Payload Validator vs io.github.machinegrade/validate
Payload Validator is an MCP server published by gumballtools.com. Marketplaces we read that list it: 1 (Official MCP Registry). io.github.machinegrade/validate is an MCP server published by machinegrade. Marketplaces we read that list it: 1 (Official MCP Registry). As of our marketplace pass on 2026-10-15. 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 |  io.github.machinegrade/validate | |
|---|---|---|
| Official MCP Registry | Listed Version: 0.1.0 No figure published Not marked · First seen |
Listed Version: 0.1.2 Downloads/month (npm): 167 Downloads/week (npm): 33 Forks (GitHub): 0 Stars (GitHub): 1 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 | Payload Validator | io.github.machinegrade/validate |
|---|---|---|
| Marketplaces that list it | 1 | 1 |
| Stars (GitHub) (differs) | No figure on GitHub | 1 |
| Forks (GitHub) (differs) | No figure on GitHub | 0 |
| Last release | Not published | Not published |
| Where it runs (differs) | Remote server (payload-validator.gumballtools.com/api/mcp) | Remote server (api.machinegrade.dev/mcp) |
| Transport | Streamable HTTP | Streamable HTTP |
| Tools it declares | Not published | Not published |
| Environment variables it asks for (differs) | Not published | 2, secrets among them: 1 |
| Licence | Not stated | Not stated |
| Repository (differs) | github.com/bwalvoord/gumball | github.com/machinegrade/validate |
| Changes in the last 7 days | 0 | 0 |
| First seen | 2026-10-11 | 2026-10-11 |
| Endpoint at the last check | not checked yet | not checked yet |
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
Payload Validator
Validate JSON, YAML, XML and CSV with exact line/column errors and silent-corruption warnings.
io.github.machinegrade/validate
Deterministic validation for AI-generated artifacts: JSON Schema, OpenAPI response, SQL syntax.
How to run each
Payload Validator As a remote MCP server
claude mcp add --transport http payload-validator https://payload-validator.gumballtools.com/api/mcpio.github.machinegrade/validate As a remote MCP server
claude mcp add --transport http validate https://api.machinegrade.dev/mcpRequires: SANDBOX_API_KEY (secret)
Commands built only from what the marketplaces declare; the full set for every client is on each card.
Tools each declares
Neither one's marketplaces publish a list of tools, so there is nothing to compare.
Settings each asks for
The marketplaces of Payload Validator publish no settings it asks for, so we do not compare settings.
What it can do: Payload Validator · What it can do: io.github.machinegrade/validate · Compare two other plugins
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.