diff --git a/benchmarks/network-coverage.yml b/benchmarks/network-coverage.yml
index e015946a..82dedfed 100644
--- a/benchmarks/network-coverage.yml
+++ b/benchmarks/network-coverage.yml
@@ -32,9 +32,9 @@ seo_intro: |
 abstract: |
   We benchmark how many networks each major onchain data provider lists
   in its public "supported networks" endpoint. The harness fetches the
-  official listing every six hours from five providers (GeckoTerminal,
-  Codex, Mobula, CoinPaprika and Dune via Sim API), deduplicates by
-  chain id and counts. Mainnet only,
+  official listing every six hours from six providers (GeckoTerminal,
+  Codex, Mobula, CoinPaprika, CoinStats and Dune via Sim API),
+  deduplicates by chain id and counts. Mainnet only,
   testnets are excluded because providers list them inconsistently and
   the comparison is meant to reflect what a builder can integrate against
   in production. Coverage breadth is one dimension of a data provider's
@@ -47,6 +47,7 @@ methodology:
   - "Codex: GraphQL `getNetworks` query at https://graph.codex.io/graphql with an official API key."
   - "Mobula: GET /api/1/blockchains with an Authorization API key."
   - "CoinPaprika: GET /v1/contracts (no auth). Lists platforms supported for contract lookup."
+  - "CoinStats: GET /wallet/blockchains with X-API-KEY."
   - "Dune (via Sim API): GET https://api.sim.dune.com/v1/evm/supported-chains (no auth). EVM only, mainnets filtered via the `mainnet` tag."
   - "Cadence: full refresh every 6 hours."
   - "Counting: a provider's network is counted once per unique chain id; mainnet only."
@@ -81,7 +82,7 @@ faq:
 
 # Real metrics exposed by the network-coverage harness:
 #   networks_supported_total{provider="geckoterminal"|"codex"|"mobula"|
-#                                     "coinpaprika"|"dune"}
+#                                     "coinpaprika"|"coinstats"|"dune"}
 #     -> gauge, the unique-chain count from the latest successful refresh.
 #   network_supported{provider, chain_id, slug, name} -> gauge (1 per
 #     network; useful for diff queries on the site if we add a
@@ -140,6 +141,19 @@ providers:
       sample_size: networks_supported_total{provider="coinpaprika"}
       series: networks_supported_total{provider="coinpaprika"}
 
