Summarization & writing: MCP servers, A2A agents and x402 APIs

• AgentBIT API Live x402

  Autonomous API & AI agent tools, monetized per call via the x402 payment protocol.

  x402 paid API · 12 endpoints · 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

• Quartermaster Live x402

  Small, reliable utility APIs for AI agents. Paid endpoints charge per call in USDC over the x402 protocol (HTTP 402 flow) - no accounts, no API keys. Free endpoints are open.

  x402 paid API · 12 endpoints · check 89/100

• 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 · check 88/100

• 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 · check 88/100

• shelf.thirdmade.net Live x402

  Current transaction nonce for any address on Base or Ethereum. Agent tx bots need this before sending transactions. (21 paid endpoints on shelf.thirdmade.net.)

  x402 paid API · 12 endpoints · check 88/100

• trapcheck.dev Live x402

  Crypto token risk brief: price action, liquidity, supply dilution, and red flags, summarized in plain English. (2 paid endpoints on trapcheck.dev.)

  x402 paid API · 2 endpoints · check 88/100

• 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

• abi.cyberwarex.com Live x402

  Fetch a verified contract's ABI and metadata by address, keylessly, from Sourcify. Returns the ABI plus a summarized list of function and event signatures, the contract name and compiler, and proxy detection (is_proxy +…

  x402 paid API · 1 endpoint

• 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

• aiskills402.com Live x402

  Text to JSON: Extract Data Without Guessing — Extracts data from text into JSON that matches the shape you give (a JSON Schema, an example object or a list of fields), without guessing. Every value comes from the text;…

  x402 paid API · 12 endpoints

• erb-llm.com Live x402

  Privacy-first chat API: prompts run on a local open-weight model on dedicated hardware - your data is never forwarded to OpenAI/Anthropic or any third-party LLM cloud. OpenAI-compatible chat completions: summarize, draf…

  x402 paid API · 5 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

• kgninja.dev Live x402

  KG-NINJA Agent Error Fix Receipt (2 paid endpoints on api.kgninja.dev.)

  x402 paid API · 2 endpoints

• readability.openverbs.com Live x402

  Summarise a text's difficulty as a single consensus US grade level (averaging the five grade formulas), plus the Flesch Reading Ease, a plain-language difficulty band and an approximate age range. (4 paid endpoints on r…

  x402 paid API · 4 endpoints

• resolve402.dev Live x402

  Hiring signals of a company: open jobs read from its public ATS board (Greenhouse, Lever, Ashby, SmartRecruiters, Recruitee, Personio, Workable, Teamtailor, Workday), summarized as buying signals (volume, last 30 days,…

  x402 paid API · 9 endpoints

• touchstone.locomot.io Live x402

  Timelock encryption (tlock / encrypt-to-the-future): seal a payload toward a future drand round — undecryptable by anyone, including us, until that round lands; or open a landed seal. For sealed-bid auctions, commit-rev…

  x402 paid API · 12 endpoints

• webbersites.com Live x402

  ANTHROPIC-COMPATIBLE /v1/messages — Claude Haiku 4.5 through the exact Anthropic API dialect: same request/response shape, no Anthropic account, the x402 payment IS the auth. Point an Anthropic SDK's base_url at https:/…

  x402 paid API · 12 endpoints

• web.tollkit.dev Live x402

  PDF to text: give a PDF URL, get the text of every page with the title, author and page count. For RAG, research and summarizing reports, filings and papers. (6 paid endpoints on web.tollkit.dev.)

  x402 paid API · 6 endpoints

• x402-trends-server.onrender.com Live x402

  Scrape a public webpage and extract clean readable text. Use this web scraping endpoint when an AI agent needs page content for summarization, research, retrieval, content extraction, indexing, or downstream analysis wi…

  x402 paid API · 4 endpoints

Related capabilities

x402 paid APIsTranslationResearchDocuments & PDFsWeb scrapingVideo & audioMarketing & SEOAI models & inference

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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