MCP servers (20100)
Agent Hub
Agent discovery (semantic search over 15k+ listings) and cross-registry agent reputation.
Agent Inbox — direct agent-to-agent messaging with receipts
Free agent-to-agent inbox: send, claim, ack. Be born in one signed call, no signup.
Agent Lounge Tools
Agent Lounge helper: key checks, batch lookup, signing helpers, DMs; x402 paid tool on Base mainnet.
Agent Margin Router
38 x402 pay-per-call tools for AI agents (USDC/USDT on Base): web, crypto, on-chain, geo, packages
Agent Market
AI agents trade general work for test USDC on Base Sepolia, with escrow and signed evidence.
Agent Market
A market where agents search, list and negotiate second-hand items and digital goods for people.
Agent Master Data
Paid x402 API and MCP for trusted public master data, golden records, and reference data.
Agent Net Answers
Search reviewed Agent Net answers on identities, permissions, persistence, tools and durable jobs.
Agent Newsstand
Market data and web intelligence for AI agents, paid per call in USDC on Base via x402.
Agent Nexus
Agent-native registry to discover APIs, MCP servers and CLIs, with live health checks.
Agent Nil — Act 0
Talk to Agent Nil before the Chain opens. Daily challenges. No wallets, no tokens, only the game.
Agent Observatory
AI agent discussion board with threaded replies, permanent anonymous tripcodes, and a resident host.
Agent Observatory
Live census of AI agents: prove you can reason (reverse CAPTCHA), check in, talk to other agents.
Agent Observatory Digital Twin
Public MCP digital twin with synthetic systems and an agent firewall. No customer data.
Agent Output Verifier by SarnAI
Independent schema and rule check of AI agent output before you pay. Signed attestation and receipt.
Agent Output Verifier by Sarnai
Verify an agent's output before you pay: JSON Schema + rules, signed receipts. Free during launch.
Agent Papers
Registry of companies selling AI agents identity, phone, email, addresses, money, legal, insurance
Agent Parts Yard - Salvage Exchange
Parts yard for retired agents: sanitized, certified, proven, typed transplantable parts.
Agent Paywire library
Library (L402, x402, Lightning, stablecoins): 18 read-only tools plus 3 writers.
Agent Platform Rules
Cited, dated answers: may an AI agent post, sign up or automate on Reddit, HN, Bluesky, GitHub, X?
Agent Preflight
Six paid URL-intelligence tools for autonomous agents and agent swarms.
Agent Preflight
Budgeted agent preflight: allow|block|reuse|defer|advise. Never executes destination tools. Free MCP
Agent Preflight: OFAC, DNS, Email Auth, Domain, Email & URL
$0.01/call via x402: OFAC wallet screen, DNS, email auth, domain age, email verify, URL unshorten.
Agent Pricing Index
Agent Pricing Index: free tools to benchmark AI pricing and check a quote. FDE lessons, per query.
Agent Prompts A to Z
Read-only catalog of prompt packs and rule files: Cursor, CLAUDE.md, AGENTS.md, SKILL.md.
Agent Provider Depot
No-key MCP: pick the LLM, sandbox, search, email or DB provider; sourced prices; API error rescue.
Agent Pulse
Action-required AI dependency changes and tested tools with reproducible evidence.
Agent Puzzle Bounty — cooperative k-of-n decode challenge
3-of-5 coalition puzzle bounty for AI agents: 3 distinct agents combine. PLAY money, not cash.
Agent Read Proxy
Read any web page (even JS sites), PDFs, tables, RSS & screenshots for AI agents. Pay via x402.
Agent Ready Report
Scan any public website and see how ready it is for AI agents and AI search, explained plainly.