Qtcl MCP Server vs Spanlens
A side-by-side look at the Qtcl MCP Server and Spanlens MCP servers: transport, auth, tools, quality signals, and the config to install either one in Claude, Cursor, Windsurf or VS Code.
Verdict: choose Qtcl MCP Server for monitoring work over a hosted endpoint; choose Spanlens for monitoring as a local process. You can also run both side by side in one mcpServers block.
Which MCP server should you choose?
Choose Qtcl MCP Server when
- You need dedicated capabilities in the Monitoring domain.
- You prefer a remote HTTP/SSE transport.
- You want tools like
qtcl_create_wallet, qtcl_get_balance, qtcl_send_transaction.
Choose Spanlens when
- You need dedicated capabilities in the Monitoring domain.
- You prefer a local stdio subprocess transport.
- Its auth model fits you: API key required.
- You have the keys it needs:
SPANLENS_API_KEY.
Feature & specification comparison
Rows where the two servers differ are marked.
| Spec | ||
|---|---|---|
| Category | Monitoring | Monitoring |
| Quality signal | 48/100 · Fair | 59/100 · Good |
| Install command | Confirmed | Confirmed |
| Transport | Remote HTTP/SSE | Local subprocess (stdio) |
| Auth | Not declared | API key required |
| Pricing | Not declared | Free |
| Required env vars | None listed | SPANLENS_API_KEY |
| Verified owner | Community listing | Community listing |
| GitHub stars | 0 | 13 |
| Directory activity | 0 views 0 installs 0 upvotes | 4 views 0 installs 0 upvotes |
| Tools | 11 | Not listed |
| Full listing | View Qtcl MCP Server | View Spanlens |
Tools & capabilities
Qtcl MCP Server tools 11
qtcl_create_walletGenerate a new post-quantum wallet address + keypairqtcl_get_balanceCheck confirmed + pending balance for any addressqtcl_send_transactionSend QTCL with flat 1-qsat fee. Supports 256-char memoqtcl_get_transactionLook up any transaction by hashqtcl_get_chain_infoBlock height, mempool depth, oracle consensus statusqtcl_get_blockBlock by height or hash with quantum coherence metricsqtcl_get_recent_transactionsLast 50 txs, filterable by addressqtcl_get_quantum_metricsLive W-state fidelity, entanglement witness, lattice coherenceqtcl_get_oracle_registry5 Byzantine consensus oracles — stake, uptime, heartbeatqtcl_get_peersActive P2P peers and topology dataqtcl_get_priceLive QTCL/USD from Pyth Network oracle feed
Spanlens 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.
Qtcl MCP Server
{
"mcpServers": {
"qtcl-mcp-server": {
"url": "https://qtcl-blockchain.koyeb.app/mcp/sse"
}
}
}
Spanlens
{
"mcpServers": {
"spanlens-spanlens-2": {
"command": "npx",
"args": [
"-y",
"@spanlens/cli"
],
"env": {
"SPANLENS_API_KEY": "YOUR_SPANLENS_API_KEY_HERE"
}
}
}
}
Frequently asked questions
Qtcl MCP Server is categorized under Monitoring and uses a remote HTTP/SSE transport. Spanlens belongs to Monitoring and uses a local stdio subprocess. Pick Qtcl MCP Server for monitoring work and Spanlens for monitoring.
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.
Qtcl MCP Server has no declared pricing — check the project's own site. Spanlens is listed as free. Auth: api key required. 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 qtcl-mcp-server and spanlens-spanlens-2 as separate keys in the same mcpServers object, and your assistant will call tools from either one.
On AllMCPs, Qtcl MCP Server has a quality signal of 48/100 (Fair) with 0 views, 0 installs and 0 GitHub stars. Spanlens has 59/100 (Good) with 4 views, 0 installs and 13 GitHub stars.