Ledger APIs

These six APIs read ledger-level data — the current ledger's sequence and base fee, the last-closed ledger's time and hash, a general-purpose nonce, and keylet range enumeration. They were originally documented together with the slot family on a single "Ledger and Slot APIs" page; that page has been split in two, and this page covers the ledger-info half.

All signatures are copied verbatim from hook/extern.h. Return codes reference the shared error table in ../../glossary.md; values come from include/xrpl/hook/Enum.h and hook/error.h. Implementations live in src/xrpld/app/hook/detail/HookAPI.cpp (core logic) and src/xrpld/app/hook/detail/applyHook.cpp (WASM-facing wrappers).

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Index

Function	Purpose
fee_base	Base fee (drops) of the current ledger.
ledger_seq	Current ledger sequence number.
ledger_last_time	Close time of the last closed ledger.
ledger_last_hash	Hash of the last closed ledger.
ledger_nonce	A unique per-call nonce.
ledger_keylet	Enumerate the next keylet in a lo..hi range.

Related documents

• ../../README.md — documentation index.
• ../../overview.md — hook execution model and lifecycle.
• ../../glossary.md — full error-code and term reference.
• ../../macros.md — SBUF, GUARD, and buffer helpers.
• ../../best-practices.md — slot budgets and iterating ledger objects.
• Slot APIs — slot_set, slot_subfield, meta_slot, xpop_slot, and the rest of the slot family.
• control.md — hook_again and the strong/weak execution model.
• transaction.md — otxn_slot, otxn_field, and originating-txn access.
• emit-and-etxn.md — etxn_fee_base, etxn_nonce, and emission.
• utility.md — util_keylet for building the keylets slot_set/ledger_keylet consume.