Explore APIs

Find hard-to-source, discontinued, or obscure products and return ranked purchase-ready matches with evidence.

Rolling mean return and rolling annualized volatility over a window, from a price or return series you supply.

Blackbody radiation: Wien peak wavelength and frequency, Stefan-Boltzmann power per area, and total power for an area or sphere.

Entity/relationship graph over a synthetic audit corpus, with source excerpts.

Look inside Rail Verified-Pairs v2 for 1 USDC: the public 200-pair sample (37,173 bytes JSONL) delivered through the paid path with a signed Ed25519 receipt (verifiable offline against /x402/key). The full file, 52,243 compiler-verified Rail pairs (805,232 bytes tar.gz), is the same flow at https://ledatic.org/x402/rail-verified-pairs-v2 for 199 USDC.

Validate a Shopify product CSV before import and detect structural and Shopify-specific import problems. Also supports generic CSV structural validation.

Hospital quality verdict by facility name or CMS Certification Number (CCN). Returns the CMS overall star rating plus per-measure-group verdicts (mortality, safety of care, readmission, patient experience/HCAHPS, timely & effective care) built from CMS's published better/no-different/worse measure counts versus national benchmarks, hospital type, ownership, and emergency-services flag. Source: CMS

Paginated list of merchants (top recipients by volume)

Purchase microcredits for gateway services

YGOPRODeck Yu-Gi-Oh card lookup (keyless). POST {name|fname|id}. Unpaid empty → 402; after settle empty/invalid → 400 charged:false. Soft disclose scryfall-cards. Response trimmed (no full card_sets dump).

WoRMS Aphia marine taxonomy lookup (keyless, marine-scoped). POST {q|name|scientificname}. Empty -> 400 not charged.

World Bank API v2 indicator by country (keyless). POST {country,indicator} and/or {date?}. Empty → 404 not charged.

World Bank country metadata (keyless). POST {country|code|id}. Unpaid empty → 402; after settle empty/invalid → 400 charged:false. Soft disclose worldbank-indicator / country-info.

USGS volcano elevated CAP alerts (keyless getCapElevated). POST {alert_level?} or {include_all:true}. Empty {} -> 400 not charged. earthquake/usgs-landslides/eonet/fema/humdata adjacency disclosed.

USGS FDSN landslide events (keyless; eventtype=landslide). POST {starttime?}/{endtime?}/{limit?}. Empty -> 400 not charged. earthquake/fema/eonet/humdata adjacency disclosed.

USGS EPQS point elevation (keyless). POST {lon,lat} and/or {x,y,units?}. Timeout ≤10s. Empty/5xx → 502/404 not charged.

UK national carbon intensity (keyless, UK-scoped). POST {period|from|to}. Empty -> 400 not charged.

US Treasury FiscalData Debt to the Penny (keyless). POST {limit?}/{sort?}/{filter?}. Empty -> 400 not charged. Distinct treasury fiscal lane — disclose usaspending adjacency.

Software Heritage origin metadata (keyless). POST {url} origin URL. Unpaid empty → 402; after settle empty/invalid → 400 charged:false. Light adjacency: github-repo-meta (live GitHub meta ≠ SWH archive origin).

On-page SEO audit of one fetched public URL (title/meta/headings/alt/keywords). Amp port. Verify-before-settle; 422 if fetch blocked.

Gap table vs ≤3 competitors using seo-v2 checks. Amp port as seo-compare (NOT seo-v2 product). Verify-before-settle; 422 if blocked.

SEC company ticker→CIK lookup (keyless company_tickers.json). POST {ticker} and/or {cik}/{title_query}. Miss → 404 not charged.

NLM RxNorm drug name↔RxCUI lookup (keyless). POST {name} and/or {rxcui}. Empty idGroup → 404 not charged.

RIPE Stat prefix→ASN/holder overview (keyless). POST {resource}/{prefix?} required. Empty -> 400 not charged. peeringdb-net / whois-rdap-ip adjacency disclosed.

RCSB PDB entry metadata (keyless). POST {pdb_id}. Empty → 404 not charged.

Public holidays via Nager.Date (keyless). ISO country + year → holiday list.

PubChem PUG REST compound name/CID properties (keyless). POST {name} and/or {cid}. Empty → 404 not charged.

PokéAPI pokemon lookup (keyless). POST {name|id|pokemon}. Unpaid empty → 402; after settle empty/invalid → 400 charged:false. MUST project/trim — never returns full ~309KB dump. Soft disclose dnd5e-spell / steam-appdetails (games).

PeeringDB network/ASN lookup (keyless). POST {asn}/{name?}/{id?}. Empty -> 400 not charged. Distinct peering/IX lane — disclose rdap/ripe adjacency lightly.

PDBe PDB entry summary (keyless; PDBe/RCSB-adjacent). POST {id|pdb_id|q}. Empty -> 400 not charged.