alchemy-api

name alchemy-api description Wire Alchemy into application code (server, backend, dApp, script) using a standard API key. Preferred app-integration path for normal server/backend usage. Covers EVM JSON-RPC, Token API, NFT API, Transfers API, Prices API, Portfolio API, Simulation, Webhooks, Solana RPC, Solana DAS, Solana Yellowstone gRPC, Sui gRPC, Wallets/Account Kit, and operational topics. Requires `$ALCHEMY_API_KEY`. For live agent work in this session (querying, admin, local automation), use `alchemy-cli` (preferred) or `alchemy-mcp` instead. For app code without an API key (autonomous agent paying per-request, or explicit x402/MPP), use `agentic-gateway` instead. license MIT compatibility Requires network access and `$ALCHEMY_API_KEY` environment variable. Works across Claude.ai, Claude Code, Cursor, Codex, and API. metadata {"author":"alchemyplatform","version":"2.0"} Alchemy API (with API Key) Reference and integration guide for wiring Alchemy APIs into application code using a standard API key. This file alone is enough to ship a basic integration; the references/ directory contains deeper coverage of every product surface. When to use this skill Use alchemy-api when all of the following are true: The user is wiring Alchemy into application code (server, backend, dApp, worker, script) that runs outside the current agent session They have, or are willing to create, an Alchemy API key (free at dashboard.alchemy.com ) This is the preferred app-integration path for normal server/backend usage. When to use a different skill Situation Use this skill instead Live agent work in this session (queries, admin, on-machine automation) and @alchemy/cli is installed locally — or both CLI and MCP are available alchemy-cli Live agent work in this session and only MCP is wired into the client (no CLI) alchemy-mcp Live agent work and neither is available install alchemy-cli and use alchemy-cli Application code without an API key — autonomous agent paying per-request, or user explicitly wants x402/MPP agentic-gateway Do not use this skill to run ad-hoc live queries from inside the agent session — that's the alchemy-cli / alchemy-mcp path. This skill is for code that ships. Mandatory preflight gate Before writing application code or making any network call: Confirm the user is building application code (not asking the agent to run a live query). If the user is asking for live work, redirect to alchemy-cli (preferred) or alchemy-mcp . Check $ALCHEMY_API_KEY is set (e.g. echo $ALCHEMY_API_KEY ). If $ALCHEMY_API_KEY is unset or empty, take the first of these that applies: CLI bridge (recommended if @alchemy/cli is installed locally): the CLI can fetch a key from the user's Alchemy account so they never have to leave the terminal. See Bridging from the CLI to an API key below. Tell the user they can create a free API key at https://dashboard.alchemy.com/ , or Switch to the agentic-gateway skill (x402/MPP gateway, wallet-based auth, no API key needed). You MUST NOT call any keyless or public fallback (including .../v2/demo ) unless the user explicitly asks for that endpoint. No public RPC endpoints (publicnode, llamarpc, cloudflare-eth, etc.) as a fallback. Bridging from the CLI to an API key If @alchemy/cli is installed locally (verify with command -v alchemy ), use it to obtain a key without leaving the terminal and persist it to the project's .env file so it survives across terminal sessions and is available to the app at runtime. Security: NEVER echo, print, or otherwise surface the extracted API key value in conversation output. Refer to it only as $ALCHEMY_API_KEY after exporting. Treat it the same as a password. # 1. Try to read a cached key from the CLI config (read-only, safe to run non-interactively). KEY= " $(alchemy --no-interactive --json --reveal config get api-key 2>/dev/null | jq -r .value) " # 2. If empty/null (no key cached yet), run the interactive flow. # Note: auth