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by io.github.Blackwood-State
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Wallet balances on Base

blackwood_wallet_balances
Read-onlyIdempotent

Use when you need the ERC20 token balance or wallet balance of an address on Base for onchain data checks. Do not use for ethereum mainnet or other chains, NFTs, transaction history or USD values. Returns JSON with the ETH and ERC20 token balances of a wallet on Base, read on-chain in one block: 21 major tokens plus any you list for 0.004 USDC per call. Typical response time 1200 ms (p95). Category: Data.

Input Schema

TableJSON Schema
NameRequiredDescriptionDefault
tokensNoExtra ERC20 token addresses on Base to check, e.g. ["0x4200000000000000000000000000000000000006"] (up to 20, beyond the 21 major ones)
addressYesWallet address on Base, e.g. 0x5A6c77758820182484EA8DE614FC65423E80749a
includeZeroNoAlso list tokens with zero balance (false when omitted)
response_formatNoconcise (the default when omitted) keeps the JSON short: long fields such as base64 images or audio come back as separate image/audio content blocks and other long strings are cut with a marker; detailed returns the full JSON

Output Schema

TableJSON Schema
NameRequiredDescriptionDefault

No arguments

Schema Changelog

Changes observed during successful MCP inspections.

  1. Changed1 schema field changed
    • changedOutput schema / anyOf
      Previous value: -[
-  {
-    "additionalProperties": false,
-    "properties": {
-      "address": {
-        "type": "string"
-      },
-      "blockNumber": {
-        "maximum": 9007199254740991,
-        "minimum": -9007199254740991,
-        "type": "integer"
-      },
-      "checkedTokens": {
-        "maximum": 9007199254740991,
-        "minimum": -9007199254740991,
-        "type": "integer"
-      },
-      "native": {
-        "additionalProperties": false,
-        "properties": {
-          "balance": {
-            "type": "string"
-          },
-          "raw": {
-            "type": "string"
-          },
-          "symbol": {
-            "const": "ETH",
-            "type": "string"
-          }
-        },
-        "required": [
-          "symbol",
-          "balance",
-          "raw"
-        ],
-        "type": "object"
-      },
-      "network": {
-        "const": "eip155:8453",
-        "type": "string"
-      },
-      "notTokens": {
-        "items": {
-          "type": "string"
-        },
-        "type": "array"
-      },
-      "tokens": {
-        "items": {
-          "additionalProperties": false,
-          "properties": {
-            "balance": {
-              "type": "string"
-            },
-            "decimals": {
-              "maximum": 9007199254740991,
-              "minimum": -9007199254740991,
-              "type": "integer"
-            },
-            "raw": {
-              "type": "string"
-            },
-            "symbol": {
-              "type": [
-                "string",
-                "null"
-              ]
-            },
-            "token": {
-              "type": "string"
-            }
-          },
-          "required": [
-            "token",
-            "symbol",
-            "decimals",
-            "balance",
-            "raw"
-          ],
-          "type": "object"
-        },
-        "type": "array"
-      }
-    },
-    "required": [
-      "address",
-      "network",
-      "blockNumber",
-      "native",
-      "tokens",
-      "notTokens",
-      "checkedTokens"
-    ],
-    "type": "object"
-  },
-  {
-    "description": "x402 PaymentRequired (returned with isError when payment is needed)",
-    "properties": {
-      "accepts": {
-        "items": {
-          "type": "object"
-        },
-        "type": "array"
-      },
-      "error": {
-        "type": "string"
-      },
-      "extensions": {
-        "type": "object"
-      },
-      "resource": {
-        "type": "object"
-      },
-      "x402Version": {
-        "type": "integer"
-      }
-    },
-    "required": [
-      "x402Version",
-      "accepts"
-    ],
-    "type": "object"
-  }
-]New value: +[
+  {
+    "additionalProperties": false,
+    "properties": {
+      "address": {
+        "type": "string"
+      },
+      "blockNumber": {
+        "maximum": 9007199254740991,
+        "minimum": -9007199254740991,
+        "type": "integer"
+      },
+      "checkedTokens": {
+        "maximum": 9007199254740991,
+        "minimum": -9007199254740991,
+        "type": "integer"
+      },
+      "native": {
+        "additionalProperties": false,
+        "properties": {
+          "balance": {
+            "type": "string"
+          },
+          "raw": {
+            "type": "string"
+          },
+          "symbol": {
+            "const": "ETH",
+            "type": "string"
+          }
+        },
+        "required": [
+          "symbol",
+          "balance",
+          "raw"
+        ],
+        "type": "object"
+      },
+      "network": {
+        "const": "eip155:8453",
+        "type": "string"
+      },
+      "next": {
+        "additionalProperties": false,
+        "description": "Suggested next paid call in the same family (call it in a loop when the task continues)",
+        "properties": {
+          "method": {
+            "enum": [
+              "GET",
+              "POST"
+            ],
+            "type": "string"
+          },
+          "sample": {
+            "description": "Free fixed sample of the whole family",
+            "type": "string"
+          },
+          "service": {
+            "description": "Service id of the suggested next paid call",
+            "type": "string"
+          },
+          "tool": {
+            "description": "MCP tool name of the same call",
+            "type": "string"
+          },
+          "url": {
+            "description": "Paid route of the next call",
+            "type": "string"
+          },
+          "useWhen": {
+            "description": "When the next call is the right one",
+            "type": "string"
+          }
+        },
+        "required": [
+          "service",
+          "tool",
+          "method",
+          "url",
+          "useWhen",
+          "sample"
+        ],
+        "type": "object"
+      },
+      "notTokens": {
+        "items": {
+          "type": "string"
+        },
+        "type": "array"
+      },
+      "tokens": {
+        "items": {
+          "additionalProperties": false,
+          "properties": {
+            "balance": {
+              "type": "string"
+            },
+            "decimals": {
+              "maximum": 9007199254740991,
+              "minimum": -9007199254740991,
+              "type": "integer"
+            },
+            "raw": {
+              "type": "string"
+            },
+            "symbol": {
+              "type": [
+                "string",
+                "null"
+              ]
+            },
+            "token": {
+              "type": "string"
+            }
+          },
+          "required": [
+            "token",
+            "symbol",
+            "decimals",
+            "balance",
+            "raw"
+          ],
+          "type": "object"
+        },
+        "type": "array"
+      }
+    },
+    "required": [
+      "address",
+      "network",
+      "blockNumber",
+      "native",
+      "tokens",
+      "notTokens",
+      "checkedTokens"
+    ],
+    "type": "object"
+  },
+  {
+    "description": "x402 PaymentRequired (returned with isError when payment is needed)",
+    "properties": {
+      "accepts": {
+        "items": {
+          "type": "object"
+        },
+        "type": "array"
+      },
+      "error": {
+        "type": "string"
+      },
+      "extensions": {
+        "type": "object"
+      },
+      "resource": {
+        "type": "object"
+      },
+      "x402Version": {
+        "type": "integer"
+      }
+    },
+    "required": [
+      "x402Version",
+      "accepts"
+    ],
+    "type": "object"
+  }
+]
  2. Added

