# Delx EVM Transaction Type Classifier

> Delx EVM Transaction Type Classifier is a paid API for AI agents from api.delx.ai, paid per call via x402, $0.001/call, status unknown (last checked 2026-09-15).

Classifies an EVM transaction type integer into its named category (e.g. legacy, access list, dynamic fee)

## Facts

- Endpoint: POST https://api.delx.ai/api/v1/x402/evm-tx-type-classify
- Price: $0.001/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-15
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/delx-evm-transaction-type-classifier-29f7e43e
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_LelGv-ezmyymOr9rBHMkT

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 delx-evm-transaction-type-classifier-29f7e43e -d '<json body>'
```

Example prompt: Can you classify EVM transaction type 2 for me so I know whether it's a legacy, access list, or dynamic fee transaction before I submit it to the network?

## When to prefer this

Choose this endpoint when you need a fast, cheap, stateless classification of an EVM transaction type integer before signing or broadcasting — especially in agent preflight workflows where you need to confirm the fee model (legacy vs EIP-1559 dynamic fee vs access list) without making external blockchain calls. Ideal for agents that process raw transaction objects and need to route or validate by type without writing custom mapping logic.

## Known failure modes

- Invalid or missing transaction_type integer returns a validation error
- Unknown or out-of-range transaction type integers may return an unrecognized classification or error
- Malformed request body causes a 400-level error
- Service unavailability returns a 5xx error

## How this service works

EVM Tx Type Classify: EVM Tx Type Classify classifies legacy, access-list, dynamic-fee, and blob transaction type codes from bounded caller-supplied values without an external provider. Call EVM Tx Type Classify before signing, submitting, replacing, or accepting an EVM/Base transaction assembled from caller-owned data. Returns normalized transaction evidence, calculated budget or shape findings, and a fail-closed preflight status for EVM Tx Type Classify as versioned deterministic JSON. Price:…

## Output

Returns a JSON object containing the named classification (e.g. 'dynamic_fee', 'legacy', 'access_list') corresponding to the input transaction type integer, along with the schema identifier, operation name, pass/fail status, and an evidence block confirming no data retention and no external calls were made.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "transaction_type": {
   "type": "integer",
   "description": "Transaction Type supplied to EVM Tx Type Classify; used only for this bounded calculation and processed in memory without retention."
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "result": {
   "classification": "dynamic_fee",
   "transaction_type": 2
  },
  "schema": "delx/util-evm-tx-type-classify/v1",
  "status": "pass",
  "evidence": {
   "retained": false,
   "input_sha256": "8d7860bf2ad3e866ffa9821fc838a4e0b9a80325d1457ae15d94fe9bf16abe66",
   "external_calls": 0
  },
  "operation": "evm_preflight:evm_tx_type_classify"
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/delx-evm-transaction-type-classifier-29f7e43e/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from api.delx.ai](https://www.zero.xyz/host/api.delx.ai/llms.txt)