# Crypto APIs

> The blockchain infrastructure suite for Web 3.

Crypto APIs Inc. provides a blockchain infrastructure suite offering unified APIs for blockchain data, transaction processing, wallet management, blockchain events, and crypto market data. Newer additions include AML address screening (Verify Address) and Model Context Protocol servers + an n8n MCP client for AI-agent integrations. Coverage spans 20+ blockchains.

This file follows the [llms.txt convention](https://llmstxt.org). It curates the canonical entry points for an LLM-driven agent. The technical reference lives on [developers.cryptoapis.io](https://developers.cryptoapis.io); for machine-readable URL inventories see [/cryptoapis/sitemap.xml](https://cryptoapis.io/cryptoapis/sitemap.xml).

## About

- **Legal entity:** Crypto APIs INC (Delaware, United States)
- **Founded:** 2018
- **Headquarters:** 24a Trolley Square, Wilmington, DE 19806, United States
- **Contact:** [hq@cryptoapis.io](mailto:hq@cryptoapis.io)
- **Identifier:** US EIN 30-1313692

## Products

API products in the suite. Each page describes what the product does, what blockchains it supports, and links to the technical reference on the developer portal.

- [Blockchain Events](https://cryptoapis.io/products/blockchain-events): Webhook-based notifications for on-chain activity (incoming/outgoing transactions, confirmations, mined blocks, internal transactions, token transfers).
- [Block Data](https://cryptoapis.io/products/block-data): Latest and historical block data — height, hash, transactions, mining info — across UTXO, EVM, and XRP chains.
- [Blockchain Fees](https://cryptoapis.io/products/blockchain-fees): Real-time gas/fee estimation per chain (slow/standard/fast tiers) for EVM, UTXO, and XRP.
- [Broadcast Transactions](https://cryptoapis.io/products/broadcast-transactions): Submit signed transactions to any supported blockchain network.
- [Address Latest](https://cryptoapis.io/products/address-latest): Current balance, nonce, token holdings, and recent activity for any address across EVM, UTXO, Solana, Kaspa, and XRP.
- [Address History](https://cryptoapis.io/products/address-history): Full transaction history for an address with cursor-based pagination across EVM and UTXO.
- [Contracts Data](https://cryptoapis.io/products/contracts): Smart-contract reads, ABI, deployment info, and token metadata for EVM and Solana programs.
- [Dedicated Nodes](https://cryptoapis.io/products/dedicated-nodes): Single-tenant blockchain nodes with managed infrastructure, archive support, and SLAs.
- [Blockchain Utils](https://cryptoapis.io/products/blockchain-utils): Helper endpoints — address derivation, validation, signature verification, encoding utilities.
- [HD Wallets](https://cryptoapis.io/products/hd-wallets-management): Hierarchical-deterministic wallet management — generate xPubs, derive addresses, sync balances.
- [Prepare Transactions](https://cryptoapis.io/products/prepare-transactions): Server-side transaction construction with automatic fee/nonce/gas calculation for EVM.
- [Transactions Data](https://cryptoapis.io/products/transactions-data): Lookup individual transactions by hash with parsed fields, status, fees, and internal calls.
- [Market Data](https://cryptoapis.io/products/market-data): Price tickers, exchange rates, and asset metadata across major exchanges.
- [Transaction Simulator](https://cryptoapis.io/products/transaction-simulator): Simulate EVM transactions on mainnet state to predict gas, errors, and outcomes before broadcasting.
- [Verify Address](https://cryptoapis.io/products/verify-address): AML address screening — sanctions, fraud, KYT compliance — across 20+ blockchains.
- [AI Compatibility](https://cryptoapis.io/products/ai-compatibility): MCP servers and an n8n MCP client that connect Crypto APIs blockchain data to Claude, Cursor, n8n, and any MCP-compatible AI agent.
- [Node-as-a-Service](https://cryptoapis.io/products/node-as-a-service): Multi-tenant managed RPC endpoints across 20+ blockchains.
- [Wallet-as-a-Service](https://cryptoapis.io/products/wallet-as-a-service): Custodial and non-custodial wallet infrastructure with MPC, KMS, and policy controls.
- [Key Management System](https://cryptoapis.io/products/key-management-system): HSM-backed key storage with policy-based signing.
- [MPC](https://cryptoapis.io/products/wallet-as-a-service/mpc): Multi-party computation key management for wallets.

