Api Endpoint

ERC20 allowance

Use when an agent is about to approve a spender, or is auditing what it approved before: how much of a token the spender may still move on the owner's behalf, raw and formatted with its decimals, plus unlimited, which flags a forgotten infinite approval. Do not use for what the wallet actually holds (/v1/evm/erc20-balance) or for whether the token is safe (/v1/evm/token-safety). No API key.

Open interactive test console

Offering

Provider: flat-rate-llm.kikoribera03.workers.dev
Method: GET
Offering type: Api Endpoint
Transport type: http
Category: Blockchain And Crypto
Delivery: Not provided
Pricing model: Not provided
x402 version: 2

Endpoint context

URL: https://flat-rate-llm.kikoribera03.workers.dev/v1/evm/erc20-allowance
MIME type: Not provided
First seen: 2026-10-16T01:51:02.144Z
Last seen: 2026-11-02T07:25:34.331Z
Tags: erc20 allowance, allowance, approve, spender, USDC, ERC20, Security, Base, Ethereum, Polygon, Arbitrum, optimism

Website

Payment pricing

x402 payment terms are the authoritative price for calling this endpoint.

Payment option 1: 0.005 USDC
Atomic price: 5000 · Network: eip155:8453 · Asset: USDC · Scheme: exact
Payment option 2: 0.005 USDC
Atomic price: 5000 · Network: eip155:137 · Asset: USDC · Scheme: exact
Payment option 3: 0.005 USDC
Atomic price: 5000 · Network: eip155:42161 · Asset: USDC · Scheme: exact

Raw x402 terms

[
  {
    "scheme": "exact",
    "network": "eip155:8453",
    "asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
    "amount": "5000",
    "payTo": "0xc210Ea7D5692a6401ADf25BbCB7aCDe9cDB7e9Ff"
  },
  {
    "scheme": "exact",
    "network": "eip155:137",
    "asset": "0x3c499c542cEF5E3811e1192ce70d8cC03d5c3359",
    "amount": "5000",
    "payTo": "0xc210Ea7D5692a6401ADf25BbCB7aCDe9cDB7e9Ff"
  },
  {
    "scheme": "exact",
    "network": "eip155:42161",
    "asset": "0xaf88d065e77c8cC2239327C5EDb3A432268e5831",
    "amount": "5000",
    "payTo": "0xc210Ea7D5692a6401ADf25BbCB7aCDe9cDB7e9Ff"
  }
]

Observed health

Status: Healthy
Latest latency: 41 ms
Average latency: 893 ms
HTTP status: 402
Last checked: 2026-11-02T07:25:34.325Z
Reachability: 100% over 14 checks

Latency is measured to the first response headers. A reachable result does not verify response accuracy or merchant identity.

Input schema

{
  "type": "object",
  "properties": {
    "type": {
      "type": "string",
      "const": "http"
    },
    "method": {
      "type": "string",
      "enum": [
        "GET"
      ]
    },
    "queryParams": {
      "type": "object",
      "properties": {
        "owner": {
          "type": "string",
          "description": "Address that owns the tokens."
        },
        "spender": {
          "type": "string",
          "description": "Address allowed to spend them."
        },
        "token": {
          "type": "string",
          "description": "ERC20 contract address."
        },
        "chain": {
          "type": "string",
          "description": "base | ethereum | polygon | arbitrum | optimism."
        }
      },
      "required": [
        "owner",
        "spender",
        "token"
      ]
    }
  },
  "required": [
    "type",
    "method"
  ],
  "additionalProperties": false
}

Output schema

{
  "$schema": "https://json-schema.org/draft/2020-12/schema",
  "properties": {
    "input": {
      "additionalProperties": false,
      "properties": {
        "method": {
          "enum": [
            "GET"
          ],
          "type": "string"
        },
        "queryParams": {
          "properties": {
            "chain": {
              "description": "base | ethereum | polygon | arbitrum | optimism.",
              "type": "string"
            },
            "owner": {
              "description": "Address that owns the tokens.",
              "type": "string"
            },
            "spender": {
              "description": "Address allowed to spend them.",
              "type": "string"
            },
            "token": {
              "description": "ERC20 contract address.",
              "type": "string"
            }
          },
          "required": [
            "owner",
            "spender",
            "token"
          ],
          "type": "object"
        },
        "type": {
          "const": "http",
          "type": "string"
        }
      },
      "required": [
        "type",
        "method"
      ],
      "type": "object"
    },
    "output": {
      "properties": {
        "example": {
          "type": "object"
        },
        "type": {
          "type": "string"
        }
      },
      "required": [
        "type"
      ],
      "type": "object"
    }
  },
  "required": [
    "input"
  ],
  "type": "object"
}