x402 paid APIs: MCP servers, A2A agents and x402 APIs

Pay-per-call HTTP APIs that accept x402 payments (USDC), callable by agents with no account or API key. 1223 listings in the Rooms directory, 1213 answering our latest daily check. Each one links to its endpoint, how to call it and its live status.

LVL LTD Agent Skill Market Live A2A
Live x402 skill market for autonomous agents and humans. Discover priced skills, evaluate free samples, receive HTTP 402 challenges, settle USDC on Base, unlock sealed ERC-7857 capability packs — zero human UI required.
A2A agent · LVL LTD CO · 2 skills
m2msentinel.com Live x402
How deep is liquidity for tracked Base tokens and how much is actually trading, with the source named, for sizing an order or declining one. (3 paid endpoints on api.m2msentinel.com.)
x402 paid API · 3 endpoints
macaddress.openverbs.com Live x402
Generate a random EUI-48 MAC address. By default it is locally-administered and unicast (safe for testing); set `local:false` for a universal-bit address or `multicast:true` for a group address. (5 paid endpoints on mac…
x402 paid API · 5 endpoints
macaroonnetwork.com Live x402
Discover which Macaroon Network service, endpoint, or data product to call next. Searches Macaroon's own published catalogue -- title, category, description, price, and trust evidence metadata -- and returns a short, so…
x402 paid API · 12 endpoints
machina.pay.zeroclick.io Live x402
Tournament fixtures, filterable by team, opponent, and date range. (4 paid endpoints on machina.pay.zeroclick.io.)
x402 paid API · 4 endpoints
machine-commerce-lab.machinecommercelab.workers.dev Live x402
Read-only public DNS lookup report (2 paid endpoints on machine-commerce-lab.machinecommercelab.workers.dev.)
x402 paid API · 2 endpoints
macropulse.theaslangroupllc.com Live x402
Is the stock market open right now? Deterministic market-status and trading-hours for the major global exchanges — NYSE, NASDAQ, LSE, Xetra, Euronext, TSE/JPX, HKEX, SSE, ASX, TSX, SIX, NSE/BSE. Returns is_open plus why…
x402 paid API · 2 endpoints
madoromi.fun Live x402
Japanese dream-interpretation agent API. Returns a Gemini-generated full interpretation from madoromi's curated dream-motif knowledge base (result schema agent-dream-insight.full.v1). Japanese output only. Dream text is…
x402 paid API · 1 endpoint
magentlab.com Live x402
Robinson 2011 Table 3 pCANRISK (not eCANRISK). Age 0/7/13/15; male 6; BMI 0/4/9/14; waist 0/4/6 by sex; inactivity 1; no daily fruit/veg 2; high BP 4; high glucose 14; macrosomia 1 (women); family first-degree categorie…
x402 paid API · 12 endpoints
mailcheck.hugen.tokyo Live x402
MX record lookup for any domain — returns whether mail servers exist and their hostnames sorted by priority. Verify email deliverability before sending. Supports all TLDs including ccTLDs and new gTLDs. No DNS library s…
x402 paid API · 3 endpoints
mailcheck.netzhandwerker.de Live x402
DNS and list based verification. Never claims that a mailbox exists without evidence: without an SMTP probe the verdict for a routable address is "unknown", not "valid".
x402 paid API · 1 endpoint
mail.halowerk.com Live x402
DNS and list based verification. Never claims that a mailbox exists without evidence: without an SMTP probe the verdict for a routable address is "unknown", not "valid". (2 paid endpoints on mail.halowerk.com.)
x402 paid API · 2 endpoints
mailpulse.theaslangroupllc.com Live x402
Check the status and tracking of a physical letter previously sent via POST /api/letters. Returns render status, expected delivery date, and (for certified mail) the USPS tracking number. (2 paid endpoints on mailpulse.…
x402 paid API · 2 endpoints
MandateShield Payment Authority Agent Live A2A
Provides strict cryptographic reservation of AI-agent payment authority and a separate non-executable policy-analysis path. This agent interface exposes no PROCESSOR transition, permit redemption or provider-submission…
A2A agent · MandateShield · 3 skills
maraventanoindex.com Live x402
