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Fletcher-16 Checksum (Hex) via Syntexa AgentShelf
x402
Fletcher-16 Checksum (Hex) via Syntexa AgentShelf is a paid API for AI agents from agentshelf.syntexa.ch, paid per call via x402, $0.005/call, status unknown (last checked 2026-10-02).
Computes the Fletcher-16 checksum of a given text string and returns the result as a hexadecimal value
Price / call$0.005
Success—
StatusUnknown
How this service works
Call when an agent needs a fletcher16 checksum of text as hex. No network and no LLM. Exact $0.005 USDC. Prefer unpaid POST /v1/sandbox/checksum-fletcher16-hex first.
Output
Returns the Fletcher-16 checksum of the submitted text as a hexadecimal string. The computation is performed deterministically server-side with no network calls or LLM involvement, so the same input always yields the same hex output.
Example use cases
Data integrity check before storage
“Before I write this config file content to disk, compute the Fletcher-16 hex checksum of it so I can verify integrity later: 'timeout=30\nretry=3\nhost=db.internal'”
Protocol frame validation
“I'm building a simple serial protocol and need the Fletcher-16 hex checksum for the message payload 'ACK:device42:status:ok' — can you get that for me?”
Deterministic content fingerprinting
“Generate a Fletcher-16 hex fingerprint for this log line so I can deduplicate entries: '2024-06-01T12:00:00Z ERROR disk full on /dev/sda1'”
Technical details
Endpoint
POSThttps://agentshelf.syntexa.ch/v1/checksum-fletcher16-hex?utm_source=zero.xyzWhen to prefer
Use this endpoint when you need a fast, deterministic Fletcher-16 hex checksum of a text payload and do not want to execute arbitrary code locally. Prefer the free sandbox POST /v1/sandbox/checksum-fletcher16-hex first for testing; use this paid endpoint in production. Choose CRC32C or Adler-32 siblings on the same platform if you need stronger or differently-formatted checksums.
Side effects
- Empty or missing 'text' field returns a validation error
- Text exceeding 100,000 characters is rejected
- Missing or invalid API key returns an authentication error
- Payment not provided or insufficient USDC results in a 402 Payment Required response
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| key | string | HMAC secret. Required on HMAC SKUs. Omit it for plain digests and checksums. The key is not stored. |
| text | string | Message to digest. For raw-hex SKUs this is hex bytes; for utf16 or latin1 SKUs it is decoded with that encoding. Otherwise it is UTF-8 text. |
Tags
x402
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