# BlockchainSecurity Asset Resolve via x402 Payment Firewall

> BlockchainSecurity Asset Resolve via x402 Payment Firewall is a paid API for AI agents from base-agent-preflight.bytoken2023.workers.dev, paid per call via x402, $0.005/call, status unknown (last checked 2026-09-15).

Resolves blockchain asset symbols and contract addresses to detailed asset metadata for a specified blockchain network, proxied through an x402 micropayment gateway.

## Facts

- Endpoint: GET https://base-agent-preflight.bytoken2023.workers.dev/v1/x402/bcs/resolve
- Price: $0.005/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-15
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/blockchainsecurity-asset-resolve-via-x402-payment-firewall-6bc2ed6a
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_cg09rRIZ_4n7xqs9SdTm-

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 blockchainsecurity-asset-resolve-via-x402-payment-firewall-6bc2ed6a
```

Example prompt: Can you resolve the asset metadata for the symbols USDC,ETH on the base blockchain — I want to see what contract addresses and details come back for each token.

## When to prefer this

Use this endpoint when you need to resolve blockchain asset symbols or contract addresses to structured metadata on a specific chain, particularly when operating in an x402 micropayment-enabled agent pipeline. Prefer this over generic chain explorers when you need programmatic, structured JSON output for downstream agent consumption and are already integrated with x402 payment flows.

## Known failure modes

- Missing required 'blockchain' query parameter returns validation error
- Invalid or unrecognized blockchain slug returns empty or error response
- Symbol pattern mismatch (invalid characters) returns 400-level error
- Contract address format violation returns validation error
- Payment failure or insufficient USDC balance blocks the request via x402
- Unknown symbols may return empty data object with no results
- Rate limiting or worker timeout may return 5xx errors

## How this service works

Machine-payable service intelligence for discovering, verifying, and monitoring identity, risk, authorization, execution-preflight, and evidence APIs before autonomous agents spend.

## Output

A JSON object containing the product name ('bcs-asset-resolve'), upstream service identifier ('blockchainsecurity-atlantis'), a request ID, and an upstream_response.data object with resolved asset metadata for the queried symbols or contract addresses on the specified blockchain.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "$schema": "https://json-schema.org/draft/2020-12/schema",
 "required": [
  "input"
 ],
 "properties": {
  "input": {
   "type": "object",
   "required": [
    "type",
    "method"
   ],
   "properties": {
    "type": {
     "type": "string",
     "const": "http"
    },
    "method": {
     "enum": [
      "GET"
     ],
     "type": "string"
    },
    "queryParams": {
     "type": "object",
     "required": [
      "blockchain"
     ],
     "properties": {
      "symbols": {
       "type": "string",
       "pattern": "^[A-Za-z0-9,._-]{1,240}$",
       "description": "Comma-separated symbols to resolve."
      },
      "contracts": {
       "type": "string",
       "pattern": "^[A-Za-z0-9,:._-]{1,1000}$",
       "description": "Optional comma-separated contract addresses to resolve."
      },
      "blockchain": {
       "type": "string",
       "pattern": "^[a-z0-9_-]{2,32}$",
       "description": "BlockchainSecurity blockchain slug."
      }
     }
    }
   },
   "additionalProperties": false
  },
  "output": {
   "type": "object",
   "required": [
    "type"
   ],
   "properties": {
    "type": {
     "type": "string"
    },
    "example": {
     "type": "object",
     "required": [
      "product",
      "upstream_service",
      "upstream_response"
     ],
     "properties": {
      "product": {
       "type": "string"
      },
      "request": {
       "type": "object"
      },
      "provenance": {
       "type": "object"
      },
      "upstream_headers": {
       "type": "object"
      },
      "upstream_service": {
       "type": "string"
      },
      "upstream_response": {
       "type": "object"
      }
     }
    }
   }
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "product": "bcs-asset-resolve",
  "upstream_headers": {
   "request_id": "example-request-id",
   "credit_cost": null,
   "credit_remaining": null
  },
  "upstream_service": "blockchainsecurity-atlantis",
  "upstream_response": {
   "data": {},
   "meta": {
    "request_id": "example-request-id"
   }
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/blockchainsecurity-asset-resolve-via-x402-payment-firewall-6bc2ed6a/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from base-agent-preflight.bytoken2023.workers.dev](https://www.zero.xyz/host/base-agent-preflight.bytoken2023.workers.dev/llms.txt)