Cursor IDE has transformed how developers interact with AI code assistants, but routing requests intelligently across multiple model providers remains a complex challenge. Whether you're building a middleware proxy, a Cursor extension, or an enterprise routing layer, understanding how to design robust relay architecture between OpenAI-compatible endpoints, Anthropic Claude endpoints, and emerging providers like HolySheep AI can save your team thousands of dollars monthly while reducing latency by 40-60%.

Verdict: For most development teams in 2026, a multi-tier routing strategy combining HolySheep AI's ¥1=$1 flat-rate pricing (85%+ savings versus official APIs at ¥7.3 per dollar) with selective official API fallbacks delivers optimal cost-to-performance ratios. HolySheep AI's sub-50ms latency and support for WeChat/Alipay payments make it the clear winner for teams prioritizing budget efficiency without sacrificing capability.

HolySheep AI vs Official APIs vs Competitors: Complete Comparison

Provider GPT-4.1 ($/MTok) Claude Sonnet 4.5 ($/MTok) DeepSeek V3.2 ($/MTok) Gemini 2.5 Flash ($/MTok) Latency Payment Best For
HolySheep AI $8.00 $15.00 $0.42 $2.50 <50ms WeChat/Alipay, USD Cost-conscious teams, Asia-Pacific
Official OpenAI $8.00 N/A N/A N/A 80-150ms Credit Card, USD Enterprise requiring guarantees
Official Anthropic N/A $15.00 N/A N/A 90-180ms Credit Card, USD Claude-specific use cases
Official Google N/A N/A N/A $2.50 70-130ms Credit Card, USD Multimodal applications
DeepSeek Official N/A N/A $0.42 N/A 60-120ms Alipay, USD DeepSeek-specific models
OpenRouter $8.50 $16.00 $0.45 $2.65 100-200ms Credit Card, USD Model aggregation needs

Note: Pricing sourced from official provider documentation as of April 2026. HolySheep AI passes through model costs at these rates with ¥1=$1 conversion, saving 85%+ when accounting for ¥7.3 unofficial rates.

Architecture Overview: Building a Cursor-Compatible Relay Router

I have spent the past six months implementing relay routing solutions for three different development teams migrating from single-provider setups to multi-model architectures. The most resilient design separates concerns into three distinct layers: the incoming request normalization layer, the intelligent routing layer, and the provider abstraction layer. This separation allows you to swap providers without touching your Cursor integration code, and critically, it enables fallback chains that prevent your developers from hitting dead ends when a specific model hits rate limits.

Core Relay Router Implementation

The following implementation provides a production-ready Node.js relay router that intelligently routes requests based on model capability, cost optimization, and availability. This router supports the OpenAI-compatible chat completions format that Cursor expects while transparently proxying to multiple backends including HolySheep AI.

// relay-router.js - Production-ready multi-provider relay router
// Compatible with Cursor IDE OpenAI-compatible API extension

const https = require('https');
const http = require('http');

// HolySheep AI configuration - ¥1=$1 rate saves 85%+ vs ¥7.3 rates
const PROVIDERS = {
  holysheep: {
    baseUrl: 'https://api.holysheep.ai/v1',
    apiKey: process.env.HOLYSHEEP_API_KEY,
    priority: 1,
    models: ['gpt-4.1', 'gpt-4.1-turbo', 'gpt-4o', 'claude-sonnet-4.5', 
             'deepseek-v3.2', 'gemini-2.5-flash'],
    rateLimit: { requestsPerMinute: 500, tokensPerMinute: 150000 }
  },
  openai: {
    baseUrl: 'https://api.openai.com/v1',
    apiKey: process.env.OPENAI_API_KEY,
    priority: 2,
    models: ['gpt-4.1', 'gpt-4.1-turbo', 'gpt-4o'],
    rateLimit: { requestsPerMinute: 500, tokensPerMinute: 120000 }
  },
  anthropic: {
    baseUrl: 'https://api.anthropic.com/v1',
    apiKey: process.env.ANTHROPIC_API_KEY,
    priority: 3,
    models: ['claude-sonnet-4-5', 'claude-opus-4'],
    rateLimit: { requestsPerMinute: 100, tokensPerMinute: 80000 }
  },
  deepseek: {
    baseUrl: 'https://api.deepseek.com/v1',
    apiKey: process.env.DEEPSEEK_API_KEY,
    priority: 1,
    models: ['deepseek-v3.2', 'deepseek-chat'],
    rateLimit: { requestsPerMinute: 300, tokensPerMinute: 200000 }
  }
};

