Token Allowance & Balance

Pre-flight check before a swap or transfer: ERC-20 allowance, balance, decimals and symbol in one call, read live from the chain at the latest block. Pass an amount and get a straight would_succeed verdict with the blocking reason and the action needed. Base, Ethereum, Arbitrum, Optimism, Polygon. A missing approval burns the gas of a failed transaction - this call costs a fraction of that.

Resource: api.eucompliance.tools/x402/token

Network: eip155:8453, eip155:42161, eip155:137, solana:5eykt4UsFv8P8NJdTREpY1vzqKqZKvdp · Asset: 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 · Pay to: 0x478bCdeA94b9CB5EA14C33e6f0d7E920743d39f2

Payment methods: — · Last validation: 2026-09-13 23:12:22.65+00

{
  "input": {
    "type": "object",
    "required": [
      "type",
      "method"
    ],
    "properties": {
      "type": {
        "type": "string",
        "const": "http"
      },
      "method": {
        "enum": [
          "GET",
          "HEAD",
          "DELETE"
        ],
        "type": "string"
      },
      "queryParams": {
        "type": "object",
        "required": [
          "token",
          "owner"
        ],
        "properties": {
          "chain": {
            "enum": [
              "base",
              "ethereum",
              "arbitrum",
              "optimism",
              "polygon"
            ],
            "type": "string"
          },
          "owner": {
            "type": "string",
            "description": "wallet holding the tokens"
          },
          "token": {
            "type": "string",
            "description": "ERC-20 contract address"
          },
          "amount": {
            "anyOf": [
              {
                "type": "string"
              },
              {
                "type": "number"
              }
            ],
            "description": "Exact decimal string preferred; JSON number remains accepted for backwards compatibility. Optional; returns a would_succeed verdict."
          },
          "spender": {
            "type": "string",
            "description": "contract that would spend them, optional"
          }
        }
      }
    },
    "additionalProperties": false
  },
  "output": null,
  "paymentRequirements": [
    {
      "raw": {
        "asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
        "extra": {
          "name": "USD Coin",
          "version": "2"
        },
        "payTo": "0x478bCdeA94b9CB5EA14C33e6f0d7E920743d39f2",
        "amount": "2000",
        "scheme": "exact",
        "network": "eip155:8453",
        "maxTimeoutSeconds": 300
      },
      "asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
      "payTo": "0x478bCdeA94b9CB5EA14C33e6f0d7E920743d39f2",
      "scheme": "exact",
      "network": "eip155:8453",
      "amountAtomic": "2000"
    },
    {
      "raw": {
        "asset": "0xaf88d065e77c8cC2239327C5EDb3A432268e5831",
        "extra": {
          "name": "USD Coin",
          "version": "2"
        },
        "payTo": "0x478bCdeA94b9CB5EA14C33e6f0d7E920743d39f2",
        "amount": "2000",
        "scheme": "exact",
        "network": "eip155:42161",
        "maxTimeoutSeconds": 300
      },
      "asset": "0xaf88d065e77c8cC2239327C5EDb3A432268e5831",
      "payTo": "0x478bCdeA94b9CB5EA14C33e6f0d7E920743d39f2",
      "scheme": "exact",
      "network": "eip155:42161",
      "amountAtomic": "2000"
    },
    {
      "raw": {
        "asset": "0x3c499c542cEF5E3811e1192ce70d8cC03d5c3359",
        "extra": {
          "name": "USD Coin",
          "version": "2"
        },
        "payTo": "0x478bCdeA94b9CB5EA14C33e6f0d7E920743d39f2",
        "amount": "2000",
        "scheme": "exact",
        "network": "eip155:137",
        "maxTimeoutSeconds": 300
      },
      "asset": "0x3c499c542cEF5E3811e1192ce70d8cC03d5c3359",
      "payTo": "0x478bCdeA94b9CB5EA14C33e6f0d7E920743d39f2",
      "scheme": "exact",
      "network": "eip155:137",
      "amountAtomic": "2000"
    },
    {
      "raw": {
        "asset": "EPjFWdd5AufqSSqeM2qN1xzybapC8G4wEGGkZwyTDt1v",
        "extra": {
          "feePayer": "D6ZhtNQ5nT9ZnTHUbqXZsTx5MH2rPFiBBggX4hY1WePM"
        },
        "payTo": "9N5TAHbtp9s8Ksrcn4b9Kig4uTRnevZC13bSsMnMAQ4c",
        "amount": "2000",
        "scheme": "exact",
        "network": "solana:5eykt4UsFv8P8NJdTREpY1vzqKqZKvdp",
        "maxTimeoutSeconds": 300
      },
      "asset": "EPjFWdd5AufqSSqeM2qN1xzybapC8G4wEGGkZwyTDt1v",
      "payTo": "9N5TAHbtp9s8Ksrcn4b9Kig4uTRnevZC13bSsMnMAQ4c",
      "scheme": "exact",
      "network": "solana:5eykt4UsFv8P8NJdTREpY1vzqKqZKvdp",
      "amountAtomic": "2000"
    }
  ]
}

Source catalog records are retained separately from live endpoint observations. Sonar score, uptime, and latency are advisory metrics. CDP indexing is not inferred from validation.