Saylor Innovations Data Desk

Name: Saylor Innovations Data Desk
Price: 0.01 USDC
Availability: InStock

Gas fee history for 16 EVM chains over up to 100 recent blocks: base fee, block fullness and priority tip at chosen percentiles for each block.

DataLiveeip155:8453Exactvia cdp

https://saylorinnovations.com/api/chain/fee-history

Gas fee historyEth feehistoryBase fee trendPriority fee percentilesBlock fullness history

Calls · 30d

This endpoint's own trailing-30-day call count, as published by the upstream catalog and snapshotted daily. 6 snapshots so far.

$15.76

Verified settled volume

1,657 settlements proven x402 by their on-chain EIP-3009 marker.

$0.010

Listed price

As published in the catalog. Always read the live 402 before paying.

Calls · 30d

Upstream's own call count for this endpoint, not ours.

Unique payers · 30d

Last called 2026-10-22 23:31Z

—

Upstream on-chain volume

Reported by the source catalog.

Paid to

0xA2A8dF0f7CaaBEa4e120a2568118f141569fc8aa

The wallet the 402 directs payment to. Its whole payment record — every payer, every chain — is on the merchant page.

Asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913

Provider

The payTo wallet does not resolve to a registered ERC-8004 agent. That is not a verdict on the service — most of the catalog is unregistered.

Live 402 challenge

Captured by the enrichment pass, not read just now. Prices can change — always read the 402 the endpoint answers with.

