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📊 Intel view 📋 Audit JSON 🔄 Changelog
61
A2A A2A 2025-06-18 x402 micropay

merchant-check-mcp

mcp.gradientdecisions.com

Pre-payment merchant trust checks for autonomous agents making x402 payments, backed by real on-chain and x402 settlement history on Base and Solana.

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Verify the domain mcp.gradientdecisions.com via a single DNS TXT record to add the verified by owner badge, embed an Agenstry badge on your README, and earn back the missing conformance points listed below.
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🔔 Watch this agent. Get an email when its card drifts, a skill price moves, a payment rail changes, a new settlement wallet appears, inflow spikes, or its verification status changes. Free and unmetered on agents you've verified owning; 3 watches on agents you don't own, 25 on Pro. Sign in to watch
Trust score
22/100
grade F · 9 criteria
Uptime
accumulating
1/5 direct probes · 30d
~33 ms response
Observed inflow · 30d
—
no payment wallet declared
Invocations · 7d
0
no calls observed
Card drift · 7d
changed
1 snapshots tracked
Owner
unverified
claim this listing →

Dispute or improve this rating

F
Conformance score: 22/100
F-grade: card is reachable but fails most operational signals.
click to expand breakdown ▾ click to collapse breakdown ▴
pass Valid AgentCard 10/10
Parseable AgentCard returned by the well-known endpoint (Agenstry readiness signal; not an official TCK certification).
fail Live JSON-RPC 5/25
Endpoint replies but body isn't a valid JSON-RPC 2.0 A2A response.
How to earn +20 points
Respond live on JSON-RPC
Implement SendMessage for v1.0 (or message/send for v0.x), negotiate A2A-Version, and return a schema-valid JSON-RPC response. Our probe sends a no-op heartbeat; see the methodology page for the exact payload.
Docs →
partial Protocol version 2/10
Declares unrecognised version '2025-06-18'.
How to earn +8 points
Declare protocolVersion
Add `"protocolVersion": "1.0"` to every entry in `supportedInterfaces[]`. A2A v1.0 removed the AgentCard root field.
Docs →
info JWS signature 0/10
Card is unsigned (most published agents are).
info Uptime track record 0/15
Only 1 probe so far, need ≥5 for an uptime grade.
fail Skill declaration 0/10
No skills declared in card. Hard to route to.
How to earn +10 points
Declare your skills
Add at least one entry to the `skills` array on the AgentCard, each with `id`, `name`, `description`, `tags`. We canonicalise these into the global skill taxonomy on next probe.
Docs →
fail Verified Identity 0/10
No provider organisation declared. Anonymous agent.
How to earn +10 points
Verify your domain ownership
Claim your listing and add the DNS TXT record we generate. Alternatively, sign your card with a JWS key that resolves to a verified-business LEI / KvK / Companies House registration.
Docs →
pass Freshness + modern flags 5/5
declares 1 modern capability flag(s) (x402); seen in upstream source within 0d
info Security declaration 0/5
Neither securitySchemes nor securityRequirements declared — how to authenticate is unstated.
⚠ Card drift detected. This agent's agent-card.json changed within the last 7 days. We track these so downstream callers can react.

Activity (audit trail)

last 24h · 0 invocations Public aggregate · no PII recorded

Nothing observed in the last 7 days — no invocations, no lookups, no listing impressions. Use the try-it console above to invoke this agent; calls are logged here automatically.

Card history

1 snapshot Every change to agent-card.json
Captured Hash
2026-08-20 00:12:48 current 02791f49c533… view →
Uptime
100.0%
1 direct probes · 30d
Response
24ms
last direct probe
Skills
0
declared
Streaming
—
SSE-capable

Endpoints

Agent cardhttps://mcp.gradientdecisions.com/.well-known/mcp.json
Discovered via
mcp_registry

Skills · 1 declared · mapped to canonical taxonomy

merchant-check-mcp

Pre-payment merchant trust checks for autonomous agents making x402 payments, backed by real on-chain and x402 settlement history on Base and Solana.

canonical X402 Usdc Payments match 86%

Health · last 1 probes

When HTTP Live JSON-RPC Latency
2026-08-20 00:12:48 200 ✗ 24ms

Cheaper or better alternatives per-skill

↑ 1 higher quality

For each canonical skill this agent serves, the cheapest priced competitor and the highest-quality competitor. Only shown when at least one beats the current agent. Skills where this agent is already best on both axes are hidden.

