# EVM Address Check

> EVM Address Check is a paid API for AI agents from conclavex402.pythonanywhere.com, paid per call via x402, $0.005/call, status unknown (last checked 2026-10-18).

Validates and checksums an Ethereum/EVM address format, returning EIP-55 checksum status and lowercase form.

## Facts

- Endpoint: POST https://conclavex402.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-25b7819c
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_je9i0KfyLlApNiF8RX3mF

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-25b7819c -d '<json body>'
```

Example prompt: Before I send funds, can you validate this Ethereum address and check if it passes EIP-55 checksum: 0x2f2E1F54109B2525137EEda4a892600ee956D42A?

## When to prefer this

Use this endpoint when you need a lightweight, pay-per-call EVM address validator with EIP-55 checksum verification before executing a blockchain transaction or storing a wallet address. Prefer this over client-side validation when you need a trusted, server-side check, or when operating in an agent pipeline without access to an Ethereum library. Especially useful for pre-flight checks before sending funds on Ethereum, Base, or other EVM-compatible chains.

## Known failure modes

- Malformed or missing address input returns an error or false valid_format
- Non-hex strings that don't resemble addresses may return valid_format: false
- Addresses with wrong length (not 20 bytes / 42 chars with 0x) will fail validation
- Payment failure or x402 protocol error prevents the call from executing

## 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 EVM address format), and 'eip55_verifiable' (boolean indicating whether the EIP-55 mixed-case checksum is valid).

## 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-25b7819c/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from conclavex402.pythonanywhere.com](https://www.zero.xyz/host/conclavex402.pythonanywhere.com/llms.txt)