# STRING

**Canonical:** https://apis.io/providers/string-db/  
**Website:** https://string-db.org  
**APIs profiled:** 7

STRING is a protein-protein interaction network database providing scored associations between proteins across thousands of organisms. The REST API enables programmatic access to interaction scores, network visualizations, functional enrichment analysis, homology data, and protein annotations. STRING integrates data from genomic context, co-expression, text mining, biochemical and genetic experiments, and curated databases.

## Kin Score — 35.6 / 100 (thin)

Scored 2026-08-20 under rubric 0.12.0. Trend: flat (+0.0 from 35.6).

| Facet | Score |
|---|---|
| Discoverability | 75.9 |
| Contract Quality | 59.1 |
| Governance | 9.8 |
| Contract Governance | 9.8 |
| Operational Transparency | 21.1 |
| Developer Ergonomics | 7.1 |
| Commercial Clarity | 39.5 |
| Access Clarity | 39.5 |

Regulatory layer — **Health**: 18.8 (matched via tags).

## Agent readiness — 21.4 (agent-aware)

| Dimension | Value |
|---|---|
| Spec Presence | yes |
| Agentic Access | no |
| Reversibility Documented | no |
| MCP Server | no |
| Auth Clarity | no |
| Idempotency | no |
| Error Semantics | no |
| OpenAPI Examples | partial |
| Rate Limit Signal | documented |
| Event Surface Described | no |
| Agent Skills | no |
| Well Known Catalog | no |
| Consent Identity | no |
| Agent Card | no |
| Dry Run Mode | no |

## Access

Free — onboarding: unknown, pricing: free, trial: no (confidence: medium).

## APIs (7)

- **STRING Annotation API** — Functional annotations and term lookup
- **STRING Enrichment API** — Functional enrichment analysis
- **STRING Homology API** — Protein homology and similarity scores
- **STRING Identifiers API** — Map protein names and synonyms to STRING identifiers
- **STRING Network API** — Retrieve protein-protein interaction networks
- **STRING Utility API** — Utility endpoints (version, links, API key)
- **STRING Valuesranks API** — Values/Ranks GSEA-like enrichment (requires API key)

## Security (1)

- **String Db Domain Security** — TLSv1.3

## Plans (1)

- **Plans**

## Tags

Bioinformatics, Proteins, Genomics, Life Sciences, Research, Open Data

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Profiled by [API Evangelist](https://apievangelist.com) and published on [APIs.io](https://apis.io/providers/string-db/). Scores are computed from the provider's own public artifacts under a published rubric.