{"slug": "build-a-practical-domain-research-workflow-with-rest-apis-and-mcp", "title": "Build a Practical Domain Research Workflow with REST APIs and MCP", "summary": "Esteve Castells, maker of DomScan, demonstrates a practical domain research workflow using REST APIs and the Model Context Protocol (MCP). The workflow separates availability, WHOIS, DNS security, and valuation checks, preserving partial failures and avoiding false certainty. Castells emphasizes treating every result as timestamped evidence and not converting missing checks into failures.", "body_md": "Disclosure: I’m Esteve Castells, the maker of DomScan. This tutorial uses DomScan because I can explain its behavior and limitations directly.\n\nA domain research task often begins with one simple question: is this name available?\n\nThat answer usually creates more questions. Who registered it? Which nameservers are active? Are email security records configured? Does the domain have certificate or reputation signals worth reviewing? If the domain is a candidate for a product or brand, what other evidence should inform the decision?\n\nThis tutorial builds a small workflow that keeps those checks separate, preserves partial failures, and avoids turning an unknown result into false certainty.\n\nCreate a [free DomScan account](https://domscan.net/login?mode=signup) and generate an API key from the dashboard. New accounts receive 10,000 credits every month with no card required. Each operation has its own published credit cost and limits.\n\nStore the key in an environment variable:\n\n```\nexport DOMSCAN_API_KEY=\"your_api_key\"\n```\n\nDomScan accepts API keys through the `X-API-Key`\n\nheader.\n\nThe availability endpoint accepts a name and one or more TLDs:\n\n```\ncurl \\\n  -H \"X-API-Key: $DOMSCAN_API_KEY\" \\\n  \"https://domscan.net/v1/status?name=launchcheck&tlds=com,io,dev\"\n```\n\nThis is more useful than reducing the result to a single boolean. The documented response can include the checked domain, availability state, evidence source, confidence, timestamps, latency, and error information.\n\nYour application should preserve three distinct outcomes:\n\nAn unknown result is not the same as an available domain. Availability evidence also does not guarantee that a registrar will allow registration. Reserved names, eligibility rules, premium status, and policy restrictions can still matter.\n\nOnce you have a complete domain, request its WHOIS data:\n\n```\ncurl \\\n  -H \"X-API-Key: $DOMSCAN_API_KEY\" \\\n  \"https://domscan.net/v1/whois?domain=example.com\"\n```\n\nWHOIS and RDAP data can provide registration context such as registrar information, dates, nameservers, statuses, and available contact or privacy signals.\n\nTreat every field as evidence with a timestamp. Registration records can be redacted, incomplete, or temporarily unavailable. Missing contact data does not prove that no contact exists, and a date returned by one check should not be stored forever without its check time.\n\nIf you need structured registration data directly, DomScan also documents an RDAP product in the [API documentation](https://domscan.net/docs).\n\nA domain can be registered and reachable while still having weak or incomplete DNS controls. The DNS security endpoint checks documented DNS and email-security signals:\n\n```\ncurl \\\n  -H \"X-API-Key: $DOMSCAN_API_KEY\" \\\n  \"https://domscan.net/v1/dns/security?domain=example.com\"\n```\n\nThis can help you review records and controls such as DNSSEC, SPF, DKIM, DMARC, CAA, MTA-STS, and TLS reporting where they are observable.\n\nThe important implementation detail is not to convert every missing or blocked check into “failed.” A record may be absent, a selector may not have been requested, or a lookup may be inconclusive. Keep the endpoint’s status, evidence, and caveats in your own data model.\n\nFor a candidate domain, you can request an algorithmic valuation estimate:\n\n```\ncurl \\\n  -H \"X-API-Key: $DOMSCAN_API_KEY\" \\\n  \"https://domscan.net/v1/value?domain=example.com\"\n```\n\nUse valuation as one input, not as a guaranteed sale price or prediction of buyer demand. A useful product can show the estimate beside availability, registration, and naming evidence without pretending they measure the same thing.