+  - slug: coinstats
+    name: CoinStats
+    tag: Portfolio + market data
+    formula: "Count of blockchains returned by CoinStats's `/wallet/blockchains` endpoint, refreshed every 6 hours."
+    queries:
+      p50: networks_supported_total{provider="coinstats"}
+      p90: networks_supported_total{provider="coinstats"}
+      p99: networks_supported_total{provider="coinstats"}
+      mean: networks_supported_total{provider="coinstats"}
+      success: clamp_max(networks_supported_total{provider="coinstats"} > bool 0, 1)
+      sample_size: networks_supported_total{provider="coinstats"}
+      series: networks_supported_total{provider="coinstats"}
+
   - slug: dune
     name: Dune
     tag: Onchain analytics + Sim API
diff --git a/harnesses/network-coverage/cmd/script/coinstats.go b/harnesses/network-coverage/cmd/script/coinstats.go
new file mode 100644
index 00000000..344c6ee7
--- /dev/null
+++ b/harnesses/network-coverage/cmd/script/coinstats.go
@@ -0,0 +1,62 @@
+package main
+
+import (
+	"encoding/json"
+	"fmt"
+	"io"
+	"net/http"
+	"time"
+)
+
+const coinstatsBlockchainsURL = "https://openapiv1.coinstats.app/wallet/blockchains"
+
+// CoinStats /wallet/blockchains returns a flat JSON array of:
+//   {connectionId, name, icon, chain}
+// `connectionId` is the slug (e.g. "binancesmartchain"), `chain` is the
+// category enum (e.g. "binance_smart"), `name` is the human label.
+type coinstatsBlockchain struct {
+	ConnectionID string `json:"connectionId"`
+	Name         string `json:"name"`
+	Chain        string `json:"chain"`
+}
+
+func fetchCoinStats(cfg *Config) ProviderResult {
+	res := ProviderResult{Provider: "coinstats"}
+	if cfg.CoinStatsAPIKey == "" {
+		res.Err = "missing_api_key"
+		return res
+	}
+
+	client := &http.Client{Timeout: 15 * time.Second}
+	req, _ := http.NewRequest("GET", coinstatsBlockchainsURL, nil)
+	req.Header.Set("X-API-KEY", cfg.CoinStatsAPIKey)
+	req.Header.Set("Accept", "application/json")
+
+	resp, err := client.Do(req)
+	if err != nil {
+		res.Err = fmt.Sprintf("request_error: %v", err)
+		return res
+	}
+	defer resp.Body.Close()
+	body, _ := io.ReadAll(resp.Body)
+
+	if resp.StatusCode != 200 {
+		res.Err = fmt.Sprintf("status_%d", resp.StatusCode)
+		return res
+	}
+
+	var arr []coinstatsBlockchain
+	if err := json.Unmarshal(body, &arr); err != nil {
+		res.Err = fmt.Sprintf("parse_error: %v", err)
+		return res
+	}
+
+	for _, b := range arr {
+		res.Networks = append(res.Networks, Network{
+			ChainID: b.Chain,
+			Slug:    b.ConnectionID,
+			Name:    b.Name,
+		})
+	}
+	return res
+}
diff --git a/harnesses/network-coverage/cmd/script/config.go b/harnesses/network-coverage/cmd/script/config.go
index 1bbdc805..83d27ab8 100644
--- a/harnesses/network-coverage/cmd/script/config.go
+++ b/harnesses/network-coverage/cmd/script/config.go
@@ -12,6 +12,7 @@ type Config struct {
 	CodexAPIKey        string // official Codex Bearer (preferred — no mint, no proxy)
 	CodexSessionCookie string // fallback path: mint JWT from Defined.fi cookie
 	DefinedTokenURL    string // optional: pre-minted JWT sidecar
+	CoinStatsAPIKey    string
 	SimDuneAPIKey      string // optional — Sim's public endpoint works keyless, but a key avoids rate limits
 	HTTPProxy          string
 	RefreshInterval    time.Duration
@@ -24,6 +25,7 @@ func loadConfig() *Config {
 		CodexAPIKey:        os.Getenv("CODEX_API_KEY"),
 		CodexSessionCookie: os.Getenv("DEFINED_SESSION_COOKIE"),
 		DefinedTokenURL:    os.Getenv("DEFINED_TOKEN_SERVICE_URL"),
+		CoinStatsAPIKey:    os.Getenv("COINSTATS_API_KEY"),
 		SimDuneAPIKey:      os.Getenv("SIM_DUNE_API_KEY"),
 		HTTPProxy:          os.Getenv("HTTP_PROXY"),
 		RefreshInterval:    6 * time.Hour,
@@ -45,8 +47,8 @@ func loadConfig() *Config {
 	} else if c.CodexSessionCookie != "" {
 		codexAuth = "cookie+mint"
 	}
-	fmt.Printf("Config: refresh=%v, testnets=%v, mobula_key=%v, codex=%s, sim_dune_key=%v\n",
+	fmt.Printf("Config: refresh=%v, testnets=%v, mobula_key=%v, codex=%s, coinstats_key=%v, sim_dune_key=%v\n",
 		c.RefreshInterval, c.IncludeTestnets, c.MobulaAPIKey != "", codexAuth,
-		c.SimDuneAPIKey != "")
+		c.CoinStatsAPIKey != "", c.SimDuneAPIKey != "")
 	return c
 }
diff --git a/harnesses/network-coverage/cmd/script/main.go b/harnesses/network-coverage/cmd/script/main.go
index cb8f157c..b8c544c4 100644
--- a/harnesses/network-coverage/cmd/script/main.go
+++ b/harnesses/network-coverage/cmd/script/main.go
@@ -73,11 +73,7 @@ func fetchAll(cfg *Config) {
 		{"codex", fetchCodex},
 		{"coinpaprika", fetchCoinPaprika},
 		{"dune", fetchSimDune},
-		// coinstats dropped 2026-07-16: the free tier exhausts credits
-		// well below the harness cadence, so /wallet/blockchains returns
-		// HTTP 406 "Credits limit reached" on every fetch and never
-		// publishes a networks count. Re-add when a paid key is
-		// provisioned; the removed adapter is one revert away in git.
+		{"coinstats", fetchCoinStats},
 	}
 
 	var wg sync.WaitGroup