Upload a research PDF, poll for completion, and consume structured study data as JSON.
Send requests with Authorization: Bearer <token>. Generate and rotate keys in your Dashboard → API Keys.
20¢ per paper
1 credit = 1 paper extraction
Results cached — re-uploads are free
No monthly fees — pay only for what you use
Credits never expire
import time, requests
API = "https://api.evidence.guide/v1"
HEADERS = {"Authorization": "Bearer <API_KEY>"}
# 1) Upload a PDF
with open("trial.pdf", "rb") as f:
res = requests.post(f"{API}/parse", headers=HEADERS, files={"file": f})
res.raise_for_status()
job_id = res.json()["job_id"]
# 2) Poll for completion (202 = still processing)
while True:
res = requests.get(f"{API}/result/{job_id}", headers=HEADERS)
res.raise_for_status()
data = res.json()
status = data.get("status")
if status == "completed":
break
if status == "failed":
raise RuntimeError(data.get("error", {}).get("message", "job_failed"))
time.sleep(int(res.headers.get("Retry-After", 5)))
# 3) Use the structured output
payload = data["result"]
print(payload["studies"][0]["p_value"])Official packages that handle authentication, polling, and data transformation for you.
Minimal surface area: upload → poll → feedback.
Submit a research PDF for structured extraction.
file (PDF). File uploads only; DOI strings are not accepted in v2.{"job_id": "job_123"}Fetch job status and structured result payload.
{
"status": "queued | processing | completed | failed | cancelled",
"result": { "...": "present when completed" },
"error": {
"message": "present when failed"
}
}When status is queued or processing, the response includes Retry-After: <seconds>. Respect it to stay within rate limits.
Attach human corrections or notes to a completed study. Stored server-side for evaluation; does not mutate prior results.
{
"label": "correct | incorrect | unclear | missing",
"comment": "Optional context for reviewers",
"field_name": "p_value" // Optional: target a specific extracted field
}Returns 201 Created with the new feedback identifier.
Fields may be null or omitted when not extractable.
{
"metadata": {
"title": "string",
"doi": "string|null",
"year": 2024,
"journal": "string|null"
},
"studies": [
{
"design": "between|within|observational|null",
"n": 120,
"arms": ["treatment","control"],
"hypotheses": ["H1 ..."],
"tests": [
{
"stat": "t|F|chi2|z|r|beta|OR|RR|HR|other",
"value": -2.31,
"df": [58],
"p": 0.024,
"effect_size": { "type": "d|r|g|OR|...", "value": 0.35, "ci": [0.10, 0.60] },
"measure": "primary_outcome",
"note": "optional"
}
],
"excerpts": [
{ "text": "quoted sentence...", "page": 5 }
]
}
]
}// 400 Bad Request
{ "error": "invalid_request", "message": "No file provided." }
// 401 Unauthorized
{ "error": "unauthorized", "message": "Invalid or revoked API key." }
// 402 Insufficient credits
{ "error": "insufficient_credits", "message": "Top up credits in the dashboard." }
// 404 Not Found
{ "error": "not_found", "message": "Unknown job_id." }
// 429 Rate limited
{ "error": "rate_limited", "message": "Too many requests. Retry later." }Default rate limit: 60 requests per minute per account. Polling endpoints include Retry-After; back off ≥5 seconds if not provided to avoid 429 responses.
Quick fixes before emailing us.
Wrong or rotated key. Generate a new one in Dashboard → API Keys.
Buy credits in Dashboard → Billing, then retry the request.
Use the Retry-After header or a ≥5s exponential backoff between polls.
Prefer PDFs with a text layer; OCR or export to PDF/A before uploading.