\n\nHere is a small Node.js example that runs several checks and preserves the result of each request:\n\n``` js\nconst baseUrl = \"https://domscan.net\";\nconst apiKey = process.env.DOMSCAN_API_KEY;\n\nif (!apiKey) {\n  throw new Error(\"Set DOMSCAN_API_KEY before running this script.\");\n}\n\nasync function query(path) {\n  const response = await fetch(new URL(path, baseUrl), {\n    headers: {\n      \"X-API-Key\": apiKey,\n    },\n  });\n\n  const body = await response.json().catch(() => null);\n\n  return {\n    ok: response.ok,\n    status: response.status,\n    body,\n  };\n}\n\nconst domain = \"example.com\";\n\nconst checks = {\n  registration: `/v1/whois?domain=${encodeURIComponent(domain)}`,\n  dnsSecurity: `/v1/dns/security?domain=${encodeURIComponent(domain)}`,\n  valuation: `/v1/value?domain=${encodeURIComponent(domain)}`,\n};\n\nconst entries = await Promise.all(\n  Object.entries(checks).map(async ([name, path]) => {\n    try {\n      return [name, await query(path)];\n    } catch (error) {\n      return [\n        name,\n        {\n          ok: false,\n          status: null,\n          body: null,\n          error: error instanceof Error ? error.message : String(error),\n        },\n      ];\n    }\n  })\n);\n\nconst report = {\n  domain,\n  checkedAt: new Date().toISOString(),\n  checks: Object.fromEntries(entries),\n};\n\nconsole.log(JSON.stringify(report, null, 2));\n```\n\nThis structure gives each check its own HTTP status and response body. One temporary failure does not erase the successful checks, and your application can decide whether a missing result should block the whole workflow.\n\nBefore using this in production, add endpoint-specific validation and read the documented response fields rather than assuming every product has the same shape.\n\nREST is a good fit when your application already knows which checks to run. MCP is useful when a person or agent is still exploring the question.\n\nCompatible clients can connect to the hosted endpoint:\n\n```\nhttps://domscan.net/mcp\n```\n\nModern supported clients can complete authorization when prompted. The current [MCP setup guide](https://domscan.net/mcp-domain-checker) covers common client configurations.\n\nA useful prompt should define both the research goal and the evidence rules:\n\n```\nResearch example.com for a product review.\n\nCheck registration, DNS, email-security, certificate, and reputation\nsignals where supported. Keep observed, absent, unknown, not requested,\nand unsupported outcomes distinct. Include timestamps and caveats when\nthe tools return them. Do not treat an unknown result as safe or absent.\n```\n\nThis is more dependable than asking an agent whether a domain is simply “good.” It gives the agent a bounded task and tells it how uncertainty must be represented.\n\nBefore shipping a domain research feature:\n\nA good research workflow does not need to claim certainty. It needs to show what was checked, what was observed, and what remains unresolved.\n\n**Canonical CTA:** [Create a free DomScan account and make your first request](https://domscan.net/login?mode=signup)\n\nYou can review the full [DomScan API documentation](https://domscan.net/docs) before integrating.", "url": "https://wpnews.pro/news/build-a-practical-domain-research-workflow-with-rest-apis-and-mcp", "canonical_source": "https://dev.to/domscanmaker/build-a-practical-domain-research-workflow-with-rest-apis-and-mcp-3i40", "published_at": "2026-08-30 20:26:24+00:00", "updated_at": "2026-08-30 21:22:49.532684+00:00", "lang": "en", "topics": ["developer-tools", "ai-tools"], "entities": ["DomScan", "Esteve Castells", "MCP", "REST APIs"], "alternates": {"html": "https://wpnews.pro/news/build-a-practical-domain-research-workflow-with-rest-apis-and-mcp", "markdown": "https://wpnews.pro/news/build-a-practical-domain-research-workflow-with-rest-apis-and-mcp.md", "text": "https://wpnews.pro/news/build-a-practical-domain-research-workflow-with-rest-apis-and-mcp.txt", "jsonld": "https://wpnews.pro/news/build-a-practical-domain-research-workflow-with-rest-apis-and-mcp.jsonld"}}