Scholarly Works (OpenAlex)
OpenAlex, the open catalog of the global research system. Data CC0.
- cost
- Free every endpoint, within the daily allowance
- after that
- from $0.001 / call · card or USDC
- endpoints
- 9
No signup needed over MCP: 50 free calls a day, or 500 with a free key.
Search papers Free
Full-text search of scholarly works, with citations, authors and open-access links.
- cost
- Free then $0.003 / call
- MCP tool
- scholarly__works-search
- method
- GET
Free up to 50 calls a day over MCP (500 with a free key), then $0.003 per call by card credit or USDC. Free key · Pay by card
GET https://fourzerotwo.si/v1/scholarly/works-search
| Param | Type | Description |
|---|---|---|
| search | string | Query |
# free: send a free key from https://fourzerotwo.si/free curl -H "X-API-Key: fzt_…" "https://fourzerotwo.si/v1/scholarly/works-search?search=large%20language%20model%20agents" # no key: returns 402 with the price, for x402 agents curl -i "https://fourzerotwo.si/v1/scholarly/works-search?search=large%20language%20model%20agents"
by fourzerotwo
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Paper by id or DOI Free
One work by OpenAlex id (W…) or "doi:10.…".
- cost
- Free then $0.002 / call
- MCP tool
- scholarly__work
- method
- GET
Free up to 50 calls a day over MCP (500 with a free key), then $0.002 per call by card credit or USDC. Free key · Pay by card
GET https://fourzerotwo.si/v1/scholarly/work
| Param | Type | Description |
|---|---|---|
| id | string | OpenAlex id or doi:… |
# free: send a free key from https://fourzerotwo.si/free curl -H "X-API-Key: fzt_…" "https://fourzerotwo.si/v1/scholarly/work?id=doi%3A10.1038%2Fnature14539" # no key: returns 402 with the price, for x402 agents curl -i "https://fourzerotwo.si/v1/scholarly/work?id=doi%3A10.1038%2Fnature14539"
by fourzerotwo
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Search authors Free
Researchers by name with h-index, works and citation counts.
- cost
- Free then $0.002 / call
- MCP tool
- scholarly__authors-search
- method
- GET
Free up to 50 calls a day over MCP (500 with a free key), then $0.002 per call by card credit or USDC. Free key · Pay by card
GET https://fourzerotwo.si/v1/scholarly/authors-search
| Param | Type | Description |
|---|---|---|
| search | string | Author name |
# free: send a free key from https://fourzerotwo.si/free curl -H "X-API-Key: fzt_…" "https://fourzerotwo.si/v1/scholarly/authors-search?search=Geoffrey%20Hinton" # no key: returns 402 with the price, for x402 agents curl -i "https://fourzerotwo.si/v1/scholarly/authors-search?search=Geoffrey%20Hinton"
by fourzerotwo
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Author Free
One researcher by OpenAlex id or ORCID.
- cost
- Free then $0.002 / call
- MCP tool
- scholarly__author
- method
- GET
Free up to 50 calls a day over MCP (500 with a free key), then $0.002 per call by card credit or USDC. Free key · Pay by card
GET https://fourzerotwo.si/v1/scholarly/author
| Param | Type | Description |
|---|---|---|
| id | string | OpenAlex id or orcid:… |
# free: send a free key from https://fourzerotwo.si/free curl -H "X-API-Key: fzt_…" "https://fourzerotwo.si/v1/scholarly/author?id=A5108093963" # no key: returns 402 with the price, for x402 agents curl -i "https://fourzerotwo.si/v1/scholarly/author?id=A5108093963"
by fourzerotwo
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Search institutions Free
Universities and research institutions with output stats.
- cost
- Free then $0.002 / call
- MCP tool
- scholarly__institutions-search
- method
- GET
Free up to 50 calls a day over MCP (500 with a free key), then $0.002 per call by card credit or USDC. Free key · Pay by card
GET https://fourzerotwo.si/v1/scholarly/institutions-search
| Param | Type | Description |
|---|---|---|
| search | string | Institution |
# free: send a free key from https://fourzerotwo.si/free curl -H "X-API-Key: fzt_…" "https://fourzerotwo.si/v1/scholarly/institutions-search?search=University%20of%20Kent" # no key: returns 402 with the price, for x402 agents curl -i "https://fourzerotwo.si/v1/scholarly/institutions-search?search=University%20of%20Kent"
by fourzerotwo
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Search journals Free
Journals and repositories with impact stats.
- cost
- Free then $0.002 / call
- MCP tool
- scholarly__sources-search
- method
- GET
Free up to 50 calls a day over MCP (500 with a free key), then $0.002 per call by card credit or USDC. Free key · Pay by card
GET https://fourzerotwo.si/v1/scholarly/sources-search
| Param | Type | Description |
|---|---|---|
| search | string | Journal |
# free: send a free key from https://fourzerotwo.si/free curl -H "X-API-Key: fzt_…" "https://fourzerotwo.si/v1/scholarly/sources-search?search=Nature" # no key: returns 402 with the price, for x402 agents curl -i "https://fourzerotwo.si/v1/scholarly/sources-search?search=Nature"
by fourzerotwo
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Search topics Free
Research topics and fields.
- cost
- Free then $0.002 / call
- MCP tool
- scholarly__topics-search
- method
- GET
Free up to 50 calls a day over MCP (500 with a free key), then $0.002 per call by card credit or USDC. Free key · Pay by card
GET https://fourzerotwo.si/v1/scholarly/topics-search
| Param | Type | Description |
|---|---|---|
| search | string | Topic |
# free: send a free key from https://fourzerotwo.si/free curl -H "X-API-Key: fzt_…" "https://fourzerotwo.si/v1/scholarly/topics-search?search=quantum%20computing" # no key: returns 402 with the price, for x402 agents curl -i "https://fourzerotwo.si/v1/scholarly/topics-search?search=quantum%20computing"
by fourzerotwo
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Autocomplete works Free
Fast title autocomplete across works.
- cost
- Free then $0.001 / call
- MCP tool
- scholarly__autocomplete
- method
- GET
Free up to 50 calls a day over MCP (500 with a free key), then $0.001 per call by card credit or USDC. Free key · Pay by card
GET https://fourzerotwo.si/v1/scholarly/autocomplete
| Param | Type | Description |
|---|---|---|
| q | string | Partial title |
# free: send a free key from https://fourzerotwo.si/free curl -H "X-API-Key: fzt_…" "https://fourzerotwo.si/v1/scholarly/autocomplete?q=attention%20is%20all" # no key: returns 402 with the price, for x402 agents curl -i "https://fourzerotwo.si/v1/scholarly/autocomplete?q=attention%20is%20all"
by fourzerotwo
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Papers citing a paper Free
Works that cite a given OpenAlex work id.
- cost
- Free then $0.003 / call
- MCP tool
- scholarly__citing-works
- method
- GET
Free up to 50 calls a day over MCP (500 with a free key), then $0.003 per call by card credit or USDC. Free key · Pay by card
GET https://fourzerotwo.si/v1/scholarly/citing-works
| Param | Type | Description |
|---|---|---|
| work | string | Filter, e.g. cites:W2919115771 |
# free: send a free key from https://fourzerotwo.si/free curl -H "X-API-Key: fzt_…" "https://fourzerotwo.si/v1/scholarly/citing-works?work=cites%3AW2919115771" # no key: returns 402 with the price, for x402 agents curl -i "https://fourzerotwo.si/v1/scholarly/citing-works?work=cites%3AW2919115771"
by fourzerotwo
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Source: OpenAlex (openalex.org), data CC0.