{
  "x402Version": 2,
  "id": 25756,
  "slug": "25756",
  "resource": "https://api.onesource.io/standard/v1/backing/history",
  "description": "The Standard Reserve (TSR), an on-chain reserve protocol on Robinhood Chain. Backing-ratio history, joined against circulating supply as of each snapshot block. Fields ending in _raw are 18-decimal integers as strings. Divide by 1e18 to get token amounts.",
  "type": "http",
  "resourceType": "Blockchain Data",
  "accepts": [
    {
      "scheme": "exact",
      "network": "eip155:8453",
      "payTo": "0x52E29e0d2Aa49bfBfC548C0A9F2196F4aa51f3ea",
      "asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
      "amount": "20000",
      "amountUsd": 0.02,
      "maxTimeoutSeconds": 3600
    }
  ],
  "outputSchema": {
    "properties": {
      "example": {
        "description": "Endpoint-specific response payload",
        "properties": {
          "as_of_block": {
            "type": "integer"
          },
          "basis": {
            "type": "string"
          },
          "chain_id": {
            "type": "integer"
          },
          "history": {
            "items": {
              "properties": {
                "basis": {
                  "type": "string"
                },
                "block": {
                  "type": "integer"
                },
                "circulating_raw": {
                  "type": "string"
                },
                "contraction_eth_raw": {
                  "type": "string"
                },
                "eth_backing_per_standard_excluding_pol": {
                  "type": "string"
                },
                "expansion_eth_raw": {
                  "type": "string"
                },
                "pol_eth_raw": {
                  "type": [
                    "string",
                    "null"
                  ]
                },
                "pol_std_raw": {
                  "type": [
                    "string",
                    "null"
                  ]
                },
                "ts": {
                  "type": "string"
                }
              },
              "type": "object"
            },
            "type": "array"
          },
          "lag_blocks": {
            "type": "integer"
          },
          "network": {
            "type": "string"
          },
          "serving_state": {
            "type": "string"
          }
        },
        "type": "object"
      },
      "type": {
        "type": "string"
      }
    },
    "required": [
      "type"
    ],
    "type": "object"
  },
  "extensions": {
    "bazaar": {
      "info": {
        "input": {
          "method": "GET",
          "queryParams": {
            "hours": 24
          },
          "type": "http"
        },
        "output": {
          "example": {
            "as_of_block": 63824000,
            "basis": "backing_history",
            "chain_id": 4663,
            "history": [
              {
                "basis": "measured",
                "block": 63800000,
                "circulating_raw": "500000000000000000000000",
                "contraction_eth_raw": "9000000000000000000",
                "eth_backing_per_standard_excluding_pol": "0.000054",
                "expansion_eth_raw": "18000000000000000000",
                "pol_eth_raw": null,
                "pol_std_raw": null,
                "ts": "2026-09-14T12:00:00Z"
              }
            ],
            "lag_blocks": 5,
            "network": "robinhood",
            "serving_state": "fresh"
          },
          "type": "json"
        }
      },
      "schema": {
        "$schema": "https://json-schema.org/draft/2020-12/schema",
        "properties": {
          "input": {
            "additionalProperties": false,
            "properties": {
              "method": {
                "enum": [
                  "GET",
                  "HEAD",
                  "DELETE"
                ],
                "type": "string"
              },
              "queryParams": {
                "properties": {
                  "hours": {
                    "minimum": 1,
                    "type": "integer"
                  }
                },
                "type": "object"
              },
              "type": {
                "const": "http",
                "type": "string"
              }
            },
            "required": [
              "type",
              "method"
            ],
            "type": "object"
          },
          "output": {
            "properties": {
              "example": {
                "description": "Endpoint-specific response payload",
                "properties": {
                  "as_of_block": {
                    "type": "integer"
                  },
                  "basis": {
                    "type": "string"
                  },
                  "chain_id": {
                    "type": "integer"
                  },
                  "history": {
                    "items": {
                      "properties": {
                        "basis": {
                          "type": "string"
                        },
                        "block": {
                          "type": "integer"
                        },
                        "circulating_raw": {
                          "type": "string"
                        },
                        "contraction_eth_raw": {
                          "type": "string"
                        },
                        "eth_backing_per_standard_excluding_pol": {
                          "type": "string"
                        },
                        "expansion_eth_raw": {
                          "type": "string"
                        },
                        "pol_eth_raw": {
                          "type": [
                            "string",
                            "null"
                          ]
                        },
                        "pol_std_raw": {
                          "type": [
                            "string",
                            "null"
                          ]
                        },
                        "ts": {
                          "type": "string"
                        }
                      },
                      "type": "object"
                    },
                    "type": "array"
                  },
                  "lag_blocks": {
                    "type": "integer"
                  },
