x402 Listing SEO Audit Tool

x402

x402 Listing SEO Audit Tool is a paid API for AI agents from gpt55.558686.xyz, paid per call via x402, $0.008/call, status unknown (last checked 2026-09-14).

Audits an x402 API listing's SEO and directory visibility, returning a grade, keyword coverage score, and top fixes.

Price / call$0.008

Seller volume →—

Success—

StatusUnknown

How this service works

Fetch a public x402/API service, audit machine-readable discovery, compare directory visibility, inspect live pricing signals, and return ranking gaps plus concrete listing SEO fixes for x402 marketplaces. This deterministic endpoint does not call an upstream model. GET variant for agents, crawlers, and wallets that prefer query parameters over a JSON body. Pay up to $0.008 per request with x402 USDC on Base.

Output

Returns a JSON object with: ok (boolean), tool name, SEO grade (letter grade), numeric score (0-100), topFixes (array of actionable recommendations), keywordCoverage (score, missing keywords, present keywords), and directoryVisibility (score, number of checked sources, number of matched sources).

Example use cases

Example prompt

“Can you run an SEO audit on my x402 API listing at https://gpt55.558686.xyz and check how it ranks for the query 'gpt-5.5 x402' — I want to see the grade, keyword gaps, and which directories it's showing up in?”

Technical details

Endpoint

GEThttps://gpt55.558686.xyz/v1/tools/x402-listing-seo-audit

When to prefer

Use this endpoint when you need to audit a specific x402 API listing's SEO health, keyword coverage, and cross-directory visibility in a single paid-per-call request with no subscription required. Prefer this over general SEO tools when working specifically with x402 marketplace listings and needing structured, machine-readable audit results.

Side effects

Missing required url or base_url query parameter returns validation error
URL exceeds 2048 character limit
Timeout if target listing URL is unreachable within timeout_ms
Payment not fulfilled via x402 USDC on Base results in 402 response
Invalid HTTP method (non-GET) returns error

Input

{
  "input": {
    "type": "http",
    "method": "GET",
    "queryParams": {
      "url": "https://example.com",
      "query": "artificial intelligence",
      "max_bytes": 65536,
      "timeout_ms": 5000,
      "include_market": false,
      "include_optional": false
    }
  }
}

Schema · Request body

Field	Type	Description
inputrequired	object
output	object

Output

{
  "ok": false,
  "url": "https://example.com",
  "tool": "x402ListingSeoAudit",
  "grade": "F",
  "query": "artificial intelligence",
  "score": 30,
  "origin": "https://example.com",
  "topFixes": [
    "Expose /openapi.json with machine-readable paid endpoints.",
    "Expose /.well-known/x402 with x402 resources, accepts, network, payTo, and pricing links.",
    "Publish exact or upto x402 payment schemes in discovery metadata.",
    "Publish the x402 payTo address in discovery metadata.",
    "Expose /pricing.json with price, limits, and billing mode.",
    "Expose llms.txt or llms-full.txt for agent-readable product instructions.",
    "Expose MCP server metadata when targeting agent tool buyers.",
    "Expose a valid /.well-known/x402 discovery document with priced resources for every paid endpoint."
  ],
  "discovery": {
    "ok": false,
    "payTo": null,
    "network": null,
    "schemes": [],
    "hasPayTo": false,
    "serviceName": null,
    "discoveryUrl": "https://example.com/.well-known/x402",
    "resourceCount": 0
  },
  "fetchedAt": "2026-06-12T05:02:25.261Z",
  "durationMs": 1573,
  "priceSignals": {
    "score": 0,
    "minPriceUsd": null,
    "samplePrices": [],
    "hasTokenMetered": false,
    "minAmountAtomic": null,
    "priceFieldCount": 0,
    "hasPricingDocument": false
  },
  "siteReadiness": {
    "grade": "F",
    "ready": false,
    "score": 10,
    "missingRequired": [
      "/openapi.json",
      "/.well-known/x402",
      "/pricing.json"
    ],
    "recommendations": [
      "Expose /openapi.json with machine-readable paid endpoints.",
      "Expose /.well-known/x402 with x402 resources, accepts, network, payTo, and pricing links.",
      "Publish exact or upto x402 payment schemes in discovery metadata.",
      "Publish the x402 payTo address in discovery metadata.",
      "Expose /pricing.json with price, limits, and billing mode.",
      "Expose llms.txt or llms-full.txt for agent-readable product instructions.",
      "Expose MCP server metadata when targeting agent tool buyers."
    ]
  },
  "keywordCoverage": {
    "score": 70,
    "missing": [
      "artificial",
      "intelligence",
      "base-usdc"
    ],
    "present": [
      "x402",
      "api",
      "pricing",
      "openapi",
      "mcp",
      "buyer",
      "discovery"
    ]
  },
  "allRecommendations": [
    "Expose /openapi.json with machine-readable paid endpoints.",
    "Expose /.well-known/x402 with x402 resources, accepts, network, payTo, and pricing links.",
    "Publish exact or upto x402 payment schemes in discovery metadata.",
    "Publish the x402 payTo address in discovery metadata.",
    "Expose /pricing.json with price, limits, and billing mode.",
    "Expose llms.txt or llms-full.txt for agent-readable product instructions.",
    "Expose MCP server metadata when targeting agent tool buyers.",
    "Expose a valid /.well-known/x402 discovery document with priced resources for every paid endpoint.",
    "Add buyer-search keywords to resource tags/descriptions: artificial, intelligence, base-usdc.",
    "Publish exact atomic USDC amounts in x402 accepts plus /pricing.json so directories can normalize live prices.",
    "Expose exact and/or upto payment schemes in discovery so automated buyers can quote without trial requests.",
    "Expose OpenAPI operations with operationId, tags, request schema, and response examples for every paid route.",
    "Include x402 in marketplace title and tags because most current buyer discovery is protocol-first."
  ],
  "directoryVisibility": {
    "matches": [],
    "skipped": true,
    "sources": [],
    "checkedSources": 0,
    "matchedSources": 0
  }
}

