Find a legal free full text for any DOI via Unpaywall
Find a legal free full text for any DOI via Unpaywall - open access status, best PDF link, host, version, licence and alternate repository copies
Answers HTTP 404 without x402 payment termsour last check, 2026-10-18
0 of 1checks answered this week
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Paid test badge: not yet. The checks above are free: we call the tool without paying and read the payment request it sends back. The Verified badge needs paid calls whose answers match the promised output, and nobody can buy a badge.
Endpoint
GET https://saylorinnovations.com/api/research/open-access
| Category | Search and research |
|---|---|
| Provider host | saylorinnovations.com |
| Networks | eip155:8453, solana:5eykt4UsFv8P8NJdTREpY1vzqKqZKvdp |
| Payment schemes | exact |
| Self-reported calls, 30 days | 1 from 1 payers (the provider's figure, not ours) |
Our checks, last 30 days
| Day | Result | HTTP | Asked | Time |
|---|---|---|---|---|
| 2026-10-18 | no x402 terms | 404 | 225 ms |
Example input (from the provider)
{
"method": "GET",
"queryParams": {
"doi": "10.1038/nature12373"
},
"type": "http"
}
Promised output schema (from the provider)
{
"$schema": "https://json-schema.org/draft/2020-12/schema",
"properties": {
"input": {
"additionalProperties": false,
"properties": {
"method": {
"enum": [
"GET",
"POST",
"PUT",
"PATCH",
"DELETE",
"HEAD"
],
"type": "string"
},
"queryParams": {
"properties": {
"doi": {
"description": "DOI of a scholarly article, e.g. 10.1038/nature12373",
"type": "string"
}
},
"required": [
"doi"
],
"type": "object"
},
"type": {
"const": "http",
"type": "string"
}
},
"required": [
"type",
"method"
],
"type": "object"
},
"output": {
"properties": {
"example": {
"properties": {
"best_location": {
"description": "Best location",
"type": [
"object",
"null"
]
},
"doi": {
"description": "Digital object identifier",
"type": "string"
},
"is_open_access": {
"description": "True when this is open access",
"type": "boolean"
},
"issn": {
"type": "array"
},
"journal": {
"type": [
"string",
"null"
]
},
"journal_is_in_doaj": {
"description": "Journal is in doaj",
"type": "boolean"
},
"note": {
"description": "Caveat or context for reading the result",
"type": "string"
},
"oa_status": {
"description": "Oa status",
"type": [
"string",
"null"
]
},
"other_locations": {
"description": "Other locations",
"type": "array"
},
"publisher": {
"type": [
"string",
"null"
]
},
"source": {
"description": "Data source the values come from",
"type": "string"
},
"title": {
"description": "Title",
"type": [
"string",
"null"
]
},
"year": {
"description": "Calendar year",
"type": [
"number",
"null"
]
}
},
"required": [
"doi",
"is_open_access"
],
"type": "object"
},
"type": {
"const": "json",
"type": "string"
}
},
"required": [
"type"
],
"type": "object"
}
},
"required": [
"input"
],
"type": "object"
}