login opens a browser and apps select shows a picker, so do NOT pass # --no-interactive here. If you already know the app id, pass it explicitly to skip # the picker: `alchemy --no-interactive --json apps select <id>`. if [ -z " $KEY " ] || [ " $KEY " = "null" ]; then alchemy auth login # opens browser; derives auth credentials alchemy --json apps select # interactive picker (omit --no-interactive so it can render) KEY= " $(alchemy --no-interactive --json --reveal config get api-key | jq -r .value) " fi # 3. Persist to the project's .env (standard practice for app code so the key # survives terminal restarts and is loaded by dotenv / framework env loaders). # Use .env.local instead if your framework expects that (e.g. Next.js). ENV_FILE= ".env" # or ".env.local" depending on the project convention touch " $ENV_FILE " if grep -q '^ALCHEMY_API_KEY=' " $ENV_FILE " ; then # Replace existing line in-place (portable across BSD/GNU sed) sed -i.bak "s|^ALCHEMY_API_KEY=.*|ALCHEMY_API_KEY= $KEY |" " $ENV_FILE " && rm " $ENV_FILE .bak" else echo "ALCHEMY_API_KEY= $KEY " >> " $ENV_FILE " fi # 4. Make sure the env file is git-ignored. grep -qxF " $ENV_FILE " .gitignore 2>/dev/null || echo " $ENV_FILE " >> .gitignore # 5. Also export to the current shell so the agent can immediately call the API. export ALCHEMY_API_KEY= " $KEY " Why we persist to .env : without it, the key is only set for the current shell session and disappears when the terminal tab closes. App code typically loads .env via dotenv (Node), python-dotenv (Python), direnv , or framework-native loaders (Next.js, Vite, Bun, Deno, Rails, etc.), so writing to .env is the canonical way to make the key durable for both npm run dev and the deployed app's local copy. Why this whole flow works: the CLI is a runtime executor ( alchemy-cli skill). When the user has it installed, you can use it to provision the credential that this app-code skill needs, write it to a place the application will load, then hand off to the rest of the alchemy-api flow. After step 5, continue with the Base URLs + auth and Quickstart below. Gotcha: if auth login succeeded but config get api-key still returns "not found," the CLI's setup status may have falsely reported complete: true with only an auth_token . Re-run alchemy --json apps select (or pass an explicit <id> with --no-interactive ) to bind a default app, then retry. See the alchemy-cli skill for the same gotcha documented under Preflight. Summary A self-contained guide for AI agents integrating Alchemy APIs using an API key. This file alone should be enough to ship a basic integration. Use the reference files for depth, edge cases, and advanced workflows. Developers can always create a free API key at https://dashboard.alchemy.com/ . Do this first Confirm app-integration scope (see Mandatory preflight gate ). Choose the right product using the Endpoint selector below. Use the Base URLs + auth table for the correct endpoint and headers. Copy a Quickstart example and test against a testnet first. Base URLs + auth (cheat sheet) Product Base URL Auth Notes Ethereum RPC (HTTPS) https://eth-mainnet.g.alchemy.com/v2/$ALCHEMY_API_KEY API key in URL Standard EVM reads and writes. Ethereum RPC (WSS) wss://eth-mainnet.g.alchemy.com/v2/$ALCHEMY_API_KEY API key in URL Subscriptions and realtime. Base RPC (HTTPS) https://base-mainnet.g.alchemy.com/v2/$ALCHEMY_API_KEY API key in URL EVM L2. Base RPC (WSS) wss://base-mainnet.g.alchemy.com/v2/$ALCHEMY_API_KEY API key in URL Subscriptions and realtime. Arbitrum RPC (HTTPS) https://arb-mainnet.g.alchemy.com/v2/$ALCHEMY_API_KEY API key in URL EVM L2. Arbitrum RPC (WSS) wss://arb-mainnet.g.alchemy.com/v2/$ALCHEMY_API_KEY API key in URL Subscriptions and realtime. BNB RPC (HTTPS) https://bnb-mainnet.g.alchemy.com/v2/$ALCHEMY_API_KEY API key in URL EVM L1. BNB RPC (WSS) wss://bnb-mainnet.g.alchemy.com/v2/$ALCHEMY_API_KEY API key in URL Subscriptions and realtime. Solana RPC (HTTPS) https://solana-mainnet.g.alchemy.com/v2/$ALCHEMY_API_KEY API key in URL Solana JSON-RPC. Solana Yellowstone gRPC https://solana-mainnet.g.alchemy.com X-Token: $ALCHEMY_API_KEY gRPC streaming (Yellowstone). Sui gRPC sui-mainnet.g.alchemy.com:443 Authorization: Bearer $ALCHEMY_API_KEY Sui gRPC API (objects, txs, balances, streaming). NFT API https://<network>.g.alchemy.com/nft/v3/$ALCHEMY_API_KEY API key in URL NFT ownership and metadata. Prices API https://api.g.alchemy.com/prices/v1/$ALCHEMY_API_KEY API key in URL Prices by symbol or address. Portfolio API https://api.g.alchemy.com/data/v1/$ALCHEMY_API_KEY API key in URL Multi-chain wallet views. Notify API https://dashboard.alchemy.com/api X-Alchemy-Token: <ALCHEMY_NOTIFY_AUTH_TOKEN> Generate token in dashboard. Endpoint selector (top tasks) You need Use this Skill / file EVM read/write JSON-RPC eth_* references/node-json-rpc.md Realtime events eth_subscribe references/node-websocket-subscriptions.md Token balances alchemy_getTokenBalances references/data-token-api.md Token metadata alchemy_getTokenMetadata references/data-token-api.md Transfers history alchemy_getAssetTransfers references/data-transfers-api.md NFT ownership GET /getNFTsForOwner references/data-nft-api.md NFT metadata GET /getNFTMetadata references/data-nft-api.md Prices (spot) GET /tokens/by-symbol references/data-prices-api.md Prices (historical) POST /tokens/historical references/data-prices-api.md Portfolio (multi-chain) POST /assets/*/by-address references/data-portfolio-apis.md Simulate tx alchemy_simulateAssetChanges references/data-simulation-api.md Create webhook POST /create-webhook references/webhooks-details.md Solana NFT data getAssetsByOwner (DAS) references/solana-das-api.md Solana realtime events (per-account / per-program / logs / tx status) accountSubscribe , programSubscribe , logsSubscribe , signatureSubscribe (PubSub WebSocket) references/solana-websocket-subscriptions.md Sui objects/txs GetObject , GetTransaction (gRPC) references/sui-grpc-objects-and-ledger.md Sui balances GetBalance , ListBalances (gRPC) references/sui-grpc-state-and-balances.md Sui checkpoints stream SubscribeCheckpoints (gRPC) references/sui-grpc-subscriptions.md One-file quickstart (copy/paste) No API key? Use the agentic-gateway skill instead. Replace API-key URLs with https://x402.alchemy.com/eth-mainnet/v2 and add Authorization: SIWE <token> (or SIWS <token> for a Solana wallet). See the agentic-gateway skill for setup. EVM JSON-RPC (read) curl -s https://eth-mainnet.g.alchemy.com/v2/ $ALCHEMY_API_KEY \ -H "Content-Type: application/json" \ -d '{"jsonrpc":"2.0","id":1,"method":"eth_blockNumber","params":[]}' Token balances curl -s https://eth-mainnet.g.alchemy.com/v2/ $ALCHEMY_API_KEY \ -H "Content-Type: application/json" \ -d '{"jsonrpc":"2.0","id":1,"method":"alchemy_getTokenBalances","params":["0x00000000219ab540356cbb839cbe05303d7705fa"]}' Transfer history curl -s https://eth-mainnet.g.alchemy.com/v2/ $ALCHEMY_API_KEY \ -H "Content-Type: application/json" \ -d '{"jsonrpc":"2.0","id":1,"method":"alchemy_getAssetTransfers","params":[{"fromBlock":"0x0","toBlock":"latest","toAddress":"0x00000000219ab540356cbb839cbe05303d7705fa","category":["erc20"],"withMetadata":true,"maxCount":"0x3e8"}]}' NFT ownership curl -s "https://eth-mainnet.g.alchemy.com/nft/v3/ $ALCHEMY_API_KEY /getNFTsForOwner?owner=0x00000000219ab540356cbb839cbe05303d7705fa" Prices (spot) curl -s "https://api.g.alchemy.com/prices/v1/ $ALCHEMY_API_KEY /tokens/by-symbol?symbols=ETH&symbols=USDC" Prices (historical) curl -s -X POST "https://api.g.alchemy.com/prices/v1/ $ALCHEMY_API_KEY /tokens/historical" \ -H "Content-Type: application/json" \ -d '{"symbol":"ETH","startTime":"2024-01-01T00:00:00Z","endTime":"2024-01-02T00:00:00Z"}' Create Notify webhook curl -s -X POST "https://dashboard.alchemy.com/api/create-webhook" \ -H "Content-Type: application/json" \ -H "X-Alchemy-Token: $ALCHEMY_NOTIFY_AUTH_TOKEN " \