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API · /opentol-api

Open Tree of Life API

healthy 4,439 Subscribers

The tree of life as an API — powered by the Open Tree of Life, the project that unifies published phylogenetic trees and taxonomies into a single synthetic tree spanning about 2.3 million named species. Resolve any scientific name to its canonical taxon and Open Tree Taxonomy (OTT) id (cross-referenced to NCBI, GBIF and other sources); read a taxon's classification and full lineage of ancestors up the tree (genus, family, order, class, …); and compute the most recent common ancestor (MRCA) of any set of species — the heart of comparative biology and "how related are these organisms?" questions. From Homo sapiens and the great apes to any branch of plants, fungi, animals and microbes, it is ideal for biology, evolution, ecology, education and bioinformatics tools. An evolutionary-tree / phylogenetics reference — distinct from species-occurrence data (biodiversity / GBIF), marine taxonomy (WoRMS) and sequence databases. Open data from the Open Tree of Life project (CC0).

#phylogenetics #taxonomy #tree-of-life #biology #evolution #science
api.oanor.com/opentol-api
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Machine-readable spec so AI agents can integrate this API.

/api/opentol-api/openapi.json
/api/opentol-api/llms.txt

Discovery: GET /api/index.json lists every API.

API health

healthy
Uptime
100.00%
Server probes · 24h
Avg latency
377 ms
Server probes · 24h
Subscribers
4,439
active
Total calls
20
last 7 days
status Full status page → · 24 probes/24h

Pricing

Pick a tier — billed monthly, cancel anytime.

Free

Free

  • 2,600 calls / month
  • 2 requests / second
  • Hard cap (429 above quota, no overage)
  • 2,600 calls/month
  • 2 req/sec
  • Name match + taxon + MRCA
  • No credit card
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Starter

€7.10 /month

  • 53,000 calls / month
  • 8 requests / second
  • Hard cap (429 above quota, no overage)
  • 53k calls/month
  • 8 req/sec
  • Full lineage + synonyms
  • Email support
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Pro

€22.50 /month

  • 245,000 calls / month
  • 20 requests / second
  • Hard cap (429 above quota, no overage)
  • 245k calls/month
  • 20 req/sec
  • Biology & evolution apps
  • Priority support
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Mega

€59.50 /month

  • 870,000 calls / month
  • 50 requests / second
  • Hard cap (429 above quota, no overage)
  • 870k calls/month
  • 50 req/sec
  • Phylogenetics platform
  • Dedicated SLA
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Related APIs

Other APIs with overlapping tags.

WoRMS Marine Species API

The World Register of Marine Species (WoRMS) as an API — the authoritative, expert-curated taxonomic register of the world's marine life, maintained by a global network of taxonomists. WoRMS provides the accepted scientific names, naming authorities, taxonomic status and synonymy, full classification and vernacular (common) names for marine species. /v1/search?name=Orcinus orca searches species by scientific name (set fuzzy=true for partial matching, marine_only=true to restrict to marine taxa), returning each match's AphiaID (WoRMS' stable identifier), accepted name, authority, rank, taxonomic status, valid name and higher classification. /v1/species?id=137102 returns a species' full record by AphiaID — name and authority, status, the kingdom-to-genus classification, marine and brackish flags, and citation. /v1/classification?id=137102 returns the complete taxonomic tree from Biota down to the taxon, rank by rank. /v1/vernaculars?id=137102 returns the common names with their language. Get an AphiaID from /v1/search, then look up its details, tree or common names. Ideal for marine biology, fisheries science, ecology, aquaculture and biodiversity-data harmonisation. Data from WoRMS (CC BY). This is authoritative marine taxonomy and nomenclature — distinct from species-occurrence/biodiversity databases (such as GBIF) and from sequence or genome databases.

api.oanor.com/worms-api

UniProt API

The UniProt protein knowledge base as an API, powered by the official UniProt REST service curated by EMBL-EBI, SIB and PIR. Look up any protein by its UniProt accession for protein and gene names, organism, length, mass, function, keywords, Gene Ontology (GO) terms and linked PDB 3D structures; run full-text protein searches filtered by organism (NCBI taxon id) and Swiss-Prot review status; fetch amino-acid sequences with FASTA, molecular weight and CRC64 checksum; list sequence features such as signal peptides, chains, domains, active and binding sites, modified residues and natural variants, with a by-type breakdown; resolve NCBI taxonomy nodes with their full lineage; and pull reference proteomes with protein counts and genome-assembly ids. Across all kingdoms of life, from human to bacteria. Ideal for bioinformatics pipelines, drug-discovery and proteomics tools, sequence-analysis dashboards, academic research apps and life-science chatbots.

api.oanor.com/uniprot-api

Biodiversity API

Match scientific or common species names to the GBIF taxonomic backbone (kingdom to species), search the global species catalogue, fetch full taxon records with vernacular names, and retrieve geo-located occurrence observations. Ideal for nature, education, research, conservation and citizen-science apps.

api.oanor.com/biodiversity-api

Digimon API

The Digimon universe as an API — every Digital Monster with its evolution stage (Baby through Mega/Ultimate), types, attributes (Vaccine, Virus, Data, Free), fields, signature skills, release date and full prior/next evolution lines. Look up a Digimon by name or id (e.g. Agumon → Child stage, Reptile type, with its 88 possible evolutions and 18 skills), search the database and filter by attribute, level, type or field (e.g. all Vaccine Adults), and browse the reference taxonomies. Each entry carries artwork and an English description. Backed by the open digi-api.com dataset. Ideal for fan sites, evolution and team-building tools, trivia and quiz games, Discord bots and any Digimon app.

api.oanor.com/digimon-api

Frequently asked questions

Quick answers about pricing, quotas, and integration.

How do I get an API key for Open Tree of Life API?
Sign up for free at oanor.com, generate an API key from the developer dashboard, and call Open Tree of Life API with the x-oanor-key header. No credit card needed for the free tier.
What's the rate limit for Open Tree of Life API?
Free tier allows 1 request per second. Paid plans scale up to 50 requests per second on the Mega tier. Hard limits return HTTP 429 above the quota — no surprise overage charges.
How much does Open Tree of Life API cost?
Open Tree of Life API has a free tier with 100 calls / month. Paid plans start at €7.10 / month with higher quotas and faster rate limits.
Can I cancel my subscription anytime?
Yes. Plans are billed monthly and you can cancel anytime from your billing dashboard. No long-term contracts and no cancellation fee.
Is Open Tree of Life API GDPR-compliant?
All requests to Open Tree of Life API go through our EU-based gateway. Your upstream API key never leaves our server and no personal data is shared with the upstream provider beyond the request you send.

Pick an endpoint from the list on the left to see its details and try it.

Code snippets

Sign up to get an API key, then call any path under your slug.

curl https://api.oanor.com/opentol-api/SOME_PATH \
  -H "x-oanor-key: oanor_test_..."
const res = await fetch("https://api.oanor.com/opentol-api/SOME_PATH", {
  headers: { "x-oanor-key": "oanor_test_..." }
});
const data = await res.json();
$ch = curl_init("https://api.oanor.com/opentol-api/SOME_PATH");
curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
curl_setopt($ch, CURLOPT_HTTPHEADER, ["x-oanor-key: oanor_test_..."]);
$response = curl_exec($ch);
import requests
r = requests.get(
    "https://api.oanor.com/opentol-api/SOME_PATH",
    headers={"x-oanor-key": "oanor_test_..."},
)
print(r.json())

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