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BlockVectra: multi-chain RPC & Data API

by com.blockvectra
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Send Raw Transaction

send_raw_transaction
Destructive

Broadcast a signed raw transaction to a specified blockchain network via eth_sendRawTransaction. Requires the 'x-api-key' or 'Authorization: Bearer ' HTTP header in your MCP client configuration for full access, or uses the keyless public endpoint if permitted on the chain (keys must not be passed in tool parameters or chat). Returns the transaction hash or JSON-RPC error.

Input Schema

TableJSON Schema
NameRequiredDescriptionDefault
chainYesTarget blockchain network slug (e.g. 'robinhood_mainnet'). Must exist in GET /v1/chains.
raw_txYesSigned raw transaction data as a 0x-prefixed hex string (the RLP-encoded raw transaction).

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: -[
-  {
-    "allOf": [
-      {
-        "properties": {
-          "balance_units": {
-            "description": "Remaining balance units after this request (only present when balance is known and x-bv-meter: 1 was sent).",
-            "type": "integer"
-          },
-          "cu_charged": {
-            "description": "Compute Units billed for this request (only present when charged and x-bv-meter: 1 was sent).",
-            "type": "integer"
-          },
-          "error": {
-            "properties": {
-              "code": {
-                "type": "number"
-              },
-              "docs_url": {
-                "type": [
-                  "string",
-                  "null"
-                ]
-              },
-              "message": {
-                "type": "string"
-              },
-              "reason": {
-                "type": [
-                  "string",
-                  "null"
-                ]
-              }
-            },
-            "type": [
-              "object",
-              "string"
-            ]
-          },
-          "help": {
-            "properties": {
-              "guide_url": {
-                "type": "string"
-              },
-              "tool": {
-                "type": "string"
-              }
-            },
-            "type": "object"
-          },
-          "id": {
-            "type": [
-              "number",
-              "string",
-              "null"
-            ]
-          },
-          "jsonrpc": {
-            "type": "string"
-          },
-          "message": {
-            "type": "string"
-          },
-          "result": {},
-          "signup_url": {
-            "description": "Registration and sign-up URL (returned when rate-limited on the public endpoint).",
-            "type": "string"
-          }
-        },
-        "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"
-  }
-]New value: +[
+  {
+    "allOf": [
+      {
+        "anyOf": [
+          {
+            "allOf": [
+              {
+                "properties": {
+                  "balance_units": {
+                    "description": "Remaining balance units after this request (only present when balance is known and x-bv-meter: 1 was sent).",
+                    "type": "integer"
+                  },
+                  "cu_charged": {
+                    "description": "Compute Units billed for this request (only present when charged and x-bv-meter: 1 was sent).",
+                    "type": "integer"
+                  },
+                  "error": {
+                    "properties": {
+                      "code": {
+                        "type": "number"
+                      },
+                      "docs_url": {
+                        "type": [
+                          "string",
+                          "null"
+                        ]
+                      },
+                      "message": {
+                        "type": "string"
+                      },
+                      "reason": {
+                        "type": [
+                          "string",
+                          "null"
+                        ]
+                      }
+                    },
+                    "type": [
+                      "object",
+                      "string"
+                    ]
+                  },
+                  "help": {
+                    "properties": {
+                      "guide_url": {
+                        "type": "string"
+                      },
+                      "tool": {
+                        "type": "string"
+                      }
+                    },
+                    "type": "object"
+                  },
+                  "id": {
+                    "type": [
+                      "number",
+                      "string",
+                      "null"
+                    ]
+                  },
+                  "jsonrpc": {
+                    "type": "string"
+                  },
+                  "message": {
+                    "type": "string"
+                  },
+                  "result": {},
+                  "signup_url": {
+                    "description": "Registration and sign-up URL (returned when rate-limited on the public endpoint).",
+                    "type": "string"
+                  }
+                },
+                "type": "object"
+              },
+              {
+                "not": {
+                  "properties": {
+                    "error": {
+                      "const": "executor_request_rejected",
+                      "type": "string"
+                    }
+                  },
+                  "required": [
+                    "error"
+                  ],
+                  "type": "object"
+                }
+              }
+            ]
+          },
+          {
+            "additionalProperties": false,
+            "properties": {
+              "error": {
+                "const": "executor_request_rejected",
+                "type": "string"
+              },
+              "message": {
+                "minLength": 1,
+                "type": "string"
+              },
+              "reason": {
+                "enum": [
+                  "chain_required",
+                  "raw_tx_required",
+                  "unknown_chain"
+                ],
+                "type": "string"
+              }
+            },
+            "required": [
+              "error",
+              "reason",
+              "message"
+            ],
+            "type": "object"
+          }
+        ],
+        "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"
+  }
+]
  2. Changed2 schema fields changed
    • addedOutput schema / anyOf
      Added value: +[
+  {
+    "allOf": [
+      {
+        "properties": {
+          "balance_units": {
+            "description": "Remaining balance units after this request (only present when balance is known and x-bv-meter: 1 was sent).",
+            "type": "integer"
+          },
+          "cu_charged": {
+            "description": "Compute Units billed for this request (only present when charged and x-bv-meter: 1 was sent).",
+            "type": "integer"
+          },
+          "error": {
+            "properties": {
+              "code": {
+                "type": "number"
+              },
+              "docs_url": {
+                "type": [
+                  "string",
+                  "null"
+                ]
+              },
+              "message": {
+                "type": "string"
+              },
+              "reason": {
+                "type": [
+                  "string",
+                  "null"
+                ]
+              }
+            },
+            "type": [
+              "object",
+              "string"
+            ]
+          },
+          "help": {
+            "properties": {
+              "guide_url": {
+                "type": "string"
+              },
+              "tool": {
+                "type": "string"
+              }
+            },
+            "type": "object"
+          },
+          "id": {
+            "type": [
+              "number",
+              "string",
+              "null"
+            ]
+          },
+          "jsonrpc": {
+            "type": "string"
+          },
+          "message": {
+            "type": "string"
+          },
+          "result": {},
+          "signup_url": {
+            "description": "Registration and sign-up URL (returned when rate-limited on the public endpoint).",
+            "type": "string"
+          }
+        },
+        "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: -{
-  "balance_units": {
-    "description": "Remaining balance units after this request (only present when balance is known and x-bv-meter: 1 was sent).",
-    "type": "integer"
-  },
-  "cu_charged": {
-    "description": "Compute Units billed for this request (only present when charged and x-bv-meter: 1 was sent).",
-    "type": "integer"
-  },
-  "error": {
-    "properties": {
-      "code": {
-        "type": "number"
-      },
-      "docs_url": {
-        "type": [
-          "string",
-          "null"
-        ]
-      },
-      "message": {
-        "type": "string"
-      },
-      "reason": {
-        "type": [
-          "string",
-          "null"
-        ]
-      }
-    },
-    "type": [
-      "object",
-      "string"
-    ]
-  },
-  "help": {
-    "properties": {
-      "guide_url": {
-        "type": "string"
-      },
-      "tool": {
-        "type": "string"
-      }
-    },
-    "type": "object"
-  },
-  "id": {
-    "type": [
-      "number",
-      "string",
-      "null"
-    ]
-  },
-  "jsonrpc": {
-    "type": "string"
-  },
-  "message": {
-    "type": "string"
-  },
-  "result": {},
-  "signup_url": {
-    "description": "Registration and sign-up URL (returned when rate-limited on the public endpoint).",
-    "type": "string"
-  }
-}
  3. Added

