# ERC-20 Token Holder Concentration Lookup

> ERC-20 Token Holder Concentration Lookup is a paid API for AI agents from saylorinnovations.com, paid per call via x402, $0.01/call, status unknown (last checked 2026-10-18).

Returns top ERC-20 token holders with labels, balances, supply share, concentration metrics (top 1/5/10/20), and a concentration level rating from Blockscout data.

## Facts

- Endpoint: GET https://saylorinnovations.com/api/evm/token-holders?utm_source=zero.xyz
- Price: $0.01/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-18
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/erc-20-token-holder-concentration-lookup-77b96362
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_Aoi67W9EKU_XdjulCkZlx

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 erc-20-token-holder-concentration-lookup-77b96362
```

Example prompt: Can you pull the top 20 holders of the USDC token at 0xA0b86991c6218b36c1d19D4a2e9Eb0cE3606eB48 on Ethereum and tell me what the concentration level looks like — are whales dominating?

## When to prefer this

Choose this endpoint when you need on-chain ERC-20 holder concentration data including labeled wallet identities, supply share breakdowns, and a pre-computed concentration level across major EVM chains (Ethereum, Base, Optimism, Arbitrum, Polygon, Gnosis). Prefer it over raw blockchain RPC calls when you need enriched labels and aggregated concentration metrics in a single call without writing custom Blockscout queries.

## Known failure modes

- Invalid or non-contract token address returns an error or empty result
- Unsupported chain name causes a 400 or unrecognized parameter response
- Token with very few holders may return fewer results than requested
- Blockscout data unavailability for a given chain may produce stale or missing data
- Top parameter outside 1-50 range may be rejected or clamped to default

## How this service works

Top holders of an ERC-20 token with labels, balances and share of supply plus top 1, 5, 10 and 20 concentration and a concentration level from Blockscout

## Output

A JSON object containing: the queried chain and token metadata, an array of top holders with wallet addresses, labels (e.g. exchange names), balances, and percent of supply; concentration percentages for the top 1, 5, 10, and 20 holders; a categorical concentration level (e.g. high/medium/low); the number of holders returned; and an optional note providing context.

## 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": [
      "token"
     ],
     "properties": {
      "top": {
       "type": "string",
       "description": "optional 1-50, default 10"
      },
      "chain": {
       "type": "string",
       "description": "ethereum (default), base, optimism, arbitrum, polygon, gnosis"
      },
      "token": {
       "type": "string",
       "description": "Token contract 0x address"
      }
     }
    }
   },
   "additionalProperties": false
  },
  "output": {
   "type": "object",
   "required": [
    "type"
   ],
   "properties": {
    "type": {
     "type": "string",
     "const": "json"
    },
    "example": {
     "type": "object",
     "required": [
      "chain",
      "token",
      "top_holders"
     ],
     "properties": {
      "note": {
       "type": "string",
       "description": "Caveat or context for reading the result"
      },
      "chain": {
       "type": "string",
       "description": "Blockchain the data is for"
      },
      "token": {
       "type": "object",
       "description": "Token the values refer to"
      },
      "source": {
       "type": "string",
       "description": "Data source the values come from"
      },
      "top_holders": {
       "type": "array",
       "description": "Top holders"
      },
      "concentration": {
       "type": "object",
       "description": "Share of supply held by the top 1, 5, 10 and 20 holders, in percent"
      },
      "holders_returned": {
       "type": "number",
       "description": "Holders returned"
      },
      "concentration_level": {
       "type": "string",
       "description": "Concentration level"
      }
     }
    }
   }
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/erc-20-token-holder-concentration-lookup-77b96362/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from saylorinnovations.com](https://www.zero.xyz/host/saylorinnovations.com/llms.txt)