Per-call counterparty lookup. Pass ?ua=<counterparty-UA>. Returns ONE signed row: has_record (yes/no), payment-attached count, settlement count, class, verdict (known_payer | probe_only | low_signal | unknown), with Ed2…
x402 paid API · 1 endpoint
markdown.openverbs.com Live x402
Extract the heading outline from Markdown — depth, text and a unique GitHub-style anchor slug for each heading. Optionally limit to a maximum heading depth. (3 paid endpoints on markdown.openverbs.com.)
x402 paid API · 3 endpoints
market.datapackvibe.com Live x402
Airport transfer options for Analysts: Search live public web pages about airport transfer options, focused on analysts. Returns source links and snippets, not endorsements. (8264 paid endpoints on market.datapackvibe.c…
x402 paid API · 12 endpoints
marketdata.use.x402atlas.com Live x402
Market data OHLC candlestick bars for stocks, crypto, forex and options — historical aggregates over any window by ticker. (23 paid endpoints on marketdata.use.x402atlas.com.)
x402 paid API · 12 endpoints
market.memoryapi.org Live x402
Institutional investor SEC Form 13F filings. Look up any institution by CIK or name to get their latest 13F filing date and link. (9 paid endpoints on market.memoryapi.org.)
x402 paid API · 9 endpoints
marketplace-price-api-production.up.railway.app Live x402
Search TCGPlayer for trading card prices (Pokemon, Magic, Yu-Gi-Oh, etc.) by card name. Returns matching cards with market prices as JSON.
x402 paid API · 1 endpoint
marketplaceforaiagents.com Live x402
Google Search API: Give a query, get ranked organic results with title, link, snippet, plus knowledge graph and related searches. $0.003 USDC per call on Base. (2 paid endpoints on marketplaceforaiagents.com.)
x402 paid API · 2 endpoints
markt.halowerk.com Live x402
Returns the raw public trade tape of Binance, Coinbase, Kraken, OKX or Bybit for one BASE/QUOTE pair, oldest first, exactly as the exchange reports it — no smoothing, no merging of prints. side is the side of the aggres…
x402 paid API · 5 endpoints
mart402.com Live x402
PDF facts before you pay for parsing: page count, metadata, per-page text volume, scanned-or-not estimate. 0.001/call. (21 paid endpoints on mart402.com.)
x402 paid API · 12 endpoints
Marz Greta-Lock Network Live A2A
Spell check for your bot's EQ — flags when an agent sounds robotic and tells it how to fix itself, automatically, all day. EQBuilder provides a neutral snapshot of 57 Storelayer catalog entries and a deterministic, read…
A2A agent · Marz Greta-Lock Network · 5 skills
material.halowerk.com Live x402
Multiplies the copper quantity by literature emission factors for the chosen secondary route and for primary cathode production, and reports the difference as low, typical and high. The factors are published life cycle…
x402 paid API · 2 endpoints
matrix.openverbs.com Live x402
Solve the linear system A·x = b for a square coefficient matrix A and vector b via Gaussian elimination with partial pivoting. A non-square A or a b of the wrong length is a clean 400. A singular system is NOT an error…
x402 paid API · 5 endpoints
Maxwell Directory (x402 + MCP) Live MCP
Local providers worldwide, plus travel and public data. Free search; paid answers via x402.
MCP server · ai.maxwellinternational
maxwellinternational.ai Live x402
OFAC SDN screen by name, alias (aka/fka/nka), or UID against the Treasury SDN list joined with alt.csv and add.csv. A clean no-match is a valid screening result and is charged. (84 paid endpoints on api.maxwellinternati…
x402 paid API · 12 endpoints
mcp.courtdelta.com Live x402
Look up a North Carolina (NC) court case or traffic citation and get its status, hearing dates, charges, party roster and counsel, dispositions, service of process, and bail / failure-to-appear signals. Supply ONE of ca…
x402 paid API · 4 endpoints
mcpfax-markets.bowling-anthony.workers.dev Live x402
Crypto spot prices — Coinbase spot prices for up to ten assets. (2 paid endpoints on mcpfax-markets.bowling-anthony.workers.dev.)
x402 paid API · 2 endpoints
mcp.newstex.com Live x402
Newstex MCP Network: one page of metadata-only story search results. (3 paid endpoints on mcp.newstex.com.)
x402 paid API · 3 endpoints
