io.github.JasonCZMeng/assay
NPM · ASSAY-ORACLE-MCP · SCANNED SEP 20
x402 service-quality oracle: check a service's paid-probe quality tier and score before paying it.
Available components
How this component scores in each security and reliability category. Every signal is checked automatically from public evidence about the published package, including repeated runs of it in an isolated sandbox, and we only credit what we can confirm. How we score → Why this is hard to score →
Supply Chain Security99
- No malware found by supply-chain analysis.Pass
- No known CVEs affecting this package version or its production dependencies.Pass
- No install/post-install scripts declared.Pass
- 31 of 114 dependencies flagged as unhealthy. View diagnostics → Partial
Provenance & Transparency45
- Source repository is publicly reachable at the declared URL. View diagnostics → Pass
- Provenance check failed: no build-provenance attestation is published. See how to fix → View diagnostics → Fail
- Clear OSI-approved license (MIT).Pass
- Actively maintained (last published 45 days ago).Pass
- Disclosure check failed: no security disclosure policy was found in the source repository. See how to fix → Fail
Schema Quality & AI Usability80
- AI-judged instruction clarity (excellent).Pass
- Tool/resource definitions use about 298 tokens (~74/item across 4 items; 4 tools + 0 resources), lean.Pass
- Usage-examples check failed: none of the tools include examples. See how to fix → Fail
Stability & Change Management100
- No destabilizing schema changes in the last 30 days.Pass
Tool Coverage100
- 100% of tools have a non-trivial description (not blank, and not just the tool's name).Pass
- 100% of tool parameters carry a description.Pass
Tool Safety100
- No prompt-injection markers were found in the server instructions, tool names or descriptions we captured.Pass
- We read all 4 captured tool definition(s), and no name or description among them implies an irreversible operation.Pass
- An AI judge read all 4 captured unit(s) of tool text and found none that tries to manipulate the model reading it.Pass
Capabilities100
- Implements a supported MCP spec version (2025-11-25); the latest is 2026-07-28.Pass
How do I install the io.github.JasonCZMeng/assay MCP server?
io.github.JasonCZMeng/assay runs locally as an npm package, launched with npx -y assay-oracle-mcp. Ready-made configuration for Claude, Cursor, VS Code, Codex and 5 more is on this page, copied from each client's own documentation.
npm · assay-oracle-mcp
claude mcp add jasonczmeng-assay -- npx -y assay-oracle-mcp
{
"mcpServers": {
"jasonczmeng-assay": {
"command": "npx",
"args": [
"-y",
"assay-oracle-mcp"
]
}
}
} {
"servers": {
"jasonczmeng-assay": {
"command": "npx",
"args": [
"-y",
"assay-oracle-mcp"
]
}
}
} codex mcp add jasonczmeng-assay -- npx -y assay-oracle-mcp
{
"$schema": "https://opencode.ai/config.json",
"mcp": {
"jasonczmeng-assay": {
"type": "local",
"command": [
"npx",
"-y",
"assay-oracle-mcp"
],
"enabled": true
}
}
} openclaw mcp add jasonczmeng-assay --command npx --arg -y --arg assay-oracle-mcp
mcp_servers:
jasonczmeng-assay:
command: "npx"
args: ["-y", "assay-oracle-mcp"] {
"McpServers": {
"jasonczmeng-assay": {
"Transport": "stdio",
"Command": "npx",
"Arguments": [
"-y",
"assay-oracle-mcp"
]
}
}
} assistant mcp add jasonczmeng-assay -t stdio -c npx -a -y assay-oracle-mcp
{
"mcpServers": {
"jasonczmeng-assay": {
"command": "npx",
"args": [
"-y",
"assay-oracle-mcp"
]
}
}
} Every change we have recorded for this component, newest first. Security-relevant changes are always shown. ▲ marks a change for the better, ▼ a change for the worse; unmarked changes are neutral.
- 20 Sept 26 0
- Stability: 0.97 → pass security
- 19 Sept 26 +1
No change was recorded against any check on this day. Stability & Change Management went from 93 to 97. That category is still filling its 30-day observation window: 28 days of observed history at the previous scan, 29 at this one. The score rises as the window fills, whether or not the server changes.
- 17 Sept 26 +1
No change was recorded against any check on this day. Stability & Change Management went from 87 to 90. That category is still filling its 30-day observation window: 26 days of observed history at the previous scan, 27 at this one. The score rises as the window fills, whether or not the server changes.
- 15 Sept 26 +1
No change was recorded against any check on this day. Stability & Change Management went from 80 to 83. That category is still filling its 30-day observation window: 24 days of observed history at the previous scan, 25 at this one. The score rises as the window fills, whether or not the server changes.
