# SignalHarness ERC20 Transfer Decode

> SignalHarness ERC20 Transfer Decode is a paid API for AI agents from signalharness.ai, paid per call via x402, $0.01/call, status unknown (last checked 2026-09-13).

Decodes and interprets an ERC20 token transfer request, returning structured details about the transfer including warnings and evidence scope.

## Facts

- Endpoint: POST https://signalharness.ai/api/agent/services/erc20_transfer_decode/invoke
- Price: $0.01/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-13
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/signalharness-erc20-transfer-decode-f431dc4b
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_GdRSUaPzrna5Y8bGi0ggO

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 signalharness-erc20-transfer-decode-f431dc4b -d '<json body>'
```

Example prompt: Can you decode this ERC20 transfer request for me and tell me what it's doing: '0xa9059cbb000000000000000000000000abcdef1234567890abcdef1234567890abcdef12000000000000000000000000000000000000000000000000002386f26fc10000'?

## When to prefer this

Choose this endpoint when you need a lightweight, pay-per-call API to decode ERC20 transfer calldata or request strings without running a full node or ABI decoder locally. It is particularly useful for AI agents performing safety checks before signing transactions, wallets rendering human-readable transfer previews, or audit pipelines flagging suspicious transfers. At $0.01 USDC per call via x402, it is cost-effective for on-demand single-transfer decoding on the Base network.

## Known failure modes

- Malformed or non-ERC20 transfer input string returns an error or warnings in the decoded result
- Input string too short (below minLength of 2) or too long (above maxLength of 65536) causes validation failure
- Non-transfer ABI selector in input may decode incorrectly or produce warnings
- Payment failure via x402 protocol results in 402 response before execution
- Network issues on Base (eip155:8453) may cause timeouts

## How this service works

Explore 330 pay-per-call x402 API services and 27 agent-native digital products, with Base USDC pricing, secure Polar checkout, and free discovery.

## Output

Returns a JSON object containing the decoded ERC20 transfer details (recipient address, token amount, method), a list of any warnings about the transfer, an evidence scope indicator noting the data is caller-supplied, a status field, and a full receipt with payment and execution metadata including network (Base/eip155:8453), asset contract address, latency, and a result SHA256 hash for verification.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "erc20_transfer_request": {
   "type": "string",
   "maxLength": 65536,
   "minLength": 2
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "replay": false,
  "result": {
   "warnings": [
    "Decoding does not prove token standard compliance or transfer success."
   ],
   "service_id": "erc20_transfer_decode",
   "evidence_scope": "caller_supplied_data",
   "decoded_erc20_transfer": "{\"args\":[\"0x0000000000000000000000000000000000000002\",\"10\"],\"kind\":\"calldata\",\"operation\":\"transfer\"}"
  },
  "status": "succeeded",
  "receipt": {
   "asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
   "usage": [],
   "status": "succeeded",
   "network": "eip155:8453",
   "artifacts": [],
   "endedAtMs": 0,
   "latencyMs": 0,
   "paymentId": "example-payment",
   "receiptId": "example-receipt",
   "requestId": "example-request",
   "serviceId": "erc20_transfer_decode",
   "executionId": "example-execution",
   "startedAtMs": 0,
   "amountAtomic": "10000",
   "resultSha256": "15bea730a9255c4a291fc108c7d928b1821ecf8d893077a511fd2eb7e23acd4e",
   "serviceVersion": "1.0.0",
   "settlementReference": "0x0000000000000000000000000000000000000000000000000000000000000000"
  },
  "artifacts": [],
  "requestId": "example-request",
  "executionId": "example-execution"
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/signalharness-erc20-transfer-decode-f431dc4b/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from signalharness.ai](https://www.zero.xyz/host/signalharness.ai/llms.txt)