diff --git a/.github/workflows/idric-core.yml b/.github/workflows/idric-core.yml
index 70ef1da..b86c923 100644
--- a/.github/workflows/idric-core.yml
+++ b/.github/workflows/idric-core.yml
@@ -50,12 +50,14 @@ jobs:
       - name: Compile IB Idric smoke program
         run: |
           set -o pipefail
-          /tmp/idric/bin/idris2 src/Smoke.idric -o ib-smoke 2>&1 | tee /tmp/idric-compile.txt
+          cd src
+          /tmp/idric/bin/idris2 Smoke.idric -o ib-smoke 2>&1 | tee /tmp/idric-compile.txt
           test -x ./build/exec/ib-smoke
           ! grep -q '^Error:' /tmp/idric-compile.txt
 
       - name: Exercise browser-owned core
         run: |
+          cd src
           ./build/exec/ib-smoke | tee /tmp/ib-smoke.txt
           grep -Fx 'ingest=3' /tmp/ib-smoke.txt
           grep -Fx 'duplicate-url-count=2' /tmp/ib-smoke.txt
@@ -66,3 +68,6 @@ jobs:
           grep -Fx 'secret=secret' /tmp/ib-smoke.txt
           grep -Fx 'readable-files=2' /tmp/ib-smoke.txt
           grep -Fx 'canonical-files=2' /tmp/ib-smoke.txt
+          grep -Fx 'asin-key=asin:B000TEST' /tmp/ib-smoke.txt
+          grep -Fx 'price-minor-units=1799' /tmp/ib-smoke.txt
+          grep -Fx 'vector-match=p-book' /tmp/ib-smoke.txt
\ No newline at end of file
diff --git a/docs/product-price-index.md b/docs/product-price-index.md
new file mode 100644
index 0000000..2f6f8ba
--- /dev/null
+++ b/docs/product-price-index.md
@@ -0,0 +1,110 @@
+# Product, price, and vector index
+
+IB should treat products and prices as durable browser-owned data rather than as state owned by a merchant renderer.
+
+The merchant is a source, not the object model.
+
+## Product identity
+
+A product has an IB identity and zero or more external keys:
+
+- ISBN
+- UPC
+- GTIN
+- ASIN
+- source-specific keys
+
+An ASIN is therefore useful without making Amazon the canonical namespace.
+
+```text
+product p-0001
+key isbn:978...
+key asin:B0...
+term category-theory
+term paperback
+```
+
+`src/IB/Product.idric` contains the first typed representation.
+
+## Price observations
+
+Prices are observations, not properties of a product.
+
+```text
+observed 2026-08-23T13:42:00-04:00
+product p-0001
+source merchant-x
+currency USD
+minor_units 1799
+```
+
+Store money in integer minor units. A price observation belongs in canonical history only when its source permits durable storage.
+
+Provider data with a short legal or technical lifetime is a `CurrentOffer`, not a historical observation. It belongs in disposable cache and carries an expiry time.
+
+This distinction lets IB keep a real price history without pretending that every provider grants a license to archive its API responses.
+
+## Price retrieval
+
+For price data, prefer the ordinary web path over a restricted merchant API: ICU fetches the page and Grease handles the retrieval/extraction workflow. If the useful price value is easy to isolate, a small grep-like extraction is enough. If the page needs structured parsing, feed the ICU-fetched text to a small Idriç parser rather than moving browser policy into shell code.
+
+This rule is specifically about price data. Product metadata, identifiers, outbound links, and other provider integrations may use different adapters when appropriate.
+
+Fetched page bodies are not the durable price ledger. Reduce them to the minimal price fact needed by the core, then apply the existing storage boundary: a permitted durable fact becomes a `PriceObservation`; data that must remain short-lived stays a `CurrentOffer` in disposable cache.
+
+## Amazon
+
+Amazon is one provider.
+
+Do not make the IB price path depend on Amazon Creators API offer retention. For current Amazon prices, use the ICU + Grease retrieval path above and retain only the minimal parsed price fact according to the source's storage policy.
+
+Amazon identifiers such as ASINs remain useful durable product keys. An Amazon adapter can still provide non-price catalog metadata or outbound-link behavior without making Amazon the canonical product namespace.
+
+The Amazon adapter should eventually expose roughly:
+
+```text
+search(query) -> product candidates
+item(asin) -> current metadata
+outbound_link(asin, partner_tag) -> Amazon link
+```
+
+The core does not need to know how Amazon authentication works.
+
+Affiliate identity is distribution configuration, not product identity. A downstream build can supply its own partner tag or no tag. A distribution operated by one Associate can supply that Associate's tag where Amazon permits that distribution surface.
+
+## Vector index
+
+Vector search is a normal rebuildable index.
+
+Canonical product text and identifiers remain inspectable records. Embeddings derived from canonical data live under an index namespace, for example:
+
+```text
+state/
+  products/
+  prices/
+  indexes/
+    products/
+      <embedding-model>/
+        vectors
+        metadata
+```
+
+The intended scalar for this index is 32-bit `Float`. The Idriç compiler revision currently pinned by IB exposes `Double` but no primitive `Float`, so the first executable baseline uses `Double` inside the rebuildable index. This is deliberately not canonical state: when Idriç gains `Float`, the index can be rebuilt with 32-bit vectors without migrating product or price records.
+
