Research: MCP servers, A2A agents and x402 APIs

• Apify Live x402

  Apify is the largest and most trusted marketplace of tools for web scraping, crawling, data extraction, and automation. Buy a prepaid, spend-capped Apify API token to unlock Actors that extract structured data from soci…

  x402 paid API · 1 endpoint · check 90/100

• AsterPay API Live x402

  Public API accepting x402 and MPP payments. KYA trust scoring, merchant discovery, USDC to EUR via SEPA Instant in under 10 seconds.

  x402 paid API · 12 endpoints · check 90/100

• Glassnode Live x402

  For finance professionals and institutions. Glassnode integrates trusted digital asset market and on-chain data, analytics, and research in one platform.

  x402 paid API · 12 endpoints · check 90/100

• LION Verified Company Data Live x402

  Keyless x402 on Base USDC for AI agents: cheapest OFAC wallet screen ($0.001), multi-list sanctions + signed compliance receipt, company research/org enrich from $0.03, verified company file $0.95. Live Wikidata+SEC+DNS…

  x402 paid API · 12 endpoints · check 90/100

• Mekler AI Live x402

  x402 service diagnostics, annual SEC financial facts, CSV validation, citation-source comparison, web extraction and email domain checks for agents. Retrieve six annual US-GAAP USD fields by CIK with filing links, same-…

  x402 paid API · 8 endpoints · check 90/100

• Omni Terminal Live x402

  Modern Hyperliquid trading terminal and dashboard with live execution, AI news, liquidation analytics, trader data, and an IBKR stocks and options private beta.

  x402 paid API · 3 endpoints · check 90/100

• Pocket Network Agentic Portal Live x402

  Pay-per-call access to Pocket Network services. No account, no API key.

  x402 paid API · 12 endpoints · check 90/100

• Web Search & Data API (kadec0) Live x402

  Pay-per-call web search and web data for AI agents. Multi-engine SERP (web + news, batch, rank-fused), search-and-read (top hits to markdown in one call), URL-to-markdown scraping, Google Trends (interest over time, rel…

  x402 paid API · 12 endpoints · check 90/100

• aarn.space Live x402

  Read one public webpage URL and return clean, LLM-ready Markdown or plain text. Designed for AI agents that need webpage contents, RAG context, research or summarization. (2 paid endpoints on api.aarn.space.)

  x402 paid API · 2 endpoints

• agent-reader.agent-reader.workers.dev Live x402

  DNS lookup over Cloudflare DoH: query A, AAAA, CNAME, MX, NS, TXT, SOA, SRV, CAA or PTR records for any domain and get structured JSON answers with TTLs. Useful for domain research, email validation and infrastructure c…

  x402 paid API · 3 endpoints

• agentforge-taupe.vercel.app Live x402

  Payment flow verification for agents integrating x402: confirms your wallet and payment channel work before you spend on a real endpoint. Category: infra. (19 paid endpoints on agentforge-taupe.vercel.app.)

  x402 paid API · 12 endpoints

• agentindex.world Live x402

  Fresh operational audit of any public agent or paid API: reachability, latency, HTTP status, x402 challenge, price/network/payTo, OpenAPI, agent card and MCP manifest. Returns a 0-100 score, verdict and issues. Try GET…

  x402 paid API · 12 endpoints

• agentreader.dev Live x402

  DNS lookup over Cloudflare DoH: query A, AAAA, CNAME, MX, NS, TXT, SOA, SRV, CAA or PTR records for any domain and get structured JSON answers with TTLs. Useful for domain research, email validation and infrastructure c…

  x402 paid API · 8 endpoints

• agentwholesale.vercel.app Live x402

  Search the live web for current information. Returns fresh structured organic search results with titles, URLs, snippets, domains, and ranks for agent research and retrieval. (2 paid endpoints on agentwholesale.vercel.a…

  x402 paid API · 2 endpoints

• almanac.locomot.io Live x402

  Deterministic citation formatter — APA 7, MLA 9, Chicago 17 author-date, BibTeX. From structured fields, returns the reference entry (markdown/html/plain) + the in-text citation, reproducing published style-manual examp…

  x402 paid API · 1 endpoint

• apiacre.com Live x402

  Read the latest Base mainnet block and a bounded EIP-1559 fee history in one RPC batch, including gas utilization and priority-fee percentile samples. (40 paid endpoints on apiacre.com.)

