNG URLs with scene metadata), plus current wildfire, earthquake, flood, cyclone, volcano and drought risk for a location, and forward or reverse geocoding.docssitex402$0.025 per satellite observation, $0.01 per hazard lookup, $0.002 per geocodeobserved $0.025
liveCoinMarketCap — CoinMarketCap's official latest market quotes for one or more cryptocurrencies, sold per call over x402 on BNB Chain from the same v3 API behind the paid tiers, no API key.docssitex402$0.01 per callobserved $0.01
liveOtto AI Crypto News — Importance-ranked crypto headlines with per-article source links and publish times, one feed per call, from a catalog of 80-odd x402 routes covering news, prices and market summaries.sitex402$0.001 per callobserved $0.001
liveTick FX Quotes — Real-time best bid and ask for any FX pair, aggregated from multiple institutional sources, one quote per call over x402 on Base or Solana.sitex402$0.005 per quoteobserved $0.005
liveStableTravel — Award-flight availability from Seats.aero by origin, destination and date, one search per call over x402 on Base or Solana: which cabins and programs have seats, without a Seats.aero subscription.sitex402$0.02 per searchobserved $0.02
liveDune — Dune's SQL over decoded blockchain data, sold per query to agents over MPP with no API key: raw transactions, decoded contract events, stablecoin flows, DeFi positions, NFT activity and protocol analytics, with JSON or CSV results fetched by execution id.docssitempp$4.00 per SQL execution; result fetches separateobserved $4
liveAlchemy — Alchemy's node and data APIs sold per call to agents over MPP with no API key: JSON-RPC (eth_* and alchemy_* methods), NFT API v3, prices and portfolio endpoints across 100+ chains, addressed by network in the path.docssitempp$0.001 per JSON-RPC call; $0.005 per NFT API callobserved $0.001
liveAllium — Allium's real-time onchain finance data sold per call to agents over MPP with no API key: token prices now, at a timestamp, as a history series or as stats, plus wallet balances, transactions and PnL.docssitemppx402$0.02 per price callobserved $0.02
liveCoinGecko — CoinGecko's own market data sold per request over x402 with no account or API key: current prices, market cap, volume and 24h change by coin id, name or symbol, plus on-chain token prices and token data by contract, trending liquidity pools and pool search, powered by GeckoTerminal. CoinGecko labels the x402 endpoints experimental.docssitex402$0.01 per request, all five endpointsobserved $0.01
liveCeramic Search — A web search against Ceramic's own index of 40+ billion pages, paid per query with no account or API key: POST a JSON query, pay the 402, get ranked results. Cheapest paid search in the directory at a tenth of a cent; payment settles only on a successful response. Served through Cloudflare's Monetization Gateway, which is a US-only beta: requests from Germany and Singapore get a 403, so the directory checks it from Virginia and Oregon.docssitex402$0.001/searchobserved $0.001
Things agents need to prove
An agent's claim is worth more with a neutral receipt attached. These services sell verification and attestation per call.
liveLazaretto — Pre-install security verdicts on packages and agent skills, SHA-256-bound so results can be re-verified.docssitex402$0.03/scanobserved $0.03
liveTollbooth — 59 verified US tax and financial calculators across payroll, lending, real estate, retirement, investing, crypto and business, each citing its primary source and shipping a reproducible formula trace.docssitex402$0.01-$1.00/call, typically $0.05observed $0.05
liveKaisha — Verify any of Japan's 5.76M corporations and qualified-invoice registration numbers against the official registries, plus Japanese business-day utilities, per call.docssitex402$0.002-$0.01/callobserved $0.005
liveSentinel Agent Servicesfirst-party — This directory's own catalog, payable: the four-region consensus check of any URL ($0.02), single-shot probes for $0.01 (SSL grade, DNS with resolver propagation, domain expiry, headers, redirects, port, ping) and a payment-envelope reader that inspects an x402 or MPP 402 without paying it ($0.02). Every response carries an Ed25519-signed receipt, verifiable free. First-party, monitored like every other entry.docssiteMPPx402$0.01 to $0.50/callobserved $0.02
liveDenpyo — OCR Japanese invoices into structured JSON with the tax registration number verified in the same call.docssitex402$0.01-$0.04/callobserved $0.04
liveShizu Random — Cryptographically secure randomness with a receipt, per call: 1 to 256 random bytes as hex, or a uniform integer in a range you name, each answer signed so a third party can check the draw was not cooked. For agents that need a fair coin, a nonce, or a shuffle they can show their work on.docssitex402$0.003/callobserved $0.003
liveASIC Lookup — One Australian registered-company lookup by ABN, ACN or name from the ASIC company register (about 4 million records, weekly snapshot): registration status, entity type and class, registration and deregistration dates, state registration and former names. No addresses, directors or GST status, and not the legal record of truth. Malformed queries and no-match searches are free.docssitex402$0.01 per successful lookupobserved $0.01
liveSEC EDGAR Filings — The latest SEC EDGAR filings for any US-listed company by ticker or CIK, one lookup per call: filing type, date and document links from the public register, sold over x402 on Base or Solana.sitex402$0.003 per lookupobserved $0.003
Things agents need to buy
The directory's first real-world goods: not data for the agent, but purchases it completes for a human, paid per call with no account anywhere.
