{"slug":"saylorinnovations-com-api-chain-gas-forecast-d3b412","title":"Gas price forecast for 16 EVM chains","host":"saylorinnovations.com","method":"GET","resource":"https://saylorinnovations.com/api/chain/gas-forecast","category":"market","description":"Gas price forecast for 16 EVM chains: next-block base fee, 3- and 6-block projection, 10-block trend, a suggested max fee and send-now-or-wait advice.","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":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":{"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":{"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":{"advice":{"description":"plain-language send or wait suggestion","type":"string"},"base_fee_change_pct_10_blocks":{"description":"base fee change over 10 blocks, percent","type":"number"},"base_fee_trend_10_blocks":{"description":"rising, falling or flat","type":"string"},"chain":{"description":"the chain name that was queried","type":"string"},"chain_id":{"description":"EIP-155 chain id of that network","type":"number"},"in_3_blocks_gwei":{"description":"projected base fee 3 blocks ahead","type":"number"},"in_6_blocks_gwei":{"description":"projected base fee 6 blocks ahead","type":"number"},"next_block_base_fee_gwei":{"description":"base fee of the next block, gwei","type":"number"},"note":{"description":"plain-language reading of the result, including units","type":"string"},"recent_avg_fullness":{"description":"average block fullness over the last 5 blocks","type":"number"},"source":{"description":"where the data was read from","type":"string"},"suggested_max_fee_gwei":{"description":"suggested max fee per gas, gwei","type":"number"},"suggested_priority_fee_gwei":{"description":"node-suggested tip, gwei","type":"number"}},"required":["chain","chain_id","next_block_base_fee_gwei","in_3_blocks_gwei","in_6_blocks_gwei","base_fee_trend_10_blocks","advice","note","source"],"type":"object"},"type":{"const":"json","type":"string"}},"required":["type"],"type":"object"}},"required":["input"],"type":"object"},"history":[],"description_full":"Gas price forecast for 16 EVM chains: next-block base fee, 3- and 6-block projection, 10-block trend, a suggested max fee and send-now-or-wait advice.","last_updated":"2026-10-21T04:12:23.144Z","schemes":["exact"]}