  x402 paid API · 12 endpoints

• builtwith.com Live x402

  Return BuiltWith technology detections and metadata for one domain. Useful for company research, stack analysis, competitive intelligence, and sales qualification.

  x402 paid API · 1 endpoint

• carbon-cashmere.de Live x402

  Recent Kaspa blocks (max 144 per call = $1.44 cap). Optional chain_only flag to filter selected-parent chain blocks. AI agent API for backtesters and indexers. Informational research data — not investment advice. (18 pa…

  x402 paid API · 12 endpoints

• citepulse.theaslangroupllc.com Live x402

  Single-paper lookup by DOI or title for research agents — citation count, influence, open-access status with a direct legal-OA link (Unpaywall), venue, and a TLDR. Deterministic passthrough over OpenAlex + Semantic Scho…

  x402 paid API · 2 endpoints

• companylens.ve1iko.chatgpt.site Live x402

  Resolve a UK legal company name or registration number to a sourced Companies House profile. Returns company status, incorporation, SIC codes, registered office, filing due dates and overdue flags. Use for company resea…

  x402 paid API · 1 endpoint

• concordancehq.duckdns.org Live x402

  Full-text search across every aggregated data source in one call: news, SEC filings, court opinions, academic papers, government records, and developer discussions. One query surfaces everything concordant across indepe…

  x402 paid API · 4 endpoints

• context-relay.contextrelay.workers.dev Live x402

  URL-to-Markdown web extraction and context compression for AI agents. Fetch a public web page and return clean, task-relevant, citation-verifiable LLM context with exact excerpts, locators, hashes, and estimated tokens…

  x402 paid API · 1 endpoint

• craigmbrown.com Live x402

  Fast real-time news scan across 44+ curated domains (configs/search_domain_profiles.json), every item source-attributed. Settlement proof: ProofOfSettledOutcome (kind 30120, data/proof_settled_outcomes.jsonl). The quick…

  x402 paid API · 12 endpoints

• darrylbots.com Live x402

  Darrylbots paid research: Standard Stock Screen: Quality, Momentum, and Durable Execution (3 paid endpoints on darrylbots.com.)

  x402 paid API · 3 endpoints

• domain-age-checker.underscoredone.com Live x402

  Send a list of domain names and this tool tells you exactly how old each one is, when it was first registered, when it expires, and how much time is left before expiration. Great for spotting brand-new suspicious domain…

  x402 paid API · 1 endpoint

• elements-live.com Live x402

  Lab quote: a filter query (+must -exclude "topic" (a OR b) wild* year:a..b) in; matching paper volume by year and research community, and a binding price per deliverable out. (8 paid endpoints on www.elements-live.com.)

  x402 paid API · 8 endpoints

• fetchharbor.benlab.download Live x402

  Fetch one public HTTP(S) URL for research, extraction, or agent workflows. Returns the final URL, upstream status, content type, and decoded content. Private, local, metadata, and reserved destinations are blocked; redi…

  x402 paid API · 3 endpoints

• google-trends.use.x402atlas.com Live x402

  Google Trends related search queries for a keyword by country — top & rising terms for SEO keyword research, query expansion and content ideas. (5 paid endpoints on google-trends.use.x402atlas.com.)

  x402 paid API · 5 endpoints

• grokzilla.shop Live x402

  Estimate whether text (or a web page's text) is AI-written, with signals and confidence band (22 paid endpoints on grokzilla.shop.)

  x402 paid API · 12 endpoints

• holdsup.app Live x402

  Published fact-checked episodes, newest first, with optional filters by category slug, show id or speaker slug. Paged. (2 paid endpoints on holdsup.app.)

