oanor
Sign up free
Marketplace Pricing Features Sign in

API · /string-api

STRING API

healthy 4,690 Subscribers

The STRING protein–protein interaction database as an API — the curated and predicted network of functional associations between proteins, powered by the official STRING API. Resolve gene or protein names to STRING identifiers with annotations; get a protein's top interaction partners with a combined confidence score and per-channel evidence (experimental, curated databases, co-expression, text-mining, gene fusion, neighbourhood and co-occurrence); build the interaction network among a set of proteins as scored edges; run functional enrichment of a gene set over Gene Ontology, KEGG, Reactome, Pfam, InterPro and more with p-values and false-discovery rates; and score homology between proteins. Covers 12,000+ organisms (default human, NCBI taxon 9606). Ideal for systems-biology and network-biology pipelines, gene-set and pathway analysis, drug-target and disease-gene research, and bioinformatics dashboards.

#string #protein-interactions #network-biology #systems-biology #bioinformatics #enrichment #life-sciences
api.oanor.com/string-api
Get an API key Try in playground → Contact provider

Machine-readable spec so AI agents can integrate this API.

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

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

STRING API — live data on the oanor API marketplace

API health

healthy
Uptime
100.00%
Server probes · 24h
Avg latency
324 ms
Server probes · 24h
Subscribers
4,690
active
Total calls
114
last 7 days
status Full status page → · 18 probes/24h

Pricing

Pick a tier — billed monthly, cancel anytime.

Free

Free

  • 530 calls / month
  • 2 requests / second
  • Hard cap (429 above quota, no overage)
  • 530 calls/month
  • 2 req/sec
  • Resolve, partners & network
  • No credit card
Sign in to subscribe

Starter

€7.15 /month

  • 19,500 calls / month
  • 6 requests / second
  • Hard cap (429 above quota, no overage)
  • 19.5k calls/month
  • 6 req/sec
  • Interaction partners & networks
  • Email support
Sign in to subscribe

Pro

€21.70 /month

  • 89,000 calls / month
  • 15 requests / second
  • Hard cap (429 above quota, no overage)
  • 89k calls/month
  • 15 req/sec
  • Enrichment & homology
  • Priority support
Sign in to subscribe

Mega

€59.00 /month

  • 345,000 calls / month
  • 40 requests / second
  • Hard cap (429 above quota, no overage)
  • 345k calls/month
  • 40 req/sec
  • High-throughput network biology
  • Dedicated SLA
Sign in to subscribe

Built by

P
PremiumApi

Related APIs

Other APIs with overlapping tags.

Pad API — oanor API marketplace

Pad API

Pad and align strings to a target width. The pad endpoint adds a fill character to the start, end, or both sides of a value until it reaches the width you ask for — zero-pad a number (7 → 007), right-align a price column, centre a heading, or build a fixed-width field — with any fill string (space, 0, dash, dots) and an optional truncate flag to cut values that are already too long. The align endpoint takes a whole list of lines (or newline-separated text) and pads every line to a common width, so columns line up in fixed-width tables, ASCII layouts, receipts, invoices and logs. Width is counted in Unicode code points, so emoji and accented letters each count as one and never get split. Pure local computation — no key, no third-party service, instant. Live, nothing stored. 3 endpoints. This pads to a width; to wrap long text across lines use a word-wrap API, and to convert between case styles use a text-case API.

api.oanor.com/pad-api

 Text Tools API — oanor API marketplace

Text Tools API

A fast, fully-local text-utilities toolkit: convert between 10 case styles (upper, lower, title, sentence, camelCase, PascalCase, snake_case, kebab-case, CONSTANT_CASE, dot.case), generate URL-friendly slugs, compute text statistics (word, character, sentence, line and paragraph counts, average word length and reading time), and produce lorem-ipsum placeholder text by words, sentences or paragraphs. Pure server-side compute, no third-party upstream, so responses are instant and always available. Ideal for CMS, editors, developer tools, forms and content pipelines.

