# EVM Address Checksum Normalizer (Batch)

> EVM Address Checksum Normalizer (Batch) is a paid API for AI agents from evm-canon-base.onrender.com, paid per call via x402, $0.001/call, status unknown (last checked 2026-09-15).

Normalizes a batch of EVM addresses to EIP-55 mixed-case checksum format, flagging invalid entries without failing the entire batch

## Facts

- Endpoint: POST https://evm-canon-base.onrender.com/checksum
- 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/evm-address-checksum-normalizer-batch-3a177ab4
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_f4m00HkFFx8I6HXgmp6cD

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-checksum-normalizer-batch-3a177ab4 -d '<json body>'
```

Example prompt: Can you normalize these wallet addresses to proper EIP-55 checksum format: 0xde0b295669a9fd93d5f28d9ec85e40f4cb697bae, 0xabcdef1234567890abcdef1234567890abcdef12, and 0xINVALIDADDRESS — flag any that are invalid instead of erroring out?

## When to prefer this

Choose this endpoint when you need to process multiple EVM addresses at once and want fault-tolerant behavior — invalid addresses are flagged rather than causing a full batch failure. It is ideal for data pipelines, user input sanitization, and pre-transaction validation where address lists may contain dirty or malformed entries. Prefer this over single-address normalization tools when handling bulk imports or CSV exports from databases.

## Known failure modes

- Empty input batch returns an error or empty result array
- Malformed request body (missing required field) returns HTTP 400
- Network timeout on the Render.com instance if cold-starting after inactivity
- Individual invalid addresses are flagged rather than causing HTTP errors, but a completely unparseable payload may still fail
- Rate limiting or payment failure via x402 protocol if USDC balance is insufficient

## How this service works

Normalize EVM addresses to EIP-55 checksum form in batches, flagging invalid entries instead of failing the batch

## Output

Returns a batch result for each input address: valid addresses are returned in EIP-55 mixed-case checksum form; invalid addresses are flagged with an error indicator rather than causing the entire batch to fail. The response preserves the original ordering so callers can correlate results back to their input list.

## 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",
     "properties": {
      "address": {
       "type": "string"
      },
      "addresses": {
       "type": "array",
       "items": {
        "type": "string"
       }
      }
     },
     "description": "one 'address' or an 'addresses' batch, max 200"
    },
    "type": {
     "type": "string",
     "const": "http"
    },
    "method": {
     "enum": [
      "POST",
      "PUT",
      "PATCH"
     ],
     "type": "string"
    },
    "bodyType": {
     "enum": [
      "json",
      "form-data",
      "text"
     ],
     "type": "string"
    }
   },
   "additionalProperties": false
  },
  "output": {
   "type": "object",
   "required": [
    "type"
   ],
   "properties": {
    "type": {
     "type": "string"
    },
    "example": {
     "type": "object"
    }
   }
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/evm-address-checksum-normalizer-batch-3a177ab4/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from evm-canon-base.onrender.com](https://www.zero.xyz/host/evm-canon-base.onrender.com/llms.txt)