Check the ERC20 allowance an owner has granted a spender, returns raw and format
Check the ERC20 allowance an owner has granted a spender, returns raw and formatted amount with token symbol and decimals on five EVM chains. token allowance, erc20 approval check, spender allowance, approval audit, revoke helper data Accepts payment on Base or Solana — either network works.
Answeringour last check, 2026-09-24
1 of 1checks answered this week
993 msmedian answer time
$0.005listed price per call
$0.005price it asked us
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
GET https://api.x402node.dev/chain/token-allowance
| Category | Code and developer |
|---|---|
| Provider host | api.x402node.dev |
| Networks | eip155:8453, solana:5eykt4UsFv8P8NJdTREpY1vzqKqZKvdp |
| Payment schemes | exact |
| Self-reported calls, 30 days | 2 from 2 payers (the provider's figure, not ours) |
Our checks, last 30 days
| Day | Result | HTTP | Asked | Time |
|---|---|---|---|---|
| 2026-09-24 | valid payment request | 402 | $0.005 | 993 ms |
Example input (from the provider)
{
"method": "GET",
"queryParams": {
"chain": "string",
"owner": "string",
"spender": "string",
"token": "string"
},
"type": "http"
}
Promised output schema (from the provider)
{
"$schema": "https://json-schema.org/draft/2020-12/schema",
"properties": {
"input": {
"additionalProperties": false,
"properties": {
"method": {
"enum": [
"GET"
],
"type": "string"
},
"queryParams": {
"properties": {
"chain": {
"description": "ethereum, base (default), arbitrum, optimism, polygon",
"type": "string"
},
"owner": {
"description": "Owner address (required)",
"type": "string"
},
"spender": {
"description": "Spender address (required)",
"type": "string"
},
"token": {
"description": "ERC20 contract (required)",
"type": "string"
}
},
"required": [
"token",
"owner",
"spender"
],
"type": "object"
},
"type": {
"const": "http",
"type": "string"
}
},
"required": [
"type",
"method"
],
"type": "object"
}
},
"required": [
"input"
],
"type": "object"
}