{
  "error": "Payment required to access this resource.",
  "accepts": [
    {
      "asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
      "extra": {
        "memo": "saylor:datadesk:chain-fee-histor",
        "name": "USD Coin",
        "note": "Base settles through an x402 facilitator. Send payload.signature and payload.authorization (EIP-3009); there is no self-submitted path on this network.",
        "version": "2",
        "facilitatorOnly": true,
        "assetTransferMethod": "eip3009"
      },
      "payTo": "0xA2A8dF0f7CaaBEa4e120a2568118f141569fc8aa",
      "amount": "10000",
      "scheme": "exact",
      "network": "eip155:8453",
      "maxTimeoutSeconds": 120
    },
    {
      "asset": "0x3c499c542cEF5E3811e1192ce70d8cC03d5c3359",
      "extra": {
        "memo": "saylor:datadesk:chain-fee-histor",
        "name": "USD Coin",
        "note": "Polygon settles through an x402 facilitator. Send payload.signature and payload.authorization (EIP-3009); there is no self-submitted path on this network.",
        "version": "2",
        "facilitatorOnly": true,
        "assetTransferMethod": "eip3009"
      },
      "payTo": "0xA2A8dF0f7CaaBEa4e120a2568118f141569fc8aa",
      "amount": "10000",
      "scheme": "exact",
      "network": "eip155:137",
      "maxTimeoutSeconds": 120
    },
    {
      "asset": "0xaf88d065e77c8cC2239327C5EDb3A432268e5831",
      "extra": {
        "memo": "saylor:datadesk:chain-fee-histor",
        "name": "USD Coin",
        "note": "Arbitrum settles through an x402 facilitator. Send payload.signature and payload.authorization (EIP-3009); there is no self-submitted path on this network.",
        "version": "2",
        "facilitatorOnly": true,
        "assetTransferMethod": "eip3009"
      },
      "payTo": "0xA2A8dF0f7CaaBEa4e120a2568118f141569fc8aa",
      "amount": "10000",
      "scheme": "exact",
      "network": "eip155:42161",
      "maxTimeoutSeconds": 120
    },
    {
      "asset": "EPjFWdd5AufqSSqeM2qN1xzybapC8G4wEGGkZwyTDt1v",
      "extra": {
        "memo": "saylor:datadesk:chain-fee-histor",
        "session": "eyJhcnRpY2xlSWQiOiJkYXRhZGVzazpjaGFpbi1mZWUtaGlzdG9yeSIsInJlZmVyZW5jZSI6ImpiWTdqV2tadmZDMkpHalJnaHliOGJVNXI1N0pCTERzTnJpTnJZS2tGcnQiLCJyZWNpcGllbnQiOiI3TFNqZnJKZjhmTnNCOFZBOXU3TjNXRW4yNXNtUUxwb2IzU3Z5VXZYYWN5NyIsIm1pbnQiOiJFUGpGV2RkNUF1ZnFTU3FlTTJxTjF4enliYXBDOEc0d0VHR2tad3lURHQxdiIsIm1pbkFtb3VudCI6MTAwMDAsImV4cCI6MTc5MjU1ODA1ODUzMn0.buDKVS8p4TVbZsvrKKukhXhkLCWe4hiRHhtpeIxR03U",
        "feePayer": "Hc3sdEAsCGQcpgfivywog9uwtk8gUBUZgsxdME1EJy88",
        "reference": "jbY7jWkZvfC2JGjRghyb8bU5r57JBLDsNriNrYKkFrt"
      },
      "payTo": "7LSjfrJf8fNsB8VA9u7N3WEn25smQLpob3SvyUvXacy7",
      "amount": "10000",
      "scheme": "exact",
      "network": "solana:5eykt4UsFv8P8NJdTREpY1vzqKqZKvdp",
      "maxTimeoutSeconds": 120
    },
    {
      "asset": "Es9vMFrzaCERmJfrF4H2FYD4KCoNkY11McCe8BenwNYB",
      "extra": {
        "memo": "saylor:datadesk:chain-fee-histor",
        "session": "eyJhcnRpY2xlSWQiOiJkYXRhZGVzazpjaGFpbi1mZWUtaGlzdG9yeSIsInJlZmVyZW5jZSI6Ikg4SFZwbkNzREJVRkhycFNhbTZRM004cFhKVHk3UGUxVEZHdUFVSmFFNTJYIiwicmVjaXBpZW50IjoiN0xTamZySmY4Zk5zQjhWQTl1N04zV0VuMjVzbVFMcG9iM1N2eVV2WGFjeTciLCJtaW50IjoiRXM5dk1GcnphQ0VSbUpmckY0SDJGWUQ0S0NvTmtZMTFNY0NlOEJlbndOWUIiLCJtaW5BbW91bnQiOjEwMDAwLCJleHAiOjE3OTI1NTgwNTg1MzJ9.-puBmL0acKv6ij3bGI2wR6JCugvrGjjZiKLI2MF7wNI",
        "feePayer": "Hc3sdEAsCGQcpgfivywog9uwtk8gUBUZgsxdME1EJy88",
        "reference": "H8HVpnCsDBUFHrpSam6Q3M8pXJTy7Pe1TFGuAUJaE52X"
      },
      "payTo": "7LSjfrJf8fNsB8VA9u7N3WEn25smQLpob3SvyUvXacy7",
      "amount": "10000",
      "scheme": "exact",
      "network": "solana:5eykt4UsFv8P8NJdTREpY1vzqKqZKvdp",
      "maxTimeoutSeconds": 120
    },
    {
      "asset": "So11111111111111111111111111111111111111112",
      "extra": {
        "memo": "saylor:datadesk:chain-fee-histor",
        "note": "Native SOL: send lamports with a system transfer, not an SPL transfer. Price is quoted live and this quote expires in 120s.",
        "native": true,
        "session": "eyJhcnRpY2xlSWQiOiJkYXRhZGVzazpjaGFpbi1mZWUtaGlzdG9yeSIsInJlZmVyZW5jZSI6IkM2Q1Vnb1N5VG5EZTU5U3lMTGc2d1d4b3JocTVBY3pSaWNFdlUzTVk5NW5DIiwicmVjaXBpZW50IjoiN0xTamZySmY4Zk5zQjhWQTl1N04zV0VuMjVzbVFMcG9iM1N2eVV2WGFjeTciLCJtaW50IjpudWxsLCJtaW5BbW91bnQiOjkxODEyLCJleHAiOjE3OTI1NTgwNTg1MzJ9.sxl7WbctSGxE5LDyYPYmM_eyBWvkJ3Ri6jqiFTjxUIc",
        "reference": "C6CUgoSyTnDe59SyLLg6wWxorhq5AczRicEvU3MY95nC",
        "solUsdPrice": 105.65,
        "quotedLamports": "94652"
      },
      "payTo": "7LSjfrJf8fNsB8VA9u7N3WEn25smQLpob3SvyUvXacy7",
      "amount": "91812",
      "scheme": "exact",
      "network": "solana:5eykt4UsFv8P8NJdTREpY1vzqKqZKvdp",
      "maxTimeoutSeconds": 120
