RankParse API
SEO data API for developers and AI agents, powered by pre-processed Common Crawl data updated quarterly. 20 endpoints covering backlink graphs, domain authority, real-time page audits, and cross-domain intelligence — billed per call, no subscription, no monthly minimum.
- Docs: https://rankparse.com/docs
- Dashboard: https://rankparse.com/dashboard
- Pricing: https://rankparse.com/pricing
- MCP server: https://rankparse.com/docs/mcp
---
Authentication
All endpoints require an X-API-Key header with a key in rp_... format. Get a key at rankparse.com/dashboard.
On RapidAPI, authentication is handled by the gateway — include your X-RapidAPI-Key as usual.
---
Quick Start
curl "https://api.rankparse.com/v1/domain-authority?domain=example.com" \
-H "X-API-Key: rp_your_key_here"{
"domain": "example.com",
"data": {
"score": 72,
"referring_domains": 1103,
"total_host_count": 4821,
"registered_at": "1995-08-14",
"registrar": "IANA",
"popularity_rank": 3142,
"health_score": 85,
"risk_flags": []
},
"credits_used": 1,
"credits_remaining": 9999
}All responses use the same envelope: domain (or url), data, credits_used, credits_remaining. Paginated endpoints also include total, limit, and offset.
---
Endpoints
Link Graph
| Endpoint | Description | Credits | |---|---|---| | GET /v1/backlinks | Backlinks pointing to a domain, sorted by authority or recency | 2 | | GET /v1/referring-domains | Domains linking to a target with dofollow/nofollow link counts | 2 | | GET /v1/outbound-links | External links going out from a domain | 2 | | GET /v1/anchor-text | Anchor text distribution across all inbound links | 2 | | GET /v1/top-pages | Pages on the domain ranked by number of inbound links | 2 |
Domain Metrics
| Endpoint | Description | Credits | |---|---|---| | GET /v1/domain-authority | 0–100 authority score, RDAP registration data, Tranco popularity rank | 1 | | GET /v1/domain-rank | Inbound edge count, unique linking domains, avg linking host count | 2 | | GET /v1/crawl-history | First/last seen dates and total URL count from Common Crawl index | 2 |
Real-Time Page Analysis
These endpoints fetch the target URL live at request time.
| Endpoint | Description | Credits | |---|---|---| | GET /v1/page-seo | Full SEO audit: meta tags, Open Graph, JSON-LD, hreflang, headings, image alt coverage, internal/external links, word count | 3 | | GET /v1/site-health | HTTPS enforcement, HSTS, security headers, robots.txt, sitemap availability | 2 | | GET /v1/sitemap | Discover and parse a domain's sitemap — returns URLs with lastmod, changefreq, priority | 2 | | GET /v1/tech-stack | Server software, CMS, and framework signals from HTTP headers and meta tags | 2 | | GET /v1/page-performance | Google PageSpeed Insights — Lighthouse scores and Core Web Vitals (LCP, CLS, TBT, FCP) | 3 |
Cross-Domain Intelligence
| Endpoint | Description | Credits | |---|---|---| | GET /v1/domain-overlap | Domains linking to 2–5 of your specified targets | 5 | | GET /v1/link-intersect | Domains linking to both domain_a and domain_b | 5 | | GET /v1/competitor-gap | Domains linking to a competitor but not to you | 5 | | GET /v1/similar-domains | Domains sharing link sources — topical proximity signal | 5 |
Power Endpoints
| Endpoint | Description | Credits | |---|---|---| | GET /v1/link-audit | Composite link quality score, anchor profile breakdown, risk flags, outbound concentration | 8 | | GET /v1/site-explorer | Backlinks + authority + top pages + anchor text in a single call | 10 | | POST /v1/batch | Backlinks for up to 50 domains in one request | 2 per domain |
---
Common Parameters
| Parameter | Type | Required | Notes | |---|---|---|---| | domain | string | Yes (domain endpoints) | Bare domain only: example.com, not https://example.com | | url | string | Yes (URL endpoints) | Full URL including scheme: https://example.com/page | | limit | integer | No | Default 100, max 1000 (silently clamped) | | sort | string | No | importance (default) or recent — backlinks endpoint only | | score | boolean | No | Adds from_domain_score, anchor_type, link_quality to each row (+1 credit) — backlinks and referring-domains |
Domains with no data return 200 with "data": [] — never 404.