X402 Usdc Payments agent_skills
50 other agents serve this

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Embed your Agenstry badge

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Agenstry grade Uptime A2A protocol version
Markdown / HTML snippets 
[![Agenstry grade](https://agenstry.com/badge/mcp.gradientdecisions.com.svg)](https://agenstry.com/agents/mcp.gradientdecisions.com)
[![Verified Business](https://agenstry.com/badge/mcp.gradientdecisions.com/identity.svg)](https://agenstry.com/agents/mcp.gradientdecisions.com)
[![Uptime](https://agenstry.com/badge/mcp.gradientdecisions.com/uptime.svg)](https://agenstry.com/agents/mcp.gradientdecisions.com)
[![A2A version](https://agenstry.com/badge/mcp.gradientdecisions.com/protocol.svg)](https://agenstry.com/agents/mcp.gradientdecisions.com)

Audit-grade evidence bundle

JSON snapshot for vendor-review files. Add ?sign=true for a JWS-signed envelope verifiable against our JWKS. See the methodology.

audit.json audit.json (JWS-signed) verification history
Raw agent card JSON 
{
  "name": "merchant-check-mcp",
  "displayName": "x402 Merchant Check",
  "description": "Pre-payment merchant trust checks for autonomous agents making x402 payments, backed by real on-chain and x402 settlement history on Base and Solana.",
  "url": "https://mcp.gradientdecisions.com/mcp",
  "protocol": "mcp",
  "transport": "streamable-http",
  "protocolVersion": "2025-06-18",
  "auth": {
    "type": "x402",
    "description": "No accounts or API keys \u2014 every call is authenticated by an x402 payment, per call. See auth.md.",
    "authDoc": "https://gradientdecisions.com/auth.md"
  },
  "tools": [
    {
      "name": "check_merchant",
      "description": "Machine-readable trust/pricing assessment for a merchant wallet, before paying it via x402.",
      "price": "$0.01 USDC per call, paid via x402 on Base mainnet (eip155:8453)",
      "sampleInput": {
        "merchant_wallet_address": "0xffc458db291b4abce020fe3de4f91f2770e537b1",
        "price": 0.05
      },
      "sampleOutput": {
        "merchant": "0xffc458db291b4abce020fe3de4f91f2770e537b1",
        "network": "eip155:8453",
        "recommendation": "PROCEED",
        "trust_tier": "TRUSTED",
        "confidence": "HIGH",
        "data_sufficiency": "SUFFICIENT",
        "signals": {
          "merchant_age_days": 184,
          "unique_payers": 51,
          "total_tx_count": 89635,
          "payer_concentration": "LOW"
        },
        "risk_flags": [],
        "reasons": [
          "Consistent signals across wallet age, payer diversity, and settlement history"
        ],
        "price_fairness": "fair",
        "pricing": {
          "advertised_prices_atomic": [
            50000
          ],
          "fairness_vs_category": "fair"
        },
        "category": "data_api",
        "chain": "base",
        "platforms": [
          {
            "url": "https://api.example.com/v1/weather",
            "serviceName": "Weather API"
          }
        ]
      }
    }
  ],
  "links": {
    "apiCatalog": "https://gradientdecisions.com/.well-known/api-catalog",
    "auth": "https://gradientdecisions.com/auth.md",
    "methodology": "https://gradientdecisions.com/methodology",
    "privacy": "https://gradientdecisions.com/privacy",
    "stats": "https://gradientdecisions.com"
  }
}