{
  "openapi": "3.1.0",
  "info": {
    "title": "NEAR Protocol RPC: Get state changes",
    "description": "Fetch detailed state changes in a block — filter by account, key prefix, or change type.",
    "version": "1.0.0"
  },
  "servers": [
    {
      "url": "https://rpc.mainnet.fastnear.com",
      "description": "Mainnet"
    },
    {
      "url": "https://rpc.testnet.fastnear.com",
      "description": "Testnet"
    },
    {
      "url": "https://archival-rpc.mainnet.fastnear.com",
      "description": "Mainnet Archival"
    },
    {
      "url": "https://archival-rpc.testnet.fastnear.com",
      "description": "Testnet Archival"
    }
  ],
  "paths": {
    "/": {
      "post": {
        "operationId": "changes",
        "summary": "Get state changes",
        "description": "Fetch detailed state changes in a block — filter by account, key prefix, or change type.",
        "requestBody": {
          "required": true,
          "content": {
            "application/json": {
              "schema": {
                "type": "object",
                "required": [
                  "jsonrpc",
                  "id",
                  "method",
                  "params"
                ],
                "properties": {
                  "jsonrpc": {
                    "type": "string",
                    "enum": [
                      "2.0"
                    ]
                  },
                  "id": {
                    "type": "string",
                    "example": "fastnear"
                  },
                  "method": {
                    "type": "string",
                    "enum": [
                      "changes"
                    ]
                  },
                  "params": {
                    "type": "object",
                    "description": "One of multiple possible types"
                  }
                }
              },
              "examples": {
                "mainnet": {
                  "summary": "Get state changes (Mainnet)",
                  "value": {
                    "jsonrpc": "2.0",
                    "id": "fastnear",
                    "method": "changes",
                    "params": {
                      "finality": "final",
                      "changes_type": "account_changes",
                      "account_ids": [
                        "root.near"
                      ]
                    }
                  }
                },
                "testnet": {
                  "summary": "Get state changes (Testnet)",
                  "value": {
                    "jsonrpc": "2.0",
                    "id": "fastnear",
                    "method": "changes",
                    "params": {
                      "finality": "final",
                      "changes_type": "account_changes",
                      "account_ids": [
                        "root.testnet"
                      ]
                    }
                  }
                }
              }
            }
          }
        },
        "responses": {
          "200": {
            "description": "Successful response",
            "content": {
              "application/json": {
                "schema": {
                  "$ref": "#/components/schemas/JsonRpcResponse"
                }
              }
            }
          },
          "403": {
            "description": "The supplied API key was not recognized.",
            "content": {
              "text/plain": {
                "schema": {
                  "type": "string"
                },
                "example": "Invalid API key"
              }
            }
          }
        }
      }
    }
  },
  "security": [
    {},
    {
      "BearerAuth": []
    },
    {
      "ApiKeyAuth": []
    }
  ],
  "components": {
    "securitySchemes": {
      "BearerAuth": {
        "type": "http",
        "scheme": "bearer",
        "description": "FastNEAR API key as an `Authorization: Bearer` header. Preferred for backends, workers, and proxies because it keeps the key out of URLs and logs."
      },
      "ApiKeyAuth": {
        "type": "apiKey",
        "in": "query",
        "name": "apiKey",
        "description": "FastNEAR API key as the `apiKey` query parameter. Handy for curl or clients that cannot set headers, but the key can end up in URLs, logs, and shell history."
      }
    },
    "schemas": {
      "JsonRpcResponse": {
        "type": "object",
        "required": [
          "jsonrpc",
          "id"
        ],
        "properties": {
          "jsonrpc": {
            "type": "string",
            "enum": [
              "2.0"
            ]
          },
          "id": {
            "oneOf": [
              {
                "type": "string"
              },
              {
                "type": "number"
              }
            ]
          },
          "result": {
            "type": "object",
            "properties": {
              "block_hash": {
                "type": "string",
                "description": "Base58-encoded hash"
              },
              "changes": {
                "type": "array",
                "items": {
                  "type": "object",
                  "properties": {
                    "cause": {
                      "type": "object",
                      "description": "One of multiple possible types"
                    }
                  },
                  "required": [
                    "cause"
                  ]
                }
              }
            },
            "required": [
              "block_hash",
              "changes"
            ]
          },
          "error": {
            "type": "object",
            "properties": {
              "code": {
                "type": "integer"
              },
              "message": {
                "type": "string"
              },
              "data": {
                "type": "object"
              }
            }
          }
        }
      }
    }
  }
}