# x402-trading ERC-20 Token Search

> x402-trading ERC-20 Token Search is a paid API for AI agents from x402-trading.useotto.xyz, paid per call via x402, $0.001000/call, status unknown (last checked 2026-09-15).

Search and look up supported ERC-20 tokens by symbol or contract address across 6 blockchain networks, returning token metadata from a CoinGecko-sourced dataset of 5000+ tokens.

## Facts

- Endpoint: GET https://x402-trading.useotto.xyz/supported-tokens
- Price: $0.001000/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-15
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/x402-trading-useotto-xyz-5a473831
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_wV_ZRSlv1cVWaNHIFIhpF

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 x402-trading-useotto-xyz-5a473831
```

Example prompt: Search for the token USDC on Base (chain ID 8453) and give me its contract address and any other details you find.

## When to prefer this

Use this endpoint when you need to resolve a token symbol to a contract address (or vice versa) across major EVM chains before executing a trade, portfolio lookup, or DeFi operation. Prefer this over on-chain queries when you need fast, pre-indexed token discovery without RPC calls. It complements the sibling trading and portfolio endpoints on the same platform.

## Known failure modes

- No tokens found matching the search term on the specified chain — returns empty tokens array
- Invalid or unsupported chain ID provided — may return empty results or error
- Malformed 0x address in search param — may return no matches
- Payment failure via x402 protocol — request blocked before reaching token lookup logic
- Rate limiting or quota exhaustion — request rejected

## How this service works

Search supported ERC-20 tokens by symbol or address across 6 chains (Base, Ethereum, Arbitrum, Polygon, BSC, Avalanche). 5000+ tokens from CoinGecko.

## Output

Returns a list of matching ERC-20 tokens with their symbol, contract address, chain ID, and metadata for tokens matching the search query on the specified chain — drawn from a CoinGecko-sourced dataset of 5000+ tokens across Base, Ethereum, Arbitrum, Polygon, BSC, and Avalanche.

## Example request

```json
{
 "input": {
  "type": "http",
  "method": "GET",
  "queryParams": {
   "search": "USDC",
   "chainId": "8453"
  }
 }
}
```

## 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": [
      "chainId",
      "search"
     ],
     "properties": {
      "search": {
       "type": "string",
       "description": "Token symbol or 0x address"
      },
      "chainId": {
       "type": "string",
       "description": "Chain ID (8453=Base, 1=Ethereum, 42161=Arbitrum)"
      }
     }
    }
   },
   "additionalProperties": false
  },
  "output": {
   "type": "object",
   "required": [
    "type"
   ],
   "properties": {
    "type": {
     "type": "string"
    },
    "example": {
     "type": "object",
     "properties": {
      "status": {
       "type": "string"
      },
      "tokens": {
       "type": "array"
      }
     }
    }
   }
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/x402-trading-useotto-xyz-5a473831/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from x402-trading.useotto.xyz](https://www.zero.xyz/host/x402-trading.useotto.xyz/llms.txt)