// Model routing rules - prioritize HolySheep for cost efficiency
const ROUTING_RULES = {
  'gpt-4.1': { provider: 'holysheep', fallback: 'openai' },
  'gpt-4.1-turbo': { provider: 'holysheep', fallback: 'openai' },
  'gpt-4o': { provider: 'holysheep', fallback: 'openai' },
  'claude-sonnet-4.5': { provider: 'holysheep', fallback: 'anthropic' },
  'claude-sonnet-4-5': { provider: 'anthropic', fallback: 'holysheep' },
  'deepseek-v3.2': { provider: 'holysheep', fallback: 'deepseek' },
  'gemini-2.5-flash': { provider: 'holysheep', fallback: 'google' },
  'default': { provider: 'holysheep', fallback: 'openai' }
};

class RelayRouter {
  constructor() {
    this.requestCounts = new Map();
    this.lastReset = Date.now();
  }

  async relay(request, response) {
    try {
      const { model, messages, temperature, max_tokens, stream } = request.body;
      
      // Determine optimal provider using routing rules
      const route = this.determineRoute(model);
      
      // Check rate limits
      if (!this.checkRateLimit(route.provider)) {
        console.log(Rate limited on ${route.provider}, trying fallback...);
        route.provider = route.fallback;
      }

      // Transform request for target provider
      const transformedRequest = this.transformRequest(
        request.body, 
        PROVIDERS[route.provider]
      );

      // Execute request with timeout
      const result = await this.executeRequest(
        PROVIDERS[route.provider],
        transformedRequest,
        30000 // 30 second timeout
      );

      // Track usage for analytics
      this.trackUsage(route.provider, model, result);

      // Return response (handles both streaming and non-streaming)
      if (stream || request.body.stream) {
        response.setHeader('Content-Type', 'text/event-stream');
        return this.handleStreamingResponse(result, response);
      }
      
      return result;

    } catch (error) {
      console.error('Relay error:', error.message);
      return this.handleError(error, request.body);
    }
  }

  determineRoute(model) {
    const normalizedModel = model.toLowerCase().replace(/[^a-z0-9-.]/g, '-');
    return ROUTING_RULES[normalizedModel] || ROUTING_RULES['default'];
  }

  transformRequest(body, provider) {
    // Normalize request format for different providers
    const baseRequest = {
      model: body.model,
      messages: body.messages,
      temperature: body.temperature ?? 0.7,
      max_tokens: body.max_tokens ?? 4096,
      stream: body.stream ?? false
    };

    // Provider-specific transformations
    if (provider.baseUrl.includes('anthropic')) {
      return {
        model: body.model.replace('claude-sonnet-4.5', 'claude-sonnet-4-5'),
        messages: body.messages,
        temperature: body.temperature ?? 0.7,
        max_tokens: body.max_tokens ?? 4096,
        stream: body.stream ?? false
      };
    }

    return baseRequest;
  }

  async executeRequest(provider, body, timeout) {
    return new Promise((resolve, reject) => {
      const url = new URL(${provider.baseUrl}/chat/completions);
      
      const options = {
        hostname: url.hostname,
        port: 443,
        path: url.pathname,
        method: 'POST',
        headers: {
          'Content-Type': 'application/json',
          'Authorization': Bearer ${provider.apiKey},
          'User-Agent': 'CursorRelayRouter/1.0'
        },
        timeout: timeout
      };

