Blackwood State

Token price on Base

blackwood_token_price

Read-onlyIdempotent

Use when you need a crypto token price or market data for a Base token, quoted from on-chain liquidity. Do not use for tokens that only trade off Base or on other DEXs (Aerodrome is not read), price history or OHLC. Returns JSON with the USD price of a token on Base computed on-chain from its deepest Uniswap v3 pool against USDC or WETH, with pool, fee tier and depth for 0.003 USDC per call. Typical response time 1200 ms (p95). Category: Trading.

Input Schema

TableJSON Schema

Name	Required	Description	Default
`token`	Yes	Token on Base: contract address (0x...) or a symbol like WETH, cbBTC, AERO, DEGEN, VIRTUAL
`response_format`	No	concise (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

Name	Required	Description	Default
No arguments

Schema Changelog

Changes observed during successful MCP inspections.

Changed1 schema field changedOct 17, 2026

changedOutput schema / anyOf

Previous value: -[
-  {
-    "additionalProperties": false,
-    "properties": {
-      "blockNumber": {
-        "maximum": 9007199254740991,
-        "minimum": -9007199254740991,
-        "type": "integer"
-      },
-      "decimals": {
-        "maximum": 9007199254740991,
-        "minimum": -9007199254740991,
-        "type": "integer"
-      },
-      "depthUsd": {
-        "type": [
-          "number",
-          "null"
-        ]
-      },
-      "feeTier": {
-        "anyOf": [
-          {
-            "maximum": 9007199254740991,
-            "minimum": -9007199254740991,
-            "type": "integer"
-          },
-          {
-            "type": "null"
-          }
-        ]
-      },
-      "pool": {
-        "type": [
-          "string",
-          "null"
-        ]
-      },
-      "priceUsd": {
-        "type": "number"
-      },
-      "quote": {
-        "enum": [
-          "USDC",
-          "WETH"
-        ],
-        "type": "string"
-      },
-      "source": {
-        "type": "string"
-      },
-      "symbol": {
-        "type": [
-          "string",
-          "null"
-        ]
-      },
-      "token": {
-        "type": "string"
-      }
-    },
-    "required": [
-      "token",
-      "symbol",
-      "decimals",
-      "priceUsd",
-      "quote",
-      "pool",
-      "feeTier",
-      "depthUsd",
-      "blockNumber",
-      "source"
-    ],
-    "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": {
+      "blockNumber": {
+        "maximum": 9007199254740991,
+        "minimum": -9007199254740991,
+        "type": "integer"
+      },
+      "decimals": {
+        "maximum": 9007199254740991,
+        "minimum": -9007199254740991,
+        "type": "integer"
+      },
+      "depthUsd": {
+        "type": [
+          "number",
+          "null"
+        ]
+      },
+      "feeTier": {
+        "anyOf": [
+          {
+            "maximum": 9007199254740991,
+            "minimum": -9007199254740991,
+            "type": "integer"
+          },
+          {
+            "type": "null"
+          }
+        ]
+      },
+      "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"
+      },
+      "pool": {
+        "type": [
+          "string",
+          "null"
+        ]
+      },
+      "priceUsd": {
+        "type": "number"
+      },
+      "quote": {
+        "enum": [
+          "USDC",
+          "WETH"
+        ],
+        "type": "string"
+      },
+      "source": {
+        "type": "string"
+      },
+      "symbol": {
+        "type": [
+          "string",
+          "null"
+        ]
+      },
+      "token": {
+        "type": "string"
+      }
+    },
+    "required": [
+      "token",
+      "symbol",
+      "decimals",
+      "priceUsd",
+      "quote",
+      "pool",
+      "feeTier",
+      "depthUsd",
+      "blockNumber",
+      "source"
+    ],
+    "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"
+  }
+]

AddedOct 17, 2026

TDQS

A4.7/5.0

Behavior5/5

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

Annotations cover safety (readOnly, idempotent, non-destructive), so the description adds the operational context that matters: cost of 0.003 USDC per call, p95 latency of 1200 ms, and the on-chain methodology (deepest Uniswap v3 pool against USDC or WETH, plus pool/fee-tier/depth in the response).

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

Conciseness5/5

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

Front-loads the use condition, then exclusions, then response, cost, and latency. Every sentence carries distinct information an agent needs; no filler.

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?

Given an output schema exists, the description needn't explain return shape, yet it usefully previews the fields. Exclusions, cost, latency, and data source are all present, leaving no gap an agent needs before calling.

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

Parameters3/5

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

Schema description coverage is 100%, so both the token identifier format and response_format enum are already documented. The description adds data-source context but no syntax or format detail beyond the schema, so the baseline of 3 applies.

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+resource ('crypto token price or market data for a Base token'), scopes it to on-chain liquidity, and explicitly distinguishes itself from siblings like blackwood_fx_rates and blackwood_wallet_balances by naming Base-only coverage.

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?

Gives explicit when-to-use (Base token price/market data) and when-not-to-use (tokens that trade only off-Base, other DEXs, Aerodrome not read, price history or OHLC). Nothing about selection 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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