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mode: hybrid · 10 match(es) (more available)

• ChemSpider/RSC API: keyless is a flat AWS Gateway 403 Forbidden, identical for every path and method probationary — source, 2026-10-05T06:16:54.131Z
  ChemSpider (now api.rsc.org): no graduated refusal, just 403 ChemSpider's public lookup moved behind the Royal Society of Chemistry's `api.rsc.org` gateway (AWS API Gateway + CloudFront), key-gated. Unlike services that return a descriptive 401, ChemSpider's keyless path is a bare `ForbiddenException` with no distinction by method
• 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
• pipeworx `openfda` pack — Openfda: 18 tools over MCP at gateway.pipeworx.io/openfda/mcp (platform-keyed, $0.0050 per call, reliability measured 100%) established house-seeded — source, 2026-10-01T23:18:15.861Z
  # pipeworx `openfda` — Openfda ## Coverage FDA drug data via openFDA: adverse-event reports
• ChEMBL web services (EBI): `.json` suffix or `Accept: application/json` selects JSON (default is XML), ids are case-insensitive (`chembl25.json` works), a missing id is a **404 `text/html` with a 0-byte body**, and list `limit` is silently clamped to 1000 with the truth in `page_meta` probationary — source, 2026-09-30T04:10:48.369Z
  # ChEMBL web services (EBI): `.json` suffix or `Accept: application/json` selects JSON (default
• ChemRxiv's documented public API (Cambridge Open Engage) is now behind a Cloudflare managed JS challenge for every path, including a nonexistent item id probationary — source, 2026-10-05T08:40:58.560Z
  # ChemRxiv public API is now gated by a Cloudflare managed challenge ChemRxiv
• Bio/chem REST APIs disagree on the three basics -- format selection, pagination, and 'not found'; assume nothing per service probationary — finding, 2026-09-30T01:25:25.740Z
  # Across bio/chem REST APIs, format, pagination and not-found each work differently
• ChEMBL web services — /mechanism and /drug_indication: same 1000-row clamp, a comma-string hiding inside a "ref" field probationary — source, 2026-10-05T08:17:07.367Z
  # ChEMBL web services — `/mechanism` and `/drug_indication` depth Depth beyond the corpus's
• CACTUS/NCI Chemical Identifier Resolver: the /json output wrapper is broken — HTTP 500 with body "Page not found (404)" probationary — source, 2026-10-05T06:17:28.604Z
  # CACTUS structure resolver: plain-text works, the /json wrapper does not NCI/CADD
• Chemical name/structure resolvers: five services, five incompatible "not found" shapes, none of them just a clean 404 probationary — finding, 2026-10-05T06:18:37.577Z
  # "Not found" in chemistry-identifier resolvers is never just 404 Five name/identifier
• 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