# FixLedger - Full Machine Discovery & AEO Catalog Index (llms-full.txt) > Summary: FixLedger is a stateless Streamable HTTP MCP and x402 (Base USDC) failure-recovery oracle indexing 37 Docker-verified compiler/SDK fixes and 6 post-cutoff breaking-change deltas across 11 ecosystems. > Economics: Free <50ms Peek-Before-Pay ($0.00). Pay-on-Proof unlocks cost $0.005 (fix), $0.003 (delta), or $0.002 (pulse) and save ~17,500 LLM retry tokens (~36x ROI). Zero charge on MISS or 404. ## 1. Machine Endpoints & Protocol Wiring - Streamable HTTP MCP Endpoint: POST https://fixledger-iota.vercel.app/api/mcp - MCP Capability Card: GET https://fixledger-iota.vercel.app/.well-known/mcp.json - x402 Bazaar & Circle Discovery Manifest: GET https://fixledger-iota.vercel.app/.well-known/x402 - Free Error Peek ($0.00): POST https://fixledger-iota.vercel.app/api/x402/peek - Paid Fix Unlock ($0.005 HTTP 402): GET https://fixledger-iota.vercel.app/api/x402/unlock?id={resolution_id_or_slug} - Free Delta Topic Index ($0.00): GET https://fixledger-iota.vercel.app/api/x402/delta - Paid Delta Unlock ($0.003 HTTP 402): GET https://fixledger-iota.vercel.app/api/x402/delta?topic={topic_key} - Upstream Swarm & Statuspage Pulse ($0.002 HTTP 402 / $0.00 on active outage): GET https://fixledger-iota.vercel.app/api/x402/pulse?domain={hostname} - Claim 3-Unlock Starter Trial Key ($0.00): POST https://fixledger-iota.vercel.app/api/keys/trial - Live Network Telemetry: GET https://fixledger-iota.vercel.app/api/telemetry ## 2. Payment Headers (Multi-Rail) - Rail 1 (Autonomous x402 Base USDC): Send base64 EIP-3009 transferWithAuthorization payload in `X-PAYMENT` (v1) or `PAYMENT-SIGNATURE` (v2), or `_meta.x402Payment` inside MCP `tools/call` arguments. - Rail 2 (Prepaid Credit Key): Send `Authorization: Bearer fl_live_...` or `fl_trial_...`. ## 3. MCP JSON-RPC Quickstart Example ```json { "jsonrpc": "2.0", "id": 1, "method": "tools/call", "params": { "name": "diagnose_peek", "arguments": { "error_text": "Error: Route /api/checkout used headers(). headers() should be awaited before using its value.", "ecosystem": "nextjs" } } } ``` ## 4. Indexed Post-Cutoff Breaking Deltas ($0.003 Unlock) - `llm-models:active-2026` [active_models] ($0.003): Active vs. retired model IDs, reasoning parameter rules, tool-calling flags, and token pricing across OpenAI, Anthropic, and Google Gemini. -> Unlock: https://fixledger-iota.vercel.app/api/x402/delta?topic=llm-models%3Aactive-2026 - `x402:eip3009-base-spec` [protocol_spec] ($0.003): Exact HTTP 402 v1 & v2 challenge headers, Base Mainnet & Sepolia USDC EIP-712 domain parameters, and facilitator /verify + /settle schema. -> Unlock: https://fixledger-iota.vercel.app/api/x402/delta?topic=x402%3Aeip3009-base-spec - `tailwindcss:v3-to-v4` [sdk_migration] ($0.003): Surgical Tailwind CSS v3 -> v4 delta: @tailwindcss/postcss setup, @import 'tailwindcss', @theme, @utility, @reference, and renamed utilities. -> Unlock: https://fixledger-iota.vercel.app/api/x402/delta?topic=tailwindcss%3Av3-to-v4 - `mcp:sse-to-streamable-http` [protocol_spec] ($0.003): Model Context Protocol 2025-03-26 Streamable HTTP migration: single /mcp endpoint, stateless serverless mode, and HTTP 202 notification handling. -> Unlock: https://fixledger-iota.vercel.app/api/x402/delta?topic=mcp%3Asse-to-streamable-http - `nextjs:v14-to-v15-async-apis` [sdk_migration] ($0.003): Next.js 15+ breaking changes: async cookies/headers/params, uncached fetch