# NCBI GenBank Nucleotide Sequence Metadata Lookup

> NCBI GenBank Nucleotide Sequence Metadata Lookup is a paid API for AI agents from api.healthtravel-api.workers.dev, paid per call via x402, $0.002/call, status unknown (last checked 2026-10-29).

Searches NCBI GenBank nucleotide (nuccore) records by accession or search term and returns metadata including accession, title, sequence length, organism, molecule type, and last update date (no raw sequence).

## Facts

- Endpoint: GET https://api.healthtravel-api.workers.dev/api/health/genbank-nucleotide-seq?utm_source=zero.xyz
- Price: $0.002/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-29
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/ncbi-genbank-nucleotide-sequence-metadata-lookup-6b251a54
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_60_nAMMGIIv2S4o8b45WW

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 ncbi-genbank-nucleotide-sequence-metadata-lookup-6b251a54
```

Example prompt: Look up the NCBI GenBank nucleotide record for accession NM_000546 and tell me the organism, molecule type, sequence length, and when it was last updated.

## When to prefer this

Use this endpoint when you need quick metadata about one or more NCBI GenBank nucleotide records without needing the full raw sequence. It is ideal for verifying accessions, checking organism and molecule type, or retrieving sequence length and title for up to 10 records at once. Prefer this over full-sequence downloads when bandwidth, cost, or processing overhead of raw FASTA data is a concern.

## Known failure modes

- Accession not found — returns empty results if the accession does not exist in GenBank
- Invalid search term format — query contains disallowed characters or is outside the 2–100 character limit
- Ambiguous search term returns unrelated records — broad terms may surface many loosely matched records
- NCBI API rate limiting or downtime — upstream service temporarily unavailable
- Max parameter out of range — values outside 1–10 may be rejected or ignored

## How this service works

NCBI GenBank nucleotide record search (nuccore): accession with version, title, sequence length, organism, molecule type and last update date. Metadata only, no sequence. Accepts an accession (e.g. NM_000546), a gene or any NCBI search term. Up to 10 records per call.

## Output

Returns up to 10 GenBank nucleotide records per call, each containing: accession number with version, record title, sequence length (in base pairs), organism name, molecule type (e.g. mRNA, DNA), and last update date. No raw nucleotide sequence is returned.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "$schema": "https://json-schema.org/draft/2020-12/schema",
 "required": [
  "input"
 ],
 "properties": {
  "input": {
   "type": "object",
   "required": [
    "type",
    "method"
   ],
   "properties": {
    "type": {
     "type": "string",
     "const": "http"
    },
    "method": {
     "enum": [
      "GET"
     ],
     "type": "string"
    },
    "queryParams": {
     "type": "object",
     "required": [
      "term"
     ],
     "properties": {
      "max": {
       "type": "string",
       "description": "How many records, 1 to 10 (default 5)"
      },
      "term": {
       "type": "string",
       "description": "Accession or search term, letters, digits, spaces, brackets, dots, hyphens, 2 to 100 characters"
      }
     }
    }
   },
   "additionalProperties": false
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/ncbi-genbank-nucleotide-sequence-metadata-lookup-6b251a54/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from api.healthtravel-api.workers.dev](https://www.zero.xyz/host/api.healthtravel-api.workers.dev/llms.txt)