# x402 Merchant Check (remote · mcp.gradientdecisions.com)

Pre-payment merchant trust checks for x402 agents on Base and Solana.

- Trust score: 62/100 (medium)
- Change this week: +4
- Registry status: active
- Liveness: live
- Owner verified: no
- Last scored: 2026-08-21

## Components

- remote · `mcp.gradientdecisions.com`: 62/100 (this document), [markdown](https://verifymcp.io/servers/com-gradientdecisions-merchant-check/mcp.md), [page](https://verifymcp.io/servers/com-gradientdecisions-merchant-check/mcp)

## Channel facts

- Endpoint: `https://mcp.gradientdecisions.com/mcp`
- Transports: `streamable-http`
- Auth: `none`
- Version: `1.0.0`

## Trust breakdown

How this component scores in each security and reliability category. Every signal is checked automatically against the live server, and we only credit what we can confirm. Scores are 0–100 per category. Scoring method: https://verifymcp.io/docs/scoring (what has changed: https://verifymcp.io/docs/scoring/changelog)

Scored 2026-08-21.

- **Endpoint Security**: 46/100
  - The endpoint's TLS certificate is valid, in date, and uses a strong key.
  - Authorisation not fully verified: no authorisation is required to call this server, and 1 tool(s) never declared a destructiveHint. The MCP spec treats an absent hint as destructive by default, so we cannot call this surface safe.
  - HTTPS enforcement could not be verified: the plaintext port answered with HTTP 406, which proves neither a plaintext path nor enforcement.
  - HSTS check failed: the Strict-Transport-Security header is absent.
  - DNSSEC check failed: this domain isn't protected by DNSSEC.
- **Transport & Reachability**: 100/100
  - Verified streamable-http transport via a live MCP handshake.
- **Schema Quality & AI Usability**: 70/100
  - AI-judged instruction clarity (excellent).
  - Context-footprint check failed: tool/resource definitions use about 451 tokens (~451/item across 1 items; 1 tools + 0 resources), over budget; trim descriptions and params.
  - Usage-examples check failed: none of the tools include examples.
- **Stability & Change Management**: 30/100
  - Stability observed for 9 of 30 days with no destabilising changes; credit accrues until the full window elapses.
- **Tool Coverage**: 100/100
  - 100% of tools have a non-trivial description (not blank, and not just the tool's name).
  - 100% of tool parameters carry a description.
- **Capabilities**: 100/100
  - Implements a supported MCP spec version (2025-11-25); the latest is 2026-07-28.

## Install

### Claude

```bash
claude mcp add --transport http com-gradientdecisions-merchant-check https://mcp.gradientdecisions.com/mcp
```

### Codex

```toml
[mcp_servers.com-gradientdecisions-merchant-check]
url = "https://mcp.gradientdecisions.com/mcp"
```

### opencode

```json
{
  "$schema": "https://opencode.ai/config.json",
  "mcp": {
    "com-gradientdecisions-merchant-check": {
      "type": "remote",
      "url": "https://mcp.gradientdecisions.com/mcp",
      "enabled": true
    }
  }
}
```

### OpenClaw

```bash
openclaw mcp add com-gradientdecisions-merchant-check --url https://mcp.gradientdecisions.com/mcp --transport streamable-http
```

### Hermes

```yaml
mcp_servers:
  com-gradientdecisions-merchant-check:
    url: "https://mcp.gradientdecisions.com/mcp"
```

### Other

```json
{
  "mcpServers": {
    "com-gradientdecisions-merchant-check": {
      "type": "http",
      "url": "https://mcp.gradientdecisions.com/mcp"
    }
  }
}
```

The mcpServers block is a cross-client convention. Remote transports vary, so check your client's docs.

## Changelog

Every change recorded for this component, newest first. Days that predate change tracking, or that we cannot explain, say so: "we were watching and nothing happened" and "we were not watching" are different claims.

