{"schema_version":"1.0","name":"AI Data Archive","description":"Machine-readable archive of open-licensed scholarly literature (Europe PMC, OpenAlex), normalized to structured JSON with full license/attribution metadata. Discovery and search are free; document content is paid per request via the x402 HTTP payment protocol (USDC).","type":"machine-readable-data-archive","url":"https://api.ishob.com","access":{"metadata":"free","catalog":"free","search":"free","content":"paid"},"payment_protocol":"x402","payment":{"protocol":"x402","x402_version":2,"scheme":"exact","network":"eip155:8453","network_name":"Base","asset":"USDC","pay_to":"0x906F87F107B4675dD890b3f8EB2d51885E50e09d","facilitator":"https://facilitator.payai.network","status":"active","flow":["GET a paid endpoint without payment -> HTTP 402 with PAYMENT-REQUIRED header (base64 JSON payment requirements)","Sign an x402 payment for one of the `accepts` requirements","Repeat the GET with the PAYMENT-SIGNATURE header","On success: HTTP 200 with content and PAYMENT-RESPONSE header (settlement receipt)","Requests for missing documents return 404 before any payment is requested; failed handlers are never charged"],"specification":"https://github.com/x402-foundation/x402"},"pricing":{"currency":"USD (settled in USDC)","document_metadata":"0.001","document_fulltext":"0.01","document_references":"0.002","topic_bundle":"0.5"},"api":{"base":"https://api.ishob.com/api","catalog":"/api/catalog","topics":"/api/topics","search":"/api/search","document":"/api/document/{id}","fulltext":"/api/document/{id}/fulltext","references":"/api/document/{id}/references","topic_content":"/api/topic/{slug}/content","stats":"/api/stats","openapi":"/openapi.json"},"formats":["application/json","application/x-ndjson"],"data_sources":["Europe PMC (https://europepmc.org)","OpenAlex (https://openalex.org)"],"licenses_included":["CC0-1.0","PDM-1.0","CC-BY (all versions)","CC-BY-SA (all versions)"],"crawl_policy":"Free endpoints may be crawled; please respect HTTP 429 Retry-After.","contact":null}