+The baseline uses exact dot-product search. Normalize vectors before insertion when cosine-like ranking is desired. Exact scanning is intentionally simple and gives us a correct reference implementation. If corpus size makes it necessary, the same rebuildable index can later gain an ANN representation such as HNSW without changing canonical product records.
+
+Do not derive the persistent embedding corpus from provider content whose license forbids repurposing, analysis, or long-term storage. Vectorize IB-owned/canonical product text and independently usable metadata instead.
+
+## Browser integration
+
+This follows the existing IB storage rule: canonical state is separate from rebuildable indexes and disposable caches.
+
+A visit to a product page can therefore connect:
+
+```text
+visit -> URL -> product identity -> current offers
+                         |-> durable permitted price observations
+                         |-> rebuildable semantic vector
+```
+
+The UI can show a current Amazon price next to a book, tool, replacement part, or other object without making Amazon the place where the user must buy it.
\ No newline at end of file
diff --git a/src/IB/Product.idric b/src/IB/Product.idric
new file mode 100644
index 0000000..cf4c7cb
--- /dev/null
+++ b/src/IB/Product.idric
@@ -0,0 +1,84 @@
+module IB.Product
+
+%default total
+
+public export
+data ProductKey
+  = ISBN String
+  | UPC String
+  | GTIN String
+  | ASIN String
+  | SourceKey String String
+
+public export
+key_text : ProductKey → String
+key_text (ISBN value) = "isbn:" ++ value
+key_text (UPC value) = "upc:" ++ value
+key_text (GTIN value) = "gtin:" ++ value
+key_text (ASIN value) = "asin:" ++ value
+key_text (SourceKey source value) = source ++ ":" ++ value
+
+public export
+data Product = Item String (List ProductKey) (List String)
+
+public export
+product_id : Product → String
+product_id (Item value _ _) = value
+
+public export
+product_keys : Product → List ProductKey
+product_keys (Item _ keys _) = keys
+
+public export
+product_terms : Product → List String
+product_terms (Item _ _ terms) = terms
+
+public export
+data PriceObservation = Observed String String Nat String String
+
+public export
+price_source : PriceObservation → String
+price_source (Observed source _ _ _ _) = source
+
+public export
+price_product : PriceObservation → String
+price_product (Observed _ product _ _ _) = product
+
+public export
+price_minor_units : PriceObservation → Nat
+price_minor_units (Observed _ _ amount _ _) = amount
+
+public export
+price_currency : PriceObservation → String
+price_currency (Observed _ _ _ currency _) = currency
+
+public export
+price_observed_at : PriceObservation → String
+price_observed_at (Observed _ _ _ _ observed_at) = observed_at
+
+public export
+data CurrentOffer = Offer String ProductKey Nat String String String
+
+public export
+offer_source : CurrentOffer → String
+offer_source (Offer source _ _ _ _ _) = source
+
+public export
+offer_key : CurrentOffer → ProductKey
+offer_key (Offer _ key _ _ _ _) = key
+
+public export
+offer_minor_units : CurrentOffer → Nat
+offer_minor_units (Offer _ _ amount _ _ _) = amount
+
+public export
+offer_currency : CurrentOffer → String
+offer_currency (Offer _ _ _ currency _ _) = currency
+
+public export
+offer_observed_at : CurrentOffer → String
+offer_observed_at (Offer _ _ _ _ observed_at _) = observed_at
+
+public export
+offer_expires_at : CurrentOffer → String
+offer_expires_at (Offer _ _ _ _ _ expires_at) = expires_at
diff --git a/src/IB/VectorIndex.idric b/src/IB/VectorIndex.idric
new file mode 100644
index 0000000..5da622f
--- /dev/null
+++ b/src/IB/VectorIndex.idric
@@ -0,0 +1,42 @@
+module IB.VectorIndex
+
+%default total
+
+-- The pinned Idriç compiler does not yet expose a primitive 32-bit Float.
+-- This index is rebuildable, so using Double here does not affect canonical
+-- browser state and can be replaced by Float without a state migration.
+public export
+data VectorRow = Row String (List Double)
+
+public export
+vector_id : VectorRow → String
+vector_id (Row value _) = value
+
+public export
+vector_values : VectorRow → List Double
+vector_values (Row _ values) = values
+
+public export
+dot : List Double → List Double → Double
+dot [] _ = 0.0
+dot _ [] = 0.0
+dot (left :: more_left) (right :: more_right) =
+  left * right + dot more_left more_right
+
+public export
+score : List Double → VectorRow → Double
+score query row = dot query (vector_values row)
+
+public export
+best_match : List Double → List VectorRow → Maybe (String, Double)
+best_match query [] = Nothing
+best_match query (first :: rest) =
+  go first (score query first) rest
+  where
+    go : VectorRow → Double → List VectorRow → Maybe (String, Double)
+    go best best_score [] = Just (vector_id best, best_score)
+    go best best_score (candidate :: more) =
+      let candidate_score = score query candidate in
+        if candidate_score > best_score
+          then go candidate candidate_score more
+          else go best best_score more
\ No newline at end of file
diff --git a/src/Smoke.idric b/src/Smoke.idric
index fdb5e4e..3c07578 100644
--- a/src/Smoke.idric
+++ b/src/Smoke.idric
@@ -4,6 +4,8 @@ import IB.History
 import IB.Index
 import IB.Storage
 import IB.Inspect
+import IB.Product
+import IB.VectorIndex
 
