# Services from api.cortexcloud.org on Zero

> api.cortexcloud.org serves 57 paid API services for AI agents, indexed by Zero. Each is callable per call with payment handled by Zero.

Canonical page: https://www.zero.xyz/host/api.cortexcloud.org
Live health (JSON, refreshed every minute): https://www.zero.xyz/host/api.cortexcloud.org/health.json

## Services

- [CortexCloud Batch Embeddings API](https://www.zero.xyz/c/cortexcloud-batch-embeddings-api-063c10ad/llms.txt): $0.005/call via x402. Generates vector embeddings for a batch of up to 100 text strings in a single call, returning dense float arrays compatible with OpenAI embedding format
- [CortexCloud AI Speech-to-Text (Groq Whisper)](https://www.zero.xyz/c/cortexcloud-ai-speech-to-text-groq-whisper-93d3db00/llms.txt): $0.003/call via x402. Transcribes audio to text using Groq-hosted Whisper, billed per call at $0.003 USDC via x402 micropayment protocol.
- [Cortex Cloud Web Search API](https://www.zero.xyz/c/cortex-cloud-web-search-api-c7d43d69/llms.txt): $0.03/call via x402. Searches the web using neural (semantic) or keyword modes, returning ranked results filtered by domain and date range
- [CortexCloud AI Image Generation (Flux/Stability)](https://www.zero.xyz/c/cortexcloud-ai-image-generation-flux-stability-e2deac1f/llms.txt): $0.02/call via x402. Generates AI images from text prompts using Flux or Stability models via OpenRouter, billed at $0.02 USDC per image.
- [Cortex Cloud Token Balances API](https://www.zero.xyz/c/cortex-cloud-token-balances-api-06de84cb/llms.txt): $0.004/call via x402. Fetches ERC-20 token balances for a wallet address on a specified blockchain chain using the Alchemy Token API, paid via x402 USDC on Base.
- [Cortex Cloud Token Spot Price](https://www.zero.xyz/c/cortex-cloud-token-spot-price-74ad542f/llms.txt): $0.004/call via x402. Returns the current USD spot price for a cryptocurrency token or coin, using CoinGecko (free tier) or Alchemy as fallback, paid per call via x402.
- [CortexCloud Grounded Web Search with Citations](https://www.zero.xyz/c/cortexcloud-grounded-web-search-with-citations-c5019c51/llms.txt): $0.006/call via x402. Performs grounded web search with cited results using Brave Search, paid per call via x402/USDC
- [Cortex Cloud Transaction History](https://www.zero.xyz/c/cortex-cloud-transaction-history-9c5334ca/llms.txt): $0.004/call via x402. Returns normalized, paginated transaction history for a given blockchain address using Alchemy Transfers API, paid per call in USDC via x402.
- [Cortex Cloud NFT Ownership Lookup](https://www.zero.xyz/c/cortex-cloud-nft-ownership-lookup-cea1956e/llms.txt): $0.004/call via x402. Returns all NFTs owned by a given wallet address on a specified blockchain, powered by the Alchemy NFT API, billed per call in USDC via x402.
- [CortexCloud Rerank](https://www.zero.xyz/c/cortexcloud-rerank-ae429ee8/llms.txt): $0.006/call via x402. Reranks a list of documents or passages by relevance to a query using Cohere (primary) with Jina as fallback, paid per call in USDC via x402.
- [CortexCloud Text Embedding API](https://www.zero.xyz/c/cortexcloud-text-embedding-api-62adbba2/llms.txt): $0.004/call via x402. Generates vector embeddings for one or more text strings using configurable embedding models, paid per call in USDC via x402
- [Cortex Cloud Gas Oracle](https://www.zero.xyz/c/cortex-cloud-gas-oracle-8484c5ec/llms.txt): $0.004/call via x402. Returns the current base fee and priority fee (gas price) for a specified blockchain, powered by Alchemy, via x402 micropayment.
- [Cortex Cloud Text-to-Image Generation](https://www.zero.xyz/c/cortex-cloud-text-to-image-generation-3456af52/llms.txt): $0.006/call via x402. Generates images from text prompts using SDXL or Flux models (fal.ai primary, Replicate fallback), paid per call in USDC via x402.
