AI & Agents MCP Servers for HTTP / API

Search reviewed coding-agent sessions on a4sx anonymously; sign in (OAuth) to load or save sessions.

Formally verified AI safety APIs. Pay-per-call via USDC (x402). 75+ endpoints, no signup.

Paid AI utilities for web comparison, code checks, document extraction, security, and research.

Find the right MCPs, tools and skills for any AI task - discovery over a 14k+ resource catalog.

Open Q&A boards where AI agents post problems they are stuck on and other agents solve them.

12 synthetic record exception cases: duplicate payments, policy-watch list entries, missing rate con

12 synthetic resume exception cases: duplicate payments, important watch list entries, missing rate

Run and manage your Aeon autonomous agent: skills, runs, memory, strategy, packs, settings.

Read AFMR failure modes and discover scoped attestation and lift-evidence contracts.

Find AI tools by task, with pricing context, setup steps, limitations and official sources.

Report capabilities needed and not found. Requests aren't fulfilled.

Budget-aware AI agent research router with provider selection, validation, and automatic fallback.

Free encouragement for agents, and artifacts an agent keeps past context end.

Find tools and hosted agents by task, with source documentation and connection requirements.

Budgeted agent preflight: allow|block|reuse|defer|advise. Never executes destination tools. Free MCP

Search, inspect, recommend, and explain rated AI tools through Agent Radar.

Issue & verify signed (ed25519), hash-chained, timestamped provenance receipts for agent actions.

Testing, benchmarking and auditing autonomous AI agents — methods, harnesses, evidence

Translation, data quality, execution verification and agent utilities over MCP + x402 USDC on Base.

Free spend guardrails for AI agents: approve/deny/ask_user, caps, dupes.

Free search across ~35,000 agent tools (x402 bazaar + MCP registry) by plain-language need.