coinrebate

get_exchange_fees

Read-onlyIdempotent

Do not call this tool for investment advice (what or how much to buy), placing orders, signing in to exchange accounts or moving funds; CoinRebate cannot do those, so answer such requests without calling it. Get the benchmark trading fees from CoinRebate's published fee table for every covered exchange: spot and futures maker/taker fees (VIP 0 base tier) and the same fees after the CoinRebate referral discount. These are published rates, not live order-book data: fees.fee_table_updated is the date an exchange's entry in the table was last updated, while data_source and fetched_at only describe CoinRebate's automated refresh check. Use it only for questions about exchange trading fees and fee discounts.

Input Schema

TableJSON Schema

Name	Required	Description	Default
No arguments

Output Schema

TableJSON Schema

Name	Required	Description	Default
`docs`	Yes
`openapi`	Yes
`version`	Yes
`timestamp`	Yes
`disclaimer`	Yes
`recommended`	Yes
`all_exchanges`	Yes
`compliance_notice`	No

Schema Changelog

Changes observed during successful MCP inspections.

Changed1 schema field changedOct 7, 2026

changedOutput schema / properties / recommended / anyOf

Previous value: -[
-  {
-    "additionalProperties": true,
-    "properties": {
-      "ccxt_id": {
-        "type": "string"
-      },
-      "fee_discount": {
-        "type": "string"
-      },
-      "fees": {
-        "additionalProperties": true,
-        "properties": {
-          "data_source": {
-            "enum": [
-              "live",
-              "partial",
-              "fallback"
-            ],
-            "type": "string"
-          },
-          "fetched_at": {
-            "type": "string"
-          },
-          "futures": {
-            "anyOf": [
-              {
-                "$ref": "#/properties/recommended/anyOf/0/properties/fees/properties/spot/anyOf/0"
-              },
-              {
-                "type": "null"
-              }
-            ]
-          },
-          "savings_example": {
-            "type": "string"
-          },
-          "spot": {
-            "anyOf": [
-              {
-                "additionalProperties": true,
-                "properties": {
-                  "maker": {
-                    "type": "number"
-                  },
-                  "maker_after_rebate": {
-                    "type": "number"
-                  },
-                  "taker": {
-                    "type": "number"
-                  },
-                  "taker_after_rebate": {
-                    "type": "number"
-                  }
-                },
-                "required": [
-                  "maker",
-                  "taker",
-                  "maker_after_rebate",
-                  "taker_after_rebate"
-                ],
-                "type": "object"
-              },
-              {
-                "type": "null"
-              }
-            ]
-          }
-        },
-        "required": [
-          "data_source",
-          "fetched_at"
-        ],
-        "type": "object"
-      },
-      "kyc_required": {
-        "type": "boolean"
-      },
-      "name": {
-        "type": "string"
-      },
-      "reason": {
-        "type": "string"
-      },
-      "referral_code": {
-        "type": "string"
-      },
-      "signup_url": {
-        "type": "string"
-      },
-      "slug": {
-        "type": "string"
-      },
-      "type": {
-        "type": "string"
-      }
-    },
-    "required": [
-      "slug",
-      "name",
-      "type",
-      "ccxt_id",
-      "fee_discount",
-      "referral_code",
-      "signup_url",
-      "kyc_required"
-    ],
-    "type": "object"
-  },
-  {
-    "type": "null"
-  }
-]New value: +[
+  {
+    "additionalProperties": true,
+    "properties": {
+      "ccxt_id": {
+        "type": "string"
+      },
+      "fee_discount": {
+        "type": "string"
+      },
+      "fees": {
+        "additionalProperties": true,
+        "properties": {
+          "data_source": {
+            "enum": [
+              "live",
+              "partial",
+              "fallback"
+            ],
+            "type": "string"
+          },
+          "fee_table_updated": {
+            "type": [
+              "string",
+              "null"
+            ]
+          },
+          "fetched_at": {
+            "type": "string"
+          },
+          "futures": {
+            "anyOf": [
+              {
+                "$ref": "#/properties/recommended/anyOf/0/properties/fees/properties/spot/anyOf/0"
+              },
+              {
+                "type": "null"
+              }
+            ]
+          },
+          "savings_example": {
+            "type": "string"
+          },
+          "spot": {
+            "anyOf": [
+              {
+                "additionalProperties": true,
+                "properties": {
+                  "maker": {
+                    "type": "number"
+                  },
+                  "maker_after_rebate": {
+                    "type": "number"
+                  },
+                  "taker": {
+                    "type": "number"
+                  },
+                  "taker_after_rebate": {
+                    "type": "number"
+                  }
+                },
+                "required": [
+                  "maker",
+                  "taker",
+                  "maker_after_rebate",
+                  "taker_after_rebate"
+                ],
+                "type": "object"
+              },
+              {
+                "type": "null"
+              }
+            ]
+          }
+        },
+        "required": [
+          "data_source",
+          "fetched_at"
+        ],
+        "type": "object"
+      },
+      "kyc_required": {
+        "type": "boolean"
+      },
+      "name": {
+        "type": "string"
+      },
+      "reason": {
+        "type": "string"
+      },
+      "referral_code": {
+        "type": "string"
+      },
+      "signup_url": {
+        "type": "string"
+      },
+      "slug": {
+        "type": "string"
+      },
+      "type": {
+        "type": "string"
+      }
+    },
+    "required": [
+      "slug",
+      "name",
+      "type",
+      "ccxt_id",
+      "fee_discount",
+      "referral_code",
+      "signup_url",
+      "kyc_required"
+    ],
+    "type": "object"
+  },
+  {
+    "type": "null"
+  }
+]

First observedSep 18, 2026

TDQS

A4.5/5.0

Behavior5/5

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

Annotations already declare readOnly/idempotent/openWorld/non-destructive, so the bar is lower, yet the description adds genuinely new behavioral context: these are published static rates, not live order-book data, and it disambiguates freshness fields — fees.fee_table_updated is the exchange entry's last update, whereas data_source and fetched_at describe only CoinRebate's refresh check. That distinction is not derivable from the annotations and prevents a serious misinterpretation of staleness.

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?

Roughly 110 words, which is reasonable for a tool carrying this much scope and freshness nuance, and the key 'published rates, not live data' caveat is stated early. It loses a point because the opening do-not-call sentence and the closing 'Use it only for...' sentence partially restate the same scope boundary, creating mild redundancy.

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?

For a zero-parameter read tool with an output schema present, the description supplies everything an agent needs to select and call it correctly: coverage (all covered exchanges), tier basis (VIP 0), discount treatment, and the non-live nature of the data. Return structure is left to the output schema, which exists, so nothing material is missing.

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?

The tool takes zero parameters and schema coverage is 100%, so there is nothing for the description to document; the baseline for a parameterless tool is 4. The description correctly adds no invented argument syntax and instead spends its words on output semantics.

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

Purpose4/5

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

The description opens with a specific verb+resource+scope: 'Get the benchmark trading fees from CoinRebate's published fee table for every covered exchange,' and pinpoints the content (spot and futures maker/taker at VIP 0 base tier, plus post-referral-discount rates). It distinguishes this reference-data tool from adjacent siblings like compare_fees or recommend_fee_option only implicitly, via the closing 'Use it only for questions about exchange trading fees and fee discounts'; no sibling is named.

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?

It enumerates four explicit out-of-scope request classes (investment advice, placing orders, signing in, moving funds) and instructs the agent to answer those without calling the tool, then states the positive trigger condition. This is unusually strong when/when-not guidance that directly prevents misuse, even though it routes on task type rather than naming alternative tools.

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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