AgentIndex
Search fifteen-thousand-plus MCP services, A2A agents, and x402 APIs across five registries before you commit to an integration stack.
Overview
AgentIndex is an MCP server for the Idea phase that searches 15K+ MCP services, A2A agents, and x402 APIs across five registries, paid via x402 USDC on Base.
What is this MCP server?
- Search 15K+ MCP services, A2A agents, and x402 APIs
- Aggregates five registries in one AgentIndex remote
- Paid access via x402 (USDC on Base)
- Hosted streamable HTTP at agentndx-production.up.railway.app
- Version 0.1.0 from agentndx GitHub repository
- 15K+ indexed MCP services, A2A agents, and x402 APIs
- 5 aggregated registries
- Payment via x402 (USDC on Base)
What problem does it solve?
Builders cannot find the right MCP or A2A service quickly because capabilities are scattered across too many registries.
Who is it for?
Solo builders in discover or scoping mode who need a wide catalog of MCP, A2A, and x402 APIs with crypto micropayment access.
Skip if: Teams that need a free offline registry mirror or want deep security audit reports without further due diligence.
What do I get? / Deliverables
You get unified search results from five registries so you can scope agent integrations with less manual hunting.
- Search hits across MCP services, A2A agents, and x402 APIs from five registries
- Shortlist inputs for validate scoping and build-phase MCP installs
Recommended MCP Servers
Journey fit
Discovery of external agent services belongs in idea/discover when you are still choosing what to plug into your build. Cross-registry search is the canonical discover shelf even when you revisit it during build tooling decisions.
How it compares
Cross-registry agent service search MCP, not a single-tool integration or Skillselion journey curator alone.
Common Questions / FAQ
Who is AgentIndex for?
Indie developers and agent authors comparing MCP servers, A2A agents, and x402 APIs before wiring them into a product.
When should I use AgentIndex?
Use it during idea discovery or validate scoping when you need to search 15K+ listings across five registries instead of manual registry browsing.
How do I add AgentIndex to my agent?
Add the remote MCP URL https://agentndx-production.up.railway.app (streamable-http) in your client and configure x402 USDC on Base payment per AgentIndex documentation.