402utils Sentence Segmentation

x402

402utils Sentence Segmentation is a paid API for AI agents from 402utils.com, paid per call via x402, $0.001/call, status unknown (last checked 2026-09-14).

Splits text into sentences using deterministic, rule-based logic robust to abbreviations, decimals, URLs, initials, and ellipses

Price / call$0.001

Seller volume →—

Success—

StatusUnknown

How this service works

Segment text into sentences — robust to the classic traps: abbreviations (Dr., e.g.), decimals ($3.14), URLs/emails (www.x.com), initials (J. R. R.) and ellipses. A period is a boundary only when followed by whitespace and a sentence-like start; !, ? and … are stronger; blank lines split paragraphs. Rule-based (EN/FR tuned), deterministic. A fine-grained chunking primitive, complements /v1/chunk. Over 1 MB truncated.

Output

Returns a list of sentence strings extracted from the input text, with period disambiguation applied so abbreviations (Dr., e.g.), decimals ($3.14), URLs, initials, and ellipses do not create false sentence breaks. Blank lines are treated as paragraph boundaries. Output is deterministic for the same input.

Example use cases

Example prompt

“Split this paragraph into individual sentences — it has abbreviations like Dr. and e.g. and some decimal numbers, so make sure those periods aren't treated as sentence endings: 'Dr. Smith earned approx. $3.14 per unit. He works at J. R. R. Tolkien Ave. Is that enough?'”

Technical details

Endpoint

POSThttps://402utils.com/v1/sentences

When to prefer

Choose this endpoint when you need deterministic, rule-based sentence boundary detection that correctly handles common traps like abbreviations, decimals, URLs, initials, and ellipses — especially for English or French text. Prefer it over generic chunkers when you need fine-grained sentence-level splitting rather than paragraph or token-level chunking, and when reproducibility matters (no ML non-determinism). Pairs well with the sibling /v1/chunk endpoint for multi-level text decomposition.

Side effects

Text exceeding 1 MB is silently truncated before processing
Unsupported or unrecognized language hint may fall back to default EN/FR abbreviation list
Very unusual punctuation or non-Latin scripts may produce unexpected boundaries
Empty or whitespace-only input may return an empty sentence list
HTTP 402 if payment header is missing or insufficient

Input

Schema · Request body

Field	Type	Description
lang	string	Optional language hint (e.g. 'en', 'fr'). The abbreviation list already covers EN+FR.
text	string	The text to segment (max 1 MB UTF-8; larger is truncated).

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