{
  "openapi": "3.0.3",
  "info": {
    "title": "NEAR Data API - Block Headers",
    "version": "3.0.3",
    "description": "Fetch only a finalized block's header and chunk summaries — no per-shard payload."
  },
  "paths": {
    "/v0/block/{block_height}/headers": {
      "get": {
        "description": "Fetch only a finalized block's header and chunk summaries — no per-shard payload.",
        "operationId": "get_block_headers",
        "parameters": [
          {
            "description": "NEAR block height to retrieve.",
            "example": "50000000",
            "in": "path",
            "name": "block_height",
            "required": true,
            "schema": {
              "type": "string"
            }
          },
          {
            "description": "Optional FastNEAR subscription API key. Invalid values may return `401` before redirect handling.",
            "in": "query",
            "name": "apiKey",
            "required": false,
            "schema": {
              "type": "string"
            }
          }
        ],
        "responses": {
          "200": {
            "content": {
              "application/json": {
                "schema": {
                  "$ref": "#/components/schemas/BlockEnvelope",
                  "nullable": true
                }
              }
            },
            "description": "Requested document, or `null` when the selected slice is absent"
          },
          "302": {
            "description": "Redirect to a canonical archive or finalized block URL",
            "headers": {
              "Location": {
                "schema": {
                  "type": "string"
                }
              }
            }
          },
          "401": {
            "content": {
              "text/plain": {
                "example": "Unauthorized",
                "schema": {
                  "type": "string"
                }
              }
            },
            "description": "Invalid or unauthorized API key"
          },
          "404": {
            "content": {
              "application/json": {
                "example": {
                  "error": "The block does not exist in this archive range",
                  "type": "BLOCK_DOES_NOT_EXIST"
                },
                "schema": {
                  "$ref": "#/components/schemas/BlockErrorResponse"
                }
              }
            },
            "description": "Structured block-height error"
          },
          "500": {
            "content": {
              "application/json": {
                "schema": {
                  "type": "string"
                }
              }
            },
            "description": "Cache or internal data error"
          }
        },
        "summary": "Fetch the block-level object for a finalized block",
        "tags": [
          "blocks"
        ]
      }
    }
  },
  "servers": [
    {
      "description": "Mainnet",
      "url": "https://mainnet.neardata.xyz"
    },
    {
      "description": "Testnet",
      "url": "https://testnet.neardata.xyz"
    }
  ],
  "components": {
    "schemas": {
      "BlockEnvelope": {
        "additionalProperties": false,
        "description": "Block-level payload returned by neardata.",
        "properties": {
          "author": {
            "description": "Block producer account ID.",
            "type": "string"
          },
          "chunks": {
            "items": {
              "$ref": "#/components/schemas/ChunkHeader"
            },
            "type": "array"
          },
          "header": {
            "$ref": "#/components/schemas/BlockHeader"
          }
        },
        "required": [
          "author",
          "chunks",
          "header"
        ],
        "type": "object"
      },
      "BlockErrorResponse": {
        "additionalProperties": false,
        "properties": {
          "error": {
            "type": "string"
          },
          "type": {
            "$ref": "#/components/schemas/BlockErrorType"
          }
        },
        "required": [
          "error",
          "type"
        ],
        "type": "object"
      },
      "BlockErrorType": {
        "enum": [
          "BLOCK_HEIGHT_TOO_HIGH",
          "BLOCK_HEIGHT_TOO_LOW",
          "BLOCK_DOES_NOT_EXIST"
        ],
        "type": "string"
      },
      "BlockHeader": {
        "additionalProperties": true,
        "description": "Block header object as served by neardata.",
        "properties": {
          "chunks_included": {
            "format": "uint64",
            "type": "integer"
          },
          "epoch_id": {
            "type": "string"
          },
          "gas_price": {
            "type": "string"
          },
          "hash": {
            "type": "string"
          },
          "height": {
            "format": "uint64",
            "type": "integer"
          },
          "next_epoch_id": {
            "type": "string"
          },
          "prev_hash": {
            "type": "string"
          },
          "prev_height": {
            "format": "uint64",
            "type": "integer"
          },
          "timestamp": {
            "type": "integer"
          },
          "timestamp_nanosec": {
            "type": "string"
          },
          "total_supply": {
            "type": "string"
          }
        },
        "type": "object"
      },
      "ChunkHeader": {
        "additionalProperties": true,
        "description": "Chunk header object as served by neardata.",
        "properties": {
          "chunk_hash": {
            "type": "string"
          },
          "gas_limit": {
            "type": "integer"
          },
          "gas_used": {
            "type": "integer"
          },
          "height_created": {
            "format": "uint64",
            "type": "integer"
          },
          "height_included": {
            "format": "uint64",
            "type": "integer"
          },
          "outcome_root": {
            "type": "string"
          },
          "outgoing_receipts_root": {
            "type": "string"
          },
          "prev_block_hash": {
            "type": "string"
          },
          "shard_id": {
            "format": "uint64",
            "type": "integer"
          },
          "tx_root": {
            "type": "string"
          }
        },
        "type": "object"
      }
    }
  }
}