 %default total
 
@@ -15,14 +17,26 @@ sample_entries = [
   Entry "https://missing-time.test/c" Nothing Nothing raw_urls visit Nothing 93
   ]
 
+sample_vectors : List VectorRow
+sample_vectors = [
+  Row "p-book" [1.0, 0.0, 0.0],
+  Row "p-tool" [0.0, 1.0, 0.0],
+  Row "p-part" [0.0, 0.0, 1.0]
+  ]
+
 first_or : Nat → List Nat → Nat
 first_or fallback [] = fallback
 first_or fallback (value :: _) = value
 
+match_id : Maybe (String, Double) → String
+match_id Nothing = "none"
+match_id (Just (value, _)) = value
+
 main : IO ()
 main = do
   let raw = ingest_raw_lines ["# ignored", " https://example.test/a ", "https://example.test/a", "https://other.test/b"]
   let indices = build_indices sample_entries
+  let price = Observed "permitted-history-source" "p-book" 1799 "USD" "2026-08-23T13:42:00-04:00"
   let files = [
         FileRow "visits.jsonl" 20 regular_file,
         FileRow "indexes/summary.json" 10 regular_file,
@@ -39,3 +53,6 @@ main = do
   putStrLn ("secret=" ++ storage_kind_text (classify_path "renderer/passwords"))
   putStrLn ("readable-files=" ++ show (readable_file_count files))
   putStrLn ("canonical-files=" ++ show (files_of_kind canonical files))
+  putStrLn ("asin-key=" ++ key_text (ASIN "B000TEST"))
+  putStrLn ("price-minor-units=" ++ show (price_minor_units price))
+  putStrLn ("vector-match=" ++ match_id (best_match [0.9, 0.1, 0.0] sample_vectors))
\ No newline at end of file