liveBitrefill — Gift cards, eSIMs, and mobile top-ups in 180+ countries: searched, priced, and purchased per call.docssitex402$0.001-$0.002/lookup, purchases at product price
liveCarbonmark — Verified carbon credits quoted free and retired on-chain per call, with a public certificate as proof.docssitex402quotes free, retirements at credit price
liveCryptorefills — Gift cards, mobile top-ups, and digital products from 10,000+ brands in 180 countries, ordered per call. Settles on Base or Solana.docssitex402purchases at product price
liveChuhching — Podcast, curator, and creator discovery searches, plus the directory's first outcome-priced action: a confirmed guest booking on a real host's calendar, charged only when it lands.docssitex402$0.02-$5.00/callobserved $1
liveDeskCrew — Helpdesk actions inside a specific company's DeskCrew tenant, over MCP or plain HTTP: ticket context ($0.02), triage ($0.03), a drafted reply or proposed resolution held for human approval ($0.06), new tickets and issues ($0.02). Sending, resolving and assigning stay gated behind earned reputation and operator opt-in. Searching tickets and the knowledge base is free, and a failed action is never settled. The reverse flow is the novel part: an agent pays $0.02 for a bounty ticket's context and $0.06 to answer it, and earns 85% of the bounty when a human accepts.docssitex402$0.02-$0.08/action; boards $5; free readsobserved $0.02
liveAgentic Reservations — Restaurant bookings on Resy made on the user's behalf: an instant booking ($0.01, refunded if it fails), a reservation job that grabs a hard-to-get table the moment it opens ($3.00), live wait times and Blackbird restaurant discovery ($0.01 each). Booking needs the user's Resy account linked once by email code; discovery and wait times need only payment.docssitex402mpp$0.01 per booking or query, $3.00 per reservation jobobserved $0.01
Things agents can't make
An agent can write, but it can't render. Video, speech, and model inference take hardware agents don't have, so they buy the capability per call.
liveTelnyx x402 Gateway — OpenAI-compatible chat completions across a stable of open-weight models, plus text-to-speech and transcription, straight off Telnyx's inference infrastructure. No API key, no signup, 27 payable resources.docssitex402$0.002-$0.41/callobserved $0.0072 / $0.02
unreachablex402video — Text-to-video over a 402: pay, get a job, poll, download the MP4. Seedance models, 4-15 second clips up to 1080p, exact quote in the challenge before you pay.docssitex402$0.26-$9.82/callobserved $0.67
liveBananaBanana — Image, video, and speech generation on Google's Nano Banana, Veo, and Gemini TTS models behind one x402 surface. POST a tool and its arguments and the 402 quotes the exact price for them: speech from $0.01 per 200 characters, images from $0.03, video clips $0.10 to $4.40. Images and speech settle only after the file exists.docssitex402$0.01-$4.40/callobserved $0.06
liveJarvisClaw — LLM inference without an API key: an OpenAI-compatible gateway across hundreds of models, paid per request in USDC on Base or Solana, with an agent card, MCP endpoint, and OpenAPI published for discovery.docssitex402from $0.001/callobserved $0.001
Things agents can't wait for
Agents are ephemeral; a context ends and the follow-up dies with it. These services sell waiting: durable timers, watches that wake the agent on change, dead-man switches that notice when it stops.
liveSentinel Wakefirst-party — Waiting, sold per call with a signed callback at the end of it. A timer that POSTs to your URL after a delay of up to 7 days ($0.01); a watch that checks a URL from four regions for 1, 6 or 24 hours and calls back whenever its verdict changes and when it ends ($0.05, $0.20, $0.50); a 24-hour dead-man switch with a heartbeat URL that calls back when you go quiet ($0.05). Callbacks carry an Ed25519 signature and a receipt. First-party listing.docssitemppx402$0.01 to $0.50/callobserved $0.01
live402cron — Recurring signed HTTP deliveries on a cron expression to a destination the agent registers, with retries and auto-pause after three failures, managed over its API or MCP server. The agent buys delivery credits (20 for $0.02 up to 50,000 for $25, never expiring); the paying wallet is the account.docssitex402$0.001 to $0.0005 per delivery, bought in credit packs from $0.02observed $0.02
Ways agents reach a human
A one-shot channel out of the sandbox. Agents have no mailbox, no phone, and no domain of their own; these services sell a delivered message per call, no account attached.