TDQS

A3.7/5.0
Behavior4/5

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

Annotations already declare readOnly=false and destructive=true, and the description adds genuinely new context: the required x-api-key/Authorization header, the warning that keys must not appear in parameters or chat, and the keyless-endpoint fallback. It stops short of warning that a broadcast is irreversible or explaining failure/reversion semantics, which matters for a destructive open-world call.

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?

Three sentences, front-loaded with the action, then auth requirement, then return value. Each sentence carries information, though the auth clause is dense and could be tightened.

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?

An output schema exists, so explaining return values is optional, yet the description still names the tx hash or JSON-RPC error. Auth is covered, which is the main gap for a destructive, open-world tool; only the irreversibility of broadcasting is unaddressed.

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 coverage is 100%, so both parameters are fully documented in the schema, including the hex pattern for raw_tx and the chain slug cross-reference to GET /v1/chains. The description adds no syntax or format detail beyond this, 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?

States a specific verb (broadcast) and resource (signed raw transaction) and names the underlying RPC method (eth_sendRawTransaction), so the agent knows exactly what wire call is made. It doesn't explicitly differentiate from the sibling rpc_call tool, which could also send this payload, so it falls short of a 5.

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?

Provides context on access (API key header vs keyless public endpoint) but gives no guidance on when to pick this tool versus the generic rpc_call sibling, nor when a chain doesn't permit keyless use. Usage is implied rather than stated.

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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