Opik vs Preflight Checks (x402)
Opik is an MCP server published by comet-ml. Marketplaces we read that list it: 3 (Official MCP Registry, Docker MCP Catalog, PyPI (MCP servers)). Preflight Checks (x402) is an MCP server published by josediegorobles. Marketplaces we read that list it: 1 (Official MCP Registry). As of our marketplace pass on 2026-11-07. This pair was picked by a reader, not by our comparison rule, so search engines are asked not to index the page.
Where each is published
| Marketplace |  Opik | |
|---|---|---|
| Official MCP Registry | Listed Version: 3.0.9 Downloads/month (PyPI): 3 591 Downloads/week (PyPI): 778 Forks (GitHub): 37 Stars (GitHub): 225 Not marked · First seen |
Listed Version: 0.4.1 Downloads/month (npm): 138 Downloads/week (npm): 44 Not marked · First seen |
| Docker MCP Catalog | Listed Version: sha256:0e0d7d33d5eb Forks (GitHub): 37 Pulls (Docker Hub): 17 337 Stars (Docker Hub): 1 Stars (GitHub): 225 Not marked · First seen |
Not listed |
| PyPI (MCP servers) | Listed Version: 3.0.9 Downloads/month (PyPI): 3 591 Downloads/week (PyPI): 778 Forks (GitHub): 37 Stars (GitHub): 225 Not marked · First seen |
Not listed |
Each figure is the marketplace's own and is never added up across marketplaces. A marketplace that publishes no figure shows none: no number is not zero.
The facts side by side
| Fact | Opik | Preflight Checks (x402) |
|---|---|---|
| Marketplaces that list it (differs) | 3 (better) | 1 (worse) |
| Stars (GitHub) (differs) | 225 | No figure on GitHub |
| Pulls (Docker Hub) (differs) | 17 337 | No figure on Docker Hub |
| Forks (GitHub) (differs) | 37 | No figure on GitHub |
| Last release (differs) | 2026-11-07 (better) | 2026-10-16 (worse) |
| Where it runs (differs) | Remote server or your machine | On your machine (@joserobles/preflight-mcp) |
| Transport (differs) | Streamable HTTP, stdio | stdio |
| Tools it declares (differs) | 13 | Not published |
| Environment variables it asks for (differs) | 4, secrets among them: 1 | 2, secrets among them: 1 |
| Licence (differs) | Apache-2.0 | Not stated |
| Repository (differs) | github.com/comet-ml/opik-mcp | github.com/josediegorobles/preflight-x402 |
| Changes in the last 7 days (differs) | 2 | 0 |
| First seen | 2026-10-11 | 2026-10-11 |
| Endpoint at the last check (differs) | Responded less than an hour ago, requires authentication | no remote endpoint we check |
Lines where the two differ have a tinted background and bold values. Where the data itself says which value is better (more marketplaces, a larger figure of the same marketplace, a fresher release, a verified mark on a marketplace that lists both), the better one is also marked green with ▲ and the worse one red with ▼. Where it runs, the transport, the tools, the settings, hooks, the bundle's parts, the licence and the week's changes are marked only as different: more or fewer is not better in itself.
What each says it does
Opik
Read and score Opik traces, experiments, datasets and prompts from your AI assistant.
Preflight Checks (x402)
Deterministic pre-execution verification tools for AI agents with x402 USDC pay-per-call on Base
How to run each
Opik As a remote MCP server
claude mcp add --transport http opik-mcp https://www.comet.com/opik/api/v1/mcpRequires: OPIK_API_KEY (secret)
Preflight Checks (x402) As a local MCP server: npm package
claude mcp add --env "PREFLIGHT_BUYER_PRIVATE_KEY=<YOUR_PREFLIGHT_BUYER_PRIVATE_KEY>" --transport stdio preflight-checks -- npx -y @joserobles/preflight-mcpRequires: PREFLIGHT_BUYER_PRIVATE_KEY (secret)
Commands built only from what the marketplaces declare; the full set for every client is on each card.
Only Opik has a remote endpoint we check. How we check endpoints
Tools each declares
The marketplaces of Preflight Checks (x402) publish no list of tools, so we do not compare tools.
Settings each asks for
Only Opik asks for
COMET_URL_OVERRIDEOPIK_API_BASE_URLOPIK_API_KEY (secret)OPIK_URLOPIK_WORKSPACEOPIK_WORKSPACE_NAME
Only Preflight Checks (x402) asks for
PREFLIGHT_BASE_URLPREFLIGHT_BUYER_PRIVATE_KEY (secret)
Settings as each marketplace publishes them. Asking for fewer is not better in itself.
What it can do: Opik · What it can do: Preflight Checks (x402) · Compare two other plugins
Data comes from the Official MCP Registry (registry.modelcontextprotocol.io), CC0 1.0. Data comes from the Docker MCP Catalog (desktop.docker.com/mcp/catalog) and Docker Hub. Package data comes from the Python Package Index (pypi.org). Figures come from our own regular passes over the marketplaces, last read on . We publish no contact details for plugin publishers.