---
Example Responses
GET /v1/backlinks
curl "https://api.rankparse.com/v1/backlinks?domain=example.com&limit=2&sort=importance" \
-H "X-API-Key: rp_your_key_here"{
"domain": "example.com",
"data": [
{
"from_domain": "ycombinator.com",
"from_url": "https://news.ycombinator.com/item?id=39201847",
"to_url": "https://example.com/blog/post",
"anchor_text": "example.com",
"rel": null,
"link_type": "hyperlink",
"crawled_at": "2026-01-14"
},
{
"from_domain": "dev.to",
"from_url": "https://dev.to/user/article",
"to_url": "https://example.com/",
"anchor_text": "check this tool",
"rel": "nofollow",
"link_type": "hyperlink",
"crawled_at": "2026-02-03"
}
],
"credits_used": 2,
"credits_remaining": 9998
}GET /v1/referring-domains
curl "https://api.rankparse.com/v1/referring-domains?domain=example.com&limit=2" \
-H "X-API-Key: rp_your_key_here"{
"domain": "example.com",
"data": [
{
"from_domain": "ycombinator.com",
"dofollow_links": 14,
"nofollow_links": 2,
"total_links": 16
},
{
"from_domain": "dev.to",
"dofollow_links": 0,
"nofollow_links": 8,
"total_links": 8
}
],
"credits_used": 2,
"credits_remaining": 9996
}GET /v1/domain-authority
curl "https://api.rankparse.com/v1/domain-authority?domain=example.com" \
-H "X-API-Key: rp_your_key_here"{
"domain": "example.com",
"data": {
"score": 72,
"referring_domains": 1103,
"total_host_count": 4821,
"registered_at": "1995-08-14",
"registrar": "IANA",
"popularity_rank": 3142,
"health_score": 85,
"risk_flags": []
},
"credits_used": 1,
"credits_remaining": 9995
}score is 0–100. popularity_rank is from the Tranco top-1M list — null if outside the top 100k. risk_flags values: new_domain, low_authority, no_tranco_presence, high_authority_new_domain.
GET /v1/page-seo
curl "https://api.rankparse.com/v1/page-seo?url=https://example.com" \
-H "X-API-Key: rp_your_key_here"{
"url": "https://example.com",
"data": {
"url": "https://example.com",
"final_url": "https://example.com/",
"status_code": 200,
"response_time_ms": 312,
"title": { "text": "Example Domain", "length": 14, "optimal": false },
"description": { "text": null, "length": 0, "optimal": false },
"canonical": { "url": "https://example.com/", "self_referential": true },
"robots": { "index": true, "follow": true, "raw": null },
"viewport": "width=device-width, initial-scale=1",
"language": { "primary": "en", "tag": "en-US", "source": "html_lang" },
"hreflang": [],
"headings": { "h1": ["Example Domain"], "h2": [], "h3_count": 0 },
"og": {},
"twitter": {},
"json_ld": [],
"images": { "total": 0, "missing_alt": 0 },
"links": { "internal": 0, "external": 1 },
"word_count": 28,
"favicon": null
},
"credits_used": 3,
"credits_remaining": 9992
}title.optimal is true when length is 30–60 characters. description.optimal is true when 120–160 characters. Returns 503 with code: fetch_failed if the target URL is unreachable.
GET /v1/site-health
curl "https://api.rankparse.com/v1/site-health?domain=example.com" \
-H "X-API-Key: rp_your_key_here"{
"domain": "example.com",
"data": {
"domain": "example.com",
"https": { "enforced": true, "hsts": true, "hsts_max_age": 31536000 },
"www_redirect": { "enabled": false, "target": null },
"checks": [
{ "url": "https://example.com/", "status": 200, "content_type": "text/html", "response_time_ms": 180 },
{ "url": "https://example.com/robots.txt", "status": 200, "content_type": "text/plain", "response_time_ms": 95 },
{ "url": "https://example.com/sitemap.xml", "status": 404, "content_type": null, "response_time_ms": 88 }
],
"security_headers": {
"x_frame_options": "SAMEORIGIN",
"x_content_type_options": "nosniff",
"content_security_policy": false,
"strict_transport_security": "max-age=31536000",
"referrer_policy": null
},
"robots_txt": { "present": true, "disallow_all": false, "sitemap_declared": false }
},
"credits_used": 2,
"credits_remaining": 9990
}---
Error Codes
All errors return JSON with error, code, and message fields.
| HTTP Status | Code | Meaning | |---|---|---| | 400 | invalid_domain | domain parameter missing or malformed | | 400 | invalid_url | url parameter missing or invalid | | 400 | private_ip | URL resolves to a private/reserved IP (page-seo only) | | 401 | unauthorized | Missing or invalid API key | | 402 | insufficient_credits | Credit balance too low | | 429 | rate_limited | 60 requests/minute per API key exceeded | | 429 | quota_exceeded | Global daily PageSpeed quota reached (page-performance only) | | 429 | user_quota_exceeded | Per-user daily cap reached — max 50/day (page-performance only) | | 503 | fetch_failed | Real-time fetch of target URL failed or timed out | | 503 | psi_unavailable | PageSpeed Insights API unavailable |
---
Pricing
Credits are the billing unit. Starting at $0.009 per credit. Credits never expire. No subscription, no monthly minimum.
Purchase at rankparse.com/pricing.
---
MCP Server
All endpoints are also available as MCP tools via mcp.rankparse.com. This lets Claude, ChatGPT, and other MCP-compatible clients call RankParse mid-conversation without custom code.
SSE (Claude, ChatGPT): `` https://mcp.rankparse.com/?apiKey=rp_your_key_here ``
Streamable HTTP (Claude Code, Cursor, Windsurf): `` https://mcp.rankparse.com/mcp Header: X-API-Key: rp_your_key_here ``
Setup guide: rankparse.com/docs/mcp
---
Files in This Repository
| File | Description | |---|---| | openapi.yaml | OpenAPI 3.0 spec — import into RapidAPI, Postman, or any client generator | | rankparse.postman_collection.json | Postman collection with all endpoints pre-configured | | server.json | MCP registry entry (streamable HTTP transport) |
