Check whether an address already matches its EIP-55 checksum form — call when ve
Check whether an address already matches its EIP-55 checksum form — call when verifying an address already matches EIP-55 form. Use for chain input hygiene without live RPC—adjacent to OneSource-class small chain reads, but static/local only so rights and margin stay clear. Returns deterministic machine-readable JSON for $0.003 USDC via x402 on Base. Execution is first-party, local-only, stateless, and memory-only with no paid upstream, no input retention, and no claim of live chain tip, web se…
Paid test badge: not yet. The checks above are free: we call the tool without paying and read the payment request it sends back. The Verified badge needs paid calls whose answers match the promised output, and nobody can buy a badge.
Endpoint
POST https://api.delx.ai/api/v1/x402/eip55-check
| Category | Code and developer |
|---|---|
| Provider host | api.delx.ai |
| Networks | eip155:8453, solana:5eykt4UsFv8P8NJdTREpY1vzqKqZKvdp |
| Payment schemes | exact |
| Self-reported calls, 30 days | 3 from 3 payers (the provider's figure, not ours) |
Our checks, last 30 days
| Day | Result | HTTP | Asked | Time |
|---|---|---|---|---|
| 2026-10-10 | valid payment request | 402 | $0.003 | 1258 ms |
Example input (from the provider)
{
"body": {
"address": "0x95222290DD7278Aa3Ddd389Cc1E1d165CC4BAfe5"
},
"bodyType": "json",
"method": "POST",
"type": "http"
}
Promised output schema (from the provider)
{
"$schema": "https://json-schema.org/draft/2020-12/schema",
"properties": {
"input": {
"additionalProperties": false,
"properties": {
"body": {
"additionalProperties": true,
"properties": {
"address": {
"description": "EVM address (40 hex chars, optional 0x).",
"type": "string"
}
},
"required": [
"address"
],
"type": "object"
},
"bodyType": {
"const": "json",
"type": "string"
},
"method": {
"const": "POST",
"type": "string"
},
"type": {
"const": "http",
"type": "string"
}
},
"required": [
"type",
"bodyType",
"body"
],
"type": "object"
},
"output": {
"properties": {
"example": {
"additionalProperties": true,
"description": "Bounded first-party JSON result; input is processed in memory and not retained.",
"properties": {
"algorithm": {
"type": "string"
},
"expected": {
"type": "string"
},
"is_checksummed": {
"type": "boolean"
},
"schema": {
"type": "string"
},
"valid": {
"type": "boolean"
}
},
"type": "object"
},
"type": {
"const": "json",
"type": "string"
}
},
"required": [
"type",
"example"
],
"type": "object"
}
},
"required": [
"input",
"output"
],
"type": "object"
}