# Xerxes Base Object Lookup

> Xerxes Base Object Lookup is a paid API for AI agents from ari001.tailb4ac3a.ts.net, paid per call via x402, $0.01/call, status unknown (last checked 2026-09-15).

Resolves a Base blockchain address to its typed object kind (EOA, ERC-20, Uniswap pool, etc.) along with token metadata, bytecode size, and transaction proof anchors.

## Facts

- Endpoint: GET https://ari001.tailb4ac3a.ts.net/v1/base/object/%7Baddr%7D
- Price: $0.01/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-15
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/xerxes-base-object-lookup-7c27bc86
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_SWYw2FAbmIB0qj3MyXM9Y

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 xerxes-base-object-lookup-7c27bc86
```

Example prompt: What kind of object is the Base address 0x833589fcd6edb6e08f4c7c32d4f71b54bda02913 — is it an ERC-20 token or something else, and if so what are its token name, symbol, decimals, and the block proof confirming it exists?

## When to prefer this

Use this endpoint when you need to classify a Base address by type and retrieve rich metadata in a single call — especially when you need both the object kind (EOA vs ERC-20 vs Uniswap pool) and a cryptographic block proof in one response. Prefer this over raw RPC calls when you want typed, structured output without parsing raw eth_getCode or eth_call yourself. Best suited for agents that need on-chain object classification on Base L2 specifically.

## Known failure modes

- Invalid or malformed address returns an error or ok:false
- Address not found on Base mainnet (wrong chain) returns null or empty kind
- RPC node unavailability causes timeout or 5xx
- Non-checksummed address may fail validation
- Rate limiting or payment verification failure returns 402 or 429

## How this service works

ARYSPHERE Base typed objects and transaction proofs behind x402. Dead RPC is unreadability, not zeros.

## Output

Returns a JSON object with: `ok` (success flag), `kind` (string — 'eoa', 'erc20', 'uniswap_v2', 'uniswap_v3', etc.), `address`, `token` (name, symbol, address, decimals, total_supply — present for ERC-20s), `pool` (pool metadata if applicable), `proof` (block_hash and block_number anchoring the object's existence on-chain), `bytecode_bytes` (size of deployed bytecode), `balance_wei`, and `usdc_atomic`. The `service` field echoes `base_object`.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "properties": {
   "type": "string"
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "ok": true,
  "kind": "erc20",
  "pool": null,
  "proof": {
   "block_hash": "0xabababababababababababababababababababababababababababababababab",
   "block_number": 12345678
  },
  "token": {
   "name": "USD Coin",
   "symbol": "USDC",
   "address": "0x833589fcd6edb6e08f4c7c32d4f71b54bda02913",
   "decimals": 6,
   "total_supply": "1000"
  },
  "address": "0x833589fcd6edb6e08f4c7c32d4f71b54bda02913",
  "service": "base_object",
  "balance_wei": null,
  "usdc_atomic": null,
  "bytecode_bytes": 1200
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/xerxes-base-object-lookup-7c27bc86/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from ari001.tailb4ac3a.ts.net](https://www.zero.xyz/host/ari001.tailb4ac3a.ts.net/llms.txt)