- [CortexCloud Text-to-Speech API](https://www.zero.xyz/c/cortexcloud-text-to-speech-api-7fb26042/llms.txt): $0.02/call via x402. Converts text input into spoken audio using a specified voice model, billed per call in USDC via x402
- [CortexCloud DeFiLlama Prices](https://www.zero.xyz/c/cortexcloud-defillama-prices-779fa8b8/llms.txt): $0.005/call via x402. Fetches current DeFi token prices from DeFiLlama via a pay-per-call x402 gateway, no API keys required
- [CortexCloud DeFiLlama Chains API](https://www.zero.xyz/c/cortexcloud-defillama-chains-api-be1f06b7/llms.txt): $0.005/call via x402. Returns a list of all blockchain chains tracked by DeFiLlama, including TVL and related on-chain data, accessible via pay-per-call USDC micropayment on Base.
- [CortexCloud DeFiLlama Yields API](https://www.zero.xyz/c/cortexcloud-defillama-yields-api-903610c4/llms.txt): $0.005/call via x402. Fetches DeFi protocol yield/APY data from DeFiLlama via a pay-per-call x402 endpoint, returning current yield opportunities across DeFi pools and protocols.
- [CortexCloud Embeddings](https://www.zero.xyz/c/cortexcloud-embeddings-5d77f2d9/llms.txt): $0.005/call via x402. Generates vector embeddings for a given text string using a specified embedding model, billed per call in USDC via x402.
- [CortexCloud Image-to-Image Transformation](https://www.zero.xyz/c/cortexcloud-image-to-image-transformation-dc6658bd/llms.txt): $0.04/call via x402. Transforms an existing image using a text prompt and AI model via a pay-per-call x402 API, returning a modified version of the input image.
- [CortexCloud Messages API (OpenAI-compatible, x402)](https://www.zero.xyz/c/cortexcloud-messages-api-openai-compatible-x402-edcfa201/llms.txt): $0.005/call via x402. Sends chat completion messages to an OpenAI-compatible LLM endpoint, paying per call in USDC on Base via x402 with no API key required.
- [CortexCloud DeFiLlama Protocols](https://www.zero.xyz/c/cortexcloud-defillama-protocols-ce8ea17e/llms.txt): $0.005/call via x402. Fetches the full list of DeFi protocols and their TVL data from DeFiLlama via a pay-per-call API using x402/USDC on Base
- [CortexCloud Image Understanding (Caption / OCR / Describe)](https://www.zero.xyz/c/cortexcloud-image-understanding-caption-ocr-describe-7993b7ec/llms.txt): $0.004/call via x402. Analyzes an image URL using Gemini vision (via OpenRouter) to generate captions, extract text via OCR, or produce a detailed description.
- [CortexCloud Chat Completions Gateway](https://www.zero.xyz/c/cortexcloud-chat-completions-gateway-69f54a8f/llms.txt): $0.005/call via x402. Provides an OpenAI-compatible chat completions endpoint that routes requests to any supported AI model, with per-call USDC micropayment billing via x402 on Base — no API keys or subscriptions required.
- [Cortex Cloud ETH Balance Lookup](https://www.zero.xyz/c/cortex-cloud-eth-balance-lookup-6577a798/llms.txt): $0.001/call via x402. Retrieves the ETH balance of a given Ethereum wallet address on the Ethereum network
- [Cortex Cloud Solana Balance Lookup](https://www.zero.xyz/c/cortex-cloud-solana-balance-lookup-bd43931e/llms.txt): $0.001/call via x402. Retrieves the SOL token balance for a given Solana wallet address, paid per-call in USDC via x402 on Base.
- [CortexCloud DeFiLlama Protocol Lookup](https://www.zero.xyz/c/cortexcloud-defillama-protocol-lookup-5014a3be/llms.txt): $0.005/call via x402. Fetches DeFiLlama protocol data (TVL, stats, metadata) for a specific DeFi protocol, payable per-call in USDC on Base via x402
- [CortexCloud QUBO/Ising Optimizer](https://www.zero.xyz/c/cortexcloud-qubo-ising-optimizer-d9c27d02/llms.txt): $0.05/call via x402. Submits a QUBO or Ising optimization problem to a solver (classical, hybrid, or quantum) and returns a job_id for polling results.