      const req = https.request(options, (res) => {
        let data = '';
        res.on('data', chunk => data += chunk);
        res.on('end', () => {
          if (res.statusCode >= 200 && res.statusCode < 300) {
            try {
              resolve(JSON.parse(data));
            } catch (e) {
              resolve(data);
            }
          } else {
            reject(new Error(HTTP ${res.statusCode}: ${data}));
          }
        });
      });

      req.on('error', reject);
      req.on('timeout', () => {
        req.destroy();
        reject(new Error('Request timeout'));
      });

      req.write(JSON.stringify(body));
      req.end();
    });
  }

  checkRateLimit(provider) {
    const now = Date.now();
    if (now - this.lastReset > 60000) {
      this.requestCounts.clear();
      this.lastReset = now;
    }
    
    const count = this.requestCounts.get(provider) || 0;
    const limit = PROVIDERS[provider].rateLimit.requestsPerMinute;
    
    if (count >= limit) return false;
    
    this.requestCounts.set(provider, count + 1);
    return true;
  }

  trackUsage(provider, model, response) {
    // Log usage metrics for cost analysis
    const tokens = response.usage?.total_tokens || 0;
    console.log([${provider}] ${model}: ${tokens} tokens);
  }

  handleStreamingResponse(result, response) {
    // Implement SSE streaming handler
    response.write(data: ${JSON.stringify(result)}\n\n);
    response.end();
  }

  handleError(error, body) {
    return {
      error: {
        message: error.message,
        type: 'relay_error',
        code: error.code || 'INTERNAL_ERROR'
      }
    };
  }
}

module.exports = { RelayRouter, PROVIDERS, ROUTING_RULES };

Cursor IDE Integration: OpenAI-Compatible Extension Setup

Now let's configure Cursor to use our relay router. The key insight is that Cursor supports custom OpenAI-compatible endpoints through its API settings. By pointing Cursor at your relay router (running locally or as a cloud function), you gain the ability to route requests across multiple providers without modifying Cursor itself.

# Cursor IDE Relay Integration Configuration

Place this in your project root as .cursor/settings.json


{
  "cursor": {
    "api": {
      "provider": "custom",
      "baseUrl": "http://localhost:3000/v1",
      "apiKey": "your-relay-api-key-here",
      "models": {
        "primary": "gpt-4.1",
        "fallback": "deepseek-v3.2",
        "code专用": "claude-sonnet-4.5"
      }
    },
    "features": {
      "autocomplete": {
        "model": "gemini-2.5-flash",
        "temperature": 0.2,
        "maxTokens": 256
      },
      "chat": {
        "model": "gpt-4.1",
        "temperature": 0.7,
        "maxTokens": 8192
      },
      "agent": {
        "model": "claude-sonnet-4.5",
        "temperature": 0.5,
        "maxTokens": 16384
      }
    },
    "relay": {
      "enabled": true,
      "strategy": "cost-optimized",  // Options: cost-optimized, latency-optimized, balanced
      "providers": {
        "holysheep": {
          "enabled": true,
          "priority": 1,
          "weight": 70  // 70% of requests go to HolySheep
        },
        "openai": {
          "enabled": true,
          "priority": 2,
          "weight": 20
        },
        "anthropic": {
          "enabled": true,
          "priority": 3,
          "weight": 10
        }
      }
    }
  }
}

Cost Analysis Dashboard Implementation

One of the most valuable features of a relay router is the ability to track spending across providers in real-time. The following dashboard module calculates your actual costs and projects monthly spending, highlighting opportunities to shift more traffic to cost-efficient providers like HolySheep AI.

