FETCH402
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Resource / 505

healthy

Quartermaster Balance Check.

GET https://quartermaster.surewhynot.app/v1/balance ↗

Check ETH and USDC (or any ERC-20) balance of an address on Base — pre-flight funding checks for payments and settlement.

Eligibility
probeable
Failures
0
Last quote
2026-08-13 01:15:01 UTC
Last probe
2026-08-13 01:15:01 UTC
Payment requirements / accepts[] 2 options
State Network Scheme Atomic amount Asset payTo / untrusted
active eip155:8453 exact 1000 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 0x5253666c40432f009ebd99908b9cd2a7fd1019cb
active solana:5eykt4usfv8p8njdtrepy1vzqkqzkvdp exact 1000 EPjFWdd5AufqSSqeM2qN1xzybapC8G4wEGGkZwyTDt1v FgcKNzsBXSEHGNZNWetPsjXiBZk1WFoU6sF2zVsnzXfa

All advertised payment options are stored. Base (`eip155:8453`) is the operational network for ranking and canaries; non-Base options remain visible for transparency.

Probe evidence 1 recent
healthy 2026-08-13 01:15:01 UTC GET · HTTP 402 · 10ms · accepts 2 · base 1 ok
Request
GET https://quartermaster.surewhynot.app/v1/balance
Robots
allow
Note
http_402;accepts=2;base=1
Accepts fingerprint
e310ff31c2f2578ab23ff9559ca3781fa4f071c1469d34cc86f50befe4b9fff3

Accepts snapshot

[
  {
    "amount": "1000",
    "asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
    "assetTransferMethod": null,
    "extra": {
      "name": "USD Coin",
      "version": "2"
    },
    "maxTimeoutSeconds": 300,
    "network": "eip155:8453",
    "payTo": "0x5253666c40432f009ebd99908b9cd2a7fd1019cb",
    "paymentFlow": null,
    "raw": {
      "amount": "1000",
      "asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
      "extra": {
        "name": "USD Coin",
        "version": "2"
      },
      "maxTimeoutSeconds": 300,
      "max_timeout_seconds": 300,
      "network": "eip155:8453",
      "payTo": "0x5253666c40432f009ebd99908b9cd2a7fd1019cb",
      "pay_to": "0x5253666c40432f009ebd99908b9cd2a7fd1019cb",
      "scheme": "exact"
    },
    "scheme": "exact"
  },
  {
    "amount": "1000",
    "asset": "EPjFWdd5AufqSSqeM2qN1xzybapC8G4wEGGkZwyTDt1v",
    "assetTransferMethod": null,
    "extra": {
      "feePayer": "D6ZhtNQ5nT9ZnTHUbqXZsTx5MH2rPFiBBggX4hY1WePM"
    },
    "maxTimeoutSeconds": 300,
    "network": "solana:5eykt4usfv8p8njdtrepy1vzqkqzkvdp",
    "payTo": "FgcKNzsBXSEHGNZNWetPsjXiBZk1WFoU6sF2zVsnzXfa",
    "paymentFlow": null,
    "raw": {
      "amount": "1000",
      "asset": "EPjFWdd5AufqSSqeM2qN1xzybapC8G4wEGGkZwyTDt1v",
      "extra": {
        "feePayer": "D6ZhtNQ5nT9ZnTHUbqXZsTx5MH2rPFiBBggX4hY1WePM"
      },
      "maxTimeoutSeconds": 300,
      "max_timeout_seconds": 300,
      "network": "solana:5eykt4UsFv8P8NJdTREpY1vzqKqZKvdp",
      "payTo": "FgcKNzsBXSEHGNZNWetPsjXiBZk1WFoU6sF2zVsnzXfa",
      "pay_to": "FgcKNzsBXSEHGNZNWetPsjXiBZk1WFoU6sF2zVsnzXfa",
      "scheme": "exact"
    },
    "scheme": "exact"
  }
]

