# EBI Complex Portal Search

> EBI Complex Portal Search is a paid API for AI agents from clonecho.builda.company, paid per call via x402, $0.02/call, status unknown (last checked 2026-09-16).

Search the EBI Complex Portal database of curated macromolecular complexes by a free-text query string

## Facts

- Endpoint: POST https://clonecho.builda.company/x402/s/complex-portal-search
- Price: $0.02/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-16
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/ebi-complex-portal-search-50c34017
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_pM9zxzN675bdrJbc2MmOv

Status and success rate cover calls made through Zero and Zero's own probes. Third-party monitors may report differently.

## How to call it through Zero

Zero handles the 402 payment challenge and records the run. With the Zero CLI installed (`npm i -g @zeroxyz/cli`):

```sh
zero fetch --capability ebi-complex-portal-search-50c34017 -d '<json body>'
```

Example prompt: Search the EBI Complex Portal for macromolecular complexes involving the protein 'PCNA' and return the curated complex entries.

## When to prefer this

Use this endpoint when you need curated, high-quality macromolecular complex data from the authoritative EBI Complex Portal database. Prefer this over generic protein databases when specifically looking for multi-subunit complex annotations, complex stoichiometry, or validated complex membership data.

## Known failure modes

- Empty result set when query matches no complexes in the portal
- Malformed JSON if query string contains special characters without proper encoding
- HTTP 402 if USDC payment is not included or insufficient
- Timeout if the EBI Complex Portal backend is slow or unavailable
- Ambiguous results when query term matches many unrelated complexes

## How this service works

Search the EBI Complex Portal of curated macromolecular complexes by query {q}. Query: ?q= Returns JSON.

## Output

Returns a JSON array or object containing curated macromolecular complex records matching the query, including complex identifiers, names, component proteins, organism information, and other biological annotations from the EBI Complex Portal.

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/ebi-complex-portal-search-50c34017/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from clonecho.builda.company](https://www.zero.xyz/host/clonecho.builda.company/llms.txt)