# Materials Cloud

> materialscloud.org | Storage; 2 records: free tier, limits, identity cost and evidence.

HTML https://fshy.ajam.dev/p/materialscloud/ | JSON https://fshy.ajam.dev/api/v1/entity/materialscloud.json | how to read a record: https://fshy.ajam.dev/llms-full.txt

## Materials Cloud Archive (EPFL / NCCR MARVEL)

- `storage/materials-cloud-archive` | qualifies-with-caveat | evidence reported | binding per-object-cap | category academic
- identity a placeholder: card and phone unknown | verified 2026-10-21 (inherited) | stale on 2026-11-05
- url https://archive.materialscloud.org
- disagrees on identity_kind: `storage/materials-cloud-archive` says anonymous, `storage/materials-cloud-archive-2` says email
- disagrees on verdict: `storage/materials-cloud-archive` says qualifies-with-caveat, `storage/materials-cloud-archive-2` says fails-quota
- free tier: Per-record, not per-account: '5 GB for general materials science research data, 50 GB for AiiDA databases. For larger datasets please contact us.' Records are unlimited and each gets a DOI, so this is a per-record-unlimited pattern rather than a 500 GB single-shot store. | unit: GB | metered on: stored-bytes | read on: 2026-10-21 | source: [1]
- per-object cap: Per-object-cap 5 GB | bytes: 5000000000 | source: [1] | note: not stated
- retention: not stated | source: [1] | note: not stated
- egress: Free, and unusually well-instrumented: 'Access to metadata and data files is provided over standard protocols such as HTTP and OAI-PMH.' No metering. Probe: GET /record/2026.196 -> 200, 90,945 bytes of record page. | metered: no
- identity: anonymous
- interface: rest
- limits:
  - write-gated: reviewed by the Materials Cloud moderators'), scope-gated to computational materials sci [1]
  - per-object-cap (binding): Per-object-cap 5 GB [1]
- limits note: Per-object-cap 5 GB / 50 GB per record; moderation gate ('Once you submit your record for publication it will be reviewed by the Materials Cloud moderators'), scope-gated to computational materials science, and moderators explicitly police 'excessive submission rate'.
- interface detail: rest
- tooling: Email self-registration with a personal work area; HTTP + OAI-PMH read; DOI minting per record; versioning of published records. AiiDA provenance integration is the native client for the 50 GB tier.
- composes with: Unlimited records x 5 GB (or 50 GB for AiiDA databases). 100 records at 5 GB = 500 GB; the 50 GB AiiDA tier halves that to 10 records.
- reliability: EPFL-hosted and stable, but moderation is substantive (refereeable-quality requirement) and rate-policed — the opposite of an anonymous dump. Data survives; throughput is editorially throttled.
- notes: the same as the free tier
- evidence:
  - [1] 2026-10-21: 'Volume and size limitations: 5 GB for general materials science research data, 50 GB for AiiDA databases. For larger datasets please contact us'
  - [2] 2026-10-21: 'By registering with your email to the Materials Cloud Archive...' (open self-registration), moderated before publication
  - withheld 2026-10-21: probe: GET /record/2026.196 -> 200 (90,945 bytes); 1,551 published records live
- sources:
  - [1] https://archive.materialscloud.org/information
  - [2] https://archive.materialscloud.org/help

## materials cloud archive

- `storage/materials-cloud-archive-2` | fails-quota | evidence reported | binding none | category rejected-provider
- identity a placeholder: card and phone unknown | verified 2026-10-21 (inherited) | stale on 2026-11-05
- url https://archive.materialscloud.org/uploads/new
- disagrees on identity_kind: `storage/materials-cloud-archive` says anonymous, `storage/materials-cloud-archive-2` says email
- disagrees on verdict: `storage/materials-cloud-archive` says qualifies-with-caveat, `storage/materials-cloud-archive-2` says fails-quota
- free tier: InvenioRDM node with a hard login wall before any upload; publishing is tied to a Materials Cloud workflow rather than open deposit. | unit: none | metered on: none | read on: 2026-10-21 | source: [1]
- per-object cap: not recorded | source: [1] | note: not recorded
- retention: not recorded | source: [1]
- egress: not recorded | metered: no
- identity: email
- interface: unknown
- tooling: not recorded
- composes with: the same as tooling
- reliability: the same as the free tier
- notes: the same as the free tier
- extras:
  - dead_end.failure_class: quota
  - dead_end.why: InvenioRDM node with a hard login wall before any upload; publishing is tied to a Materials Cloud workflow rather than open deposit.
  - dead_end.first_recorded: 2026-10-21
- evidence:
  - [1] 2026-10-21: InvenioRDM node with a hard login wall before any upload; publishing is tied to a Materials Cloud workflow rather than open deposit.
  - [2] 2026-10-21: cited as the basis of the rejection: InvenioRDM node with a hard login wall before any upload; publishing is tied to a Materials Cloud workflow rather than open deposit.
- sources:
  - [1] https://archive.materialscloud.org/uploads/new
  - [2] https://archive.materialscloud.org/api/records?size=1