# AUN Base Transaction Lookup

> AUN Base Transaction Lookup is a paid API for AI agents from a-upgradenet.com, paid per call via x402, $0.002/call, status unknown (last checked 2026-10-22).

Looks up a Base chain transaction by hash and returns full details including status, gas, value, and ERC-20 token transfers

## Facts

- Endpoint: POST https://a-upgradenet.com/x402/base-tx?utm_source=zero.xyz
- Price: $0.002/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-22
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/aun-base-transaction-lookup-a5c4c020
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_AmcUa6s3D_aEvlcxooIHV

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 aun-base-transaction-lookup-a5c4c020 -d '<json body>'
```

Example prompt: Can you look up Base transaction 0x3a1b2c4d5e6f7a8b9c0d1e2f3a4b5c6d7e8f9a0b1c2d3e4f5a6b7c8d9e0f1a2b and tell me whether it succeeded, how much gas was used, and if any ERC-20 tokens were transferred?

## When to prefer this

Use this endpoint when you need to verify or inspect a specific Base chain transaction by its hash, especially when ERC-20 transfer details (like USDC amounts and recipients) are needed. Prefer this over generic block explorers when you need programmatic access to transaction data within an agent workflow, or when confirming payment receipt on the Base L2 network.

## Known failure modes

- Transaction hash not found on Base — returns found: false
- Invalid hash format (not 66 chars or missing 0x prefix) — likely 400 error or empty result
- Transaction still pending — status may show as pending rather than completed
- Network timeout if Base RPC is congested
- Incorrect chain — hash exists on Ethereum mainnet but not Base

## How this service works

Base Transaction Lookup: status, from/to, value, fee, block and decoded ERC-20 transfers of a Base mainnet transaction. $0.002 per call.

## Output

Returns a JSON object with the transaction's sender and recipient addresses, hash, chain identifier ('base'), found flag, completion status, ETH fee, gas used, transaction success status, ETH value transferred, block number, and an array of ERC-20 token transfer events each containing to/from addresses, raw amount, and token contract address.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "hash": {
   "type": "string",
   "description": "0x transaction hash (66 chars)."
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "to": "0x…",
  "from": "0x…",
  "hash": "0x…",
  "chain": "base",
  "found": true,
  "status": "completed",
  "fee_eth": "0.0000012",
  "gas_used": "65000",
  "tx_status": "success",
  "value_eth": "0",
  "block_number": "21000000",
  "erc20_transfers": [
   {
    "to": "0x…",
    "raw": "100000",
    "from": "0x…",
    "token": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913"
   }
  ]
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/aun-base-transaction-lookup-a5c4c020/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from a-upgradenet.com](https://www.zero.xyz/host/a-upgradenet.com/llms.txt)