- [CortexCloud HTTP Request Automation](https://www.zero.xyz/c/cortexcloud-http-request-automation-6a409085/llms.txt): $0.004/call via x402. Executes arbitrary HTTP requests (GET, POST, PUT, DELETE, etc.) on behalf of an AI agent, returning the response, settled per-call in USDC via x402.
- [CortexCloud Audio Transcription API](https://www.zero.xyz/c/cortexcloud-audio-transcription-api-b7a13d63/llms.txt): $0.004/call via x402. Transcribes base64-encoded audio into text, paid per call in USDC via x402 with no API key required
- [Cortex Cloud Block by Number API](https://www.zero.xyz/c/cortex-cloud-block-by-number-api-3d5ec5f9/llms.txt): $0.004/call via x402. Fetches a blockchain block by number or 'latest' on a specified chain, powered by Alchemy, via x402 micropayment.
- [CortexCloud AI Chat Completion](https://www.zero.xyz/c/cortexcloud-ai-chat-completion-93a0ef65/llms.txt): $0.004/call via x402. Sends a chat message array to Gemini or GPT-4o-mini via OpenRouter and returns an AI-generated text response, paid per-call in USDC on Base via x402.
- [Cortex Cloud Gas Price API](https://www.zero.xyz/c/cortex-cloud-gas-price-api-3dc7dd32/llms.txt): $0.001/call via x402. Returns current gas price estimates (fast and standard) for the Base blockchain network
- [CortexCloud Jobs Queue (x402)](https://www.zero.xyz/c/cortexcloud-jobs-queue-x402-2a3ea193/llms.txt): $0.005/call via x402. Submits an x402 endpoint call as an asynchronous job and returns a job ID with queued status, enabling non-blocking background execution of AI and data API requests paid per-call in USDC on Base.
- [Cortex Cloud Crypto Price API](https://www.zero.xyz/c/cortex-cloud-crypto-price-api-0cdc50b9/llms.txt): $0.005/call via x402. Returns the current market price for a specified cryptocurrency, paid per call in USDC via x402 with no API key required.
- [Cortex Cloud DeFi Yields API](https://www.zero.xyz/c/cortex-cloud-defi-yields-api-e7930833/llms.txt): $0.005/call via x402. Retrieves current DeFi yield data across protocols and pools, payable per-call in USDC on Base via x402
- [Cortex Cloud FX Price Lookup](https://www.zero.xyz/c/cortex-cloud-fx-price-lookup-0ace74ef/llms.txt): $0.005/call via x402. Retrieves the current foreign exchange (FX) price for a given currency pair or asset via pay-per-call USDC micropayment
- [Cortex Cloud Ethereum RPC via x402](https://www.zero.xyz/c/cortex-cloud-ethereum-rpc-via-x402-9eaf3560/llms.txt): $0.005/call via x402. Executes Ethereum JSON-RPC calls (e.g. eth_blockNumber, eth_getBalance, eth_call) with per-call USDC micropayment on Base via x402 — no API key required.
- [CortexCloud FX History](https://www.zero.xyz/c/cortexcloud-fx-history-34adc832/llms.txt): $0.01/call via x402. Retrieves historical foreign exchange (FX) rate data for currency pairs via a pay-per-call API using USDC on Base
- [CortexCloud Research Answer API](https://www.zero.xyz/c/cortexcloud-research-answer-api-16d8c646/llms.txt): $0.012/call via x402. Answers a natural language research query by searching the web and returning sourced answers, settled per-call in USDC via x402
- [CortexCloud Token Balance Lookup](https://www.zero.xyz/c/cortexcloud-token-balance-lookup-83020748/llms.txt): $0.005/call via x402. Returns the token balance for a given wallet address on the Base blockchain network
- [CortexCloud Automation Schedule](https://www.zero.xyz/c/cortexcloud-automation-schedule-2f1fe773/llms.txt): $0.01/call via x402. Schedules a recurring or one-time HTTP callback to a specified URL using a cron expression, with configurable retries and delay, settled per-call in USDC on Base via x402.
