The open peptide catalog API

Build on the same 28-peptide reference that powers this site — mechanism, sequence, and PubChem-enriched chemistry as structured JSON. No key, no signup. Free to embed with attribution.

Browse the catalog View live JSON

PubChem-enriched

Each entry carries mechanism, sequence, molecular weight/formula, CAS, PubChem CID, and UniProt where available.

No key required

Open GET endpoints with permissive CORS — call directly from a browser, server, or notebook.

CC BY 4.0

Free to use and redistribute with attribution back to AmericanPeptide.com.

Endpoints

GET/api/catalog

List all peptides. Supports query filters (below).

GET/api/catalog/{slug}

A single peptide by slug, e.g. /api/catalog/semaglutide.

Query parameters(list endpoint)

categoryFilter by catalog category id (e.g. metabolic).

areaFilter by research-area slug (e.g. weight-loss).

fdaSet to true to return only FDA-approved peptides.

qFree-text search over name, aliases, and description.

Example

GET /api/catalog?area=weight-loss&fda=true

{
  "version": "1.0",
  "license": "CC BY 4.0",
  "attribution": "AmericanPeptide.com",
  "documentation": "https://www.americanpeptide.com/developers",
  "count": 2,
  "peptides": [
    {
      "slug": "semaglutide",
      "name": "Semaglutide",
      "aliases": ["Ozempic", "Wegovy", "Rybelsus"],
      "categories": ["metabolic"],
      "researchAreaGuides": [
        { "slug": "weight-loss", "label": "Weight Loss & Metabolic Health",
          "url": "https://www.americanpeptide.com/research-areas/weight-loss" }
      ],
      "molecularFormula": "C157H235N41O47",
      "pubchemCid": 56843331,
      "fdaApproved": true,
      "url": "https://www.americanpeptide.com/catalog/semaglutide"
    }
  ]
}

License & attribution

The catalog data is offered under Creative Commons Attribution 4.0. You may use, adapt, and redistribute it — including commercially — provided you credit AmericanPeptide.com with a link back to the source.

Reference data is for research and educational use only. It is not medical advice, a dosing protocol, or an offer for sale, and should be independently validated before any experimental use.