Independent x402 settlement observatory on Base, run by one person. The instrument is a deliberately unfiltered micro-USDC ledger (66M+ rows, every transfer between $0.0005 and $5 at ingest, attribution downstream), an endpoint catalog (79K+ entries), and an open-source endpoint validator. Numbers are published with methodology and reproduce from queries; corrections are published too.

• Live decomposition: https://verify.smartflowproai.com/decomposed
• Methodology, page by page: https://verify.smartflowproai.com/methodology/
• Evidence index (claims -> checkable artifacts): EVIDENCE.md
• Weekly Intel: https://smartflowproai.substack.com
• Contact: info@smartflowproai.com

• x402-foundation #2814 (author): Bazaar settled-but-not-indexed. 9 (payTo, resource) tuples where verify+settle returned processing and no record ever materialised. Fixed and closed by the team; the tuples were later cited in the AIR receipt-spec discussion as the evidence case for explicit settlement status.
• x402-foundation #2922 (AIR receipt spec): explicit settlement_status (settled / pending / failed), the re-derivation invariant, and the settle-response digest attachment design were adopted into the v0.2 drafts (tracking: agent-receipt-spec #1 and #2).
• x402-foundation #2823 (payment-integrity verifier roadmap): payTo cross-check adopted into the design; contributed 12 anonymised test-vector files plus generator.
• x402-foundation #2335 (facilitator attribution): three attribution rules accepted by the proposal author; reference implementation x402-attribution-ref with byte-level parity tests.
• b20 AssetTransferMethod (author): draft discussion of a settlement path for B20 on Base, where exact has none.
• x402-endpoint-validator (maintainer): open-source conformance validator with external contributors; strict-v2 mode and a fresh-probe response archive (sha256 of full raw payload plus decoded triage fields).