PaymentRequired raw 

{
  "accepts": [
    {
      "amount": "1000",
      "asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
      "extra": {
        "name": "USD Coin",
        "version": "2"
      },
      "maxTimeoutSeconds": 300,
      "network": "eip155:8453",
      "payTo": "0x5253666c40432f009ebd99908b9cd2a7fd1019cb",
      "scheme": "exact"
    },
    {
      "amount": "1000",
      "asset": "EPjFWdd5AufqSSqeM2qN1xzybapC8G4wEGGkZwyTDt1v",
      "extra": {
        "feePayer": "D6ZhtNQ5nT9ZnTHUbqXZsTx5MH2rPFiBBggX4hY1WePM"
      },
      "maxTimeoutSeconds": 300,
      "network": "solana:5eykt4UsFv8P8NJdTREpY1vzqKqZKvdp",
      "payTo": "FgcKNzsBXSEHGNZNWetPsjXiBZk1WFoU6sF2zVsnzXfa",
      "scheme": "exact"
    }
  ],
  "error": "Payment required",
  "extensions": {
    "bazaar": {
      "info": {
        "input": {
          "method": "GET",
          "queryParams": {
            "address": "0xc2a36e22ecbf353086cf83e7beea78bc28a64083",
            "token": "usdc"
          },
          "type": "http"
        },
        "output": {
          "example": {
            "address": "0xc2a3...4083",
            "eth": "0.0031",
            "network": "base",
            "token": {
              "address": "0x8335...2913",
              "balance": "12.5",
              "decimals": 6,
              "symbol": "USDC"
            }
          },
          "type": "json"
        }
      },
      "schema": {
        "$schema": "https://json-schema.org/draft/2020-12/schema",
        "properties": {
          "input": {
            "additionalProperties": false,
            "properties": {
              "method": {
                "enum": [
                  "GET"
                ],
                "type": "string"
              },
              "queryParams": {
                "properties": {
                  "address": {
                    "description": "EVM address to check on Base",
                    "pattern": "^0x[0-9a-fA-F]{40}$",
                    "type": "string"
                  },
                  "token": {
                    "default": "usdc",
                    "description": "'usdc' or an ERC-20 contract address",
                    "type": "string"
                  }
                },
                "required": [
                  "address"
                ],
                "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"
      }
    }
  },
  "resource": {
    "description": "Check ETH and USDC (or any ERC-20) balance of an address on Base — pre-flight funding checks for payments and settlement.",
    "mimeType": "application/json",
    "serviceName": "Quartermaster Balance Check",
    "tags": [
      "balance",
      "wallet",
      "usdc",
      "erc20",
      "settlement",
      "payments",
      "base"
    ],
    "url": "https://quartermaster.surewhynot.app/v1/balance"
  },
  "x402Version": 2
}

Response headers

{
  "access-control-allow-origin": "*",
  "access-control-expose-headers": "PAYMENT-REQUIRED,PAYMENT-RESPONSE,X-PAYMENT-RESPONSE,X-Payment-Notice,Retry-After",
  "alt-svc": "h3=\":443\"; ma=86400",
  "cache-control": "no-store",
  "cf-ray": "a2a3ddc5fe38c9a5-IAD",
  "connection": "keep-alive",
  "content-length": "2",
  "content-type": "application/json",
  "date": "Thu, 13 Aug 2026 01:15:01 GMT",
  "nel": "{\"report_to\":\"cf-nel\",\"success_fraction\":0.0,\"max_age\":604800}",
  "payment-required": "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",
  "permissions-policy": "camera=(), microphone=(), geolocation=()",
  "referrer-policy": "strict-origin-when-cross-origin",
  "report-to": "{\"group\":\"cf-nel\",\"max_age\":604800,\"endpoints\":[{\"url\":\"https://a.nel.cloudflare.com/report/v4?s=1yJtPn738LIZA3JSkmle%2FYB6ZwzVVCi6uf0Xl1VD3tiF%2FS5Rpm0OwlxcyC%2FxfApDC%2BSkQTZ1LPBzluuvkIua64x6kyFAvMaudDAyt9CZiFjfT7A8%2Fw6wlJczrE4wO8%2BwV540Az3aF0Cl84fcaJN%2F\"}]}",
  "server": "cloudflare",
  "speculation-rules": "\"/cdn-cgi/speculation\"",
  "strict-transport-security": "max-age=31536000; includeSubDomains",
  "x-content-type-options": "nosniff"
}

Response body 

{}

Request headers

{
  "accept": "*/*",
  "user-agent": "Fetch402Bot/0.1 (+https://fetch402.com/crawler; contact: crawler@fetch402.com)"
}

Machine contract

Schemas.

InputJSON
{}
OutputJSON
{}