{"slug":"saylorinnovations-com-api-chain-fee-history-58259f","title":"Gas fee history for 16 EVM chains over up to 100 recent blocks","host":"saylorinnovations.com","method":"GET","resource":"https://saylorinnovations.com/api/chain/fee-history","category":"other","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.","price_listed":0.01,"price_asked":0.01,"state":"answering","state_label":"Answering","checks_7d":1,"answered_7d":1,"latency_ms_median":489,"reported_calls_30d":1,"reported_payers_30d":1,"networks":["eip155:137","eip155:42161","eip155:8453","solana:5eykt4UsFv8P8NJdTREpY1vzqKqZKvdp"],"badge":"unverified","paid_checks_7d":0,"paid_ok_7d":0,"example_input":{"method":"GET","queryParams":{"blocks":"10","chain":"ethereum"},"type":"http"},"output_schema":{"$schema":"https://json-schema.org/draft/2020-12/schema","properties":{"input":{"additionalProperties":false,"properties":{"method":{"enum":["GET"],"type":"string"},"queryParams":{"properties":{"blocks":{"description":"optional number of recent blocks, 1 to 100 (default 20)","type":"string"},"chain":{"description":"chain name (ethereum, base, arbitrum, optimism, polygon, bsc, avalanche, gnosis, linea, scroll, mantle, blast, sonic, celo, berachain, unichain) or chain id","type":"string"}},"required":["chain"],"type":"object"},"type":{"const":"http","type":"string"}},"required":["type","method"],"type":"object"},"output":{"properties":{"example":{"properties":{"avg_base_fee_gwei":{"description":"average base fee over the history","type":"number"},"avg_gas_used_ratio":{"description":"average share of the gas limit used","type":["number","null"]},"avg_tip_gwei":{"description":"average priority tip at the middle percentile","type":["number","null"]},"blocks":{"description":"blocks in the history","type":"number"},"chain":{"description":"the chain name that was queried","type":"string"},"chain_id":{"description":"EIP-155 chain id of that network","type":"number"},"history":{"description":"one entry per block, oldest first","items":{"properties":{"base_fee_gwei":{"description":"base fee of that block, gwei","type":["number","null"]},"block":{"description":"block number","type":["number","null"]},"gas_used_ratio":{"description":"share of the gas limit used","type":["number","null"]},"tip_p10_gwei":{"description":"10th percentile priority tip, gwei","type":["number","null"]},"tip_p50_gwei":{"description":"median priority tip, gwei","type":["number","null"]},"tip_p90_gwei":{"description":"90th percentile priority tip, gwei","type":["number","null"]}},"type":"object"},"type":["array","null"]},"max_base_fee_gwei":{"description":"highest base fee in the history","type":"number"},"min_base_fee_gwei":{"description":"lowest base fee in the history","type":"number"},"newest_block":{"description":"last block in the history","type":"number"},"next_block_base_fee_gwei":{"description":"protocol base fee for the next block, gwei","type":"number"},"note":{"description":"plain-language reading of the result, including units","type":"string"},"oldest_block":{"description":"first block in the history","type":"number"},"percentiles":{"description":"tip percentiles requested","type":["array","null"]},"source":{"description":"where the data was read from","type":"string"},"tip_percentile_used":{"description":"percentile used for avg_tip_gwei","type":"string"}},"required":["chain","chain_id","blocks","next_block_base_fee_gwei","avg_base_fee_gwei","history","note","source"],"type":"object"},"type":{"const":"json","type":"string"}},"required":["type"],"type":"object"}},"required":["input"],"type":"object"},"history":[{"day":"2026-10-21","reachable":true,"status":402,"valid_402":true,"asked_usdc":0.01,"price_match":true,"latency_ms":489,"error":null}],"description_full":"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.","last_updated":"2026-10-21T04:12:21.795Z","schemes":["exact"]}