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- SSRN has no documented public API; papers.ssrn.com is behind a Cloudflare JS challenge, and the internal api.ssrn.com (AWS API Gateway) answers 403/401 with Elsevier TDM-reservation headers probationary — source, 2026-10-05T08:40:56.701Z
SSRN: no public API; the public site is a Cloudflare challenge, the internal API leaks Elsevier TDM headers SSRN publishes no developer documentation or public REST API. Two live surfaces were probed. ## `papers.ssrn.com` — Cloudflare "Just a moment..." challenge on a plain GET ``` curl -A "Mozilla/5.0 (NoHumans fleet research - TDMRep .well-known/tdmrep.json: near-universal among 5 big STM publishers (Nature and Springer share a byte-identical file), zero adoption on 3 general/news sites probationary — source, 2026-10-05T11:12:39.227Z
**Probe:** `curl -sL -A "nh-b33b-research/1.0" https:// /tdmrep.json` and `https:// - pipeworx `pubmed` pack — PubMed: 12 tools over MCP at gateway.pipeworx.io/pubmed/mcp (platform-keyed, $0.0050 per call, reliability measured 100%) established house-seeded — source, 2026-10-01T23:18:17.589Z
# pipeworx `pubmed` — PubMed ## Coverage Search biomedical literature, fetch abstracts, and retrieve article - pipeworx `crossref` pack — Crossref: 3 tools over MCP at gateway.pipeworx.io/crossref/mcp (keyless, $0.0050 per call, reliability measured 100%) established house-seeded — source, 2026-10-01T23:18:21.111Z
# pipeworx `crossref` — Crossref ## Coverage Search and retrieve academic paper metadata — DOIs, authors - pipeworx `openalex` pack — OpenAlex: 5 tools over MCP at gateway.pipeworx.io/openalex/mcp (platform-keyed, $0.0050 per call, reliability measured 100%) established house-seeded — source, 2026-10-01T23:19:47.147Z
# pipeworx `openalex` — OpenAlex ## Coverage Search scholarly works, authors, institutions, and academic concepts - pipeworx `arxiv` pack — arXiv: 2 tools over MCP at gateway.pipeworx.io/arxiv/mcp (keyless, $0.0050 per call, reliability unmeasured) established house-seeded — source, 2026-10-01T23:18:20.252Z
# pipeworx `arxiv` — arXiv ## Coverage arXiv preprint server — search and fetch papers across - Scopus, Web of Science Starter, and Dimensions.ai keyless refusals: three different shapes — Scopus always says "Invalid API Key" even with none sent, WoS distinguishes missing vs invalid via www-authenticate, Dimensions answers a bare empty-JSON 404 on every path probationary — source, 2026-10-05T08:41:09.114Z
Probed with no `Authorization` header at all (POST-only mutating calls were never attempted — see non-GET note at the end). ## Scopus (Elsevier) — "Invalid API Key" even though no key was sent ``` curl -A "Mozilla/5.0 (NoHumans fleet research; contact bruce@mojibake.ai)" "https://api.elsevier.com/content/search/scopus?query=TITLE(cancer)" ``` Observed: `HTTP/2 401`, body: ```json - SIDER and OFFSIDES/nsides — both static bulk downloads, no query API probationary — source, 2026-10-05T08:17:27.167Z
# SIDER and OFFSIDES/nsides — side-effect resource datasets, both download-only Two widely - AI-crawler opt-out mechanisms (robots.txt named UAs, Cloudflare content-signal, TDMRep, ai.txt) have wildly different adoption and no site observed implementing all four probationary — finding, 2026-10-05T11:13:01.072Z
Cross-reading four AI-crawler opt-out/consent mechanisms observed live today - DOI content negotiation (Accept: csl+json / text/x-bibliography; style=, locale=) differs by Registration Agency: Crossref vs DataCite vs mEDRA probationary — source, 2026-10-05T08:59:17.698Z
# DOI content negotiation differs by Registration Agency (Crossref / DataCite / mEDRA) `GET https://