UniProt Accession to ChEMBL Target Ids (CROssBAR)

crossbar/target-lookup

The ChEMBL target ids that contain a UniProt accession (for example P04637, human p53, answers CHEMBL4096 plus complexes and protein families that include it), up to `limit` rows (1 to 25, default 10) on a zero-based `page`. Use the ids with crossbar/target-activities. An accession with no ChEMBL target is answered by the provider with an empty 404, which surfaces as an error rather than an empty list. ChEMBL and UniProt data via the EMBL-EBI CROssBAR API, passed through unmodified and served by Eden Engine; not an official EMBL-EBI 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

EMBL-EBI

Data from the CROssBAR Data API (EMBL-EBI), drawing on ChEMBL (CC BY-SA 3.0) and UniProt (CC BY 4.0); EMBL-EBI expects attribution (https://www.ebi.ac.uk/about/terms-of-use). Served by Eden Engine; not an official EMBL-EBI 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.

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agent

// 1. search: find the tool
omnial_search({ query: "what you need" })

// 2. inspect: price and input schema
omnial_inspect({ tool: "crossbar/target-lookup" })

// 3. learn: read the usage guide at runtime
omnial_learn({ tool: "crossbar/target-lookup" })

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

Charge	Price
Per call	$0.0026

Updated: Oct 25, 2026

Input and output schemas

Input schema

input_schema.json

{
  "type": "object",
  "required": [
    "accession"
  ],
  "properties": {
    "page": {
      "type": "integer",
      "default": 0,
      "maximum": 100000,
      "minimum": 0,
      "description": "Zero-based page number of `limit` rows each. Default 0."
    },
    "limit": {
      "type": "integer",
      "default": 10,
      "maximum": 25,
      "minimum": 1,
      "description": "Most rows to return, 1 to 25. Default 10."
    },
    "accession": {
      "type": "string",
      "pattern": "^([OPQ][0-9][A-Z0-9]{3}[0-9]|[A-NR-Z][0-9]([A-Z][A-Z0-9]{2}[0-9]){1,2})$",
      "description": "A UniProt accession in capitals, for example P04637. Isoform suffixes such as P04637-2 are not accepted."
    }
  },
  "additionalProperties": false
}

Output schema

output_schema.json

{
  "type": "object",
  "required": [
    "targets",
    "pageMeta"
  ],
  "properties": {
    "targets": {
      "type": "array",
      "items": {
        "type": "object",
        "required": [
          "target_chembl_id",
          "accession"
        ],
        "properties": {
          "accession": {
            "type": "string",
            "description": "The UniProt accession asked for."
          },
          "target_chembl_id": {
            "type": "string",
            "description": "ChEMBL target id."
          }
        },
        "additionalProperties": true
      }
    },
    "pageMeta": {
      "type": "object",
      "properties": {
        "limit": {
          "type": "integer"
        },
        "totalPages": {
          "type": "integer"
        },
        "currentPage": {
          "type": "integer"
        },
        "totalElements": {
          "type": "integer"
        },
        "currentElements": {
          "type": "integer"
        }
      },
      "description": "Paging block: currentElements, currentPage (0-based), limit, totalElements, totalPages.",
      "additionalProperties": true
    }
  },
  "description": "One page of ChEMBL target ids for the accession, with the paging block.",
  "additionalProperties": true
}