                  "network": {
                    "type": "string"
                  },
                  "serving_state": {
                    "type": "string"
                  }
                },
                "type": "object"
              },
              "type": {
                "type": "string"
              }
            },
            "required": [
              "type"
            ],
            "type": "object"
          }
        },
        "required": [
          "input"
        ],
        "type": "object"
      }
    }
  },
  "tags": [
    "bazaar"
  ],
  "sourceHost": "api.onesource.io",
  "lastUpdated": "2026-10-08T05:31:36.57Z",
  "quality": {
    "calls30d": 43,
    "uniquePayers30d": 43,
    "lastCalledAt": "2026-10-08T05:31:36.299Z"
  },
  "metadata": {
    "extensions": {
      "bazaar": {
        "info": {
          "input": {
            "method": "GET",
            "queryParams": {
              "hours": 24
            },
            "type": "http"
          },
          "output": {
            "example": {
              "as_of_block": 63824000,
              "basis": "backing_history",
              "chain_id": 4663,
              "history": [
                {
                  "basis": "measured",
                  "block": 63800000,
                  "circulating_raw": "500000000000000000000000",
                  "contraction_eth_raw": "9000000000000000000",
                  "eth_backing_per_standard_excluding_pol": "0.000054",
                  "expansion_eth_raw": "18000000000000000000",
                  "pol_eth_raw": null,
                  "pol_std_raw": null,
                  "ts": "2026-09-14T12:00:00Z"
                }
              ],
              "lag_blocks": 5,
              "network": "robinhood",
              "serving_state": "fresh"
            },
            "type": "json"
          }
        },
        "schema": {
          "$schema": "https://json-schema.org/draft/2020-12/schema",
          "properties": {
            "input": {
              "additionalProperties": false,
              "properties": {
                "method": {
                  "enum": [
                    "GET",
                    "HEAD",
                    "DELETE"
                  ],
                  "type": "string"
                },
                "queryParams": {
                  "properties": {
                    "hours": {
                      "minimum": 1,
                      "type": "integer"
                    }
                  },
                  "type": "object"
                },
                "type": {
                  "const": "http",
                  "type": "string"
                }
              },
              "required": [
                "type",
                "method"
              ],
              "type": "object"
            },
            "output": {
              "properties": {
                "example": {
                  "description": "Endpoint-specific response payload",
                  "properties": {
                    "as_of_block": {
                      "type": "integer"
                    },
                    "basis": {
                      "type": "string"
                    },
                    "chain_id": {
                      "type": "integer"
                    },
                    "history": {
                      "items": {
                        "properties": {
                          "basis": {
                            "type": "string"
                          },
                          "block": {
                            "type": "integer"
                          },
                          "circulating_raw": {
                            "type": "string"
                          },
                          "contraction_eth_raw": {
                            "type": "string"
                          },
                          "eth_backing_per_standard_excluding_pol": {
                            "type": "string"
                          },
                          "expansion_eth_raw": {
                            "type": "string"
                          },
                          "pol_eth_raw": {
                            "type": [
                              "string",
                              "null"
                            ]
                          },
                          "pol_std_raw": {
                            "type": [
                              "string",
                              "null"
                            ]
                          },
                          "ts": {
                            "type": "string"
                          }
                        },
                        "type": "object"
                      },
                      "type": "array"
                    },
                    "lag_blocks": {
                      "type": "integer"
                    },
                    "network": {
                      "type": "string"
                    },
                    "serving_state": {
                      "type": "string"
                    }
                  },
                  "type": "object"
                },
                "type": {
                  "type": "string"
                }
              },
              "required": [
                "type"
              ],
              "type": "object"
            }
          },
          "required": [
            "input"
          ],
          "type": "object"
        }
      }
    }
  },
  "liveness": {
    "reliability": null
  },
  "verified": false,
  "featured": false,
  "provider": {
    "host": "api.onesource.io",
    "manifest_name": "api.onesource.io",
    "source": "cdp-mirror",
    "source_manifest_url": "https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources",
    "submitted_at": "2026-10-14T01:15:01.050Z"
  },
  "exampleResponse": {
    "example": {
      "as_of_block": 0,
      "basis": "string",
      "chain_id": 0,
      "history": [
        {
          "basis": "string",
          "block": 0,
          "circulating_raw": "string",
          "contraction_eth_raw": "string",
          "eth_backing_per_standard_excluding_pol": "string",
          "expansion_eth_raw": "string",
          "pol_eth_raw": "string",
          "pol_std_raw": "string",
          "ts": "string"
        }
      ],
      "lag_blocks": 0,
      "network": "string",
      "serving_state": "string"
    },
    "type": "string"
  }
}