SEO Data Extractor
Fetch a webpage and instantly extract all key SEO fields: title, meta tags, headings, canonical URL, and more. Give this API a web address and it will visit that page, then hand back everything an SEO professional needs to know: the page title, meta description, meta keywords, robots instructions, canonical link, H1/H2/H3 headings, how many links are on the page, and the HTTP status code. No setup required — just paste a URL and get structured data back in under two seconds. Pay-per-call at $0.01 USDC over x402 on Base or Solana — no account, no API key. OpenAPI 3.1.0; 1 operation(s): POST /extract.
This API exposes 1 operation across 1 path, and defines 4 schemas. It is described by OpenAPI 3.1.0, at version 1.0.0.
Requests are made against a single base URL, https://seo-data-extractor.underscoredone.com.
Metadata
The identity and technical contract details declared by the specification.
Authentication & Security 1
SEO Data Extractor declares
1 security scheme
for authenticating requests.
An API key is passed in the header as SIGN-IN-WITH-X (siwx).
siwx— CAIP-122 wallet signature for repeat access after payment
Paths & Operations 1
Across 1 path, the API surfaces 1 operation — 1 POST. Each is listed below with its method, path, parameters, and response codes.
Schemas 4
The contract defines 4 schemas that model the data the API accepts and returns. The most detailed are Response (13 properties), ValidationError (5 properties), Request (2 properties), HTTPValidationError (1 property). Each schema is shown below with its type and property counts.
Specification
The full machine-readable OpenAPI contract behind this narrative.
Source
This is an independent, third-party profile of SEO Data Extractor, published by API Evangelist. We do not operate, host, resell, or support these APIs, and we are not affiliated with or endorsed by the company unless stated above. Everything here is built from publicly available information — the company's own site, developer portal, documentation, public repositories, and the specifications it publishes for public use. Nothing is obtained by breaching a system, defeating an access control, or using credentials.
The Kin Score and Agent Readiness rating are independently calculated assessments of a company's public API artifacts, scored against a published rubric. They are not certifications, endorsements, security assessments, or audits.
Corrections, re-scores, and removal are free — no partnership or purchase required, and you do not need to justify the request. A removed company is recorded as unrated, never scored zero for having asked. Acknowledgement within one business day; removal within two.
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