# propeller.rocks EVM Calldata Decoder

> propeller.rocks EVM Calldata Decoder is a paid API for AI agents from propeller.rocks, paid per call via x402, $0.001/call, status unknown (last checked 2026-09-14).

Decodes raw EVM transaction calldata into a human-readable function name and named arguments

## Facts

- Endpoint: GET https://propeller.rocks/decode/calldata
- Price: $0.001/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-14
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/propeller-rocks-evm-calldata-decoder-58e095cd
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_XgiYC9t67Xh4tWzjoCBfv

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 propeller-rocks-evm-calldata-decoder-58e095cd
```

Example prompt: Can you decode this EVM transaction calldata for me: 0xa9059cbb000000000000000000000000d8da6bf26964af9d7eed9e03e53415d37aa9604500000000000000000000000000000000000000000000003635c9adc5dea00000 — what function is being called and what are the arguments?

## When to prefer this

Choose this endpoint when you have raw EVM transaction calldata (the input field of a transaction) and need to understand what function was called and with what arguments, especially when you don't have the full ABI locally. Pairs well with the sibling event log decoder for full transaction analysis.

## Known failure modes

- Invalid or malformed calldata hex returns an error
- Unrecognized 4-byte function selector (not in known ABIs) may fail to resolve function name
- Missing 0x prefix or non-hex characters cause parse errors
- Payment not included or invalid results in 402 response
- Very short calldata (less than 4 bytes) cannot be decoded

## How this service works

Decode EVM transaction calldata into function name and named arguments

## Output

Returns the decoded function name and a set of named, typed arguments extracted from the raw calldata hex, making it human-readable without needing the full ABI.

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/propeller-rocks-evm-calldata-decoder-58e095cd/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from propeller.rocks](https://www.zero.xyz/host/propeller.rocks/llms.txt)