v4.0.0

Removed (BREAKING)

The v1-era public exports are gone, completing the 3.9.0 deprecation. The payment engine is unchanged — payAndFetch (client) and x402Middleware (server) have been the canonical paths since 3.x and cover everything the removed helpers did.

• client: createX402Client, wrapFetch (and the X402Client, X402ClientConfig, WrapFetchOptions types). → payAndFetch(url, init, wallets).
• server: x402AccessPass, x402BrowserSupport, escapeHtml. → x402Middleware.
• server: createDynamicPricing, formatPricing. → compute the price per request in your handler and pass it to x402Middleware.
• server: the entire token/model pricing surface — createTokenPricing, countTokens, getAvailableModels, isValidModel, formatTokenPricing, MODEL_PRICING, MODEL_REGISTRY, MODEL_PRICING_MAP, getModel, findModel, isValidModelId, getAvailableModelIds, getModelsByTier, getModelsByFamily, getActiveModels, getTextModels, getCheapestModel, estimateCost, formatModelPricing (and their types). This wrapped a hardcoded January-2026 OpenAI snapshot that goes stale fast; price requests with your model provider's live API and pass the amount to x402Middleware.
• server: stripePayTo. → a PayToProvider map on x402Middleware. (getStripeProviderNetwork stays internal.)
• react: useAccessPass. → useX402Payment.

Notes

• EVM one-shot pay-per-call is unchanged. payAndFetch remains the live EVM path until Tabs reaches EVM. The createX402Client / wrapFetch implementations are retained internally — they still power payAndFetch, the v2 strategy, and useX402Payment; only their public exports were removed.
• To stay on the old surface, pin @dexterai/x402@^3.