# Base Transaction Type Inspector

> Base Transaction Type Inspector is a paid API for AI agents from signalharness.ai, paid per call via x402, $0.01/call, status unknown (last checked 2026-09-15).

Classifies and analyzes a raw Base/Ethereum transaction JSON to determine its EIP type, expected fields, and OP Stack network context

## Facts

- Endpoint: POST https://signalharness.ai/api/agent/services/base_transaction_type_inspect/invoke
- Price: $0.01/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-15
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/base-transaction-type-inspector-a5a3d17c
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_uKOwT8yeAHQE0Plro1Z2x

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 base-transaction-type-inspector-a5a3d17c -d '<json body>'
```

Example prompt: Can you inspect this Base transaction JSON and tell me what type it is, which EIP standard it follows, and whether any required fields like max_fee_per_gas or max_priority_fee_per_gas are missing?

## When to prefer this

Use this endpoint when you need to programmatically classify a raw Base or Ethereum transaction JSON by its EIP type, verify field completeness, or understand OP Stack-specific metadata like deposit transaction types and L2 fee models. Prefer this over generic Ethereum tools when working specifically on Base mainnet or Base Sepolia (chain IDs 8453/84532) and needing OP Stack context.

## Known failure modes

- Malformed JSON string in request_json causes parse failure
- Transaction type is unknown or undocumented, triggering a warning about future types
- Missing fields in transaction JSON reduce classification confidence
- Unsupported transaction format returns incomplete analysis

## 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 structured analysis including the transaction's EIP classification (e.g. 0x2 for EIP-1559 or 0x7e for OP Stack deposit), whether it is Base-specific, expected and missing fields, and full network context including accepted chain IDs, fee model description, and OP Stack protocol family. Also returns evidence scope and analyzed network identifier.

## Request schema (JSON Schema)

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

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "replay": false,
  "result": {
   "warnings": [
    "Future types remain unknown unless their fields are supplied and documented."
   ],
   "service_id": "base_transaction_type_inspect",
   "analysis_json": "{\"base_specific\":false,\"classification\":\"eip1559\",\"expected_fields\":[\"max_fee_per_gas\",\"max_priority_fee_per_gas\"],\"missing_fields\":[],\"network_context\":{\"accepted_chain_ids\":[\"8453\",\"84532\"],\"deposit_transaction_type\":\"0x7e\",\"fee_model\":\"L2 execution plus caller-supplied L1 data/operator components\",\"protocol_family\":\"OP Stack\"},\"type\":\"0x2\"}",
   "evidence_scope": "caller_supplied_data",
   "analyzed_network": "base"
  },
  "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": "base_transaction_type_inspect",
   "executionId": "example-execution",
   "startedAtMs": 0,
   "amountAtomic": "10000",
   "resultSha256": "37c080ae468066e41627e06d1b419cd21ed3b9453494911190c9679af30f1b3e",
   "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/base-transaction-type-inspector-a5a3d17c/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)