    }
  ],
  "resource": {
    "url": "https://saylorinnovations.com/api/chain/fee-history?chain=ethereum&blocks=10",
    "tags": [
      "gas fee history",
      "eth feehistory",
      "base fee trend",
      "priority fee percentiles",
      "block fullness history"
    ],
    "iconUrl": "https://saylorinnovations.com/og-image.jpg",
    "mimeType": "application/json",
    "description": "Gas fee history for 16 EVM chains over up to 100 recent blocks: base fee, block fullness and priority tip at chosen percentiles for each block.",
    "serviceName": "Saylor Innovations Data Desk"
  },
  "extensions": {
    "tags": [
      "gas fee history",
      "eth feehistory",
      "base fee trend",
      "priority fee percentiles",
      "block fullness history"
    ],
    "bazaar": {
      "info": {
        "input": {
          "type": "http",
          "method": "GET",
          "queryParams": {
            "chain": "ethereum",
            "blocks": "10"
          }
        },
        "output": {
          "type": "json",
          "example": {
            "note": "Per-block base fee, how full the block was, and the priority tip paid at each percentile you asked for, newest block last. next_block_base_fee_gwei is the protocol-computed base fee for the next bloc…",
            "chain": "ethereum",
            "blocks": 10,
            "source": "Chain JSON-RPC (ethereum)",
            "history": [
              {
                "block": 26238043,
                "tip_p10_gwei": 0,
                "tip_p50_gwei": 0.006438,
                "tip_p90_gwei": 1.0062,
                "base_fee_gwei": 0.042112,
                "gas_used_ratio": 0.2804
              },
              {
                "block": 26238044,
                "tip_p10_gwei": 0.0002,
                "tip_p50_gwei": 0.0002,
                "tip_p90_gwei": 2,
                "base_fee_gwei": 0.0398,
                "gas_used_ratio": 0.9994
              },
              {
                "block": 26238045,
                "tip_p10_gwei": 0.000004,
                "tip_p50_gwei": 0.004013,
                "tip_p90_gwei": 1.43,
                "base_fee_gwei": 0.044769,
                "gas_used_ratio": 0.4025
              }
            ],
            "chain_id": 1,
            "percentiles": [
              10,
              50,
              90
            ],
            "avg_tip_gwei": 0.007429,
            "newest_block": 26238052,
            "oldest_block": 26238043,
            "avg_base_fee_gwei": 0.041351,
            "max_base_fee_gwei": 0.044769,
            "min_base_fee_gwei": 0.037133,
            "avg_gas_used_ratio": 0.4802,
            "tip_percentile_used": "p50",
            "next_block_base_fee_gwei": 0.0395
          }
        }
      },
      "schema": {
        "type": "object",
        "$schema": "https://json-schema.org/draft/2020-12/schema",
        "required": [
          "input"
        ],
        "properties": {
          "input": {
            "type": "object",
            "required": [
              "type",
              "method"
            ],
            "properties": {
              "type": {
                "type": "string",
                "const": "http"
              },
              "method": {
                "enum": [
                  "GET"
                ],
                "type": "string"
              },
              "queryParams": {
                "type": "object",
                "required": [
                  "chain"
                ],
                "properties": {
                  "chain": {
                    "type": "string",
                    "description": "chain name (ethereum, base, arbitrum, optimism, polygon, bsc, avalanche, gnosis, linea, scroll, mantle, blast, sonic, celo, berachain, unichain) or chain id"
                  },
                  "blocks": {
                    "type": "string",
                    "description": "optional number of recent blocks, 1 to 100 (default 20)"
                  }
                }
              }
            },
            "additionalProperties": false
          },
          "output": {
            "type": "object",
            "required": [
              "type"
            ],
            "properties": {
              "type": {
                "type": "string",
                "const": "json"
              },
              "example": {
                "type": "object",
                "required": [
                  "chain",
                  "chain_id",
                  "blocks",
                  "next_block_base_fee_gwei",
                  "avg_base_fee_gwei",
                  "history",
                  "note",
                  "source"
                ],
