SPARQL Query Runner
Pricing
from $0.35 / 1,000 bindings
SPARQL Query Runner
Point at ANY public SPARQL endpoint (Wikidata, DBpedia, UniProt, government & museum Linked-Open-Data) and run a query over the W3C SPARQL 1.1 Protocol. SELECT flattens to dynamic columns per binding, ASK to a boolean, CONSTRUCT/DESCRIBE to triples. One actor, any knowledge graph. Pay per binding.
Pricing
from $0.35 / 1,000 bindings
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Datamule
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5 days ago
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Point at ANY public SPARQL endpoint, send a query, get a dataset. One actor speaks to every knowledge graph in the Linked-Open-Data world over the W3C SPARQL 1.1 Protocol — no per-site scraper, no host enumeration.
SPARQL is the query language of the semantic web. Wikidata, DBpedia, UniProt / EBI (life sciences), Bio2RDF, the EU / EEA and national-library / museum Linked-Open-Data endpoints, and thousands of government open-data triplestores all serve the identical protocol. Give this actor an endpoint URL and a SPARQL query and it turns the result straight into rows.
What it does
Sends your query to the endpoint with Accept: application/sparql-results+json and
flattens the response. The output shape follows the query form:
| Query form | Output |
|---|---|
| SELECT | One row per result binding. Each SELECT variable becomes a top-level column equal to its .value — the columns are literally your query's variables. A variable left unbound in a binding (e.g. an OPTIONAL that didn't match) is null. The full typed binding (uri / literal / bnode, datatype, xml:lang) is preserved losslessly in _raw. |
| ASK | A single row: { "_queryType": "ask", "boolean": true/false }. |
| CONSTRUCT / DESCRIBE | Best-effort: the query is sent with Accept: application/n-triples and one row is emitted per triple (subject / predicate / object). If the endpoint won't return N-Triples, the source is skipped with a warning (never fabricated). |
Every row carries _endpoint, _queryType, _rowIndex and _raw.
Input
| Field | Description |
|---|---|
endpoint | A SPARQL endpoint URL, e.g. https://query.wikidata.org/sparql. Required unless endpoints is given. |
endpoints | Optional: run the same query across several endpoints (mirrors / cross-KG). Each row is tagged with its _endpoint. |
query | Required. The SPARQL query. SELECT / ASK are primary; CONSTRUCT / DESCRIBE best-effort. |
method | GET (default) or POST (for queries too long for a URL). |
maxRecords | Optional global cap on rows across all endpoints (one billable event per row). |
userAgent | Optional override. A descriptive User-Agent is sent by default — required in practice for Wikidata, which blocks blank / generic UAs. |
defaultGraphUri / namedGraphUri | Optional SPARQL-protocol dataset graph parameters. |
timeoutSecs | Optional read timeout (default 90s; endpoints enforce their own server-side caps). |
bearer / extraHeaders | Optional, for auth-gated deployments. Never required, never logged. |
Examples
All-purpose portable query (works on almost any endpoint):
Wikidata — countries and their population (dynamic columns country, countryLabel, population):
Resilience
An endpoint that returns a 4xx/5xx, times out, or answers with a non-SPARQL body (an HTML error / anti-bot page, a SPARQL syntax-error response) is skipped with a warning and the batch continues. A run where every endpoint is skipped fails so nothing broken ships. A reachable endpoint that returns 0 bindings yields 0 rows and a clean success.
Pricing
Pay-per-event: one binding charge per emitted row.