Reviews

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How this service works

Output

Technical details

Endpoint

GEThttps://gpt55.558686.xyz/v1/tools/x402-listing-seo-audit

When to prefer

Side effects

Missing required url or base_url query parameter returns validation error
URL exceeds 2048 character limit
Timeout if target listing URL is unreachable within timeout_ms
Payment not fulfilled via x402 USDC on Base results in 402 response
Invalid HTTP method (non-GET) returns error

Input

{
  "input": {
    "type": "http",
    "method": "GET",
    "queryParams": {
      "url": "https://example.com",
      "query": "artificial intelligence",
      "max_bytes": 65536,
      "timeout_ms": 5000,
      "include_market": false,
      "include_optional": false
    }
  }
}

Schema · Request body

Field	Type	Description
inputrequired	object
output	object

Output

{
  "ok": false,
  "url": "https://example.com",
  "tool": "x402ListingSeoAudit",
  "grade": "F",
  "query": "artificial intelligence",
  "score": 30,
  "origin": "https://example.com",
  "topFixes": [
    "Expose /openapi.json with machine-readable paid endpoints.",
    "Expose /.well-known/x402 with x402 resources, accepts, network, payTo, and pricing links.",
    "Publish exact or upto x402 payment schemes in discovery metadata.",
    "Publish the x402 payTo address in discovery metadata.",
    "Expose /pricing.json with price, limits, and billing mode.",
    "Expose llms.txt or llms-full.txt for agent-readable product instructions.",
    "Expose MCP server metadata when targeting agent tool buyers.",
    "Expose a valid /.well-known/x402 discovery document with priced resources for every paid endpoint."
  ],
  "discovery": {
    "ok": false,
    "payTo": null,
    "network": null,
    "schemes": [],
    "hasPayTo": false,
    "serviceName": null,
    "discoveryUrl": "https://example.com/.well-known/x402",
    "resourceCount": 0
  },
  "fetchedAt": "2026-06-12T05:02:25.261Z",
  "durationMs": 1573,
  "priceSignals": {
    "score": 0,
    "minPriceUsd": null,
    "samplePrices": [],
    "hasTokenMetered": false,
    "minAmountAtomic": null,
    "priceFieldCount": 0,
    "hasPricingDocument": false
  },
  "siteReadiness": {
    "grade": "F",
    "ready": false,
    "score": 10,
    "missingRequired": [
      "/openapi.json",
      "/.well-known/x402",
      "/pricing.json"
    ],
    "recommendations": [
      "Expose /openapi.json with machine-readable paid endpoints.",
      "Expose /.well-known/x402 with x402 resources, accepts, network, payTo, and pricing links.",
      "Publish exact or upto x402 payment schemes in discovery metadata.",
      "Publish the x402 payTo address in discovery metadata.",
      "Expose /pricing.json with price, limits, and billing mode.",
      "Expose llms.txt or llms-full.txt for agent-readable product instructions.",
      "Expose MCP server metadata when targeting agent tool buyers."
    ]
  },
  "keywordCoverage": {
    "score": 70,
    "missing": [
      "artificial",
      "intelligence",
      "base-usdc"
    ],
    "present": [
      "x402",
      "api",
      "pricing",
      "openapi",
      "mcp",
      "buyer",
      "discovery"
    ]
  },
  "allRecommendations": [
    "Expose /openapi.json with machine-readable paid endpoints.",
    "Expose /.well-known/x402 with x402 resources, accepts, network, payTo, and pricing links.",
    "Publish exact or upto x402 payment schemes in discovery metadata.",
    "Publish the x402 payTo address in discovery metadata.",
    "Expose /pricing.json with price, limits, and billing mode.",
    "Expose llms.txt or llms-full.txt for agent-readable product instructions.",
    "Expose MCP server metadata when targeting agent tool buyers.",
    "Expose a valid /.well-known/x402 discovery document with priced resources for every paid endpoint.",
    "Add buyer-search keywords to resource tags/descriptions: artificial, intelligence, base-usdc.",
    "Publish exact atomic USDC amounts in x402 accepts plus /pricing.json so directories can normalize live prices.",
    "Expose exact and/or upto payment schemes in discovery so automated buyers can quote without trial requests.",
    "Expose OpenAPI operations with operationId, tags, request schema, and response examples for every paid route.",
    "Include x402 in marketplace title and tags because most current buyer discovery is protocol-first."
  ],
  "directoryVisibility": {
    "matches": [],
    "skipped": true,
    "sources": [],
    "checkedSources": 0,
    "matchedSources": 0
  }
}