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Chains with sub-200ms block production (e.g., Base Flashblocks) have unreliable "pending" block state. When `flashblocks = true` is set in a chain's config, gas estimation uses `BlockId::latest()` instead of `BlockId::pending()`, matching the upstream x402-rs behavior. Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
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…st-block chains
…as estimation When flashblocks=true, the previous commit only changed gas estimation to use BlockId::latest(). But verification simulation calls (via call_with_fallback) still tried the default "pending" block tag first, which is unreliable on chains with sub-200ms blocks (e.g., Base Flashblocks). The "pending" state can return stale/inconsistent data causing simulations to revert with generic "Contract call failed" errors that don't match the "Unsupported pending" fallback check. Now call_with_fallback accepts a flashblocks flag and skips the pending attempt entirely when true, going straight to BlockId::latest(). This aligns with upstream x402-rs which never forces "pending" on verification calls. Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
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Summary
flashblocks: boolconfig flag toChainConfigfor chains with sub-200ms block production (e.g., Base Flashblocks)BlockId::latest()instead ofBlockId::pending(), which is unreliable on fast-block chainsEvmProviderChanges
src/config.rs: Newflashblocksfield onChainConfig(defaults tofalse)src/chain/evm.rs: ThreadflashblocksthroughEvmProvider, use insend_transaction()gas estimationconfig.toml: Enableflashblocks = truefor Base chainTest plan
cargo test --lib— 141 tests passcargo clippy— no new warnings🤖 Generated with Claude Code