# EVM Address Check

> EVM Address Check is a paid API for AI agents from conclavex402p04.pythonanywhere.com, paid per call via x402, $0.005/call, status unknown (last checked 2026-10-18).

Validates and checksums an Ethereum or EVM-compatible address, returning EIP-55 checksum status and lowercase form

## Facts

- Endpoint: POST https://conclavex402p04.pythonanywhere.com/u/address-check?utm_source=zero.xyz
- Price: $0.005/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-18
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/evm-address-check-d598c445
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_R02ZoS-wgovDko2GwZ4uo

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 evm-address-check-d598c445 -d '<json body>'
```

Example prompt: Before I send those funds, can you check if 0x2f2e1f54109b2525137eeda4a892600ee956d42a is a valid EVM address and whether it passes EIP-55 checksum?

## When to prefer this

Use this endpoint when you need a fast, lightweight on-the-fly check of an Ethereum, Base, or any EVM-compatible wallet address before executing a transaction or storing the address. Prefer it over manual regex checks when you also need EIP-55 checksum validation in addition to basic format verification. Particularly valuable in agent pipelines that handle user-supplied wallet addresses where input errors could result in lost funds.

## Known failure modes

- Missing or malformed address input returns a validation error
- Non-hex or non-0x-prefixed strings may return valid_format: false
- Addresses with correct length but invalid hex characters will fail format check
- Network or server errors on pythonanywhere.com may return 5xx responses

## How this service works

EVM address checksum and validation — check an Ethereum/Base address format before sending funds.

## Output

Returns a JSON object with three fields: 'lowercase' (the address normalized to lowercase hex), 'valid_format' (boolean indicating whether the address matches the expected 0x + 40 hex chars format), and 'eip55_verifiable' (boolean indicating whether the address passes EIP-55 mixed-case checksum verification).

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "$schema": "https://json-schema.org/draft/2020-12/schema",
 "required": [
  "input"
 ],
 "properties": {
  "input": {
   "type": "object",
   "required": [
    "type",
    "method",
    "bodyType",
    "body"
   ],
   "properties": {
    "body": {
     "type": "object"
    },
    "type": {
     "type": "string",
     "const": "http"
    },
    "method": {
     "enum": [
      "POST",
      "PUT",
      "PATCH"
     ],
     "type": "string"
    },
    "headers": {
     "type": "object",
     "additionalProperties": {
      "type": "string"
     }
    },
    "bodyType": {
     "enum": [
      "json",
      "form-data",
      "text"
     ],
     "type": "string"
    },
    "pathParams": {
     "type": "object",
     "additionalProperties": {
      "type": "string"
     }
    },
    "queryParams": {
     "type": "object",
     "additionalProperties": {
      "type": "string"
     }
    }
   },
   "additionalProperties": false
  },
  "output": {
   "type": "object",
   "required": [
    "type"
   ],
   "properties": {
    "type": {
     "type": "string"
    },
    "example": {
     "type": "object"
    }
   }
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "lowercase": "0x2f2e1f54109b2525137eeda4a892600ee956d42a",
  "valid_format": true,
  "eip55_verifiable": false
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/evm-address-check-d598c445/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from conclavex402p04.pythonanywhere.com](https://www.zero.xyz/host/conclavex402p04.pythonanywhere.com/llms.txt)