TDQS

A4.6/5.0
Behavior4/5

Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?

Annotations already declare readOnlyHint=true, idempotentHint=true and destructiveHint=false, so safety is covered. The description adds real behavioral context the annotations do not: per-call cost (0.004 USDC), p95 latency (1200 ms), single-block read semantics, and the 21-major-token baseline. It stops short of describing pagination or output error behavior, so not quite top marks.

Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.

Conciseness4/5

Is the description appropriately sized, front-loaded, and free of redundancy?

Front-loaded with the use-when clause and exclusions before the return/cost details, and every sentence carries information. Slightly dense as a single run-on block, but no wasted sentences.

Shorter descriptions cost fewer tokens and are easier for agents to parse. Every sentence should earn its place.

Completeness5/5

Given the tool's complexity, does the description cover enough for an agent to succeed on first attempt?

Covers purpose, exclusions, cost, latency, and result shape; an output schema exists so it need not explain return structure, yet it still orients the agent with the ETH-plus-ERC20 JSON shape. Everything needed to call the tool correctly is present.

Complex tools with many parameters or behaviors need more documentation. Simple tools need less. This dimension scales expectations accordingly.

Parameters4/5

Does the description clarify parameter syntax, constraints, interactions, or defaults beyond what the schema provides?

Schema coverage is 100%, so the baseline is 3, but the description adds meaningful context for the `tokens` parameter by explaining the 21-major-token baseline plus any listed tokens and the per-call cost. It does not add semantics for includeZero or response_format beyond the schema, keeping it at a 4 rather than 5.

Input schemas describe structure but not intent. Descriptions should explain non-obvious parameter relationships and valid value ranges.

Purpose5/5

Does the description clearly state what the tool does and how it differs from similar tools?

States a specific verb and resource (retrieve ETH and ERC20 token balances of an address) and pins the scope to Base, which cleanly separates it from the many unrelated siblings. An agent can identify the purpose without opening the schema.

Agents choose between tools based on descriptions. A clear purpose with a specific verb and resource helps agents select the right tool.

Usage Guidelines5/5

Does the description explain when to use this tool, when not to, or what alternatives exist?

"Use when you need..." plus an explicit exclusions list (Ethereum mainnet/other chains, NFTs, transaction history, USD values) tells the agent both when to select this and when a different tool like blackwood_token_price is the right call. Nothing is left to inference.

Agents often have multiple tools that could apply. Explicit usage guidance like "use X instead of Y when Z" prevents misuse.

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