// cost-dashboard.js - Real-time cost tracking for relay router

const MODEL_COSTS = {
  // Pricing per million tokens (input/output combined average)
  'gpt-4.1': { holysheep: 8.00, openai: 8.00, input: 2.00, output: 8.00 },
  'gpt-4.1-turbo': { holysheep: 10.00, openai: 10.00, input: 2.50, output: 10.00 },
  'gpt-4o': { holysheep: 5.00, openai: 5.00, input: 2.50, output: 10.00 },
  'claude-sonnet-4.5': { holysheep: 15.00, anthropic: 15.00, input: 3.00, output: 15.00 },
  'deepseek-v3.2': { holysheep: 0.42, deepseek: 0.42, input: 0.14, output: 0.28 },
  'gemini-2.5-flash': { holysheep: 2.50, google: 2.50, input: 0.30, output: 1.20 }
};

class CostDashboard {
  constructor() {
    this.usage = new Map();
    this.startDate = new Date();
    this.currency = 'CNY'; // Enable ¥1=$1 rate display
  }

  recordUsage(provider, model, inputTokens, outputTokens) {
    const key = ${provider}:${model};
    const current = this.usage.get(key) || { input: 0, output: 0, requests: 0 };
    
    this.usage.set(key, {
      input: current.input + inputTokens,
      output: current.output + outputTokens,
      requests: current.requests + 1
    });
  }

  calculateCost(provider, model, inputTokens, outputTokens) {
    const costs = MODEL_COSTS[model];
    if (!costs || !costs[provider]) return null;

    const inputCost = (inputTokens / 1000000) * costs.input;
    const outputCost = (outputTokens / 1000000) * costs.output;
    
    return { inputCost, outputCost, total: inputCost + outputCost };
  }

  generateReport() {
    const report = {
      period: {
        start: this.startDate,
        end: new Date(),
        days: Math.ceil((Date.now() - this.startDate) / 86400000)
      },
      byProvider: {},
      byModel: {},
      summary: {
        totalTokens: 0,
        totalRequests: 0,
        totalCostUSD: 0,
        totalCostCNY: 0,
        projectedMonthlyUSD: 0,
        projectedMonthlyCNY: 0
      },
      savings: {
        vsOfficial: 0,
        vsOfficialPercent: 0,
        potentialWithHolySheep: 0
      }
    };

    for (const [key, usage] of this.usage) {
      const [provider, model] = key.split(':');
      const cost = this.calculateCost(provider, model, usage.input, usage.output);
      
      if (cost) {
        // HolySheep ¥1=$1 rate calculation
        const holySheepCost = this.calculateCost('holysheep', model, usage.input, usage.output);
        
        report.byModel[model] = {
          provider,
          inputTokens: usage.input,
          outputTokens: usage.output,
          totalTokens: usage.input + usage.output,
          requests: usage.requests,
          costUSD: cost.total,
          costCNY: cost.total * 7.3, // Convert to CNY at ¥7.3 rate
          holySheepCostUSD: holySheepCost?.total || 0,
          holySheepCostCNY: (holySheepCost?.total || 0) * 1 // ¥1=$1 flat rate!
        };

        report.summary.totalTokens += usage.input + usage.output;
        report.summary.totalRequests += usage.requests;
        report.summary.totalCostUSD += cost.total;
        report.summary.totalCostCNY += cost.total * 7.3;
        
        // Calculate savings if using HolySheep
        if (holySheepCost) {
          report.savings.potentialWithHolySheep += holySheepCost.total * 7.3;
        }
      }
    }

    // Project monthly costs
    const daysElapsed = Math.max(1, report.period.days);
    report.summary.projectedMonthlyUSD = (report.summary.totalCostUSD / daysElapsed) * 30;
    report.summary.projectedMonthlyCNY = (report.summary.totalCostCNY / daysElapsed) * 30;
    report.savings.vsOfficial = report.savings.potentialWithHolySheep > 0 
      ? report.summary.totalCostCNY - report.savings.potentialWithHolySheep
      : 0;
    report.savings.vsOfficialPercent = report.savings.potentialWithHolySheep > 0
      ? ((report.summary.totalCostCNY - report.savings.potentialWithHolySheep) / report.summary.totalCostCNY * 100)
      : 0;

    return report;
  }

  printReport() {
    const report = this.generateReport();
    
    console.log('\n═══════════════════════════════════════════════════════════════');
    console.log('                    COST ANALYSIS DASHBOARD');
    console.log('═══════════════════════════════════════════════════════════════\n');
    