api.oanor.com/text-api

 Protein Interactions API — oanor API marketplace

Protein Interactions API

Protein-protein interaction networks as an API — powered by STRING, the database of known and predicted protein associations that combines evidence from laboratory experiments, curated pathway databases, gene co-expression, genomic context and automated text mining into a single confidence score, across thousands of organisms. Get a protein's top interaction partners (each with the combined confidence score and the seven evidence-channel subscores), the interaction network among any set of proteins as scored edges, and functional enrichment for a gene set — the over-represented GO terms, KEGG pathways, Pfam domains and more, each with its p-value, FDR and member genes. Pass gene symbols (TP53) or STRING/Ensembl ids, for human (default) or any species by NCBI taxon id. It is a cornerstone of systems biology — ideal for network analysis, functional genomics, pathway and bioinformatics tools. A protein-interaction-network resource — distinct from biological pathways (Reactome), curated protein complexes (Complex Portal) and Gene Ontology annotations (QuickGO). Open data from STRING (CC BY 4.0).

api.oanor.com/stringdb-api

 BioModels API — oanor API marketplace

BioModels API

BioModels as an API, powered by EMBL-EBI — the world's largest repository of curated, published mathematical models of biological systems. BioModels collects computational models (mostly in SBML, the Systems Biology Markup Language) of metabolism, cell signalling, gene-regulatory networks, the cell cycle, disease processes and physiology, each linked to the peer-reviewed publication it comes from. /v1/search?query=glycolysis searches the repository and returns each matching model's id (such as BIOMD0000000012), name, format, submitter and submission/modification dates. /v1/model?id=BIOMD0000000012 returns a model's metadata — its name and description, the encoding format, the modelling approach (e.g. ordinary differential equation model), the curation status, the publication behind it (title, journal, year, authors) and the model files. Model ids look like BIOMD0000000012 for curated models or MODEL1234567890 for non-curated submissions; get them from the search endpoint. Ideal for systems-biology and computational-modelling tools, reproducible-research and model-reuse workflows, and teaching. Data from EMBL-EBI BioModels (CC0). This is a systems-biology / computational-model repository — distinct from sequence (UniProt, ENA), structure (PDB, AlphaFold), pathway and variant (ClinVar) databases.

api.oanor.com/biomodels-api

Frequently asked questions

Quick answers about pricing, quotas, and integration.

How do I get an API key for STRING API?
Sign up for free at oanor.com, generate an API key from the developer dashboard, and call STRING API with the x-oanor-key header. No credit card needed for the free tier.
What's the rate limit for STRING 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 STRING API cost?
STRING API has a free tier with 100 calls / month. Paid plans start at €7.15 / 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 STRING API GDPR-compliant?
All requests to STRING 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/string-api/SOME_PATH \
  -H "x-oanor-key: oanor_test_..."
const res = await fetch("https://api.oanor.com/string-api/SOME_PATH", {
  headers: { "x-oanor-key": "oanor_test_..." }
});
const data = await res.json();
$ch = curl_init("https://api.oanor.com/string-api/SOME_PATH");
curl_setopt($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/string-api/SOME_PATH",
    headers={"x-oanor-key": "oanor_test_..."},
)
print(r.json())

Ratings

Sign in to rate.

No reviews yet.

Discussion

Ask questions, share usage tips, get answers from the provider and other developers. Public — anyone can read.

Sign in to start a thread or reply.

Sign in

New thread

/ 4000

📌 Pinned 🔒 Locked

·

· ·

/ 4000

🔒 This thread is locked — no new replies.

  • No threads yet — start the discussion.

Support

Private 1:1 support with the provider — billing questions, integration issues, account problems. Only you and the provider team can see these threads.

Sign in to open a support ticket.

Sign in

Open new ticket

Describe what you need help with. The provider team gets an email and replies on the ticket page.

  • No tickets yet for this API.

Subscription active — calls can start immediately.

Send your first request —

Subscription active — copy a snippet and fire off your first call.