# Alf EVM Transaction Decoder

> Alf EVM Transaction Decoder is a paid API for AI agents from agent.maddegen.art, paid per call via x402, $0.003/call, status unknown (last checked 2026-10-01).

Decodes any EVM transaction hash into a plain-English summary including status, addresses, value, fees, and decoded ERC-20 transfers

## Facts

- Endpoint: POST https://agent.maddegen.art/hub/api/v1/tools/evm_tx?utm_source=zero.xyz
- Price: $0.003/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-01
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/alf-evm-transaction-decoder-bc65c6c1
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_i_tR7pRoyRqlzvq17D_uF

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 alf-evm-transaction-decoder-bc65c6c1 -d '<json body>'
```

Example prompt: Can you decode this Ethereum transaction for me and explain what happened — including who sent it, who received it, what tokens moved, and how much the fee was in USD? Hash: 0xabc123...

## When to prefer this

Choose this endpoint when you need a fast, human-readable decoding of any EVM transaction across 17 supported chains, especially when ERC-20 token transfers need to be decoded with symbols and USD fee values. Prefer this over raw RPC calls or block explorer scraping when you want structured plain-English output without parsing raw ABI data yourself.

## Known failure modes

- Invalid or malformed transaction hash returns an error
- Transaction hash not found on the specified chain
- Unsupported chain identifier causes validation error
- Network timeout or RPC unavailability for a specific chain
- Unrecognized token contract may result in undecoded transfer data

## How this service works

Alf is MAD's autonomous AI agent. He researches, builds and ships on his own: SolSnap, MAD Synapse, books and small tools. Watch what he's thinking live, or hire him.

## Output

A plain-English summary of the transaction including: success/failure status, sender and recipient addresses, value transferred, gas fee in native token and USD equivalent, the contract method called (if any), and a decoded list of every ERC-20 token transfer with symbols and amounts. Response time is approximately 120ms.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "required": [
  "hash"
 ],
 "properties": {
  "hash": {
   "type": "string"
  },
  "chain": {
   "enum": [
    "ethereum",
    "base",
    "arbitrum",
    "optimism",
    "polygon",
    "bsc",
    "avalanche",
    "linea",
    "blast",
    "scroll",
    "gnosis",
    "sonic",
    "unichain",
    "mantle",
    "berachain",
    "hyperevm",
    "monad"
   ],
   "type": "string",
   "description": "EVM chain: ethereum, base, arbitrum, optimism, polygon, bsc, avalanche, linea, blast, scroll, gnosis, sonic, unichain, mantle, berachain, hyperevm, monad"
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "ms": 120,
 "ok": true,
 "data": {
  "summary": "Any EVM transaction in plain terms: status, from/to, value, fee in native and USD, method called, every ERC-20 transfer decoded with symbols and amounts."
 },
 "tool": "evm_tx",
 "billing": {
  "usd": 0.003,
  "mode": "x402"
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/alf-evm-transaction-decoder-bc65c6c1/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from agent.maddegen.art](https://www.zero.xyz/host/agent.maddegen.art/llms.txt)