X402 Discovery MCP vs Ddg Agent Payable Services
A side-by-side look at the X402 Discovery MCP and Ddg Agent Payable Services MCP servers: transport, auth, tools, quality signals, and the config to install either one in Claude, Cursor, Windsurf or VS Code.
Verdict: choose X402 Discovery MCP for aggregators work as a local process; choose Ddg Agent Payable Services for aggregators as a local process. You can also run both side by side in one mcpServers block.
Which MCP server should you choose?
Choose X402 Discovery MCP when
- You need dedicated capabilities in the Aggregators domain.
- You prefer a local stdio subprocess transport.
- Its auth model fits you: API key required.
- You want tools like
x402_discover, x402_health, x402_register.
Choose Ddg Agent Payable Services when
- You need dedicated capabilities in the Aggregators domain.
- You prefer a local stdio subprocess transport.
- Its auth model fits you: other.
- You have the keys it needs:
DDG_AGENT_ID, DDG_PRIVATE_KEY.
Feature & specification comparison
Rows where the two servers differ are marked.
| Spec | ||
|---|---|---|
| Category | Aggregators | Aggregators |
| Quality signal | 53/100 · Good | 53/100 · Good |
| Install command | Confirmed | Confirmed |
| Transport | Local subprocess (stdio) | Local subprocess (stdio) |
| Auth | API key required | other |
| Pricing | Freemium | Paid service |
| Required env vars | None listed | DDG_AGENT_IDDDG_PRIVATE_KEY |
| Verified owner | Community listing | Community listing |
| GitHub stars | 4 | 0 |
| Directory activity | 2 views 0 installs 0 upvotes | 4 views 0 installs 0 upvotes |
| Tools | 9 | Not listed |
| Full listing | View X402 Discovery MCP | View Ddg Agent Payable Services |
Tools & capabilities
X402 Discovery MCP tools 9
x402_discoverSemantic search across the live catalog by keyword, category, max pricex402_healthReal-time uptime + latency check for any registered servicex402_registerRegister a new x402 service (HTTPS-only, rate-limited)x402_attestERC-8004 trust score and reputation signals for a servicex402_scanFull x402 compliance scan: live config, trust score, mismatch detectionscout_routeDiscover best service for an intent + execute x402 paymentscout_discoverQuery discovery catalog without executingscout_executeExecute x402 payment to a known service URLscout_auditView agent spend log and budget status
Ddg Agent Payable Services tools
No tool names declared yet. Check the project README from the listing page.
Ready-to-paste client configs
Paste either block (or both) into your client config, e.g. claude_desktop_config.json or ~/.cursor/mcp.json. We only show a config when the install command is confirmed.
X402 Discovery MCP
{
"mcpServers": {
"rplryan-x402-discovery-mcp": {
"command": "uvx",
"args": [
"x402-payment-harness"
]
}
}
}
Ddg Agent Payable Services
{
"mcpServers": {
"daedalusdevelopmentgroup-ddg-agent-payable-services": {
"command": "uvx",
"args": [
"ddg-agent-services-mcp"
],
"env": {
"DDG_AGENT_ID": "YOUR_DDG_AGENT_ID_HERE",
"DDG_PRIVATE_KEY": "YOUR_DDG_PRIVATE_KEY_HERE"
}
}
}
}
Frequently asked questions
X402 Discovery MCP is categorized under Aggregators and uses a local stdio subprocess. Ddg Agent Payable Services belongs to Aggregators and uses a local stdio subprocess. Pick X402 Discovery MCP for aggregators work and Ddg Agent Payable Services for aggregators.
Copy the mcpServers block from the config section on this page into your client's config (for example claude_desktop_config.json or ~/.cursor/mcp.json), then fully restart the client.
X402 Discovery MCP is listed as freemium — a free tier with paid plans. Auth: api key required. Ddg Agent Payable Services is listed as a paid service. Auth: other. If a server needs environment variables such as API keys, define them under the env key in your client's MCP config.
Yes. MCP clients support multiple servers: add rplryan-x402-discovery-mcp and daedalusdevelopmentgroup-ddg-agent-payable-services as separate keys in the same mcpServers object, and your assistant will call tools from either one.
On AllMCPs, X402 Discovery MCP has a quality signal of 53/100 (Good) with 2 views, 0 installs and 4 GitHub stars. Ddg Agent Payable Services has 53/100 (Good) with 4 views, 0 installs and 0 GitHub stars.