Api Endpoint

base-allowance

ERC20 allowance on Base mainnet via RPC: how much a spender is approved to move from an owner balance, read with allowance(owner,spender) eth_call.

Open interactive test console

Offering

Provider: x402.agentindex.world
Method: POST
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://x402.agentindex.world/base/allowance
MIME type: application/json
First seen: 2026-10-16T01:50:38.788Z
Last seen: 2026-11-01T15:10:57.122Z
Tags: allowance base, erc20 approval, base rpc, spending limit, Base mainnet

Website

Payment pricing

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

Payment option 1: 0.003 USDC
Atomic price: 3000 · Network: eip155:8453 · Asset: USDC · Scheme: exact

Raw x402 terms

[
  {
    "scheme": "exact",
    "network": "eip155:8453",
    "asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
    "amount": "3000",
    "payTo": "0xb3F32bdfe8D07825BC0D7387295aB1D7559BA69d"
  }
]

Observed health

Status: Reachable
Latest latency: 1248 ms
Average latency: 1022 ms
HTTP status: 405
Last checked: 2026-11-02T09:13:00.908Z
Reachability: 100% over 12 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": [
        "POST",
        "PUT",
        "PATCH"
      ]
    },
    "bodyType": {
      "type": "string",
      "enum": [
        "json",
        "form-data",
        "text"
      ]
    },
    "body": {
      "properties": {
        "token": {
          "title": "Token",
          "type": "string"
        },
        "owner": {
          "title": "Owner",
          "type": "string"
        },
        "spender": {
          "title": "Spender",
          "type": "string"
        }
      },
      "required": [
        "token",
        "owner",
        "spender"
      ],
      "title": "AllowanceInput",
      "type": "object"
    }
  },
  "required": [
    "type",
    "method",
    "bodyType",
    "body"
  ],
  "additionalProperties": false
}

Output schema

{
  "type": "object",
  "properties": {
    "type": {
      "type": "string"
    },
    "example": {
      "type": "object",
      "properties": {
        "token": {
          "title": "Token",
          "type": "string"
        },
        "owner": {
          "title": "Owner",
          "type": "string"
        },
        "spender": {
          "title": "Spender",
          "type": "string"
        },
        "decimals": {
          "title": "Decimals",
          "type": "integer"
        },
        "allowance_raw": {
          "title": "Allowance Raw",
          "type": "string"
        },
        "allowance": {
          "title": "Allowance",
          "type": "number"
        }
      },
      "required": [
        "token",
        "owner",
        "spender",
        "decimals",
        "allowance_raw",
        "allowance"
      ],
      "title": "AllowanceOutput"
    }
  },
  "required": [
    "type"
  ]
}