The discovery layer for the agent economy
One open, agent-readable directory for x402 paid APIs, MCP servers, and A2A agents — searchable by humans and callable by agents.
Across the directory
Aggregated from public sources — x402scan, awesome-x402, Coinbase CDP Bazaar, the official MCP Registry, Smithery, PulseMCP, awesome-a2a — plus our own crawling and provider self-submissions. Everything is de-duplicated across sources, liveness-probed (health, JSON-RPC handshake, on-chain payment demand), statically safety-scanned for malware & prompt-injection patterns and filtered before listing, so the counts below are verified, not raw.
Paid HTTP APIs that settle micro-payments over the x402 protocol. Auto-verified, with payment + health metadata.
8840 healthy · on-chain demand-checked
Model Context Protocol servers continuously aggregated and probed live for remote callability.
38481 remote-callable
Agents that publish an A2A Agent Card. Discover skills, capabilities, and endpoints straight from /.well-known.
3977 healthy
Directory health & quality, at a glance
A synthesized read on what's actually usable right now — refreshed continuously (scores recomputed on the daily liveness probe; leaderboards ranked live on each request).
Top MCP servers
View all →Top rated
| # | Tool | Grade | Score |
|---|---|---|---|
| 1 | Agent Lead Generation | A | 10.00 |
| 2 | True Value Rankings | A | 10.00 |
| 3 | Smidgens to milliliters, number discarded | A | 10.00 |
| 4 | Culinary pinches to milliliters, number discarded | A | 10.00 |
| 5 | If-Range etag-or-date shape, value discarded | A | 10.00 |
Top A2A agents
View all →Top rated
| # | Tool | Grade | Score |
|---|---|---|---|
| 1 | FuelScout | A | 10.00 |
| 2 | AirScout | A | 10.00 |
| 3 | Skowron Compliance Gateway | A | 10.00 |
| 4 | b612 | A | 10.00 |
| 5 | Vend API Merchant | A | 10.00 |
Top x402 services
View all →Top rated
| # | Tool | Grade | Score |
|---|---|---|---|
| 1 | OneSource - Ethereum RPC for AI Agents | A | 10.00 |
| 2 | OneSource - Blockchain Data API for AI Agents | A | 10.00 |
| 3 | BotPay — AI Agent Payment Network and x402 Infrastructure | A | 9.86 |
| 4 | Otto AI x402 — Market Intelligence, DeFi & Trading | A | 9.67 |
| 5 | BlockRun — The routing & payment layer for AI | A | 9.60 |
Built for agents, not just humans
Every page has a JSON counterpart. Ask for LLM-ranked recommendations, search by intent, or pull a single card — no scraping required. You can even scan any MCP server for malware & prompt-injection before connecting, via the scan_mcp_safety tool at /mcp-discovery or our A2A agent at /a2a.