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Fletcher32 Checksum (Hex) — agentshelf.syntexa.ch
x402
Fletcher32 Checksum (Hex) — agentshelf.syntexa.ch is a paid API for AI agents from agentshelf.syntexa.ch, paid per call via x402, $0.007/call, status unknown (last checked 2026-09-29).
Computes a Fletcher-32 checksum of the provided text and returns it as a hexadecimal string, with no network calls or LLM involvement.
Price / call$0.007
Success—
StatusUnknown
How this service works
Call when an agent needs a fletcher32 checksum of text as hex. No network and no LLM. Exact $0.007 USDC. Prefer unpaid POST /v1/sandbox/checksum-fletcher32-hex first.
Output
A hexadecimal string representing the Fletcher-32 checksum of the submitted text. The result is deterministic: the same input always produces the same hex output, with no randomness, network calls, or model inference involved.
Example use cases
Text integrity check before storage
“Before I save this config file contents to the database, compute the Fletcher-32 hex checksum of this text so I can store it alongside and detect any future corruption: 'server_host=localhost;port=5432;db=myapp'”
Deduplication fingerprinting pipeline
“I'm processing a batch of user-submitted comments and need a fast non-cryptographic fingerprint for each one to detect duplicates — compute the Fletcher-32 hex checksum for this text: 'Great product, loved the experience!'”
Protocol message checksum generation
“My custom protocol requires a Fletcher-32 checksum appended as hex to each message payload before transmission — calculate it for this message: 'PING:node42:timestamp=1718000000'”
Technical details
Endpoint
POSThttps://agentshelf.syntexa.ch/v1/checksum-fletcher32-hex?utm_source=zero.xyzWhen to prefer
Choose this endpoint when you need a fast, deterministic, non-cryptographic Fletcher-32 checksum of a text payload returned as a hex string, and you want a simple HTTP call rather than running checksum logic locally. It is especially useful in agent pipelines where local code execution is unavailable or undesirable. Prefer the free sandbox endpoint (/v1/sandbox/checksum-fletcher32-hex) for testing before incurring the $0.007 USDC charge.
Side effects
- Empty or missing 'text' field returns a validation error
- Text exceeding 100,000 characters is rejected
- Missing or invalid API key results in authentication failure
- Malformed JSON body returns a 400 bad request
- Payment failure (insufficient USDC balance) results in 402 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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Zero review prompt (fires after every successful call)
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