# Delx EVM Access List Shape Check

> Delx EVM Access List Shape Check 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).

Validates the structural shape of an EVM transaction access list (EIP-2930), confirming addresses and storage keys conform to the expected format.

## Facts

- Endpoint: POST https://api.delx.ai/api/v1/x402/evm-access-list-shape-check
- 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-access-list-shape-check-c4be7b79
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_NbccyrYAi4jwOD1zW1aM-

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-access-list-shape-check-c4be7b79 -d '<json body>'
```

Example prompt: Before I submit this Ethereum transaction, can you check whether my access list is correctly shaped — here it is: [{"address":"0x1111111111111111111111111111111111111111","storageKeys":["0xaaaa..."]}]?

## When to prefer this

Choose this endpoint when you need a fast, stateless, privacy-preserving structural check on an EVM EIP-2930 access list before submitting a transaction. It is ideal for agent-driven transaction pipelines that need a cheap ($0.001 USDC) preflight gate to catch malformed access lists early, avoiding expensive on-chain reverts. Prefer it over full transaction simulation when you only need structural/shape validation, not execution outcome prediction.

## Known failure modes

- Malformed access list entries (e.g. missing address or storageKeys fields) result in shape_valid: false
- Access list exceeds 256 items causing a 400-level rejection
- Individual objects with more than 128 properties are rejected
- Invalid JSON structure in the access_list array causes a parse error
- Non-hex or wrong-length address strings may fail shape validation

## How this service works

EVM Access List Shape Check: EVM Access List Shape Check checks bounded EIP-2930 access-list address and storage-key shapes from bounded caller-supplied values without an external provider. Call EVM Access List Shape Check 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 Access List Shape Check as versioned determin…

## Output

Returns a JSON object indicating whether the access list is structurally valid (shape_valid: true/false), the normalized access list, a status string ('pass' or 'fail'), and an evidence block confirming no data is retained, zero external calls were made, and an input SHA-256 hash for auditability.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "access_list": {
   "type": "array",
   "items": {
    "type": "object",
    "maxProperties": 128,
    "additionalProperties": true
   },
   "maxItems": 256,
   "description": "Access List supplied to EVM Access List Shape Check; used only for this bounded calculation and processed in memory without retention."
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "result": {
   "access_list": [
    {
     "address": "0x1111111111111111111111111111111111111111",
     "storageKeys": [
      "0xaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa"
     ]
    }
   ],
   "shape_valid": true
  },
  "schema": "delx/util-evm-access-list-shape-check/v1",
  "status": "pass",
  "evidence": {
   "retained": false,
   "input_sha256": "c95fc9bc68ce73ff8a8fe469781d27e5342ca1ef3899ec2614304bc60ab0eff2",
   "external_calls": 0
  },
  "operation": "evm_preflight:evm_access_list_shape_check"
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/delx-evm-access-list-shape-check-c4be7b79/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)