# Silverback Arbitrage Scanner

> Silverback Arbitrage Scanner is a paid API for AI agents from silverback-x402.onrender.com, paid per call via x402, $0.030000/call, status down (last checked 2026-09-16).

Finds price discrepancies for a token pair across DEX aggregators on Base chain

## Facts

- Endpoint: GET https://silverback-x402.onrender.com/api/v1/arbitrage-scanner
- Price: $0.030000/call
- Payment: x402
- Status: down
- Last checked: 2026-09-16
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/silverback-x402-onrender-com-699d1aa9
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_H779zP5JX0LxJm7dlAl4X

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 silverback-x402-onrender-com-699d1aa9
```

Example prompt: Check if there are any price discrepancies between DEX aggregators for swapping ETH to USDC — use an amount of 1.

## When to prefer this

Use this endpoint when you need to identify price inefficiencies between DEX aggregators for a specific token pair on Base chain, especially before executing a swap to determine if arbitrage is viable. Prefer this over general price feeds when you specifically need cross-aggregator spread analysis rather than a single best price.

## Known failure modes

- Missing required tokenIn or tokenOut query parameters returns validation error
- Unsupported or unrecognized token symbol/address returns error
- No liquidity found for the token pair results in empty or null data
- Payment of $0.03 USDC not provided returns 402 Payment Required
- Service temporarily unavailable on render.com free tier (cold start delays)

## How this service works

Find price discrepancies between DEX aggregators

## Output

Returns a structured response indicating whether arbitrage opportunities exist between DEX aggregators for the given token pair, including price quotes from different aggregators, the spread or discrepancy amount, and success/failure status.

## Example request

```json
{
 "input": {
  "type": "http",
  "method": "GET",
  "queryParams": {
   "amount": "1",
   "tokenIn": "ETH",
   "tokenOut": "USDC"
  }
 },
 "output": {
  "type": "object",
  "example": {
   "data": {},
   "success": true
  }
 }
}
```

## 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": [
      "tokenIn",
      "tokenOut"
     ],
     "properties": {
      "amount": {
       "type": "string",
       "description": "Amount to check (default: 1)"
      },
      "tokenIn": {
       "type": "string",
       "description": "Input token symbol or address"
      },
      "tokenOut": {
       "type": "string",
       "description": "Output token symbol or address"
      }
     }
    }
   },
   "additionalProperties": false
  },
  "output": {
   "type": "object",
   "required": [
    "type"
   ],
   "properties": {
    "type": {
     "type": "string"
    },
    "example": {
     "type": "object",
     "required": [
      "success"
     ],
     "properties": {
      "data": {
       "type": "object"
      },
      "success": {
       "type": "boolean"
      }
     }
    }
   }
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "object",
 "required": [
  "data",
  "success"
 ],
 "properties": {
  "data": {
   "type": "object",
   "required": [
    "pair",
    "amount",
    "quotes",
    "timestamp",
    "opportunities",
    "sourcesQueried",
    "estimatedGasCostUsd"
   ],
   "properties": {
    "pair": {
     "type": "string"
    },
    "amount": {
     "type": "string"
    },
    "quotes": {
     "type": "array",
     "items": {
      "type": "unknown"
     }
    },
    "timestamp": {
     "type": "string"
    },
    "opportunities": {
     "type": "array",
     "items": {
      "type": "object",
      "required": [
       "message"
      ],
      "properties": {
       "message": {
        "type": "string"
       }
      }
     }
    },
    "sourcesQueried": {
     "type": "number"
    },
    "estimatedGasCostUsd": {
     "type": "string"
    }
   }
  },
  "success": {
   "type": "boolean"
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/silverback-x402-onrender-com-699d1aa9/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from silverback-x402.onrender.com](https://www.zero.xyz/host/silverback-x402.onrender.com/llms.txt)