                "properties": {
                  "note": {
                    "type": "string",
                    "description": "plain-language reading of the result, including units"
                  },
                  "chain": {
                    "type": "string",
                    "description": "the chain name that was queried"
                  },
                  "blocks": {
                    "type": "number",
                    "description": "blocks in the history"
                  },
                  "source": {
                    "type": "string",
                    "description": "where the data was read from"
                  },
                  "history": {
                    "type": [
                      "array",
                      "null"
                    ],
                    "items": {
                      "type": "object",
                      "properties": {
                        "block": {
                          "type": [
                            "number",
                            "null"
                          ],
                          "description": "block number"
                        },
                        "tip_p10_gwei": {
                          "type": [
                            "number",
                            "null"
                          ],
                          "description": "10th percentile priority tip, gwei"
                        },
                        "tip_p50_gwei": {
                          "type": [
                            "number",
                            "null"
                          ],
                          "description": "median priority tip, gwei"
                        },
                        "tip_p90_gwei": {
                          "type": [
                            "number",
                            "null"
                          ],
                          "description": "90th percentile priority tip, gwei"
                        },
                        "base_fee_gwei": {
                          "type": [
                            "number",
                            "null"
                          ],
                          "description": "base fee of that block, gwei"
                        },
                        "gas_used_ratio": {
                          "type": [
                            "number",
                            "null"
                          ],
                          "description": "share of the gas limit used"
                        }
                      }
                    },
                    "description": "one entry per block, oldest first"
                  },
                  "chain_id": {
                    "type": "number",
                    "description": "EIP-155 chain id of that network"
                  },
                  "percentiles": {
                    "type": [
                      "array",
                      "null"
                    ],
                    "description": "tip percentiles requested"
                  },
                  "avg_tip_gwei": {
                    "type": [
                      "number",
                      "null"
                    ],
                    "description": "average priority tip at the middle percentile"
                  },
                  "newest_block": {
                    "type": "number",
                    "description": "last block in the history"
                  },
                  "oldest_block": {
                    "type": "number",
                    "description": "first block in the history"
                  },
                  "avg_base_fee_gwei": {
                    "type": "number",
                    "description": "average base fee over the history"
                  },
                  "max_base_fee_gwei": {
                    "type": "number",
                    "description": "highest base fee in the history"
                  },
                  "min_base_fee_gwei": {
                    "type": "number",
                    "description": "lowest base fee in the history"
                  },
                  "avg_gas_used_ratio": {
                    "type": [
                      "number",
                      "null"
                    ],
                    "description": "average share of the gas limit used"
                  },
                  "tip_percentile_used": {
                    "type": "string",
                    "description": "percentile used for avg_tip_gwei"
                  },
                  "next_block_base_fee_gwei": {
                    "type": "number",
