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Agent Rest Stop – SizeCap (Document Byte-Cap Fitter)
x402
Agent Rest Stop – SizeCap (Document Byte-Cap Fitter) is a paid API for AI agents from agent-gas-station.agent-gas-station.workers.dev, paid per call via x402, $0.01/call, status unknown (last checked 2026-11-02).
Truncates or fits a document to a specified maximum byte size, returning a compacted version that does not exceed the byte cap.
Price / call$0.01
Success—
StatusUnknown
How this service works
Fits a document under a byte cap.
Output
A version of the input document that has been truncated or fitted to not exceed the specified max_bytes limit, returned as a string.
Example use cases
Fitting text into LLM context window
“I need to pass this long document to another AI model but it can only handle 2048 bytes — can you cut it down to fit under that limit without going over?”
Capping API payload size
“This user-generated comment is too big to send to the downstream API that has a 512-byte payload limit — trim it to fit under 512 bytes please.”
Truncating stored notes to size budget
“I need to archive this note but my storage slot only allows 1024 bytes — fit the document under that byte cap before I store it.”
Technical details
Endpoint
POSThttps://agent-gas-station.agent-gas-station.workers.dev/v1/SizeCap?utm_source=zero.xyzWhen to prefer
Choose this endpoint when you need a simple, deterministic byte-cap on a document — especially in agentic pipelines where downstream services or LLM context windows have hard byte limits. It is distinct from general text summarization or compression: it enforces a strict byte ceiling rather than semantically condensing content.
Side effects
- max_bytes value is not a valid number string, causing a parse error
- doc is empty or null, resulting in an empty or error response
- max_bytes is smaller than minimum viable content, returning nearly empty output
- Very large documents may hit request size limits before being processed
- Payment failure ($0.01 USDC) if x402 payment header is missing or invalid
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| doc | string | |
| max_bytes | string |
Tags
x402
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