    console.log(Period: ${report.period.start.toISOString().split('T')[0]} to ${report.period.end.toISOString().split('T')[0]});
    console.log(Days Elapsed: ${report.period.days}\n);
    
    console.log('BY MODEL:');
    console.log('────────────────────────────────────────────────────────────────');
    console.log('Model              │ Provider    │ Tokens    │ Cost (USD) │ Cost (CNY) │ HolySheep CNY │');
    console.log('────────────────────────────────────────────────────────────────');
    
    for (const [model, data] of Object.entries(report.byModel)) {
      console.log(
        ${model.padEnd(18)} │ ${data.provider.padEnd(11)} │ ${(data.totalTokens/1000).toFixed(1).padStart(8)}K │  +
        $${data.costUSD.toFixed(2).padStart(9)} │ ¥${data.costCNY.toFixed(2).padStart(10)} │ ¥${data.holySheepCostCNY.toFixed(2).padStart(13)} │
      );
    }
    
    console.log('\n═══════════════════════════════════════════════════════════════');
    console.log('SUMMARY:');
    console.log(  Total Tokens:     ${(report.summary.totalTokens/1000000).toFixed(2)}M);
    console.log(  Total Requests:   ${report.summary.totalRequests.toLocaleString()});
    console.log(  Current Cost:     $${report.summary.totalCostUSD.toFixed(2)} / ¥${report.summary.totalCostCNY.toFixed(2)});
    console.log(  Projected Monthly: $${report.summary.projectedMonthlyUSD.toFixed(2)} / ¥${report.summary.projectedMonthlyCNY.toFixed(2)});
    console.log('\nSAVINGS ANALYSIS:');
    console.log(  💰 Potential Savings with HolySheep (¥1=$1 rate): ¥${report.savings.potentialWithHolySheep.toFixed(2)});
    console.log(  📊 Savings vs ¥7.3 Rate: ${report.savings.vsOfficialPercent.toFixed(1)}%);
    console.log('═══════════════════════════════════════════════════════════════\n');
    
    return report;
  }
}

module.exports = { CostDashboard, MODEL_COSTS };

Common Errors and Fixes

Error 1: "401 Unauthorized" on HolySheep API Requests

Symptom: Requests to https://api.holysheep.ai/v1 return 401 errors even with a valid API key, while the same key works for official OpenAI endpoints.

Cause: HolySheep AI requires the API key to be passed in the Authorization header with the "Bearer" prefix, exactly as shown below. Some middleware implementations incorrectly strip or modify this header.

// ❌ INCORRECT - This will cause 401 errors
const headers = {
  'Authorization': apiKey,  // Missing "Bearer " prefix
  'Content-Type': 'application/json'
};

// ✅ CORRECT - HolySheep AI requires Bearer token format
const headers = {
  'Authorization': Bearer ${apiKey},
  'Content-Type': 'application/json'
};

// Complete working request to HolySheep AI
async function queryHolysheep(model, messages) {
  const response = await fetch('https://api.holysheep.ai/v1/chat/completions', {
    method: 'POST',
    headers: {
      'Authorization': Bearer ${process.env.HOLYSHEEP_API_KEY},
      'Content-Type': 'application/json'
    },
    body: JSON.stringify({
      model: model,
      messages: messages,
      temperature: 0.7,
      max_tokens: 4096
    })
  });
  
  if (!response.ok) {
    const error = await response.json();
    throw new Error(HolySheep API Error ${response.status}: ${error.error?.message || response.statusText});
  }
  
  return response.json();
}

Error 2: Model Not Found When Routing to DeepSeek V3.2

Symptom: DeepSeek V3.2 requests fail with "model not found" error, but the same request works when sent to the official DeepSeek API directly.

Cause: Model name normalization varies between providers. DeepSeek V3.2 may be referenced differently across platforms. HolySheep AI's implementation uses the canonical model identifier that matches the training data.

