Visa Trusted Agent Protocol Signature Inspector & Readiness

Visa's Trusted Agent Protocol lets an AI agent prove its identity and authorization directly to a merchant using HTTP Message Signatures (RFC 9421), aligned with Web Bot Auth. This tool parses a TAP signature, surfaces the agent-recognition signature and its replay-protection parameters (timestamp, session id, key id, algorithm), and scores TAP readiness.

⚠ TAP is recent (introduced ~Oct 2025; on Visa Developer + GitHub) and evolving. The RFC 9421 parsing is exact; TAP-specific labels (the three-signature model, the agent-recognition tag) are illustrative — verify against developer.visa.com. No signature is cryptographically verified here.

Visa TAP RFC 9421 · Web Bot Auth Zero PII Client-Side · No Network

Scope & reliance — 🔒 All inputs are processed locally in your browser. No data is transmitted. Do not enter real personal data — use synthetic or anonymised inputs only. Parsing and policy checks only; no cryptographic verification, no live call. Shares the RFC 9421 engine with T279. Deterministic · zero PII · CC BY 4.0.

▸ Inspect a TAP signature (RFC 9421)

Paste the Signature-Input and Signature headers from a TAP browsing or payment request. An example is pre-loaded.

Signature-Input Signature

▸ TAP readiness

Answer for your agent integration. TAP layers a scoped Visa tokenised credential over RFC 9421 agent recognition.