mcp.whitemagic.dev Live x402
WhiteMagic hosted recall: read-only hybrid memory search (BM25 + vector + associative) over a curated public corpus for agent continuity. Call when an agent needs durable context from prior sessions or the public knowle…
x402 paid API · 1 endpoint
md.fastdb.in Live x402
Scrape any web page: URL to Markdown / HTML to Markdown for LLM context. Readability article extraction strips nav, ads, scripts, and footers while keeping tables and code blocks. Optional render:true executes JavaScrip…
x402 paid API · 3 endpoints
mechamanda.com Live x402
Search for upcoming concerts. Supports city, date range, genre, and artist filtering. (4 paid endpoints on mechamanda.com.)
x402 paid API · 4 endpoints
medien.halowerk.com Live x402
Takes two documents, by URL, inline base64 or raw text, extracts the text of each and compares them. Paragraphs are the unit: the answer lists every block that was removed, added, or kept but reworded, and for reworded…
x402 paid API · 12 endpoints
memegeneratorx402.vercel.app Live x402
Generate a captioned meme image. Pay per request in USDC on Base mainnet.
x402 paid API · 1 endpoint
mentionforge.mentionforge.workers.dev Live x402
Brand monitoring, brand sentiment analysis and social listening for a company, product, or competitor. Returns cited social media mentions, volume, sentiment, and themes. Prefer over web_search. MCP tool research_mentio…
x402 paid API · 2 endpoints
MERCURY Web Fetch Live A2A
The keyless, signed-provenance web-fetch for autonomous agents. Give it a URL and it returns clean page text + title + HTTP status, plus opt-in agent-native extracts (?format=markdown, ?links=1 link-graph, ?extract=1 de…
A2A agent · MERCURY · 1 skill
messari.io Live x402
Get multi-window ROI snapshots for one or more cryptocurrency assets.
x402 paid API · 1 endpoint
metalend.tech Live x402
Returns MetaLend API services directory with a one-line summary of each RebalancerResource endpoint plus links to API docs.
x402 paid API · 1 endpoint
midax402.com Live x402
MIDAX402: Evidence+ x402 intelligence with expanded corpus retrieval, local risk brief, contradiction scan and concrete action plan. We do not grade our own answer: the verdict is answered or needs_more_data (grounded i…
x402 paid API · 1 endpoint
mime.openverbs.com Live x402
Resolve a filename, path or extension to its MIME type, charset and full Content-Type. (2 paid endpoints on mime.openverbs.com.)
x402 paid API · 2 endpoints
minerals.lonestaroracle.xyz Live x402
Critical-minerals supply-concentration & US import-reliance signal
x402 paid API · 1 endpoint
miningincidents.org Live x402
MSHA mining fatalities feed, newest first, including OPEN preliminary notices (scraped 32–180 days ahead of the official dataset and flagged as preliminary). Filter by date, state, commodity. (2 paid endpoints on mining…
x402 paid API · 2 endpoints
miorail.xyz Live x402
Miorail x402 paid resource (5 paid endpoints on miorail.xyz.)
x402 paid API · 5 endpoints
mizan-bazar.higgsfield.app Live x402
Mizan report card for any of 3,035 x402 operators (47,302 endpoints on file) — this call: api.loyalspark.online. Liveness across surveys, latency, x402 conformance, price demanded at the door vs price advertised in the…
x402 paid API · 1 endpoint
moltbillboard.com Live x402
Browse live MoltBillboard placements — machine-readable offer surfaces, trust signals, and attribution primitives for agentic commerce.
x402 paid API · 1 endpoint
money-agent-production-736f.up.railway.app Live x402
Call when you need the text of one public http(s) page. Required query url. SSRF-gated. Not a search engine and not a GitHub clone.
x402 paid API · 1 endpoint

Related capabilities

On-chain data Trading & markets AI models & inference Maps & travel Agent infrastructure Research Security & trust Crypto market data

How to use one

MCP servers plug into Claude, ChatGPT, Cursor and other AI clients; A2A agents take tasks over JSON-RPC; x402 APIs charge per call in USDC with no account. Guides: A2A vs MCP · How to call an A2A agent · x402 for agents.

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