# 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 a full AI-agent surface: 60 Model Context Protocol tools, a command-line interface, agent skills, and an n8n MCP client. Coverage spans 35+ networks.

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). The full text of every page on this site, concatenated into one file, is at [llms-full.txt](https://cryptoapis.io/llms-full.txt).

## 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 35+ networks. 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.
- [Offline Signer](https://cryptoapis.io/products/offline-signer): MIT-licensed npm package that signs EVM, UTXO, Tron, XRP, Kaspa and Solana transactions locally — no API call, no API key, the private key never leaves your process.
- [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 35+ networks.
- [AI Compatibility](https://cryptoapis.io/products/ai-compatibility): The AI-agent surface — 60 MCP tools across 14 domains, a 47-command CLI, agent skills, and an n8n MCP client. Connects blockchain data to Claude, Cursor, Codex, n8n and any MCP-compatible agent.
- [x402 Payments](https://cryptoapis.io/products/x402): Pay for HTTP APIs, or charge for your own, in USDC stablecoin over the open x402 protocol — non-custodial buyer, merchant and facilitator, with the client signing locally and Crypto APIs settling on-chain.
- [Node-as-a-Service](https://cryptoapis.io/products/node-as-a-service): Multi-tenant managed RPC endpoints across 35+ networks.
- [Key Management System](https://cryptoapis.io/products/key-management-system): HSM-backed key storage with policy-based signing.

## AI agents

Four ways an agent reaches Crypto APIs. All share one API key.

- [MCP servers](https://cryptoapis.io/products/ai-compatibility): 60 tools across 14 domains. Hosted at `https://ai.cryptoapis.io/mcp` (HTTP Streamable, authenticate with an `x-api-key` header), or install per-domain packages from `@cryptoapis-io/mcp`. Works with Claude Code, Claude Desktop, Cursor, VS Code Copilot and n8n.
- [Command-line interface](https://www.npmjs.com/package/@cryptoapis-io/cli): `npm i -g @cryptoapis-io/cli` — 47 commands across 19 blockchains, JSON on stdout, credit cost reported per call. `cryptoapis agent-prompt --json` emits the whole command space (every action, flag, enum and cost) so an agent composes a correct call without guessing.
- [Agent skills](https://github.com/CryptoAPIs-io/cryptoapis-skills): `npx skills add CryptoAPIs-io/cryptoapis-skills -y -g` — three skills teaching an assistant the API patterns: one for the CLI, one for MCP, one for the REST API.
- [REST API](https://developers.cryptoapis.io/openapi.json): 143 paths across 47 tags behind a single `x-api-key` header. The OpenAPI specification is the source of truth.
- [MCP tool index](https://cryptoapis.io/mcp-tools.md): every MCP tool by name and domain, with a one-line description each.

Signing is deliberately excluded from every surface: private keys are never sent to Crypto APIs and never passed on a command line. Prepare a transaction, sign it locally with [@cryptoapis-io/offline-signer](https://www.npmjs.com/package/@cryptoapis-io/offline-signer), then broadcast.

Agents can pay per request over [x402](https://cryptoapis.io/products/x402) rather than holding a subscription — the facilitator covers six chain families (EVM, Solana, Tron, XRP, UTXO, Kaspa).

## 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)
- [Crypto Accounting & Audit](https://cryptoapis.io/use-cases/crypto-accounting): Reconstruct a complete, verifiable transaction history for every address you control.
- [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 35+ networks. 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 35+ networks, 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.
- [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 35+ networks.
- [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 35+ networks — 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

- [Chains and tokens](https://cryptoapis.io/chains-and-tokens): Catalog of every supported blockchain, layer and token, each linking to its own reference page.
- [What we support](https://cryptoapis.io/what-we-support): Support status for the same catalog, including what is in development. Crypto APIs does not integrate exchange trading APIs.
- [Pricing](https://cryptoapis.io/pricing): Plans, credit quotas, throughput limits, and the per-tier feature matrix.
- [AI agents](https://cryptoapis.io/agents): What an AI agent can do on-chain — read balances and history via MCP or CLI, prepare and broadcast transactions, and pay for APIs in USDC over x402, without the agent ever holding a private key.
- [Pricing calculator](https://cryptoapis.io/pricing/calculator): Estimate monthly credits for a specific basket of endpoints on a specific chain, including address monitoring and event callbacks. The same endpoint costs a different number of credits per chain — an address balance is 30 credits on Ethereum and 510 on Bitcoin.

## 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)

## 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)