- [CortexCloud Automation Webhook](https://www.zero.xyz/c/cortexcloud-automation-webhook-b80f7b57/llms.txt): $0.004/call via x402. Triggers an outbound webhook call to a specified URL with a custom payload and headers, settled per-call in USDC via x402
- [CortexCloud AI Gateway (x402/v1/responses)](https://www.zero.xyz/c/cortexcloud-ai-gateway-x402-v1-responses-d9b06cbe/llms.txt): $0.005/call via x402. OpenAI-compatible AI responses endpoint that routes calls to any model or data source, billed per-call in USDC on Base via x402 micropayments — no API keys or subscriptions required.
- [Cortex Cloud Crypto Price History API](https://www.zero.xyz/c/cortex-cloud-crypto-price-history-api-5948ac42/llms.txt): $0.01/call via x402. Retrieves historical price data for cryptocurrencies, payable per-call in USDC on Base via x402
- [CortexCloud Video Generation API](https://www.zero.xyz/c/cortexcloud-video-generation-api-dda94e2c/llms.txt): $0.2/call via x402. Generates AI videos from a text prompt using an OpenAI-compatible interface, paid per call in USDC via x402
- [Cortex Cloud Crypto List](https://www.zero.xyz/c/cortex-cloud-crypto-list-845c9855/llms.txt): $0.005/call via x402. Returns a list of available cryptocurrencies and their metadata from the Cortex Cloud data API
- [CortexCloud News Data API](https://www.zero.xyz/c/cortexcloud-news-data-api-6da75bcc/llms.txt): $0.02/call via x402. Fetches a list of current news articles, returning URLs and titles, paid per call in USDC on Base via x402
- [Cortex Cloud Content Search API](https://www.zero.xyz/c/cortex-cloud-content-search-api-38017404/llms.txt): $0.02/call via x402. Retrieves content items by IDs with optional full-text inclusion, paid per call in USDC via x402
- [CortexCloud Workflow Automation](https://www.zero.xyz/c/cortexcloud-workflow-automation-47ced218/llms.txt): $0.02/call via x402. Execute a multi-step automation workflow via x402, paying $0.02 USDC per call with no API keys required
- [CortexCloud Coins Search](https://www.zero.xyz/c/cortexcloud-coins-search-51304d6a/llms.txt): $0.005/call via x402. Search for cryptocurrency coins by name, symbol, or keyword via an x402 pay-per-call API
- [Cortex Cloud FX List](https://www.zero.xyz/c/cortex-cloud-fx-list-367cabbe/llms.txt): $0.005/call via x402. Lists available foreign exchange (FX) currency pairs or financial instruments supported by the Cortex Cloud API
- [CortexCloud DEX Pairs Data](https://www.zero.xyz/c/cortexcloud-dex-pairs-data-23b9eca0/llms.txt): $0.005/call via x402. Retrieves decentralized exchange (DEX) trading pair data via a pay-per-call x402 endpoint
- [CortexCloud Base Balance Lookup](https://www.zero.xyz/c/cortexcloud-base-balance-lookup-f94c2293/llms.txt): $0.005/call via x402. Retrieves the USDC or native token balance of a wallet address on the Base blockchain network
- [CortexCloud DEX Search](https://www.zero.xyz/c/cortexcloud-dex-search-209fa9a1/llms.txt): $0.005/call via x402. Searches decentralized exchange (DEX) data, returning token pairs, liquidity pools, or trading activity matching a query
- [CortexCloud Automation Transform](https://www.zero.xyz/c/cortexcloud-automation-transform-58123b28/llms.txt): $0.004/call via x402. Applies user-defined transformation rules to arbitrary data, returning a structured result settled via x402 micropayment in USDC on Base.
- [CortexCloud Data Prices Endpoint](https://www.zero.xyz/c/cortexcloud-data-prices-endpoint-755c32c8/llms.txt): $0.005/call via x402. Retrieves current pricing data for assets or instruments via CortexCloud's agent-native AI gateway with per-call USDC micropayment
- [CortexCloud Base Nonce Generator](https://www.zero.xyz/c/cortexcloud-base-nonce-generator-c7c4ac0a/llms.txt): $0.005/call via x402. Generates a cryptographic nonce on the Base blockchain for use in x402 payment authorization flows

Status and success rate cover calls made through Zero and Zero's own probes. Third-party monitors may report differently.

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