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OMA Protein Cross-References: UniProt, Ensembl, RefSeq IDs (OMA Browser)

omabrowser/xrefs

Lists the external identifiers OMA holds for one protein: each cross-reference has the identifier, its source (for example UniProtKB/SwissProt, UniProtKB/TrEMBL, Ensembl, RefSeq, gene name), the match type (exact or partial) and the OMA entry number and id. Use it to translate between a UniProt accession and an OMA id. OMA release data, passed through unmodified and served by Eden Engine; not an official OMA product.

activeper callv1

Price

$0.0026 per call

You pay the price shown. If a call turns out to cost more than its quote, you pay the actual price, capped at twice the quote. No monthly minimum. Top-ups start at $0.50.

Data source

OMA Browser

Data from the OMA Browser (omabrowser.org), the Orthologous MAtrix orthology database. Credit to OMA is given as a courtesy. Served by Eden Engine; not an official OMA product.

Use it

Five steps: search, inspect, learn, run, settle. No per-tool setup; your agent reaches this tool through the meta-tools it already has.

Connect once and your AI can find and run this tool, and any other it needs.

Install itCreate an account
agent
// 1. search: find the tool
omnial_search({ query: "what you need" })

// 2. inspect: price and input schema
omnial_inspect({ tool: "omabrowser/xrefs" })

// 3. learn: read the usage guide at runtime
omnial_learn({ tool: "omabrowser/xrefs" })

// 4. run: price the exact call first, then run it
omnial_execute({ tool: "omabrowser/xrefs", input: { /* see input_schema */ }, dry_run: true })
omnial_execute({ tool: "omabrowser/xrefs", input: { /* ... */ } })

// 5. settle: the call is charged when it finishes, nothing to do

Not connected yet? Point your MCP client at https://mcp.eden-engine.com/mcp, then copy a config for your client.

Pricing

Every charge this tool can incur.

ChargePrice
Per call
$0.0026
Updated
Oct 21, 2026

Input and output schemas

Input schema
input_schema.json
{
  "type": "object",
  "required": [
    "id"
  ],
  "properties": {
    "id": {
      "type": "string",
      "pattern": "^(?!\\.\\.?$)[A-Za-z0-9_.-]{2,40}$",
      "description": "Protein identifier: a UniProt entry name such as P53_HUMAN, a UniProt accession such as P04637, or an OMA id such as HUMAN31534. Case matters for entry names."
    }
  },
  "additionalProperties": false
}
Output schema
output_schema.json
{
  "type": "object",
  "required": [
    "results"
  ],
  "properties": {
    "results": {
      "type": "array",
      "items": {
        "type": "object",
        "properties": {
          "xref": {
            "type": "string",
            "description": "The external identifier."
          },
          "omaid": {
            "type": "string"
          },
          "source": {
            "type": "string",
            "description": "Where the identifier is from, for example UniProtKB/SwissProt."
          },
          "entry_nr": {
            "type": "integer"
          },
          "seq_match": {
            "type": "string",
            "description": "exact or partial sequence match."
          }
        },
        "additionalProperties": true
      },
      "description": "One entry per external identifier."
    }
  },
  "additionalProperties": true
}