                    "description": "protocol base fee for the next block, gwei"
                  }
                }
              }
            }
          }
        }
      }
    },
    "method": "GET",
    "example": {
      "note": "Per-block base fee, how full the block was, and the priority tip paid at each percentile you asked for, newest block last. next_block_base_fee_gwei is the protocol-computed base fee for the next block.",
      "chain": "ethereum",
      "blocks": 10,
      "source": "Chain JSON-RPC (ethereum)",
      "history": [
        {
          "block": 26238043,
          "tip_p10_gwei": 0,
          "tip_p50_gwei": 0.006438,
          "tip_p90_gwei": 1.0062,
          "base_fee_gwei": 0.042112,
          "gas_used_ratio": 0.2804
        },
        {
          "block": 26238044,
          "tip_p10_gwei": 0.0002,
          "tip_p50_gwei": 0.0002,
          "tip_p90_gwei": 2,
          "base_fee_gwei": 0.0398,
          "gas_used_ratio": 0.9994
        },
        {
          "block": 26238045,
          "tip_p10_gwei": 0.000004,
          "tip_p50_gwei": 0.004013,
          "tip_p90_gwei": 1.43,
          "base_fee_gwei": 0.044769,
          "gas_used_ratio": 0.4025
        },
        {
          "block": 26238046,
          "tip_p10_gwei": 0.000004,
          "tip_p50_gwei": 0.01,
          "tip_p90_gwei": 1,
          "base_fee_gwei": 0.043677,
          "gas_used_ratio": 0.3964
        },
        {
          "block": 26238047,
          "tip_p10_gwei": 0.0002,
          "tip_p50_gwei": 0.008735,
          "tip_p90_gwei": 1,
          "base_fee_gwei": 0.042545,
          "gas_used_ratio": 0.4389
        },
        {
          "block": 26238048,
          "tip_p10_gwei": 0.001,
          "tip_p50_gwei": 0.01,
          "tip_p90_gwei": 1,
          "base_fee_gwei": 0.041895,
          "gas_used_ratio": 0.5217
        },
        {
          "block": 26238049,
          "tip_p10_gwei": 0.000004,
          "tip_p50_gwei": 0.008106,
          "tip_p90_gwei": 1,
          "base_fee_gwei": 0.042123,
          "gas_used_ratio": 0.3133
        },
        {
          "block": 26238050,
          "tip_p10_gwei": 0,
          "tip_p50_gwei": 0.00877,
          "tip_p90_gwei": 1,
          "base_fee_gwei": 0.040157,
          "gas_used_ratio": 0.4143
        },
        {
          "block": 26238051,
          "tip_p10_gwei": 0.000004,
          "tip_p50_gwei": 0.007032,
          "tip_p90_gwei": 1,
          "base_fee_gwei": 0.039297,
          "gas_used_ratio": 0.2798
        },
        {
          "block": 26238052,
          "tip_p10_gwei": 0.0001,
          "tip_p50_gwei": 0.011,
          "tip_p90_gwei": 2,
          "base_fee_gwei": 0.037133,
          "gas_used_ratio": 0.755
        }
      ],
      "chain_id": 1,
      "percentiles": [
        10,
        50,
        90
      ],
      "avg_tip_gwei": 0.007429,
      "newest_block": 26238052,
      "oldest_block": 26238043,
      "avg_base_fee_gwei": 0.041351,
      "max_base_fee_gwei": 0.044769,
      "min_base_fee_gwei": 0.037133,
      "avg_gas_used_ratio": 0.4802,
      "tip_percentile_used": "p50",
      "next_block_base_fee_gwei": 0.0395
    },
    "license": "LicenseRef-Saylor-Agent-Use-1.0",
    "mimeType": "application/json",
    "freshness": "fetched live (cached up to 1 hour for large reference files)",
    "tokenCount": null,
    "inputSchema": {
      "chain": "chain name (ethereum, base, arbitrum, optimism, polygon, bsc, avalanche, gnosis, linea, scroll, mantle, blast, sonic, celo, berachain, unichain) or chain id",
      "blocks": "optional number of recent blocks, 1 to 100 (default 20)",
      "percentiles": "optional comma-separated tip percentiles, 1 to 5 values between 1 and 99 in increasing order (default 10,50,90)"
    },
    "serviceName": "Saylor Innovations Data Desk",
    "instructions": "STANDARD PATH (works with stock x402 clients): send payload.transaction — a base64 partially-signed Solana transaction — and we route verify/settle through an x402 facilitator that sponsors the fee and submits it. Include the chosen accepts entry as \"accepted\" so we can match terms. ALTERNATIVE PATH (no facilitator): Pick ONE entry from accepts and use the reference and session from THAT entry — each asset has its own. USDC or USDT: send an SPL transfer of the exact amount. Native SOL (asset=So11111111111111111111111111111111111111112, extra.native=true): send that many lamports with a system transfer. Either way include extra.reference as a read-only account (Solana Pay style), then retry with PAYMENT-SIGNATURE: base64({x402Version:2, payload:{session, reference}}). If your client cannot attach a reference, send payload.signature instead (USDC only). SOL amounts are quoted live and expire in 120s; stablecoins do not move. The facilitator path verifies and settles in this request. Only the alternative self-submitted Solana path needs retries while the transfer is indexed (typically 3-4 attempts over 10-20s). On that path, a 402 saying \"payment not found on-chain yet\" means keep retrying.",
