Outbound Domains API

Lists the domains a domain links to in the Rankfield web graph, with each one's Site Strength, 1,000 a page. Same filters, paging and export as All Referring Domains, in the other direction.

GEThttps://rankfield.dev/v1/domains/{domain}/outbound-domains

Send Authorization: Bearer YOUR_API_KEY. Get a free key; no account needed.

curl "https://rankfield.dev/v1/domains/github.com/outbound-domains?limit=3" \
  -H "Authorization: Bearer $RANKFIELD_API_KEY"

import os
import requests

response = requests.get(
    "https://rankfield.dev/v1/domains/github.com/outbound-domains?limit=3",
    headers={"Authorization": f"Bearer {os.environ['RANKFIELD_API_KEY']}"},
)
print(response.json())

const response = await fetch("https://rankfield.dev/v1/domains/github.com/outbound-domains?limit=3", {
  headers: {
    Authorization: `Bearer ${process.env.RANKFIELD_API_KEY}`,
  },
});
console.log(await response.json());

Response

{
  "domain": "github.com",
  "crawlRelease": "2026-may-jun-jul",
  "buildId": "graph-2026mayjunjul-v3",
  "asOf": "2026-08-19T00:00:00Z",
  "totalGraphRelationships": 218285,
  "sort": "strength_desc",
  "minSiteStrength": 0,
  "destinations": [
    { "domain": "adobe.com", "siteStrength": 100 },
    { "domain": "amazon.com", "siteStrength": 100 },
    { "domain": "amazonaws.com", "siteStrength": 100 }
  ],
  "nextCursor": "eyJ2IjoxLCJkb21haW4iOiJnaXRodWIuY29tIi…"
}

Parameters#

Name	Type	Description
`domain`path, required	string	A domain such as `github.com`. Case and a leading `www.` are ignored; a URL works too, URL-encoded.
`limit`query, optional	integerdefault `100`	Domains per page, 1 to 1,000.
`cursor`query, optional	string	`nextCursor` from the previous page. It keeps the filters, the order and the graph release of the first page.
`minSiteStrength`query, optional	integerdefault `0`	Leave out domains below this Site Strength, 0 to 100.
`sort`query, optional	stringdefault `strength_desc`	`strength_desc` or `strength_asc`.
`format`query, optional	stringdefault `json`	`csv` or `jsonl` export every matching row instead of one page (see Export).

Response#

Field	Type	Description
`domain`	string	The domain you asked about.
`inGraph`	boolean	Only when the domain isn't in our link graph yet: `false`, with an empty list. Absent otherwise.
`crawlRelease` `buildId` `asOf`	string	The web graph release, its build and the date the data describes.
`totalGraphRelationships`	integer	How many linked domains the domain has in the graph: all pages put together.
`sort` `minSiteStrength`	string, integer	The order and filter this page uses.
`destinations`	array	`{domain, siteStrength}`, strongest first by default. `siteStrength` is `null` for a domain without enough rank evidence.
`nextCursor`	string \| null	Pass it as `cursor` for the next page; `null` on the last page.

Errors#

Errors come as {"error":{"message":"…"}} with the HTTP status.

Status	When
`400`	The domain is not valid: `{"error":{"message":"Invalid domain"}}`.
`401`	The key is missing, unknown or revoked.
`409`	An export is already running for your key.
`429`	Only while the graph service is down and its fallback is busy. Wait for `Retry-After`.
`503`	The graph is briefly unavailable. Retry after `Retry-After`.

Price and limits#

Free; no per-call charge.
No daily quota or concurrency cap per key.

Export the whole list#

Add format=csv or format=jsonl to export every linked domain that matches minSiteStrength, with no page limit. Rows: domain, siteStrength, crawlRelease, asOf, evidenceCoverage.

Up to 50,000 rows stream straight back. A longer list answers 202 with a job: follow statusUrl (GET /v1/jobs/{id}) until status is completed, then download GET /v1/jobs/{id}/download, or the checksummed parts at /v1/jobs/{id}/parts/{index} (10,000 rows each). DELETE /v1/jobs/{id} cancels; POST /v1/jobs/{id}/resume restarts a failed job. Files are kept for 7 days.

One export runs at a time per key; a second one answers 409. A real run: example.com's 150,374 referring domains were ready in 1.4 seconds as an 11.8 MB CSV.

Reference: https://rankfield.dev/docs/referring-domains/start-an-export-job

curl "https://rankfield.dev/v1/domains/example.com/outbound-domains?format=csv" \
  -H "Authorization: Bearer $RANKFIELD_API_KEY"

import os
import requests

response = requests.get(
    "https://rankfield.dev/v1/domains/example.com/outbound-domains?format=csv",
    headers={"Authorization": f"Bearer {os.environ['RANKFIELD_API_KEY']}"},
)
print(response.json())

const response = await fetch("https://rankfield.dev/v1/domains/example.com/outbound-domains?format=csv", {
  headers: {
    Authorization: `Bearer ${process.env.RANKFIELD_API_KEY}`,
  },
});
console.log(await response.json());