VIN check API free

Client

Searches for free VIN check API often want programmatic access. Toolcore exposes URL prefill (q/qb) and agent manifests—not a server-side JSON transform API. The browser runs mod-11 when the link opens.

Manifest vs private API

Toolcore's agent integration pattern links to HTTPS tool pages with encoded input. VIN mod-11 executes in the visitor browser—saving agent compute while keeping the contract machine-readable.

Privacy: parsing runs only in your browser. This page does not query DMV, insurance, or manufacturer databases—only the published mod-11 rule for the ninth character.
?

After removing spaces and hyphens, the frame must be exactly 17 characters. Letters I, O, and Q are forbidden everywhere. Position 9 (index 8) is the check symbol: decimal 0–9 or X for remainder ten. Each symbol maps to a numeric value, is multiplied by a fixed weight for its position, products are summed, and sum mod 11 must equal the check symbol’s value (X → 10).

Result

Passes check digit — weighted sum mod 11 is 10; expected X.

  • WMI (positions 1–3): 1HG
  • Attributes (4–8): BH41J
  • Check (9): X
  • Model year code (10): M
  • Plant (11): N
  • Sequential (12–17): 109186

Common use cases

  • Agents offloading checksum work to a prefilled browser tab.
  • Automation that opens human-verifiable links instead of redoing mod-11 in LLM context.
  • Integrators reading agent-tools.json for prefill conventions.

Common mistakes to avoid

  • Expecting POST /api/vin/check JSON response

    Deterministic server ops are limited—VIN checksum runs client-side via page URL.

  • Embedding secrets in shareable prefill URLs

    Prefill is for non-sensitive VIN strings—avoid production tokens in query params.

FAQ

Is there a free VIN API?

Use URL prefill plus browser execution per agent-tools.json—not a generic upload API.

Where is the manifest?

See /agent-tools.json and /llm-prompt.txt on Toolcore.

Common search terms

Phrases people search for that match this tool. See the full long-tail keyword index.

  • vin check digit verifier online
  • validate vin number mod 11 free
  • ninth position vin checksum browser
  • iso 3779 vin check digit calculator
  • vehicle identification number check digit locally

More tools

Related utilities you can open in another tab—mostly client-side.