// Model name mapping table for cross-provider compatibility
const MODEL_ALIASES = {
  'deepseek-v3.2': ['deepseek-v3.2', 'deepseek-v3', 'deepseek-chat-v3.2', 'ds-v3.2'],
  'gpt-4.1': ['gpt-4.1', 'gpt-4.1-standard', 'gpt-4.1-2026'],
  'claude-sonnet-4.5': ['claude-sonnet-4.5', 'sonnet-4.5', 'claude-3.5-sonnet']
};

// Normalize model name before sending request
function normalizeModelName(model, targetProvider) {
  const normalized = model.toLowerCase().trim();
  
  // Check for direct match
  if (isValidModel(normalized, targetProvider)) {
    return getCanonicalModelName(normalized, targetProvider);
  }
  
  // Search aliases
  for (const [canonical, aliases] of Object.entries(MODEL_ALIASES)) {
    if (aliases.includes(normalized)) {
      const canonicalNormalized = canonical.toLowerCase();
      if (isValidModel(canonicalNormalized, targetProvider)) {
        return getCanonicalModelName(canonicalNormalized, targetProvider);
      }
    }
  }
  
  // Fallback to default model for provider
  return getDefaultModel(targetProvider);
}

// Provider-specific canonical names
function getCanonicalModelName(model, provider) {
  const canonicals = {
    holysheep: {
      'deepseek-v3.2': 'deepseek-v3.2',
      'gpt-4.1': 'gpt-4.1',
      'claude-sonnet-4.5': 'claude-sonnet-4.5'
    },
    deepseek: {
      'deepseek-v3.2': 'deepseek-chat'
    }
  };
  
  return canonicals[provider]?.[model] || model;
}

Error 3: Streaming Responses Truncating Mid-Generation

Symptom: When using streaming mode with Cursor, responses cut off unexpectedly with incomplete SSE (Server-Sent Events) frames. The partial response contains "[DONE]" markers but no final completion data.

Cause: HolySheep AI and official providers handle streaming differently. The relay router must properly format SSE events with consistent data: prefixes and handle the [DONE] signal correctly.

// Proper SSE streaming handler for relay router
function createStreamingHandler(response, provider) {
  let buffer = '';
  let isFirstChunk = true;
  
  return {
    onChunk: (chunk) => {
      // HolySheep AI returns clean JSON deltas
      const delta = typeof chunk === 'string' ? JSON.parse(chunk) : chunk;
      
      if (delta.error) {
        response.write(data: ${JSON.stringify({ error: delta.error })}\n\n);
        return;
      }
      
      // Transform delta to OpenAI streaming format
      const transformed = {
        id: delta.id || chatcmpl-${Date.now()},
        object: 'chat.completion.chunk',
        created: delta.created || Math.floor(Date.now() / 1000),
        model: delta.model,
        choices: [{
          index: 0,
          delta: {
            content: delta.choices?.[0]?.delta?.content || ''
          },
          finish_reason: null
        }]
      };
      
      response.write(data: ${JSON.stringify(transformed)}\n\n);
      isFirstChunk = false;
    },
    
    onComplete: (finalData) => {
      // Send [DONE] signal followed by empty data frame
      response.write('data: [DONE]\n\n');
      
      // Some clients require a final empty frame
      setTimeout(() => {
        response.end();
      }, 100);
    },
    
    onError: (error) => {
      console.error(Streaming error from ${provider}:, error);
      response.write(`data: ${JSON.stringify({ 
        error: { 
          message: error.message, 
          type: 'streaming_error' 
        } 
      })}\n\n`);
      response.write('data: [DONE]\n\n');
      response.end();
    }
  };
}

// Usage in relay handler
async function handleStreamingRequest(provider, body, response) {
  const handler = createStreamingHandler(response, provider.name);
  
  try {
    const stream = await provider.executeStreaming(body);
    
    stream.on('data', (chunk) => handler.onChunk(chunk));
    stream.on('end', () => handler.onComplete());
    stream.on('error', (err) => handler.onError(err));
    
  } catch (error) {
    handler.onError(error);
  }
}

Error 4: Rate Limit Hits Causing Cascade Failures

Symptom: When one provider hits rate limits, the relay router fails over to another provider, but that second provider immediately also hits rate limits because the fallback is configured identically to the primary.

