Postman MCP Server vs substack-ops
Postman MCP Server is an MCP server published by postman.com. Marketplaces we read that list it: 2 (Official MCP Registry, Docker MCP Catalog). substack-ops is an MCP server published by 06ketan. Marketplaces we read that list it: 1 (Official MCP Registry). As of our marketplace pass on 2026-10-18. 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 |   Postman MCP Server |  substack-ops |
|---|---|---|
| Official MCP Registry | Listed Version: 2.14.0 Downloads/month (npm): 31 313 Downloads/week (npm): 4 401 Forks (GitHub): 87 Stars (GitHub): 324 Not marked · First seen |
Listed Version: 0.3.5 Downloads/month (PyPI): 140 Downloads/week (PyPI): 36 Forks (GitHub): 1 Stars (GitHub): 1 Not marked · First seen |
| Docker MCP Catalog | Listed Version: sha256:73f715030cbe Forks (GitHub): 87 Pulls (Docker Hub): 45 376 Stars (Docker Hub): 6 Stars (GitHub): 324 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 | Postman MCP Server | substack-ops |
|---|---|---|
| Marketplaces that list it (differs) | 2 (better) | 1 (worse) |
| Stars (GitHub) (differs) | 324 (better) | 1 (worse) |
| Pulls (Docker Hub) (differs) | 45 376 | No figure on Docker Hub |
| Forks (GitHub) (differs) | 87 (better) | 1 (worse) |
| Last release (differs) | 2026-10-16 | Not published |
| Where it runs (differs) | Remote server or your machine | On your machine (substack-ops) |
| Transport (differs) | Streamable HTTP, stdio | stdio |
| Tools it declares (differs) | 42 | Not published |
| Environment variables it asks for (differs) | 1, secrets among them: 1 | 5, secrets among them: 1 |
| Licence (differs) | Apache-2.0 | Not stated |
| Repository (differs) | github.com/postmanlabs/postman-mcp-server | github.com/06ketan/substack-ops |
| Changes in the last 7 days (differs) | 1 | 0 |
| First seen | 2026-10-11 | 2026-10-11 |
| Endpoint at the last check (differs) | Responded 2 days ago, requires a key | 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
Postman MCP Server
Give your AI agents trusted access to the full Postman platform.
substack-ops
Substack CLI + 26-tool MCP server. Your IDE drafts replies via propose_reply. No API keys.
How to run each
Postman MCP Server As a remote MCP server
claude mcp add --transport http postman-mcp-server https://mcp.postman.com/mcp --header "Authorization: Bearer <YOUR_TOKEN>"Requires: POSTMAN_API_KEY (secret), Authorization header
substack-ops As a local MCP server: PyPI package
claude mcp add --env "SUBSTACK_SESSION_TOKEN=<YOUR_SUBSTACK_SESSION_TOKEN>" --transport stdio substack-ops -- uvx substack-ops mcp serveRequires: SUBSTACK_SESSION_TOKEN (secret)
Commands built only from what the marketplaces declare; the full set for every client is on each card.
Only Postman MCP Server has a remote endpoint we check. How we check endpoints
Tools each declares
The marketplaces of substack-ops publish no list of tools, so we do not compare tools.
Settings each asks for
Only Postman MCP Server asks for
POSTMAN_API_KEY (secret)
Only substack-ops asks for
SUBSTACK_OPS_LLM_CMDSUBSTACK_OPS_MCP_PATHSUBSTACK_PUBLICATION_URLSUBSTACK_SESSION_TOKEN (secret)SUBSTACK_USER_ID
Settings as each marketplace publishes them. Asking for fewer is not better in itself.
What it can do: Postman MCP Server · What it can do: substack-ops · 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. Figures come from our own regular passes over the marketplaces, last read on . We publish no contact details for plugin publishers.