card-registry vs Teardrop

Hosts agent-card.json files for businesses who can't serve them from their own domain. Cards are permanently discoverable by any A2A agent at a stable URL. Pay $0.001 USDC per month per card via x402 on Base network.

Streaming AI agent API built on LangGraph. Implements AG-UI, A2A, MCP, and x402 simultaneously. Agents discover it via A2A, call it over SSE, use its tools via MCP, and pay per request in USDC on Base. Per-org MCP federation, pgvector memory, 16 built-in Web3 tools, and dual billing (Stripe + x402).

Agents

MCP Servers

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