BlockVectra: multi-chain RPC & Data API

List Supported Chains

list_chains

Read-only

Fetch supported blockchain networks and static parameters from GET /v1/chains. methods.allow and methods.deny support wildcard patterns where deny takes precedence over allow. state_window_blocks indicates the historical state window in blocks for state queries (null when full history is available); max_logs_block_range limits eth_getLogs: the range is inclusive, so toBlock - fromBlock + 1 must not exceed it, otherwise the call fails with logs_range_too_large. public describes the keyless endpoint: public.url serves only the methods in public.methods, and public.history_blocks is how far back a block reference may reach on that endpoint (it does not add methods). Pass chain (a slug such as base_mainnet) to return only that chain.

Input Schema

TableJSON Schema

Name	Required	Description	Default
`chain`	No	Optional chain slug (exact match, e.g. 'base_mainnet'). When set, only that chain is returned; unknown slugs return an error listing the available ones. Omit to list all chains.

Output Schema

TableJSON Schema

Name	Required	Description	Default
No arguments

Schema Changelog

Changes observed during successful MCP inspections.

Changed3 schema fields changedOct 18, 2026

addedOutput schema / anyOf

Added value: +[
+  {
+    "allOf": [
+      {
+        "properties": {
+          "chains": {
+            "items": {
+              "properties": {
+                "chain": {
+                  "type": "string"
+                },
+                "chain_id": {
+                  "type": "number"
+                },
+                "data": {
+                  "type": "boolean"
+                },
+                "jsonrpc": {
+                  "type": "boolean"
+                },
+                "max_logs_block_range": {
+                  "description": "Max block span of one eth_getLogs request. Both ends are inclusive: toBlock - fromBlock + 1 must not exceed this value, otherwise the call returns logs_range_too_large.",
+                  "type": [
+                    "number",
+                    "null"
+                  ]
+                },
+                "methods": {
+                  "type": [
+                    "object",
+                    "null"
+                  ]
+                },
+                "name": {
+                  "type": "string"
+                },
+                "public": {
+                  "properties": {
+                    "history_blocks": {
+                      "description": "How many blocks back a block reference may reach on the keyless public.url. It applies only to methods in public.methods and does not add methods.",
+                      "type": "number"
+                    },
+                    "methods": {
+                      "items": {
+                        "type": "string"
+                      },
+                      "type": "array"
+                    },
+                    "rate_limit": {
+                      "properties": {
+                        "batch_max": {
+                          "type": "number"
+                        },
+                        "burst": {
+                          "type": "number"
+                        },
+                        "per_ip_rps": {
+                          "type": "number"
+                        }
+                      },
+                      "required": [
+                        "per_ip_rps",
+                        "burst",
+                        "batch_max"
+                      ],
+                      "type": "object"
+                    },
+                    "send_raw_rate_limit": {
+                      "properties": {
+                        "burst": {
+                          "type": "number"
+                        },
+                        "per_ip_rps": {
+                          "type": "number"
+                        }
+                      },
+                      "required": [
+                        "per_ip_rps",
+                        "burst"
+                      ],
+                      "type": "object"
+                    },
+                    "url": {
+                      "type": "string"
+                    }
+                  },
+                  "required": [
+                    "url",
+                    "methods",
+                    "rate_limit"
+                  ],
+                  "type": "object"
+                },
+                "state_window_blocks": {
+                  "type": [
+                    "number",
+                    "null"
+                  ]
+                },
+                "subscriptions": {
+                  "items": {
+                    "type": "string"
+                  },
+                  "type": "array"
+                },
+                "ws": {
+                  "type": "boolean"
+                }
+              },
+              "required": [
+                "chain"
+              ],
+              "type": "object"
+            },
+            "type": "array"
+          }
+        },
+        "required": [
+          "chains"
+        ],
+        "type": "object"
+      },
+      {
+        "not": {
+          "properties": {
+            "error": {
+              "const": "invalid_tool_arguments",
+              "type": "string"
+            }
+          },
+          "required": [
+            "error"
+          ],
+          "type": "object"
+        }
+      }
+    ]
+  },
+  {
+    "additionalProperties": false,
+    "properties": {
+      "error": {
+        "const": "invalid_tool_arguments",
+        "type": "string"
+      },
+      "message": {
+        "minLength": 1,
+        "type": "string"
+      },
+      "reason": {
+        "enum": [
+          "invalid_root",
+          "schema_type",
+          "schema_enum",
+          "undeclared_property",
+          "credential_field",
+          "credential_value"
+        ],
+        "type": "string"
+      }
+    },
+    "required": [
+      "error",
+      "reason",
+      "message"
+    ],
+    "type": "object"
+  }
+]