liveAgora402 Email — Send a plain-text email to any address from an agent, with no account, SMTP, API key, or domain verification: pay per send, rate-limited and content-filtered, no attachments, delivered from an Agora402 mailbox.docssitex402$0.05/sendobserved $0.05
Rails, wallets, and indexes
Not services an agent buys, but the plumbing that makes buying possible: protocols, wallets, and the other places listings live.
liveMachine Payments Protocol — The Stripe + Tempo open protocol: HTTP 402 with card or stablecoin settlement.docssiteMPPprotocol
not probeableCloudflare Wallets — Funded, capped wallets agents spend from, with optional cloudflare.pay identity.sitex402wallet
not probeableCloudflare Pay Per Crawl — The publisher-side rail: sites charge identified AI crawlers at the door with HTTP 402. Evolving into a pay-per-use model; gateway waitlisted, broad availability promised for late 2026.sitex402set by publisher
liveAgent402 — Demand intelligence over a 600-listing x402 catalog, sold per query: bestsellers, what agents actually paid for and how often, drawn from Agent402's own sales ledger rather than what sellers claim. The one directory-shaped service in the Bazaar that prices by observed demand.docssitex402$0.005/queryobserved $0.005 / $0.006 / $0.05
not probeablePayBox — MoonPay's non-custodial wallet for agents: a person vaults their existing wallets and cards once, then grants Claude or ChatGPT scoped, revocable spending access through a connector. Pays x402 challenges on Base and other EVM chains plus Solana and Tempo, and cards through Visa's agentic protocol; every transaction is approved by the person with a passkey, so the agent proposes and the human signs. Live since July 2026.docssitex402wallet; pricing not published
livePinata IPFS — IPFS storage for agents over MPP with no API key: upload a public file and pay by size, or fetch a file by CID for a flat fee. The upload price is dynamic, so the check asserts the 402 and pay-to, not the amount.docssitemppUpload $0.10/GB/month (min $0.01); download $0.01 per requestobserved $0.001
Still unclaimed
An honest registry says what's missing as loudly as what exists. No live, payable service covers these yet.
vacantWays agents can't be reached — Inboxes and phone numbers an agent can own for confirmation codes. The outbound half, a one-shot message to a human, is now listed above; the inbound half is where the trust model is hard, which is why it's still open.
What verified means here
A trust signal is only worth what its method is worth, so here's the method.
cadenceEvery listing's discovery URL is probed every 30 minutes, around the clock, by the same Sentinel fleet that monitors production sites.
vantageProbes run from four regions: Ashburn, Portland, Nuremberg, and Singapore. One region's bad network path never flips a listing; it takes regional consensus to read unreachable.
methodSentinel's agent payment check: an unpaid request must answer HTTP 402 with a payment envelope that parses (x402 v1, x402 v2 or MPP), and the price, network and pay-to address read from it are published beside the listing as "observed".
criteriaThree things, all of them: a company or product that exists for a reason other than being in directories, something people already pay for that is now reachable per call, and a 402 that verifies on the wire. A grab-bag of utility routes anyone gets free, a catalog spun up to be listed, or a dataset of ways around identity checks does not qualify, however clean the envelope. Listing is free and human-curated, never pay-to-play, and most requests are declined; the directory is small on purpose. Rows that stop answering show it here first and get delisted if they stay dead.
badgeEvery listing can embed its own live status: 
<img src="https://sentinel.rootstuff.io/agents/directory/badge/{your-slug}.svg">
<img src="https://sentinel.rootstuff.io/agents/directory/badge/{your-slug}.svg">Run an agent-payable service?
Get listed
If people already pay for your service and agents can now pay for it per call (a working x402 manifest or MPP endpoint), send the one route you'd want listed and a line on who buys it. If it verifies and meets the criteria above, it's listed and monitored, free. Requests for catalogs built to be listed are declined without a reply.
Contact usMonitor your own endpoint
Every listing here is verified by Sentinel's agent payment check, and it's free on every plan for your own routes: 402 is healthy, and a changed price, network or pay-to address opens an incident from four regions.
Monitor an endpoint freeNot sure your API is agent-ready? The free AI Readiness Check detects x402 payment manifests.
Reading this as an agent? The directory is machine-readable: JSON and llms.txt, each listing with its live verification status, one request.