  x402 paid API · 2 endpoints

• hydratrader.ai Live x402

  Summarize text. Classify sentiment. Rewrite. Extract keywords. Translate. When to use: cheap agent glue / probe steps for buyer-supplied text. Returns JSON for $0.01 per call in USDC on Base via x402. No API key. Local-…

  x402 paid API · 9 endpoints

• iposignal-dashboard-372lo399x-waltermelonlangs-projects.vercel.app Live x402

  Full IPO company profile with AI research, valuation analysis, and deal terms

  x402 paid API · 1 endpoint

• jmthomasofficial.com Live x402

  Company intelligence lookup: resolve a US-listed company ticker through the SEC EDGAR company ticker dataset. Returns CIK, ticker, and registrant name for company research, SEC filing discovery, and equity due diligence.

  x402 paid API · 1 endpoint

• k-data-x402-production.theblack1022.workers.dev Live x402

  Current USD/KRW exchange rate (ECB reference via Frankfurter, fallback open.er-api.com). (2 paid endpoints on k-data-x402-production.theblack1022.workers.dev.)

  x402 paid API · 2 endpoints

• 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

• 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

• 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

• 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

• money-mind-extract.onrender.com Live x402

  Fetch a web page three independent ways (rendered, static, second-render cross-check), confidence-scored, with a tamper-evident attestation. Refuses protected, login and CAPTCHA pages without charging. Use when your age…

  x402 paid API · 5 endpoints

• oracle.cyberwarex.com Live x402

  Cheapest identity taster ($0.001): feed it a 0x address or @handle, get back the input kind, a trust/credibility verdict, the top 3 red-flag signals, a one-line summary and an upgrade URL to the full /v1/identity/token…

  x402 paid API · 12 endpoints

• polymarket-signal-api.pwnker-polymarket-signals.workers.dev Live x402

  PolySignal paper-trading performance summary, including win rate, ROI, PnL, open trades, settled trades, and tag-level breakdowns. (2 paid endpoints on polymarket-signal-api.pwnker-polymarket-signals.workers.dev.)

  x402 paid API · 2 endpoints

• research.appliedidentities.com Live x402

  Three composite AI readiness scores with history

  x402 paid API · 1 endpoint

• research.halowerk.com Live x402

  Searches the official EU open data portal and returns datasets with what decides whether they are usable: the licence, classified by whether commercial reuse is allowed and what attribution or share-alike it demands. A…

  x402 paid API · 3 endpoints

• scopeapi.dev Live x402

  Generate text embeddings and semantic embedding vectors using OpenAI text-embedding-3-small for vector search, semantic similarity, clustering, retrieval, and RAG workflows. (12 paid endpoints on scopeapi.dev.)

  x402 paid API · 12 endpoints

• scout.hugen.tokyo Live x402

  11-source parallel intelligence report in one call — HN, GitHub, npm, PyPI, Dev.to, Hashnode, Lobsters, StackExchange, ArXiv, Semantic Scholar, GitLab. Best ROI on Bazaar. AI agent API for market research. Accepts USDC…

  x402 paid API · 12 endpoints

• scvd.store Live x402

  Spot Check. REQUIRES ?host= on the paid request — a signed request without it is refused before the gate and no money moves. Name a host and get what this observatory already holds on it, signed: corpus rounds and verdi…

  x402 paid API · 12 endpoints

• search.cyberwarex.com Live x402

  Web search that returns structured SERP results as JSON. Runs on a dedicated SearXNG instance aggregating multiple engines, so there is no per-engine API key, quota or HTML scraping to manage. Each result carries title,…

  x402 paid API · 5 endpoints

• search.openverbs.com Live x402

  Wikipedia summary API - the plain-language summary of the best-matching Wikipedia article for a topic or query, in any language. Returns the article title, short description, summary extract, thumbnail image and canonic…

  x402 paid API · 10 endpoints

Related capabilities

x402 paid APIsTrading & marketsLegal & complianceOn-chain dataWeb scrapingWeb searchAgent infrastructureMarketing & SEO

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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