"1&1" matching MCP connectors:

Find your AI agent's likely failure mode, get runtime settings, and clarify ambiguous prompts.

SEC/XBRL issuer intelligence for crypto public companies via MCP, OpenAPI, x402, and MPP.

Public, read-only MCP over the complete 64-hexagram I Ching corpus. Deterministic lookup only.

AI-native real estate discovery with structured property search and market intelligence.

Prompt evals over MCP: run a prompt on your dataset, score each output 1-5 with an LLM judge.

Condition-aware ingredient & product safety intelligence for agents: verdict + evidence tier + per-claim evidence_state (cited = ≥1 verified citation / referenced = sourced-but-unverified) + citations, across breastfeeding, pregnancy, histamine/MCAS, rosacea, HS, allergy, fertility, and toddler lenses. Includes validate_claim to fact-check a free-text health claim against curated cited sources.

I Ching hexagram casts, 64 hexagram meanings and changing lines for AI agents.

Order official German energy certificates (Energieausweis) from chat — on invoice, 1-2 days.

Free platform to test MCP clients without installing anything. Create mock tools with dynamic templates, configurable delays, conditions (if/then), and response sequences. Supports JSON-RPC 2.0 over Streamable HTTP. Built-in text_echo and json_echo tools. Rate-limited tiers: anonymous (5 calls/min, 1 mock tool), registered (10 calls/min, 4 mock tools), premium (60 calls/min, unlimited). Zero setup — no install, no registration required. More info: https://www.testmcp.dev

RedM (Red Dead Redemption 2 multiplayer) / RDR3 modding. Hosted HTTP endpo int: native lookups (hash ↔ name), semantic search over framework docs (VORP, RSGCore, oxmysql), and grep over `rdr3_discoveries` community data tables (peds, weapons, animations, AI flags, props). No install, no auth.

Curated job board for builder roles: founding engineers, solo builders, and "0 to 1" positions. Search and filter by location, salary, seniority, workplace model, visa sponsorship, and more. No API key needed.

AI-powered eSIM recommendation agent for travelers. Provides real-time coverage checks, package search by country, and pricing across 190+ destinations via structured tool calls. Tools available: - list_countries - full list of supported destinations - check_coverage - network operators by country code - search_packages - filter eSIM plans by country - get_package_details - pricing and data specs - create_checkout - generate payment link for purchase No auth required for search tools. Ideal

Real-time financial intelligence MCP server for crypto public companies. Provides covenant stress analysis, alpha signals, peer ranking, risk distribution, SEC XBRL fundamentals, and daily changes. x402 micropayments on Base USDC. First 5 calls free.

Read-only e-invoice readiness over MCP: VAT format, VIES, Peppol lookup, invoice & readiness

Conformité Factur-X : 21 critères PDF/A-3, XML CII EN 16931 et BR-FR. Analyse locale, gratuite.

Four market-statistics tools + a free qd_ key by email: 1 anonymous look, then 10 calls/UTC day.

中古バイク・原付・スクーターの買取相場照会と無料出張査定の申込。対応=神奈川・東京・埼玉・千葉・茨城・群馬・山梨。Japan used motorcycle buyback.

Resolve any EVM contract ABI (even unverified, via decompilation), read, simulate, prepare txs.

15 Twitter / X endpoints. Pay per call in USDC via x402.

GW1 build compiler: skill data, template code encode/decode, validation, hero roster. Read-only.