EVM address checksum and validation tool — normalize one Ethereum-compatible address and v
EVM address checksum and validation tool — normalize one Ethereum-compatible address and validate mixed-case EIP-55 input offline.
5000 (raw units)
price
2
calls / 30d
1
unique payers
2026-09-15
updated
Provider
chain-tools.use.x402atlas.com · discovered, not yet claimed by its owner
Payment (x402 accepts[])
[
{
"scheme": "exact",
"network": "eip155:8453",
"payTo": "0x8C128f1Ee62Bb5e47867CfbAe2ad89be325Df1b2",
"asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
"amount": "5000",
"maxTimeoutSeconds": 300
},
{
"scheme": "exact",
"network": "eip155:137",
"payTo": "0x8C128f1Ee62Bb5e47867CfbAe2ad89be325Df1b2",
"asset": "0x3c499c542cEF5E3811e1192ce70d8cC03d5c3359",
"amount": "5000",
"maxTimeoutSeconds": 300
},
{
"scheme": "exact",
"network": "eip155:42161",
"payTo": "0x8C128f1Ee62Bb5e47867CfbAe2ad89be325Df1b2",
"asset": "0xaf88d065e77c8cC2239327C5EDb3A432268e5831",
"amount": "5000",
"maxTimeoutSeconds": 300
}
]Output schema
{
"bazaar": {
"category": "utilities",
"info": {
"input": {
"body": {
"address": "0x5aAeb6053F3E94C9b9A09f33669435E7Ef1BeAed"
},
"bodyType": "json",
"method": "POST",
"type": "http"
},
"output": {
"example": {
"algorithm_version": "eip55-address-v1",
"checksum": "0x5aAeb6053F3E94C9b9A09f33669435E7Ef1BeAed",
"input_checksum_valid": true,
"lowercase": "0x5aaeb6053f3e94c9b9a09f33669435e7ef1beaed",
"operation": "address-checksum",
"warnings": []
},
"type": "json"
}
},
"schema": {
"$schema": "https://json-schema.org/draft/2020-12/schema",
"properties": {
"input": {
"additionalProperties": false,
"properties": {
"body": {
"additionalProperties": false,
"properties": {
"address": {
"description": "Exact 20-byte EVM address; mixed case must already carry a valid EIP-55 checksum",
"pattern": "^0x[0-9a-fA-F]{40}$",
"type": "string"
}
},
"required": [
"address"
],
"type": "object"
},
"bodyType": {
"enum": [
"json",
"form-data",
"text"
],
"type": "string"
},
"method": {
"enum": [
"POST"
],
"type": "string"
},
"type": {
"const": "http",
"type": "string"
}
},
"required": [
"type",
"method",
"bodyType",
"body"
],
"type": "object"
},
"output": {
"properties": {
"example": {
"additionalProperties": false,
"properties": {
"_atlas": {
"additionalProperties": false,
"description": "Atlas documentation and related-route metadata added after deployment",
"properties": {
"docs": {
"description": "Documentation URL for this bridge",
"format": "uri",
"maxLength": 512,
"type": "string"
},
"related": {
"description": "Bounded related Atlas routes",
"items": {
"additionalProperties": false,
"description": "One related Atlas route",
"properties": {
"bridge": {
"description": "Related bridge name",
"maxLength": 64,
"type": "string"
},
"docs": {
"description": "Related bridge documentation URL",
"format": "uri",
"maxLength": 512,
"type": "string"
},
"summary": {
"description": "Short capability summary",
"maxLength": 256,
"type": "string"
},
"url": {
"description": "Related route URL",
"format": "uri",
"maxLength": 512,
"type": "string"
}
},
"required": [
"bridge",
"url",
"docs",
"summary"
],
"type": "object"
},
"maxItems": 3,
"type": "array"
}
},
"required": [
"docs"
],
"type": "object"
},
"algorithm_version": {
"const": "eip55-address-v1",
"description": "Pinned EIP-55 contract",
"type": "string"
},
"checksum": {
"description": "EIP-55 checksum address",
"type": "string"
},
"input_checksum_valid": {
"description": "True for valid mixed-case input; null when uniform case carried no checksum",
"type": [
"boolean",
"null"
]
},
"lowercase": {
"description": "Uniform lower-case address",
"type": "string"
},
"operation": {
"const": "address-checksum",
"description": "Stable route operation",
"type": "string"
},
"warnings": {
"description": "Always empty",
"items": {
"description": "Warning",
"type": "string"
},
"maxItems": 0,
"type": "array"
}
},
"required": [
"operation",
"algorithm_version",
"lowercase",
"checksum",
"input_checksum_valid",
"warnings"
],
"type": "object"
},
"type": {
"type": "string"
}
},
"required": [
"type"
],
"type": "object"
}
},
"required": [
"input"
],
"type": "object"
},
"tags": [
"eip-55",
"address-checksum",
"evm",
"address-validation",
"blockchain-development"
]
}
}Use it
curl
curl "https://chain-tools.use.x402atlas.com/evm/address-checksum" # -> 402 Payment Required, accepts[] lists how to pay # retry with a PAYMENT-SIGNATURE (or PAYMENT header) once paid
JavaScript
const res = await fetch("https://chain-tools.use.x402atlas.com/evm/address-checksum");
if (res.status === 402) {
const { accepts } = await res.json();
// pay one of accepts[] via an x402 client, then retry with the payment header
}Python
import httpx
res = httpx.get("https://chain-tools.use.x402atlas.com/evm/address-checksum")
if res.status_code == 402:
accepts = res.json()["accepts"]
# pay one of accepts[] via an x402 client, then retry with the payment headerMachine-readable
Everything on this page is also available as clean JSON at /resources/3459.json, and this resource appears in /discovery/resources and /discovery/search.