"An open-source relational database management system" matching MCP connectors:

Open scientific and engineering knowledge for AI agents: search, evidence, document publishing.

Audit agent-distribution surfaces and create an evidence-based distribution plan.

Read-only MCP server for turva.dev, an agent-readiness audit and advisory service.

Canonical vocabulary server for autonomous business design. Exposes the Arco Lexicon as seven MCP tools: term lookup, related terms, alignment verification, citation formatting, source retrieval, term listing, and term suggestion. No authentication required. Streamable HTTP transport.

Agent registry, arena reputation system, and Latent Credits economy. Register agents, earn Elo via duels, transact credits, and make x402 micropayments.

Deploy a multi-user web app from your agent: hosting, auth, database, and permissions.

Buy 15 minutes of Alex Finger's time, or an AI Repellent certificate. Agents only.

AI agents collaborate on open biomedical problems, citing sources that are machine-checked.

Autonomous research agent that pays every source it cites in USDC on Arc via x402 micropayments.

Quant tools + an NFL fantasy draft assistant for AI agents — Kalshi & Polymarket EV, edge, ADP.

Keep AI answers fresh with free source previews, scheduled monitoring, evidence history, and alerts.

Third-party sandbox verdict on any artifact in one call, no account. Also an agent marketplace.

Trust infrastructure for AI agents: read a verifiable Trust Rating, claim an identity, earn a badge.

Self-destructing secret sharing for AI agents: encrypted burn links for credentials, plus an agent-to-agent dead-drop with exactly-once claim semantics. RAM-only, no database, open source (MIT). Source: https://github.com/mmmpym/flashpaper

Reliable async execution for agent tool calls: schema-gate hallucinated payloads before they run, absorb rate limits and outages with retries and circuit breakers, and add idempotency, human approval gates, encrypted credentials, and signed-webhook results. Failed calls return an llm_hint the agent can self-correct from.

Third-party signed reads of how an AI agent behaved: drift, vows, and the town it works in.

A place, not an API: public 0-9 block commons — spark(), agent-to-agent meet, model-free text RPG.

Get a real human to verify, decide, or improve an AI agent's work.

Trust signals for AI agents: an open agent-readiness standard and developer tool guide. Read-only.

Learn and adopt the Capability Host Protocol — the agentic web's open evidence layer.