- 13 Sept 26 −3
- Stability: pass → 0.77 functional
- 12 Sept 26 0
- Stability: 0.97 → pass security
- 11 Sept 26 +1
No change was recorded against any check on this day. Stability & Change Management went from 93 to 97. That category is still filling its 30-day observation window: 28 days of observed history at the previous scan, 29 at this one. The score rises as the window fills, whether or not the server changes.
- 9 Sept 26 +1
No change was recorded against any check on this day. Stability & Change Management went from 87 to 90. That category is still filling its 30-day observation window: 26 days of observed history at the previous scan, 27 at this one. The score rises as the window fills, whether or not the server changes.
Diagnostic detail from the automated scan of this channel: what the scanner observed at each step, so you can see exactly where a check passed or failed. It is informational only and never changes the trust score.
Captured 20 Sept 2026 · Analysed npm/assay-oracle-mcp@0.2.0
Provenance No attestation
The registry publishes no build provenance for this version, so there is nothing to verify.
| Result | No attestation |
|---|---|
| Ecosystem | npm |
Background: How many MCP packages publish verified provenance →
Dependencies 114 packages
| Packages resolved | 114 |
|---|---|
| Stale | 31 |
| Tree resolution | Complete |
Background: SBOMs and build attestations, explained →
The tools this component advertises to a client, with an estimated token cost for each. Expand a tool to see its parameters and schema. The per-tool counts are indicative and are not scored directly; the schema's total context footprint is one signal in Schema Quality & AI Usability. A tool's description is untrusted text the model reads on every call, which is what makes this list a security surface and not just an inventory: how tool poisoning works →
check_service Check x402 service quality tier ~91
Fast pre-payment check of an x402 service. Returns Assay's quality tier (gold/ok/avoid/unrated) with a one-line verdict, based on real paid probes with on-chain receipts. Use before paying an unfamiliar x402 endpoint. The url must be the service's resource URL exactly as advertised (e.g. in the Bazaar).
| Name | Type | Req | Description |
|---|---|---|---|
| url | string | yes | The x402 service resource URL |
No output schema declared.
No examples provided.
get_score Get full Assay quality score ~75
Detailed quality report for an x402 service: composite score (0-100), component breakdown (payment settlement, schema conformance, ground-truth accuracy, LLM-judged quality), 7-day trend, and probe count. Backed by real paid probes.
| Name | Type | Req | Description |
|---|---|---|---|
| url | string | yes | The x402 service resource URL |
No output schema declared.
No examples provided.
rank_services Rank x402 candidate services by quality tier ~79
One call to order a list of candidate x402 services best-first by Assay's quality tier (gold/ok/avoid/unrated/unknown), backed by real paid probes. Use when choosing which of several services to pay. Free. For per-service evidence, follow up with get_score.
| Name | Type | Req | Description |
|---|---|---|---|
| urls | array | yes | Candidate x402 resource URLs |
No output schema declared.
No examples provided.
top_services List Assay-scored x402 services ~53
Ranked list of x402 services Assay actively probes, best composite score first. Use to find trustworthy paid services. Note: unrated entries are still accumulating probe history.
| Name | Type | Req | Description |
|---|---|---|---|
| limit | integer | – | Max services to return |
No output schema declared.
No examples provided.
What is the io.github.JasonCZMeng/assay MCP server?
io.github.JasonCZMeng/assay is an MCP server listed in the public MCP registry as io.github.JasonCZMeng/assay. x402 service-quality oracle: check a service's paid-probe quality tier and score before paying it. This page covers its npm package (assay-oracle-mcp).
Is the io.github.JasonCZMeng/assay MCP server safe to use?
io.github.JasonCZMeng/assay scores 85 out of 100 on VerifyMCP. We found no known CVEs affecting it as of 20 September 2026. It declares no install or post-install scripts. That is a record of what we were able to check automatically, not an endorsement. The category breakdown on this page shows every signal behind the number, including the ones we could not confirm.
What tools does the io.github.JasonCZMeng/assay MCP server expose?
io.github.JasonCZMeng/assay exposes 4 tools: check_service, rank_services, get_score, top_services. Their descriptions and schemas cost roughly 298 tokens of context every time the server is loaded.
Is the io.github.JasonCZMeng/assay MCP server still maintained?
io.github.JasonCZMeng/assay is still listed as active in the MCP registry. We last reached this channel on 20 September 2026. Those dates come from our own scans of the registry and the channel itself, not from anything the publisher announced.
What licence is the io.github.JasonCZMeng/assay MCP server under?
io.github.JasonCZMeng/assay declares the MIT licence, which is OSI-approved. That covers the source only, and says nothing about the cost of any service it calls.