### 2026-08-21 (score 62, +1)

No change was recorded against any check on this day. Stability & Change Management went from 27 to 30. That category is still filling its 30-day observation window: 8 days of observed history at the previous scan, 9 at this one. The score rises as the window fills, whether or not the server changes.

### 2026-08-19 (score 61, +1)

- [security] Tool “check_merchant” rewrote its description, which is the text the model reads
- [cosmetic] “check_merchant” reworded the description of “merchant_wallet_address”
- [cosmetic] “check_merchant” reworded the description of “resource_type”

### 2026-08-17 (score 60, +1)

No change was recorded against any check on this day. Stability & Change Management went from 13 to 17. That category is still filling its 30-day observation window: 4 days of observed history at the previous scan, 5 at this one. The score rises as the window fills, whether or not the server changes.

### 2026-08-15 (score 59, +1)

No change was recorded against any check on this day. Stability & Change Management went from 7 to 10. That category is still filling its 30-day observation window: 2 days of observed history at the previous scan, 3 at this one. The score rises as the window fills, whether or not the server changes.

### 2026-08-13 (score 58, +1)

- [functional improvement] Stability: unverified → 0.03

### 2026-08-12 (score 57)

First indexed and scored.

## MCP tools (1)

### `check_merchant` (~451 tokens)

Before paying an unfamiliar merchant via x402, including one just discovered through a marketplace like Coinbase's x402 Bazaar, call this for a machine-readable assessment of their observable on-chain payment behavior, on Base or Solana. Returns a `recommendation` (PROCEED / CAUTION / INSUFFICIENT_SIGNAL) a payment policy can branch on directly, plus supporting evidence: trust tier, confidence, payer diversity, transaction history, category (data_api/compute/content_generation/financial_data/storage/other), known platform URL(s), and the merchant's own advertised price(s) compared against category peers, with no caller-supplied price required for that. This is decision support drawn from observed behavior, not a certification. PROCEED means the available evidence doesn't show cause for concern, not a guarantee of safety. INSUFFICIENT_SIGNAL means there isn't enough history to say either way, distinct from an actual concern. Add a specific quoted price to also check that exact figure against comparable sellers. $0.01 USDC per check, paid via x402.

Input parameters:

- `amount` (string): Optional. Atomic payment amount from the 402 response's accepts[].amount, if preferred over `price`. Not required to score.
- `asset` (string): Optional. Payment asset/token from the 402 response's accepts[].asset. Not required to score.
- `merchant_wallet_address` (string, required): Merchant's receiving wallet address: a Base (0x...) or Solana (base58) address. Usually extractable directly from a 402 Payment Required response's accepts[].payTo.
- `network` (string): Optional. CAIP-2 network id from the 402 response's accepts[].network (e.g. "eip155:8453"), if already on hand. Not required to score.
- `price` (number): Quoted price in USD-equivalent, if checking fairness
- `resource_type` (string): Deprecated, accepted but unused. Price-fairness now compares against the merchant's own on-chain-derived category automatically, no need to supply this.
- `service_url` (string): Optional. The resource/service URL the agent was trying to reach. Not required to score.

## Diagnostics

Captured diagnostic sections: TLS, DNSSEC, Authorisation, Transports. The full working is on the page: https://verifymcp.io/servers/com-gradientdecisions-merchant-check/mcp#diagnostics

## Score history

- 2026-08-21: 62
- 2026-08-20: 61
- 2026-08-19: 61
- 2026-08-18: 60
- 2026-08-17: 60
- 2026-08-16: 59
- 2026-08-15: 59
- 2026-08-14: 58
- 2026-08-13: 58
- 2026-08-12: 57

## Links

- Remote endpoint: https://mcp.gradientdecisions.com/mcp
- Repository: https://github.com/clevbot/merchant-check-mcp-
- Changelog RSS feed: https://verifymcp.io/servers/com-gradientdecisions-merchant-check/mcp.xml
- Changelog JSON feed: https://verifymcp.io/servers/com-gradientdecisions-merchant-check/mcp.json
- HTML version of this page: https://verifymcp.io/servers/com-gradientdecisions-merchant-check/mcp