{"slug":"saylorinnovations-com-api-gas-preflight-7c77b1","title":"Gas conditions for 7 EVM chains","host":"saylorinnovations.com","method":"GET","resource":"https://saylorinnovations.com/api/gas/preflight","category":"other","description":"Gas conditions for 7 EVM chains: base fee, trend, congestion, priority tips, suggested max fee and USD cost of a transfer, approval, swap and mint.","price_listed":0.01,"price_asked":null,"state":"effects","state_label":"Not tested: has real-world effects","checks_7d":0,"answered_7d":0,"latency_ms_median":null,"reported_calls_30d":2,"reported_payers_30d":2,"networks":["eip155:137","eip155:42161","eip155:8453","solana:5eykt4UsFv8P8NJdTREpY1vzqKqZKvdp"],"badge":"unverified","paid_checks_7d":0,"paid_ok_7d":0,"example_input":{"method":"GET","queryParams":{"chain":"base"},"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":{"chain":{"description":"optional: ethereum, base (default), arbitrum, optimism, polygon, bsc or avalanche","type":"string"}},"type":"object"},"type":{"const":"http","type":"string"}},"required":["type","method"],"type":"object"},"output":{"properties":{"example":{"properties":{"base_fee_gwei":{"description":"Base fee per gas in gwei","type":"number"},"base_fee_trend":{"description":"Base fee trend","type":"string"},"block_age_seconds":{"description":"Seconds since the latest block","type":"number"},"block_number":{"description":"Block number","type":"number"},"chain":{"description":"Blockchain the data is for","type":"string"},"congestion":{"type":"string"},"cost_estimates":{"description":"Cost estimates","type":"object"},"gas_used_ratio_avg":{"description":"Gas used ratio avg","type":["number","null"]},"l2_note":{"description":"L2 note","type":["string","null"]},"native_price_usd":{"description":"Native price, in US dollars","type":["number","null"]},"native_symbol":{"description":"Native symbol","type":"string"},"note":{"description":"Caveat or context for reading the result","type":"string"},"priority_fee_gwei":{"description":"Priority fee, in gwei","type":"object"},"source":{"description":"Data source the values come from","type":"string"},"suggested_max_fee_gwei":{"description":"Suggested max fee, in gwei","type":"object"}},"required":["chain","native_symbol","block_number","base_fee_gwei","congestion","priority_fee_gwei","suggested_max_fee_gwei","cost_estimates","note","source"],"type":"object"},"type":{"const":"json","type":"string"}},"required":["type"],"type":"object"}},"required":["input"],"type":"object"},"history":[],"description_full":"Gas conditions for 7 EVM chains: base fee, trend, congestion, priority tips, suggested max fee and USD cost of a transfer, approval, swap and mint.","last_updated":"2026-10-21T04:42:02.899Z","schemes":["exact"]}