    "outputSchema": {
      "type": "object",
      "required": [
        "chain",
        "chain_id",
        "blocks",
        "next_block_base_fee_gwei",
        "avg_base_fee_gwei",
        "history",
        "note",
        "source"
      ],
      "properties": {
        "note": {
          "type": "string",
          "description": "plain-language reading of the result, including units"
        },
        "chain": {
          "type": "string",
          "description": "the chain name that was queried"
        },
        "blocks": {
          "type": "number",
          "description": "blocks in the history"
        },
        "source": {
          "type": "string",
          "description": "where the data was read from"
        },
        "history": {
          "type": [
            "array",
            "null"
          ],
          "items": {
            "type": "object",
            "properties": {
              "block": {
                "type": [
                  "number",
                  "null"
                ],
                "description": "block number"
              },
              "tip_p10_gwei": {
                "type": [
                  "number",
                  "null"
                ],
                "description": "10th percentile priority tip, gwei"
              },
              "tip_p50_gwei": {
                "type": [
                  "number",
                  "null"
                ],
                "description": "median priority tip, gwei"
              },
              "tip_p90_gwei": {
                "type": [
                  "number",
                  "null"
                ],
                "description": "90th percentile priority tip, gwei"
              },
              "base_fee_gwei": {
                "type": [
                  "number",
                  "null"
                ],
                "description": "base fee of that block, gwei"
              },
              "gas_used_ratio": {
                "type": [
                  "number",
                  "null"
                ],
                "description": "share of the gas limit used"
              }
            }
          },
          "description": "one entry per block, oldest first"
        },
        "chain_id": {
          "type": "number",
          "description": "EIP-155 chain id of that network"
        },
        "percentiles": {
          "type": [
            "array",
            "null"
          ],
          "description": "tip percentiles requested"
        },
        "avg_tip_gwei": {
          "type": [
            "number",
            "null"
          ],
          "description": "average priority tip at the middle percentile"
        },
        "newest_block": {
          "type": "number",
          "description": "last block in the history"
        },
        "oldest_block": {
          "type": "number",
          "description": "first block in the history"
        },
        "avg_base_fee_gwei": {
          "type": "number",
          "description": "average base fee over the history"
        },
        "max_base_fee_gwei": {
          "type": "number",
          "description": "highest base fee in the history"
        },
        "min_base_fee_gwei": {
          "type": "number",
          "description": "lowest base fee in the history"
        },
        "avg_gas_used_ratio": {
          "type": [
            "number",
            "null"
          ],
          "description": "average share of the gas limit used"
        },
        "tip_percentile_used": {
          "type": "string",
          "description": "percentile used for avg_tip_gwei"
        },
        "next_block_base_fee_gwei": {
          "type": "number",
          "description": "protocol base fee for the next block, gwei"
        }
      }
    },
    "noPathTemplate": true,
    "settlementModes": [
      "facilitator-transaction",
      "self-submitted-reference"
    ],
    "typicalLatencyMs": 700
  },
  "x402Version": 2
}

Accepts

The payment requirements as published to the catalog. Read the live 402 before paying — a price here is a claim, not a quote.

0.01USDC≈ $0.01 USD

on Base · exact scheme

Pay 0.01 USDC on Base to 0xA2A8…fc8aa. The signed payment is good for 2 minutes.

Paid to: 0xA2A8…fc8aa
USD Coin contract: 0x8335…02913
Payment window: 2 minutes
As published: 10000 smallest units

10000units

on Polygon · exact scheme