OpenZeppelin Solidity Contracts vs A2A Gateway — Base Token Guard & x402 Settlement
OpenZeppelin Solidity Contracts is an MCP server published by docker. Marketplaces we read that list it: 1 (Docker MCP Catalog). A2A Gateway — Base Token Guard & x402 Settlement is an MCP server published by a2a.musefish.trade. Marketplaces we read that list it: 1 (Official MCP Registry). As of our marketplace pass on 2026-11-13. 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 |  OpenZeppelin Solidity Contracts | |
|---|---|---|
| Docker MCP Catalog | Listed Version: not stated No figure published Not marked · First seen |
Not listed |
| Official MCP Registry | Not listed | Listed Version: 2.1.0 No figure published Not marked · First seen |
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 | OpenZeppelin Solidity Contracts | A2A Gateway — Base Token Guard & x402 Settlement |
|---|---|---|
| Marketplaces that list it | 1 | 1 |
| Last release (differs) | Not published | 2026-11-10 |
| Where it runs (differs) | Remote server (mcp.openzeppelin.com/contracts/solidity/mcp) | Remote server (a2a.musefish.trade/mcp) |
| Transport | Streamable HTTP | Streamable HTTP |
| Tools it declares (differs) | 8 | Not published |
| Environment variables it asks for | Not published | Not published |
| Licence (differs) | Apache-2.0 | Not stated |
| Repository | Not stated | Not stated |
| Changes in the last 7 days (differs) | 0 | 4 |
| First seen (differs) | 2026-10-11 | 2026-11-10 |
| Endpoint at the last check (differs) | Responded 11 h ago | Responded 20 h ago |
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
OpenZeppelin Solidity Contracts
Access to OpenZeppelin Solidity Contracts.
A2A Gateway — Base Token Guard & x402 Settlement
Free signup, 2 points, one command. Base token risk checks, route simulation, x402-paid.
How to run each
OpenZeppelin Solidity Contracts As a remote MCP server
claude mcp add --transport http openzeppelin-solidity https://mcp.openzeppelin.com/contracts/solidity/mcpA2A Gateway — Base Token Guard & x402 Settlement As a remote MCP server
claude mcp add --transport http a2a-gateway https://a2a.musefish.trade/mcpCommands built only from what the marketplaces declare; the full set for every client is on each card.
Both endpoints responded at the last daily check. How we check endpoints
Tools each declares
The marketplaces of A2A Gateway — Base Token Guard & x402 Settlement publish no list of tools, so we do not compare tools.
Settings each asks for
Neither one's marketplaces publish the settings it asks for.
What it can do: OpenZeppelin Solidity Contracts · What it can do: A2A Gateway — Base Token Guard & x402 Settlement · Compare two other plugins
Data comes from the Docker MCP Catalog (desktop.docker.com/mcp/catalog) and Docker Hub. Data comes from the Official MCP Registry (registry.modelcontextprotocol.io), CC0 1.0. Figures come from our own regular passes over the marketplaces, last read on . We publish no contact details for plugin publishers.