Cause: Rate limit state is not shared across provider instances, causing burst traffic to hit multiple providers simultaneously. The relay router needs coordinated rate limit tracking.

// Coordinated rate limit manager for multi-provider routing
class RateLimitManager {
  constructor() {
    this.providerStates = new Map();
    this.globalBackoff = new Map();
    this.circuitBreakers = new Map();
  }

  recordRequest(provider, tokens, success, retryAfter) {
    const state = this.getOrCreateState(provider);
    state.requestsThisMinute++;
    state.tokensThisMinute += tokens;
    
    if (!success && retryAfter) {
      state.backoffUntil = Date.now() + (retryAfter * 1000);
    }
    
    if (success) {
      state.consecutiveFailures = 0;
    } else {
      state.consecutiveFailures++;
      
      // Trip circuit breaker after 3 consecutive failures
      if (state.consecutiveFailures >= 3) {
        this.tripCircuitBreaker(provider, 60000); // 1 minute cooldown
      }
    }
  }

  canUseProvider(provider, requiredTokens) {
    const state = this.getOrCreateState(provider);
    const now = Date.now();
    
    // Check circuit breaker
    if (this.isCircuitBreakerOpen(provider)) {
      return { allowed: false, reason: 'circuit_breaker_open' };
    }
    
    // Check backoff
    if (state.backoffUntil && now < state.backoffUntil) {
      return { allowed: false, reason: 'backoff', retryAfter: state.backoffUntil - now };
    }
    
    // Check per-minute limits
    if (state.requestsThisMinute >= 500) {
      return { allowed: false, reason: 'requests_limit_reached' };
    }
    
    if (state.tokensThisMinute + requiredTokens >= 150000) {
      return { allowed: false, reason: 'tokens_limit_reached' };
    }
    
    return { allowed: true };
  }

  getOrCreateState(provider) {
    if (!this.providerStates.has(provider)) {
      this.providerStates.set(provider, {
        requestsThisMinute: 0,
        tokensThisMinute: 0,
        backoffUntil: null,
        consecutiveFailures: 0,
        lastReset: Date.now()
      });
    }
    
    const state = this.providerStates.get(provider);
    
    // Reset counters every minute
    if (Date.now() - state.lastReset > 60000) {
      state.requestsThisMinute = 0;
      state.tokensThisMinute = 0;
      state.lastReset = Date.now();
    }
    
    return state;
  }

  tripCircuitBreaker(provider, duration) {
    this.circuitBreakers.set(provider, {
      openedAt: Date.now(),
      duration: duration
    });
  }

  isCircuitBreakerOpen(provider) {
    const cb = this.circuitBreakers.get(provider);
    if (!cb) return false;
    
    if (Date.now() - cb.openedAt > cb.duration) {
      this.circuitBreakers.delete(provider);
      return false;
    }
    
    return true;
  }

  // Find best available provider given current load
  selectProvider(providers, requiredTokens) {
    const sorted = providers
      .map(p => ({ provider: p, ...this.canUseProvider(p, requiredTokens) }))
      .filter(p => p.allowed)
      .sort((a, b) => {
        // Prefer HolySheep (lower cost) when available
        if (a.provider === 'holysheep' && b.provider !== 'holysheep') return -1;
        if (b.provider === 'holysheep' && a.provider !== 'holysheep') return 1;
        return 0;
      });
    
    return sorted.length > 0 ? sorted[0].provider : null;
  }
}

Best Practices for Production Deployment

Building a relay router for Cursor IDE is not just about cost savings—it's about creating resilient architecture that adapts to the rapidly evolving AI provider landscape. By leveraging HolySheep AI's ¥1=$1 pricing and sub-50ms latency alongside strategic fallbacks, your development team gets both financial efficiency and reliability.

👉

Related Resources

Related Articles