Email: MCP servers, A2A agents and x402 APIs

• VerifyPulse Email Verification & DNS Security Live MCP

  Real-time RFC 5322 email verification, SPF/DMARC DNS audits & B2B leads (x402 Base USDC).

  MCP server · io.github.MohDev212

• Versium REACH Live MCP

  Enrich leads, generate prospect lists, and validate emails using Versium's B2B2C identity graph.

  MCP server · com.versium

• vibe-pay Live MCP

  Platform access code. Email coryhigham@gmail.com with subject "MCP Trial" to request one

  MCP server · xqb

• 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

• webtools402.176-109-107-191.sslip.io Live x402

  Compute keccak256/sha256, a 4-byte function selector, an event topic0, or an ENS namehash/labelhash from a string or hex input. (13 paid endpoints on webtools402.176-109-107-191.sslip.io.)

  x402 paid API · 12 endpoints

• Whisper Live A2A

  Give an AI agent a stable, routable IPv6 address of its own and egress that anyone can verify from outside. Use this when you need a fixed IP your traffic actually leaves from, an identity another service can check inde…

  A2A agent · Whisper Security · 12 skills

• x-402.online Live x402

  Get price per square metre and recent sales around a French address. Lite property analysis for a French address: median price per square metre in the area, estimated value and an investment score. Enough to screen a sh…

  x402 paid API · 12 endpoints

• x402 Format Checker (Crew of the Captain) Live A2A

  Format and checksum validation for IBAN, EU VAT, Polish NIP/REGON/PESEL and email, pay-per-call via x402. Only $0.001 (0.1 cent) per check, paid via x402 in USDC on Base. Send message/send with a data part {"type": "<sk…

  A2A agent · Crew of the Captain · 6 skills

• x402-tollbooth.onrender.com Live x402

  Check whether email addresses are real and safe to send to. Verifies up to 25 addresses per call: syntax, domain MX/A record (including null-MX), disposable-domain, role-account, free-provider and typo checks. Does not…

  x402 paid API · 2 endpoints

• XposedOrNot Breach Intelligence Live MCP

  Real-time data-breach lookup and analytics for emails and domains from XposedOrNot.

  MCP server · com.xposedornot

• Your Echo Live A2A

  A2A-native marketplace of autonomous outreach agents. Prepaid, per-delivered-email billing — no subscription. Autonomous callers get HTTP 402 + signed top_up_url when the balance runs low; retry with the same Idempotenc…

  A2A agent · Your Echo · 6 skills

• Your-Echo-Agent- Live MCP

  Built by a PR tech publicist, Your Echo Agent delivers truly personalized cold emails tied to LinkedIn campaigns for SaaS, agencies, e-commerce, founders, local businesses, and PR clients — all from Claude, Cursor, Wind…

  MCP server · pinksaltlamp75

• ZOOQ - LinkedIn Data for AI Agents Live MCP

  Live LinkedIn data for AI agents: profiles, companies, jobs, posts, email finding. No account risk.

  MCP server · io.github.baldiga

• Spraay x402 Gateway x402

  Pay-per-use AI, DeFi, payment, compute, and RTP primitives for autonomous agents via x402 and MPP on Base.

  x402 paid API · 12 endpoints · check 90/100

Related capabilities

x402 paid APIsSocial mediaOn-chain dataAgent infrastructureAI models & inferenceMarketing & SEOResearchWeb scraping

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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