# DatapackVibe Ethereum Transaction Explainer

> DatapackVibe Ethereum Transaction Explainer is a paid API for AI agents from api.datapackvibe.com, paid per call via x402, $0.03/call, status unknown (last checked 2026-09-15).

Decodes raw Ethereum transaction calldata or hex-encoded input into a named function, typed ABI parameters, and a plain-English summary of what the transaction does — with explicit caveats about what cannot be inferred from calldata alone.

## Facts

- Endpoint: POST https://api.datapackvibe.com/tx/explain
- Price: $0.03/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-15
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/datapackvibe-ethereum-transaction-explainer-743086df
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_5L-uoFUYNht_QhNYS7PT6

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 datapackvibe-ethereum-transaction-explainer-743086df -d '<json body>'
```

Example prompt: Can you explain what this Ethereum calldata does: 0xa9059cbb000000000000000000000000d8da6bf26964af9d7eed9e03e53415d37aa96045000000000000000000000000000000000000000000000000016345785d8a0000 — break down the function being called, the typed parameters, and tell me what the payload doesn't reveal.

## When to prefer this

Choose this endpoint when you need a pure offline decoding of Ethereum calldata without any blockchain RPC calls — ideal for pre-signing review, debugging, or educational purposes. It does not require a node connection or live chain state, making it fast, deterministic, and safe for sandboxed agent workflows. Prefer it over block-explorer APIs when you want structured typed output plus an explicit 'what we don't know' section rather than just a raw ABI decode.

## Known failure modes

- Unrecognized 4-byte selector not in known ABI databases returns ambiguous or partial decoding
- Malformed or truncated calldata causes a parse error
- Calldata for a non-standard or custom ABI may be incorrectly decoded or return generic parameter names
- No on-chain context is provided so token amounts, contract identities, and state changes remain unknown

## How this service works

Explain any Ethereum transaction or calldata the caller pastes - decodes the 4-byte selector and ABI words into a named function, typed parameters and a plain-English summary, plus an explicit list of what the payload does not tell you. Pure input-in/answer-out: no chain lookup, no invented values.

## Output

Returns the decoded function name resolved from the 4-byte selector, a list of typed ABI parameters with their decoded values, a plain-English narrative explaining what the transaction payload instructs the contract to do, and an explicit list of things that cannot be determined from calldata alone (e.g. contract address, token identity, on-chain state effects).

## 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",
    "bodyType",
    "body"
   ],
   "properties": {
    "body": {
     "properties": {}
    },
    "type": {
     "type": "string",
     "const": "http"
    },
    "method": {
     "enum": [
      "POST"
     ],
     "type": "string"
    },
    "bodyType": {
     "enum": [
      "json",
      "form-data",
      "text"
     ],
     "type": "string"
    }
   },
   "additionalProperties": false
  },
  "output": {
   "type": "object",
   "required": [
    "type"
   ],
   "properties": {
    "type": {
     "type": "string"
    },
    "example": {
     "type": "object"
    }
   }
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/datapackvibe-ethereum-transaction-explainer-743086df/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from api.datapackvibe.com](https://www.zero.xyz/host/api.datapackvibe.com/llms.txt)