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Insert, delete, replace, extract, locate or measure at exact character offsets, counting by grapheme, code point or UTF-16 unit, with the affected range reported in both the chosen unit and UTF-16. Called as POST /v1/text/char-edit, it takes text, op, unit, index and returns op, unit, text, inputLength. Character-indexed string edits are a measured failure mode for language models (arXiv:2409.15452), and the index a model reasons about is rarely the index a runtime uses: a skin-toned emoji is one grapheme, two code points and four UTF-16 units, so an offset is wrong until the unit is named. Reading this schema and dry-running the call are free and need no wallet; a real call costs $0.003, paid in USDC on Base over x402.