removedOutput schema / properties

Removed value: -{
-  "chains": {
-    "items": {
-      "properties": {
-        "chain": {
-          "type": "string"
-        },
-        "chain_id": {
-          "type": "number"
-        },
-        "data": {
-          "type": "boolean"
-        },
-        "jsonrpc": {
-          "type": "boolean"
-        },
-        "max_logs_block_range": {
-          "description": "Max block span of one eth_getLogs request. Both ends are inclusive: toBlock - fromBlock + 1 must not exceed this value, otherwise the call returns logs_range_too_large.",
-          "type": [
-            "number",
-            "null"
-          ]
-        },
-        "methods": {
-          "type": [
-            "object",
-            "null"
-          ]
-        },
-        "name": {
-          "type": "string"
-        },
-        "public": {
-          "properties": {
-            "history_blocks": {
-              "description": "How many blocks back a block reference may reach on the keyless public.url. It applies only to methods in public.methods and does not add methods.",
-              "type": "number"
-            },
-            "methods": {
-              "items": {
-                "type": "string"
-              },
-              "type": "array"
-            },
-            "rate_limit": {
-              "properties": {
-                "batch_max": {
-                  "type": "number"
-                },
-                "burst": {
-                  "type": "number"
-                },
-                "per_ip_rps": {
-                  "type": "number"
-                }
-              },
-              "required": [
-                "per_ip_rps",
-                "burst",
-                "batch_max"
-              ],
-              "type": "object"
-            },
-            "send_raw_rate_limit": {
-              "properties": {
-                "burst": {
-                  "type": "number"
-                },
-                "per_ip_rps": {
-                  "type": "number"
-                }
-              },
-              "required": [
-                "per_ip_rps",
-                "burst"
-              ],
-              "type": "object"
-            },
-            "url": {
-              "type": "string"
-            }
-          },
-          "required": [
-            "url",
-            "methods",
-            "rate_limit"
-          ],
-          "type": "object"
-        },
-        "state_window_blocks": {
-          "type": [
-            "number",
-            "null"
-          ]
-        },
-        "subscriptions": {
-          "items": {
-            "type": "string"
-          },
-          "type": "array"
-        },
-        "ws": {
-          "type": "boolean"
-        }
-      },
-      "required": [
-        "chain"
-      ],
-      "type": "object"
-    },
-    "type": "array"
-  }
-}

removedOutput schema / required
```
Removed value: -[
-  "chains"
-]
```

Changed3 schema fields changedOct 10, 2026

addedInput schema / properties

Added value: +{
+  "chain": {
+    "description": "Optional chain slug (exact match, e.g. 'base_mainnet'). When set, only that chain is returned; unknown slugs return an error listing the available ones. Omit to list all chains.",
+    "type": "string"
+  }
+}

addedOutput schema / properties / chains / items / properties / max_logs_block_range / description

Added value: +"Max block span of one eth_getLogs request. Both ends are inclusive: toBlock - fromBlock + 1 must not exceed this value, otherwise the call returns logs_range_too_large."

addedOutput schema / properties / chains / items / properties / public / properties / history_blocks / description

Added value: +"How many blocks back a block reference may reach on the keyless public.url. It applies only to methods in public.methods and does not add methods."

