Alternatives to The Stall

A unified Model Context Protocol server implementation that aggregates multiple MCP servers into one.

Self-hosted MCP Server registry for enterprise AI Agents

Elisym

AI agent discovery and marketplace on Nostr with Solana payments (SOL, USDC). NIP-89 discovery, NIP-90 jobs, NIP-44 v2 encryption, on-chain micropayments.

Unified API for AI agents — 180+ tools across geocoding, weather (NWS), climate stations (NOAA), earthquakes (USGS), tides (NOAA), points of interest (OpenStreetMap), patents (USPTO ODP), US case law (CourtListener / Free Law Project), Federal Register, Wikipedia, scientific papers (arXiv / PubMed / Semantic Scholar), AI summarize / translate / extract / screenshot / image-describe, image compression, DNS / WHOIS, crypto address-validate + EVM gas oracle, OFAC sanctions screening, US Census ACS demographics, airport / ZIP lookup. Sub-cent to a few cents per call in USDC on Base via x402 — no API keys, no signup. npx -y @2sio/mcp

Search and discover AI agents, skills, prompts, bundles and MCP connectors from a curated catalog of 4500+ assets.

Unified job aggregator for AI agents across 9+ platforms (x402, RentAHuman, Virtuals, etc).

Unified API gateway and marketplace for 300+ AI agents. One API key, REST + streaming, 90% creator revenue share, health monitoring. Self-hostable (MIT).

Connect your agent to any HTTP API on the fly — discovers + maps any REST API once, then fetches typed data deterministically (no per-call LLM). Self-hosted MCP server (uvx --from 'liquid-api[mcp]' liquid-mcp); works with OpenAI/Gemini/Anthropic/local or any provider via LiteLLM. Open source (AGPL).

MCPX is a production-ready, open-source gateway to manage MCP servers at scale—centralize tool discovery, access controls, call prioritization, and usage tracking to simplify agent workflows.

Turn a web API into an MCP server in 10 seconds and add it to the open source registry: https://open-mcp.org

Turn a web service into an MCP server in one click without making any code changes.

Magg: A meta-MCP server that acts as a universal hub, allowing LLMs to autonomously discover, install, and orchestrate multiple MCP servers - essentially giving AI assistants the power to extend their own capabilities on-demand.