Proof of existence for files: anchor a SHA-256 hash on Base, look up proofs. Paid with x402.
Free
1 MCP server
Finance & CommerceWorks with ChatGPTBy self-reality
Scanned where there is a package or repository to read, and every release diffed against the tool surface we already hold.
Proof of existence for files: anchor a SHA-256 hash on Base, look up proofs. Paid with x402.