Assay runs on your own machine — the client starts it, so there is no endpoint to ping. 47 installs a week from npm. Last commit 8 Aug 2026.
x402 service-quality oracle: check a service's paid-probe quality tier and score before paying it.
What the code does
We read the source, 5 d ago · rules 995398eba69f
What this server is able to do. For an MCP server this is often the job itself — a terminal server runs commands because that is what it is for. Listed so you know what you are plugging in, not as an accusation.
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"iVBORw0KGgoAAAANSUhEUgAAAQAAAAEACAYAAABccqhmAAAACXBIWXMAAAsTAAALEwEAmpwYAAAO/UlEQVR4nO2dW4xV1R3GeTxlDUxnOjcsXmYqYQaMDkbOzIoFCwGlYOTitagDqJEa2yb1kiAi6S0tYo3yUKqNKOiAOW1i+4DYSxR7SbVPaFVQTLMemiZt0qZN0/Z1NWsIFQemcy77nP9a6/97+N5nf+v7/87a3157zwwzs+QRHpCBkkoPZkj/AQgPyEAJABACQEAGSuwAC…
Is this your server and something here is wrong? Tell us — corrections are free and do not require a plan.
This code can reach further than it looks
We found places where it runs commands, builds paths or queries from values it is given. None of that is a flaw by itself — it becomes one when the code changes, and code changes quietly between releases. We re-read it on every one.
Connect this server
This server runs on your own machine — install it with the package manager and the client starts it for you. Package name taken from the official registry entry.
claude mcp add assay -- npx -y assay-oracle-mcp{
"mcpServers": {
"assay": {
"command": "npx",
"args": [
"-y",
"assay-oracle-mcp"
]
}
}
}[mcp_servers.assay]
command = "npx"
args = ["-y", "assay-oracle-mcp"]{
"mcpServers": {
"assay": {
"command": "npx",
"args": [
"-y",
"assay-oracle-mcp"
]
}
}
}{
"servers": {
"assay": {
"type": "stdio",
"command": "npx",
"args": [
"-y",
"assay-oracle-mcp"
]
}
}
}Optional settings from the registry entry, left out of the block above:
ASSAY_URL (Assay instance to query (default: https://assay.nominal-labs.com)), ASSAY_WALLET_KEY (Optional Base wallet private key; when set, get_score auto-purchases full reports ($0.005, hard-capped 0.01 USDC/call)).
Alternatives to Assay
same job, measured the same wayCheck an x402-paid API endpoint's trust score before paying it - live-probed, not self-reported.
Trust scoring for AI agents. Check scores, fidelity, and flags for x402 services.
Trust layer for the x402 economy - check any service before you pay. Scores, discovery, routing.
Pre-spend trust for AI agents that buy: check x402 services and product listings before paying.
Pre-spend trust for AI agents that buy: check x402 services and product listings before paying.
Check an x402 endpoint before your agent pays it: challenge validity and on-chain payer evidence.
Ask probe402's public record about an x402 or MPP endpoint before an agent pays it.
Check an x402 seller before paying: verdict, failure rate and evidence from paid calls on Base.
Assay — questions
Answers built from our own checks of this server.