"Hardening x402: PII Filter Corpus, Sweep Results, and Live Ecosystem Data"

"This dataset supports reproducible evaluation of PII detection middleware for x402 agentic HTTP payment protocols. It contains four components: (1) a synthetic corpus of 2,000 labelled x402 payment metadata triples spanning seven API categories and six PII entity types (PERSON, EMAIL_ADDRESS, US_SSN, IBAN_CODE, CREDIT_CARD, PHONE_NUMBER), with 720 PII-positive and 1,280 PII-negative records; (2) results of a 42-configuration parameter sweep over the presidio-hardened-x402 middleware (micro-F1, precision, recall, p99 latency); (3) live HTTP probe records from 19 deployed x402 endpoints characterising real-world PII exposure patterns; and (4) Dune Analytics SQL queries and exports characterising the deployed x402 ecosystem across 11 blockchains and 96 facilitator wallets. Have fun exploring!"