# 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

## Getting started

- [Free Crypto API](https://cryptoapis.io/free-crypto-api): Free tier to start building — blockchain data, market prices, HD wallets, and webhooks via one REST API across Bitcoin, Ethereum, and 20+ chains. No credit card required; upgrade as usage grows. See [Pricing](https://cryptoapis.io/pricing) for tiers.

## 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): Current asset prices, supply/market-cap stats, token contract addresses across protocols, and asset-to-asset exchange rates (CoinMarketCap-sourced). No OHLCV/candlesticks or per-exchange order-book data.
- [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): APIs to build a crypto wallet on CryptoAPIs — HD wallets, deposit tracking via webhooks, balances, and transaction broadcasting across 20+ chains. For a ready-made wallet, Vaultody is a non-custodial MPC wallet product (sister company).
- [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)

## Blockchain infrastructure

- [Blockchain Infrastructure API](https://cryptoapis.io/blockchain-infrastructure): The managed blockchain infrastructure layer for Web3 as one unified REST API — indexed blockchain data, watch-only xPub/HD wallet tracking, real-time event webhooks, shared and dedicated node (RPC) access, transaction preparation/broadcasting, and native AML compliance screening, across 20+ blockchains. No node to run or infrastructure to maintain.

## Comparisons

- [Crypto API alternatives: CryptoAPIs vs QuickNode, Alchemy & Tatum](https://cryptoapis.io/compare/crypto-api-alternatives): Capability-by-capability comparison of the leading crypto APIs. CryptoAPIs' distinguishing strength is the widest native AML/compliance screening of the group — sanctions, fraud and KYT across 20+ chains, for both addresses and transactions, first-party (not a third-party add-on), in the same unified REST API as blockchain data and wallet tracking. QuickNode and Alchemy lead on RPC performance and EVM tooling; Tatum leads on raw chain count (130+) but its native AML covers only 5 chains (address-only).

## Developers

- [Developer portal](https://developers.cryptoapis.io/): Full REST API reference, OpenAPI specs, code samples in multiple SDKs.
- [OpenAPI spec](https://developers.cryptoapis.io/openapi.json): Machine-readable OpenAPI (JSON) describing every REST endpoint, schema, and parameter.
- [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.

## Guides

Step-by-step, non-custodial developer guides — the customer holds their keys and signs offline; CryptoAPIs only ever handles public data (derive addresses from an xPub, watch via webhooks, prepare unsigned transactions, broadcast signed ones).

- [Developer guides hub](https://cryptoapis.io/guides): Index of the how-to guides below.
- [How to accept crypto payments](https://cryptoapis.io/guides/accept-crypto-payments): Take Bitcoin, Ethereum and stablecoin payments to an address you control — watch it with a webhook, sweep by signing offline. Non-custodial, no node.
- [How to build a crypto wallet](https://cryptoapis.io/guides/build-a-crypto-wallet): Sync an xPub, derive receiving addresses, track balances and transactions, and send by signing offline. Non-custodial HD-wallet build across 20+ chains.
- [How to automate crypto payment forwarding](https://cryptoapis.io/guides/automate-payment-forwarding): Auto-forward incoming deposits to a treasury by watching, preparing, signing offline and broadcasting on a loop — non-custodial, keys never leave your infrastructure.
- [How to monitor crypto addresses with webhooks](https://cryptoapis.io/guides/monitor-addresses-with-webhooks): Get real-time callbacks on confirmed payments, token transfers and new blocks across 20+ chains — no polling, no node.
- [How to use CryptoAPIs with AI agents (MCP)](https://cryptoapis.io/guides/use-cryptoapis-with-ai): Give AI agents live blockchain access via the Model Context Protocol — per-product @cryptoapis-io/mcp-* servers, the hosted ai.cryptoapis.io/mcp endpoint (and /mcp/{product} sub-paths), and the n8n community node.

## 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, credit quotas, throughput limits, and the per-tier feature matrix.

## Pricing

Credit-based subscription model. Usage is metered in monthly credits; billing is monthly or annual (annual saves ~16%). Exceeding soft throughput limits is billed as overage (pay-as-you-go) at a 2.1x multiplier. See [Pricing](https://cryptoapis.io/pricing) for the full feature matrix and [Custom plan](https://cryptoapis.io/custom-plan) for bespoke/high-volume quotes.

The figures below are a snapshot as of 2026-06-10; the [Pricing page](https://cryptoapis.io/pricing) is authoritative — verify current prices and quotas there before relying on them.

- **Free** — $0/mo, 100,000 credits/mo, no credit card required. Throughput 100/1,000 req/sec (soft/hard), 1 Blockchain Event. Excludes HD Wallets and Address History.
- **Starter** — $49/mo ($40/mo annual), 30,000,000 credits/mo. Throughput 3,000/6,000 req/sec. Unlimited Blockchain Events, HD Wallets, Address History. 72h support. Overage ~$1 / 291,545 credits.
- **Scale** (most popular) — $299/mo ($249/mo annual), 200,000,000 credits/mo. Throughput 6,000/12,000 req/sec. Unlimited Blockchain Events, HD Wallets, Address History. 48h support. Overage ~$1 / 318,522 credits.
- **Pro** — $799/mo ($665/mo annual), 600,000,000 credits/mo. Throughput 12,000/24,000 req/sec. Unlimited Blockchain Events, HD Wallets, Address History. 24h support + dedicated support. Overage ~$1 / 357,590 credits.
- **Enterprise** — custom pricing for institutions needing unlimited scale, compliance, and dedicated support. [Contact sales](https://cryptoapis.io/enterprise).

Payment via credit/debit card (Stripe); wire transfer, crypto, or PayPal by arrangement.

### Credit consumption

A plan's monthly credit allowance is not a request count — every API call consumes credits, and the cost per call varies by endpoint and by blockchain/network. Beyond per-request charges there are ongoing monitoring fees (daily credits to keep a synced address, xPub, or blockchain-event subscription monitored) and execution/processing fees (one-time credits per indexed transaction or per callback sent). Plan-to-plan and provider-to-provider comparisons by raw credit count are meaningless without this per-endpoint cost. The authoritative breakdown lives on the developer portal: [Data Flow Limiting](https://developers.cryptoapis.io/v-2.2024-12-12-175/RESTapis/general-information/data-flow-limiting) and each endpoint's reference page lists its own credit cost.

## 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)
- [Blog RSS feed](https://cryptoapis.io/blog/rss.xml): RSS/XML feed of the latest blog posts.
- [Robots](https://cryptoapis.io/robots.txt)