Evaluate trustworthiness of any domain, URL, wallet, or API. Returns 0-100 score with 5 sub-scores: SSL, DNS, WHOIS, security headers, content. Zero-cost, zero-dependency. The trust layer agents need before interacting with unknown services. Pay-per-call via x402 (USDC on Base L2) -- no API key, no signup, no rate-limit wall.

Part of the klymax402 marketplace -- 100 x402 micropayment APIs for AI agents, one wallet, USDC on Base.

Quickstart -- MCP

Add to your MCP client config (Claude Desktop, Cursor, ElizaOS, etc.):

json

{
  "mcpServers": {
    "trust-score": {
      "url": "https://trust-score.api.klymax402.com/mcp"
    }
  }
}

Quickstart -- HTTP (x402)

bash

curl -X POST "https://trust-score.api.klymax402.com/api/score" \
  -H "Content-Type: application/json" \
  -d '{"target":"..."}'
# -> 402 Payment Required, with an x402 payment challenge in the response body

Any x402-aware client (@x402/fetch, x402-agent-tools, ATXP) handles the 402 -> sign -> retry cycle automatically.

Tools

Tool	Method	Path	Price	Description
`trust_score_evaluate`	POST	`/api/score`	$0.02	Evaluate trust of a domain, URL, wallet address, or API endpoint. Returns composite score 0-100 with grade (A+ to F), verdict (trusted/moderate/suspicious/dangerous), and 5 detailed sub-scores.
`trust_score_batch_compare`	POST	`/api/batch`	$0.03	Compare trustworthiness of 2-5 targets side by side. Returns all scores ranked from most to least trusted.

`trust_score_evaluate`

Use this when you need to check if a domain, website, API endpoint, or crypto wallet is safe to interact with. Returns a composite trust score 0-100 with letter grade (A+ to F), verdict (trusted/moderate/suspicious/dangerous), and 5 sub-scores:

Parameters

Name	Type	Required	Description
`target`	string	yes	Domain (example.com), full URL (https://api.example.com/v1), wallet address (0x...), or IP address to evaluate
`checks`	array	no	Which checks to run. Default: all. Pass a subset like ["ssl","dns"] for faster results (under 2s). Full scan takes 3-8s.

Example response:

json

{ compositeScore: 82, grade: "A", verdict: "trusted", subscores: { ssl: { score: 90, ... }, dns: { score: 85, ... }, ... } }

When to use: making payments, sending sensitive data, or trusting any external service. Essential for agent safety.

Not for: SEO analysis (use seo_audit_page), email validation (use email_verify_address), tech stack detection (use website_detect_tech_stack), port scanning (use network_scan_ports).

`trust_score_batch_compare`

Use this when you need to compare the trustworthiness of multiple domains, URLs, or wallets and pick the safest option. Accepts 2-5 targets and returns trust scores for all, sorted from most to least trusted.

Parameters

Name	Type	Required	Description
`targets`	array	yes	List of 2-5 domains, URLs, or wallet addresses to evaluate and rank

Not for: single targets (use trust_score_evaluate).

Example agent prompts

"Check if a domain, website, API endpoint, or crypto wallet is safe to interact with"
"Compare the trustworthiness of multiple domains, URLs, or wallets and pick the safest option"

Payment

Protocol: x402 -- HTTP-native pay-per-call, no signup, no API key
Network: Base L2 (eip155:8453)
Asset: USDC
Facilitator: Coinbase CDP (primary), PayAI (fallback)
Also reachable via ATXP (OAuth-wrapped x402, RFC 9728 protected-resource metadata)