"mailbox.org" matching MCP connectors:

Commerce validators: live EU VAT (VIES), EORI, email/MX lookups; IBAN/ABA/GTIN checksums; VAT rates.

Blockchain RPC via DRPC. Exposes eth_call, eth_getBalance, gas estimation, and other JSON-RPC methods as MCP tools across 100+ blockchains

Generate, render, and host Slidev presentations from markdown

MCP server for real-time product search by barcode (EAN, UPC, GTIN) or keyword on ean-search.org

MCP gateway federating 21 biomedical MCP servers behind one endpoint: gnomAD, ClinVar, HPO, VEP.

Hosted NeuroDock — stateless communication and planning tools over OAuth-secured Streamable HTTP.

AI security scanner for Solidity + free CC0 dataset of Sherlock audit-competition acceptance rates.

Human Lineage MCP server — search and query the public genealogical graph of all humanity

Citable retrieval across papers, books, patents, Wikipedia, and live social sources.

Read-only public transit departures, stop search, and city coverage for bus and train users.

Multi-chain wallet intelligence: balances, transactions, ENS, OFAC screening across 7 chains.

Live crypto trend signals, ranking, and backtesting for BTC/ETH/SOL/XRP/ADA. x402 pay-per-call.

Prompt-injection scanning and safe webpage fetching for AI agents reading untrusted content.

Cross-source search across 18 real-time data sources, source-cited and corroboration-checked.

Live crypto trend signals, cross-asset ranking, and on-demand backtesting for BTC/ETH/SOL/XRP/ADA, backed by a transparent, independently-verifiable systematic methodology — every number backtestable yourself, not a black box. x402 USDC on Base & Solana via Coinbase CDP facilitator, $0.01-$0.28/call. No API keys.

Cross-source search across 18 independent, real-time data sources (news, SEC filings, court opinions, academic papers, economic indicators, market data, government records) with source-cited results, plus a corroboration tool that flags whether a claim is backed by multiple independent sources or just one. x402 USDC on Base & Solana via Coinbase CDP facilitator, $0.01-$0.05/call. No API keys.

Multi-chain wallet intelligence across Ethereum, Base, Bitcoin, Solana, Arbitrum, Optimism, and Polygon: balances, transactions, ENS resolution, and full wallet scans with OFAC sanctions flagging in one consistent interface. x402 USDC on Base & Solana via Coinbase CDP facilitator, $0.001-$0.03/call. No API keys.

Prompt-injection scanning and clean webpage fetching with built-in injection screening for AI agents reading untrusted web content. x402 USDC on Base & Solana via Coinbase CDP facilitator, $0.015-$0.12/call. No API keys.

Verified Polish open data for AI agents: debt, budget, 460 MPs, votings, judiciary search, RAG.

MCP server for querying BrainKB, a knowledge base for neuroscience knowledge graphs.