## Use Cases

Industry-specific guides for how the product suite maps to common applications.

- [Multi-currency Wallet](https://cryptoapis.io/use-cases/multi-currencies-wallet)
- [Hardware Wallet](https://cryptoapis.io/use-cases/hardware-wallet)
- [Exchanges](https://cryptoapis.io/use-cases/exchanges)
- [Payment Processors](https://cryptoapis.io/use-cases/payment-processors)
- [Banks](https://cryptoapis.io/use-cases/banks)
- [Lending](https://cryptoapis.io/use-cases/lending)
- [Custody Providers](https://cryptoapis.io/use-cases/custody-providers)
- [Crypto Taxes](https://cryptoapis.io/use-cases/crypto-taxes)
- [Portfolio Tracking](https://cryptoapis.io/use-cases/portfolio-tracking)
- [Crypto Mining](https://cryptoapis.io/use-cases/crypto-mining)
- [Block Explorer](https://cryptoapis.io/use-cases/block-explorer)
- [Market Data Applications](https://cryptoapis.io/use-cases/market-data-applications)

## Developers

- [Developer portal](https://developers.cryptoapis.io/): Full REST API reference, OpenAPI specs, code samples in multiple SDKs.
- [Technical documentation](https://developers.cryptoapis.io/technical-documentation): Concepts, architecture, authentication, rate limits.
- [Guides](https://developers.cryptoapis.io/guides): Walkthroughs for common integration patterns.
- [Glossary](https://developers.cryptoapis.io/glossary): Terms and definitions used across the API.
- [FAQ (developers)](https://developers.cryptoapis.io/faq): Common technical questions.
- [Product updates](https://updates.cryptoapis.io/): Changelog and release notes.
- [GitHub](https://github.com/Crypto-APIs): Official SDKs and code samples.

## Coverage

- [What we support](https://cryptoapis.io/what-we-support): Index of every supported blockchain, layer, token, and exchange.
- [Pricing](https://cryptoapis.io/pricing): Plans, request quotas, and feature matrix.

## Company

- [Why Crypto APIs](https://cryptoapis.io/why-cryptoapis): Positioning and differentiators.
- [Enterprise](https://cryptoapis.io/enterprise): Enterprise-tier plans, SLAs, dedicated support.
- [Customers](https://cryptoapis.io/customers): Customer logos and case-study index.
- [Security & ISO 27001](https://cryptoapis.io/security): Compliance certifications, security posture, audit information.
- [FAQ](https://cryptoapis.io/faq): General questions about the company and product.
- [Blog](https://cryptoapis.io/blog): Engineering posts, product announcements, blockchain analyses.
- [Contact](https://cryptoapis.io/contacts): Sales and support contact form.
- [Custom plan](https://cryptoapis.io/custom-plan): Request a quote for high-volume or bespoke usage.

## Legal

- [Terms & Conditions](https://cryptoapis.io/terms-conditions)
- [Privacy Policy](https://cryptoapis.io/privacy-policy)
- [Data Security Policy](https://cryptoapis.io/data-security-policy)
- [Affiliate Terms](https://cryptoapis.io/affiliate-terms)

## Social

Verified accounts for the legal entity Crypto APIs INC.

- [Twitter / X](https://twitter.com/CryptoApis)
- [LinkedIn](https://www.linkedin.com/company/cryptoapis/)
- [GitHub](https://github.com/Crypto-APIs)
- [YouTube](https://www.youtube.com/channel/UC362-hvRMaGucJGKjl7HyEQ)
- [Telegram](https://t.me/CryptoAPIs)
- [Medium](https://medium.com/cryptoapis)
- [Facebook](https://www.facebook.com/Cryptoapis.io/)
- [Reddit](https://www.reddit.com/r/CryptoAPIs/)

## Optional

Lower-priority pages an agent rarely needs to crawl.

- [Sitemap (XML index)](https://cryptoapis.io/cryptoapis/sitemap.xml)
- [Pages sitemap](https://cryptoapis.io/cryptoapis/sitemap_pages.xml)
- [Blog sitemap](https://cryptoapis.io/sitemap_blog.xml)
- [Robots](https://cryptoapis.io/robots.txt)