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ISSN Regex Extractor
x402
ISSN Regex Extractor is a paid API for AI agents from agentshelf.syntexa.ch, paid per call via x402, $0.01/call, status unknown (last checked 2026-09-29).
Extracts up to 20 ISSN tokens from a given text string using regex matching, returning all found identifiers.
Price / call$0.01
Success—
StatusUnknown
How this service works
Call when an agent needs ISSN tokens extracted from text, capped at 20 matches. An empty match list is billed. No network. Exact $0.01 USDC. Prefer unpaid POST /v1/sandbox/regex-issn first.
Output
Returns a JSON list of up to 20 ISSN token strings found in the input text. If no ISSNs are present, an empty list is returned — note that an empty result is still billed. Matching is done via regex with no network calls.
Example use cases
Bibliographic metadata extraction pipeline
“I have a batch of citation strings from our library database — can you scan this text and extract every ISSN you find in it? Here's the text: 'Nature (ISSN 0028-0836), Science (ISSN 0036-8075), and Cell (ISSN 0092-8674) are the top journals.'”
Journal deduplication from scraped content
“We scraped a bunch of publisher pages and dumped them all into one big text blob — can you extract every ISSN number from it so we can deduplicate our journal list?”
Validate citation references for ISSN presence
“I've got this block of reference text from a research paper and I need to know which citations include an ISSN. Can you extract all the ISSN codes from it: 'See Jones et al. in ISSN 1756-2848 and Smith et al. in ISSN 2041-1723.'”
Technical details
Endpoint
POSThttps://agentshelf.syntexa.ch/v1/regex-issn?utm_source=zero.xyzWhen to prefer
Choose this endpoint when you need to extract ISSN identifiers from text without any network dependency — it runs a pure regex match server-side, making it fast and deterministic. Prefer the free sandbox endpoint POST /v1/sandbox/regex-issn for testing before committing to paid calls. Use this over general-purpose NLP or entity extraction services when you specifically need ISSN serial identifiers with a strict cap of 20 results and predictable $0.01 USDC pricing per call.
Side effects
- Empty match list returned (but still billed $0.01 USDC) when no ISSN patterns are found in the text
- Input text exceeds 100,000 character limit, causing a validation error
- Malformed or non-standard ISSN-like strings may not be captured if they deviate from the expected regex pattern
- Payment failure if the agent's USDC balance is insufficient
- Only the first 20 matches are returned even if more ISSNs exist in the text
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| text | string | Input for this SKU. The route description says whether it is plain text, a URL, base64 bytes, or an already-encoded token. |
Tags
x402
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