Changed1 schema field changedOct 3, 2026

addedOutput schema / properties / chains / items / properties / public

Added value: +{
+  "properties": {
+    "history_blocks": {
+      "type": "number"
+    },
+    "methods": {
+      "items": {
+        "type": "string"
+      },
+      "type": "array"
+    },
+    "rate_limit": {
+      "properties": {
+        "batch_max": {
+          "type": "number"
+        },
+        "burst": {
+          "type": "number"
+        },
+        "per_ip_rps": {
+          "type": "number"
+        }
+      },
+      "required": [
+        "per_ip_rps",
+        "burst",
+        "batch_max"
+      ],
+      "type": "object"
+    },
+    "send_raw_rate_limit": {
+      "properties": {
+        "burst": {
+          "type": "number"
+        },
+        "per_ip_rps": {
+          "type": "number"
+        }
+      },
+      "required": [
+        "per_ip_rps",
+        "burst"
+      ],
+      "type": "object"
+    },
+    "url": {
+      "type": "string"
+    }
+  },
+  "required": [
+    "url",
+    "methods",
+    "rate_limit"
+  ],
+  "type": "object"
+}

Changed2 schema fields changedOct 1, 2026
- addedOutput schema / properties / chains / items / properties / subscriptions
```
Added value: +{
+  "items": {
+    "type": "string"
+  },
+  "type": "array"
+}
```
- addedOutput schema / properties / chains / items / properties / ws
```
Added value: +{
+  "type": "boolean"
+}
```

Changed3 schema fields changedSep 30, 2026

addedInput schema / additionalProperties
```
Added value: +false
```
removedInput schema / properties
```
Removed value: -{}
```

changedOutput schema / (root)

Previous value: -nullNew value: +{
+  "properties": {
+    "chains": {
+      "items": {
+        "properties": {
+          "chain": {
+            "type": "string"
+          },
+          "chain_id": {
+            "type": "number"
+          },
+          "data": {
+            "type": "boolean"
+          },
+          "jsonrpc": {
+            "type": "boolean"
+          },
+          "max_logs_block_range": {
+            "type": [
+              "number",
+              "null"
+            ]
+          },
+          "methods": {
+            "type": [
+              "object",
+              "null"
+            ]
+          },
+          "name": {
+            "type": "string"
+          },
+          "state_window_blocks": {
+            "type": [
+              "number",
+              "null"
+            ]
+          }
+        },
+        "required": [
+          "chain"
+        ],
+        "type": "object"
+      },
+      "type": "array"
+    }
+  },
+  "required": [
+    "chains"
+  ],
+  "type": "object"
+}

First observedSep 30, 2026

TDQS

A3.6/5.0

Behavior4/5

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

Annotations already declare readOnlyHint and closed-world scope, and the description adds substantive behavior beyond that: wildcard precedence (deny over allow), the exact inclusive range rule for `max_logs_block_range`, the resulting `logs_range_too_large` failure, and null semantics for `state_window_blocks`. It stops short of mentioning pagination, caching, or rate limits, but the constraint disclosure is well above the annotation baseline.

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

Conciseness3/5

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

Purpose is front-loaded correctly, but roughly two-thirds of the text is field-by-field documentation of the response (`methods.allow/deny`, `state_window_blocks`, `max_logs_block_range`, `public.*`) despite an output schema existing. That is dense, useful-looking but largely misplaced bulk.

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

Completeness4/5

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

For a single-optional-parameter read tool with full schema coverage, annotations, and an output schema, nothing essential to invoking it correctly is missing. The remaining gap is that it never frames the decision of when to reach for this tool rather than a sibling.

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% and the schema already explains the optional `chain` slug, exact-match behavior, and the error on unknown slugs. The description's 'Pass `chain` (a slug such as `base_mainnet`)' restates rather than extends that, so the baseline 3 applies.

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?

Opens with a specific verb+resource: fetch supported blockchain networks and static parameters from `GET /v1/chains`. An agent immediately knows this is the discovery/metadata tool. It does not explicitly contrast with adjacent siblings like `get_method_info` or `get_status`, but the resource is distinct enough that confusion is unlikely.

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

Usage Guidelines3/5

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

The only usage guidance is the `chain` filter: 'Pass `chain` ... to return only that chain,' which is really parameter explanation rather than when-to-use. There is no statement of when an agent should call this versus `get_method_info` or `get_pricing`, and no prerequisites or exclusions are given.

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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