default, React 19 useActionState, and unstable_rethrow. -> Unlock: https://fixledger-iota.vercel.app/api/x402/delta?topic=nextjs%3Av14-to-v15-async-apis - `google-genai:legacy-to-unified-sdk` [sdk_migration] ($0.003): Migration from retired @google/generative-ai to unified @google/genai TypeScript & Python SDKs. -> Unlock: https://fixledger-iota.vercel.app/api/x402/delta?topic=google-genai%3Alegacy-to-unified-sdk ## 5. Indexed Docker-Verified Error Signatures ($0.00 Peek / $0.005 Surgical Diff Unlock) Note: Only public signature metadata is listed below. Root-cause diagnostics and verified diffs (<350 tokens) unlock via `/api/x402/unlock?id=` or MCP `unlock_verified_fix`. ### [x402] x402 Base USDC EIP-3009 EIP-712 Domain Name & Version Mismatch - Slug / ID: `x402-eip3009-base-usdc-domain-version-mismatch` (`11111111-1111-4111-8111-111111111101`) - Package & Semver: `x402` (`>=0.2.0`, runtime: `any`) - Canonical Error Signature: `Error: x402 facilitator HTTP 400: EIP-3009 transferWithAuthorization invalid signature or domain mismatch on eip155:8453` - Verification & ROI: 64 verified passes (sandbox_docker_exit_0), saves ~24,500 tokens for $0.005 - Preview Page: https://fixledger-iota.vercel.app/fixes/x402-eip3009-base-usdc-domain-version-mismatch - x402 Unlock URL: https://fixledger-iota.vercel.app/api/x402/unlock?id=x402-eip3009-base-usdc-domain-version-mismatch ### [x402] EIP-3009 transferWithAuthorization bytes32 Nonce Size Rejection in viem - Slug / ID: `x402-eip3009-nonce-not-bytes32-hex` (`11111111-1111-4111-8111-a10000000002`) - Package & Semver: `viem` (`>=2.0.0`, runtime: `any`) - Canonical Error Signature: `AbiEncodingBytesSizeMismatchError: Size of bytes "0x1" (bytes1) does not match expected size (bytes32) in transferWithAuthorization` - Verification & ROI: 53 verified passes (sandbox_docker_exit_0), saves ~19,200 tokens for $0.005 - Preview Page: https://fixledger-iota.vercel.app/fixes/x402-eip3009-nonce-not-bytes32-hex - x402 Unlock URL: https://fixledger-iota.vercel.app/api/x402/unlock?id=x402-eip3009-nonce-not-bytes32-hex ### [x402] USDC 6-Decimal Atomic Units vs 18-Decimal parseEther Overflow - Slug / ID: `x402-usdc-6-decimals-parseether-overpayment` (`11111111-1111-4111-8111-a10000000003`) - Package & Semver: `viem` (`>=2.0.0`, runtime: `any`) - Canonical Error Signature: `Error: FiatTokenV2: transfer amount exceeds balance in x402 transferWithAuthorization when paying $0.005 USDC` - Verification & ROI: 82 verified passes (sandbox_docker_exit_0), saves ~14,800 tokens for $0.005 - Preview Page: https://fixledger-iota.vercel.app/fixes/x402-usdc-6-decimals-parseether-overpayment - x402 Unlock URL: https://fixledger-iota.vercel.app/api/x402/unlock?id=x402-usdc-6-decimals-parseether-overpayment ### [x402] Browser Fetch Strips x402 Headers Without Access-Control-Expose-Headers - Slug / ID: `x402-cors-expose-headers-payment-required-missing` (`11111111-1111-4111-8111-a10000000004`) - Package & Semver: `x402` (`>=0.3.0`, runtime: `browser`) - Canonical Error Signature: `Error: x402-fetch received HTTP 402 from cross-origin endpoint but PAYMENT-REQUIRED and X-PAYMENT-RESPONSE headers are null` - Verification & ROI: 47 verified passes (sandbox_docker_exit_0), saves ~17,600 tokens for $0.005 - Preview Page: https://fixledger-iota.vercel.app/fixes/x402-cors-expose-headers-payment-required-missing - x402 Unlock URL: https://fixledger-iota.vercel.app/api/x402/unlock?id=x402-cors-expose-headers-payment-required-missing ### [x402] Base L2 Sequencer Clock Skew Rejection on Tight validAfter / validBefore Windows - Slug / ID: `x402-validbefore-clock-skew-block-timestamp` (`11111111-1111-4111-8111-a10000000005`) - Package & Semver: `x402` (`>=0.2.0`, runtime: `any`) - Canonical Error Signature: `Error: FiatTokenV2: authorization is not yet valid or authorization is expired during Base L2 sequencer settlement` - Verification & ROI: 39 verified passes (sandbox_docker_exit_0), saves ~18,400 tokens for $0.005 - Preview Page: https://fixledger-iota.vercel.app/fixes/x402-validbefore-clock-skew-block-timestamp - x402 Unlock URL: https://fixledger-iota.vercel.app/api/x402/unlock?id=x402-validbefore-clock-skew-block-timestamp ### [x402] viem WalletClient ChainMismatchError Between Base Sepolia (84532) and Base Mainnet (8453) - Slug / ID: `viem-chain-mismatch-base-sepolia-vs-mainnet` (`11111111-1111-4111-8111-a10000000006`) - Package & Semver: `viem` (`>=2.0.0`, runtime: `nodejs`) - Canonical Error Signature: `ChainMismatchError: The current chain of the wallet (id: 84532) does not match the target chain for the transaction (id: 8453 - Base)` - Verification & ROI: 58 verified passes (sandbox_docker_exit_0), saves ~13,500 tokens for $0.005 - Preview Page: https://fixledger-iota.vercel.app/fixes/viem-chain-mismatch-base-sepolia-vs-mainnet - x402 Unlock URL: https://fixledger-iota.vercel.app/api/x402/unlock?id=viem-chain-mismatch-base-sepolia-vs-mainnet ### [x402] x402-fetch Per-Request maxValue Cap Blocking Multi-Cent Endpoints - Slug / ID: `x402-fetch-max-amount-guardrail-exceeded` (`11111111-1111-4111-8111-a10000000007`) - Package & Semver: `x402-fetch` (`>=0.2.0`, runtime: `any`) - Canonical Error Signature: `Error: Payment amount 50000 exceeds maximum allowed per-request budget 10000 in wrapFetchWithPayment` - Verification & ROI: 44 verified passes (sandbox_docker_exit_0), saves ~15,200 tokens for $0.005 - Preview Page: https://fixledger-iota.vercel.app/fixes/x402-fetch-max-amount-guardrail-exceeded - x402 Unlock URL: https://fixledger-iota.vercel.app/api/x402/unlock?id=x402-fetch-max-amount-guardrail-exceeded ### [x402] Base Public RPC HTTP 429 Rate Limit Under Swarm Concurrency (viem fallback transport) - Slug / ID: `base-public-rpc-429-rate-limit-fallback-transport` (`11111111-1111-4111-8111-a10000000008`) - Package & Semver: `viem` (`>=2.0.0`, runtime: `any`) - Canonical Error Signature: `HttpRequestError: HTTP request failed. Status: 429 URL: https://mainnet.base.org Details: Too Many Requests` - Verification & ROI: 71 verified passes (sandbox_docker_exit_0), saves ~16,100 tokens for $0.005 - Preview Page: https://fixledger-iota.vercel.app/fixes/base-public-rpc-429-rate-limit-fallback-transport - x402 Unlock URL: https://fixledger-iota.vercel.app/api/x402/unlock?id=base-public-rpc-429-rate-limit-fallback-transport ### [mcp] MCP Streamable HTTP Session Loss Across Stateless Serverless Invocations - Slug / ID: `mcp-streamable-http-serverless-stateless-session` (`11111111-1111-4111-8111-111111111102`) - Package & Semver: `@modelcontextprotocol/sdk` (`>=1.8.0`, runtime: `vercel-serverless`) - Canonical Error Signature: `Error: StreamableHTTPServerTransport session not found or SSE connection terminated prematurely on serverless function` - Verification & ROI: 51 verified passes (sandbox_docker_exit_0), saves ~21,000 tokens for $0.005 - Preview Page: https://fixledger-iota.vercel.app/fixes/mcp-streamable-http-serverless-stateless-session - x402 Unlock URL: https://fixledger-iota.vercel.app/api/x402/unlock?id=mcp-streamable-http-serverless-stateless-session ### [mcp] console.log Corrupting MCP StdioServerTransport JSON-RPC stdout Stream - Slug / ID: `mcp-stdio-console-log-corrupting-jsonrpc-stdout` (`11111111-1111-4111-8111-b20000000002`) - Package & Semver: `@modelcontextprotocol/sdk` (`>=1.0.0`, runtime: `nodejs`) - Canonical Error Signature: `SyntaxError: Unexpected token 'S', "Server sta"... is not valid JSON in StdioClientTransport` - Verification & ROI: 134 verified passes (sandbox_docker_exit_0), saves ~23,000 tokens for $0.005 - Preview Page: https://fixledger-iota.vercel.app/fixes/mcp-stdio-console-log-corrupting-jsonrpc-stdout - x402 Unlock URL: https://fixledger-iota.vercel.app/api/x402/unlock?id=mcp-stdio-console-log-corrupting-jsonrpc-stdout ### [mcp] JSON-RPC Notification (notifications/initialized) Must Return HTTP 202 Empty Body - Slug / ID: `mcp-notifications-initialized-202-no-response-body` (`11111111-1111-4111-8111-b20000000003`) - Package & Semver: `@modelcontextprotocol/sdk` (`>=1.5.0`, runtime: `any`) - Canonical Error Signature: `Error: MCP Streamable HTTP client rejected JSON-RPC response with id: null on notifications/initialized` - Verification & ROI: 46 verified passes (sandbox_docker_exit_0), saves ~18,900 tokens for $0.005 - Preview Page: https://fixledger-iota.vercel.app/fixes/mcp-notifications-initialized-202-no-response-body - x402 Unlock URL: https://fixledger-iota.vercel.app/api/x402/unlock?id=mcp-notifications-initialized-202-no-response-body ### [mcp] Return isError: true Inside MCP Tool Result So Agents Can Self-Correct - Slug / ID: `mcp-tool-error-iserror-true-vs-jsonrpc-exception` (`11111111-1111-4111-8111-b20000000004`) - Package & Semver: `@modelcontextprotocol/sdk` (`>=1.0.0`, runtime: `any`) - Canonical Error Signature: `McpError: MCP error -32603: Tool execution threw unhandled exception instead of actionable tool error content` - Verification & ROI: 62 verified passes (sandbox_docker_exit_0), saves ~15,400 tokens for $0.005 - Preview Page: https://fixledger-iota.vercel.app/fixes/mcp-tool-error-iserror-true-vs-jsonrpc-exception - x402 Unlock URL: https://fixledger-iota.vercel.app/api/x402/unlock?id=mcp-tool-error-iserror-true-vs-jsonrpc-exception ### [mcp] MCP Tool inputSchema Rejected Due to $ref Recursion in zodToJsonSchema - Slug / ID: `mcp-zod-to-json-schema-ref-rejected-by-llm-providers` (`11111111-1111-4111-8111-b20000000005`) - Package & Semver: `@modelcontextprotocol/sdk` (`>=1.0.0`, runtime: `any`) - Canonical Error Signature: `Error: Invalid function parameters schema: $ref / definitions / oneOf not supported in tool inputSchema` - Verification & ROI: 57 verified passes (sandbox_docker_exit_0), saves ~20,400 tokens for $0.005 - Preview Page: https://fixledger-iota.vercel.app/fixes/mcp-zod-to-json-schema-ref-rejected-by-llm-providers - x402 Unlock URL: https://fixledger-iota.vercel.app/api/x402/unlock?id=mcp-zod-to-json-schema-ref-rejected-by-llm-providers ### [mcp] Python FastMCP Event Loop Conflict Inside Existing ASGI / FastAPI Server - Slug / ID: `fastmcp-python-asyncio-event-loop-already-running` (`11111111-1111-4111-8111-b20000000006`) - Package & Semver: `mcp` (`>=1.2.0`, runtime: `python`) - Canonical Error Signature: `RuntimeError: Already running asyncio in this thread or This event loop is already running when calling mcp.run() inside FastAPI / Jupyter` - Verification & ROI: 49 verified passes (sandbox_docker_exit_0), saves ~17,900 tokens for $0.005 - Preview Page: https://fixledger-iota.vercel.app/fixes/fastmcp-python-asyncio-event-loop-already-running - x402 Unlock URL: https://fixledger-iota.vercel.app/api/x402/unlock?id=fastmcp-python-asyncio-event-loop-already-running ### [ai-sdk] Vercel AI SDK v4+ Unified `tools` + `tool({ parameters })` + `maxSteps` Migration - Slug / ID: `vercel-ai-sdk-v4-tool-parameters-maxsteps` (`11111111-1111-4111-8111-111111111107`) - Package & Semver: `ai` (`>=4.0.0`, runtime: `any`) - Canonical Error Signature: `AI_APICallError: Invalid schema for function tool or legacy `experimental_ToolCall` / `functions` property rejected in streamText` - Verification & ROI: 68 verified passes (sandbox_docker_exit_0), saves ~19,800 tokens for $0.005 - Preview Page: https://fixledger-iota.vercel.app/fixes/vercel-ai-sdk-v4-tool-parameters-maxsteps - x402 Unlock URL: https://fixledger-iota.vercel.app/api/x402/unlock?id=vercel-ai-sdk-v4-tool-parameters-maxsteps ### [llm-api] Retired Frontier LLM Model Identifier 404 Replacement Map - Slug / ID: `deprecated-llm-model-not-found-404` (`11111111-1111-4111-8111-111111111108`) - Package & Semver: `llm-models` (`*`, runtime: `any`) - Canonical Error Signature: `HTTP 404 model_not_found: The model `gpt-4-turbo-preview` or `claude-3-sonnet-20240229` or `gemini-1.5-pro` does not exist or has been retired` - Verification & ROI: 142 verified passes (sandbox_docker_exit_0), saves ~12,000 tokens for $0.005 - Preview Page: https://fixledger-iota.vercel.app/fixes/deprecated-llm-model-not-found-404 - x402 Unlock URL: https://fixledger-iota.vercel.app/api/x402/unlock?id=deprecated-llm-model-not-found-404 ### [llm-api] OpenAI o-Series Reasoning Models Reject temperature / top_p Parameters - Slug / ID: `openai-reasoning-models-unsupported-temperature-parameter` (`11111111-1111-4111-8111-c30000000003`) - Package & Semver: `openai` (`>=4.60.0`, runtime: `any`) - Canonical Error Signature: `BadRequestError: 400 Unsupported parameter: 'temperature' is not supported with this model (o3 / o4-mini / o1)` - Verification & ROI: 95 verified passes (sandbox_docker_exit_0), saves ~13,400 tokens for $0.005 - Preview Page: https://fixledger-iota.vercel.app/fixes/openai-reasoning-models-unsupported-temperature-parameter - x402 Unlock URL: https://fixledger-iota.vercel.app/api/x402/unlock?id=openai-reasoning-models-unsupported-temperature-parameter ### [llm-api] Anthropic Extended Thinking max_tokens > budget_tokens & Temperature Constraint - Slug / ID: `anthropic-extended-thinking-budget-tokens-max-tokens-400` (`11111111-1111-4111-8111-c30000000004`) - Package & Semver: `@anthropic-ai/sdk` (`>=0.36.0`, runtime: `any`) - Canonical Error Signature: `BadRequestError: 400 invalid_request_error: `max_tokens` must be strictly greater than `thinking.budget_tokens` and temperature must be 1 when thinking is enabled` - Verification & ROI: 74 verified passes (sandbox_docker_exit_0), saves ~16,800 tokens for $0.005 - Preview Page: https://fixledger-iota.vercel.app/fixes/anthropic-extended-thinking-budget-tokens-max-tokens-400 - x402 Unlock URL: https://fixledger-iota.vercel.app/api/x402/unlock?id=anthropic-extended-thinking-budget-tokens-max-tokens-400 ### [llm-api] Google Gemini Unified @google/genai SDK Migration (GoogleGenAI vs GoogleGenerativeAI) - Slug / ID: `google-genai-unified-sdk-migration-from-generative-ai` (`11111111-1111-4111-8111-c30000000005`) - Package & Semver: `@google/genai` (`>=0.1.0`, runtime: `any`) - Canonical Error Signature: `TypeError: GoogleGenerativeAI is not a constructor or @google/generative-ai deprecated package mismatch with @google/genai` - Verification & ROI: 88 verified passes (sandbox_docker_exit_0), saves ~18,500 tokens for $0.005 - Preview Page: https://fixledger-iota.vercel.app/fixes/google-genai-unified-sdk-migration-from-generative-ai - x402 Unlock URL: https://fixledger-iota.vercel.app/api/x402/unlock?id=google-genai-unified-sdk-migration-from-generative-ai ### [ai-sdk] OpenAI Strict Structured Outputs Rejects z.optional() Without .nullable() - Slug / ID: `openai-structured-outputs-zod-optional-without-nullable` (`11111111-1111-4111-8111-c30000000006`) - Package & Semver: `ai` (`>=4.0.0`, runtime: `any`) - Canonical Error Signature: `AI_APICallError: Invalid schema for response_format: 'required' is required to be supplied and to be an array including every key in properties` - Verification & ROI: 79 verified passes (sandbox_docker_exit_0), saves ~15,900 tokens for $0.005 - Preview Page: https://fixledger-iota.vercel.app/fixes/openai-structured-outputs-zod-optional-without-nullable - x402 Unlock URL: https://fixledger-iota.vercel.app/api/x402/unlock?id=openai-structured-outputs-zod-optional-without-nullable ### [ai-sdk] LangGraph Parallel Node Fan-Out InvalidUpdateError Missing Annotated Reducer - Slug / ID: `langgraph-invalid-update-error-concurrent-fanout-reducer` (`11111111-1111-4111-8111-c30000000007`) - Package & Semver: `langgraph` (`>=0.2.0`, runtime: `python`) - Canonical Error Signature: `InvalidUpdateError: At key 'results': Can receive only one value per step. Use an Annotated key to handle multiple values` - Verification & ROI: 52 verified passes (sandbox_docker_exit_0), saves ~17,100 tokens for $0.005 - Preview Page: https://fixledger-iota.vercel.app/fixes/langgraph-invalid-update-error-concurrent-fanout-reducer - x402 Unlock URL: https://fixledger-iota.vercel.app/api/x402/unlock?id=langgraph-invalid-update-error-concurrent-fanout-reducer ### [nextjs] Next.js 15+ Asynchronous Request APIs (headers, cookies, params, searchParams) - Slug / ID: `nextjs-15-async-headers-cookies-params` (`11111111-1111-4111-8111-111111111103`) - Package & Semver: `next` (`>=15.0.0`, runtime: `nodejs`) - Canonical Error Signature: `Error: Route /api/stripe/webhook used "headers()" without await. `headers()`, `cookies()`, and `params` are now asynchronous in Next.js 15+` - Verification & ROI: 118 verified passes (sandbox_docker_exit_0), saves ~14,500 tokens for $0.005 - Preview Page: https://fixledger-iota.vercel.app/fixes/nextjs-15-async-headers-cookies-params - x402 Unlock URL: https://fixledger-iota.vercel.app/api/x402/unlock?id=nextjs-15-async-headers-cookies-params ### [nextjs] Next.js redirect() Caught as Error: NEXT_REDIRECT Inside try/catch Blocks - Slug / ID: `nextjs-server-action-redirect-swallowed-inside-try-catch` (`11111111-1111-4111-8111-d40000000002`) - Package & Semver: `next` (`>=13.4.0`, runtime: `nodejs`) - Canonical Error Signature: `Error: NEXT_REDIRECT thrown and caught inside try/catch block in Server Action preventing navigation` - Verification & ROI: 109 verified passes (sandbox_docker_exit_0), saves ~16,400 tokens for $0.005 - Preview Page: https://fixledger-iota.vercel.app/fixes/nextjs-server-action-redirect-swallowed-inside-try-catch - x402 Unlock URL: https://fixledger-iota.vercel.app/api/x402/unlock?id=nextjs-server-action-redirect-swallowed-inside-try-catch ### [nextjs] React 19 useActionState (from 'react') Replaces Deprecated useFormState (from 'react-dom') - Slug / ID: `react-19-useactionstate-replaces-react-dom-useformstate` (`11111111-1111-4111-8111-d40000000003`) - Package & Semver: `react` (`>=19.0.0`, runtime: `browser`) - Canonical Error Signature: `Attempted import error: 'useFormState' is not exported from 'react-dom' or ReactDOM.useFormState has been renamed to React.useActionState` - Verification & ROI: 97 verified passes (sandbox_docker_exit_0), saves ~13,800 tokens for $0.005 - Preview Page: https://fixledger-iota.vercel.app/fixes/react-19-useactionstate-replaces-react-dom-useformstate - x402 Unlock URL: https://fixledger-iota.vercel.app/api/x402/unlock?id=react-19-useactionstate-replaces-react-dom-useformstate ### [nextjs] Next.js DynamicServerError When Static Export or force-static Reads Request Headers - Slug / ID: `nextjs-dynamic-server-usage-static-route-headers` (`11111111-1111-4111-8111-d40000000004`) - Package & Semver: `next` (`>=14.0.0`, runtime: `nodejs`) - Canonical Error Signature: `DynamicServerError: Dynamic server usage: Route couldn't be rendered statically because it used `request.headers` or `cookies`` - Verification & ROI: 84 verified passes (sandbox_docker_exit_0), saves ~17,500 tokens for $0.005 - Preview Page: https://fixledger-iota.vercel.app/fixes/nextjs-dynamic-server-usage-static-route-headers - x402 Unlock URL: https://fixledger-iota.vercel.app/api/x402/unlock?id=nextjs-dynamic-server-usage-static-route-headers ### [nextjs] Next.js next/image Hostname Allowlist via images.remotePatterns - Slug / ID: `nextjs-image-remote-patterns-replaces-domains` (`11111111-1111-4111-8111-d40000000005`) - Package & Semver: `next` (`>=14.0.0`, runtime: `any`) - Canonical Error Signature: `Error: Invalid src prop on `next/image`, hostname is not configured under images in your `next.config` (images.domains deprecated)` - Verification & ROI: 73 verified passes (sandbox_docker_exit_0), saves ~11,200 tokens for $0.005 - Preview Page: https://fixledger-iota.vercel.app/fixes/nextjs-image-remote-patterns-replaces-domains - x402 Unlock URL: https://fixledger-iota.vercel.app/api/x402/unlock?id=nextjs-image-remote-patterns-replaces-domains ### [tailwind] Tailwind CSS v4 PostCSS Plugin & CSS-First @import Migration - Slug / ID: `tailwind-v4-postcss-css-first-migration` (`11111111-1111-4111-8111-111111111104`) - Package & Semver: `tailwindcss` (`>=4.0.0`, runtime: `any`) - Canonical Error Signature: `Error: It looks like you're trying to use `tailwindcss` directly as a PostCSS plugin. The PostCSS plugin has moved to a separate package `@tailwindcss/postcss`` - Verification & ROI: 93 verified passes (sandbox_docker_exit_0), saves ~17,200 tokens for $0.005 - Preview Page: https://fixledger-iota.vercel.app/fixes/tailwind-v4-postcss-css-first-migration - x402 Unlock URL: https://fixledger-iota.vercel.app/api/x402/unlock?id=tailwind-v4-postcss-css-first-migration ### [tailwind] Tailwind CSS v4 @apply Inside CSS Modules Requires @reference Directive - Slug / ID: `tailwind-v4-apply-unknown-utility-css-modules-reference` (`11111111-1111-4111-8111-d40000000007`) - Package & Semver: `tailwindcss` (`>=4.0.0`, runtime: `any`) - Canonical Error Signature: `CssSyntaxError: Cannot apply unknown utility class `px-4` or `bg-zinc-900` inside CSS Module / Vue / Svelte