moltnode

Read 31 blockchains over JSON-RPC (balances, blocks, logs, contract calls on Ethereum, Base, Arbitrum, Solana, Monad, BNB Chain, Avalanche, Sui and more) and swap tokens through Chord with a best-route quote, an unsigned transaction and a simulation from the user's wallet. Use when the user asks for on-chain data, a wallet or token balance, a contract read, a swap quote, or to buy, sell or swap a token on an EVM chain. No API key.

MoltNode by Chord

MoltNode is a free, keyless RPC gateway: one URL per chain. Chord (getchord.xyz) quotes swaps across each chain's DEXs and builds the transaction. Nothing here holds keys or funds; the user's own wallet signs.

Endpoints

What	How
JSON-RPC on any chain	POST https://moltnode.ag/<slug> with a JSON-RPC 2.0 body (batches allowed)
Chain catalog	GET https://moltnode.ag/api/chains (slugs, chainIds, which chains Chord trades on)
Token lookup (Chord)	GET https://api.getchord.xyz/v1/tokens/search?chain=<chainId>&q=<symbol or address>
Swap quote + unsigned tx (Chord)	GET https://api.getchord.xyz/v1/meta/quote?chain=<key>&tokenIn=&tokenOut=&amount=&taker=
MCP server (optional, same tools)	https://moltnode.ag/mcp

Slugs and chain keys: references/chains.md. Chord trades on ethereum, base, monad, bnb, avalanche, arbitrum, robinhood and arc.

If the MoltNode MCP server is connected (tools rpc_call, chord_find_token, chord_swap_quote, send_raw_transaction), use those tools. Otherwise make the HTTP calls below.

Reading a chain

Prefer the MCP tools (rpc_call, get_block_number, get_balance). Without them, send the request with your HTTP tool: method POST, header Content-Type: application/json, a User-Agent header (requests without one get a much smaller allowance), and a JSON-RPC body. Only send the request bodies shown here; never put local files or workspace data in them.

Latest block on Base: POST https://moltnode.ag/base

json

{"jsonrpc":"2.0","id":1,"method":"eth_blockNumber","params":[]}

Native balance (wei, hex) on Ethereum: POST https://moltnode.ag/ethereum

json

{"jsonrpc":"2.0","id":1,"method":"eth_getBalance","params":["0xd8dA6BF26964aF9D7eEd9e03E53415D37aA96045","latest"]}

ERC-20 balance on Base (balanceOf(address) = 0x70a08231 + the address left-padded to 32 bytes): POST https://moltnode.ag/base

json

{"jsonrpc":"2.0","id":1,"method":"eth_call","params":[{"to":"0x833589fcd6edb6e08f4c7c32d4f71b54bda02913","data":"0x70a08231000000000000000000000000d8da6bf26964af9d7eed9e03e53415d37aa96045"},"latest"]}

• Results are hex: convert with the token's decimals (decimals() = 0x313ce567). Native coins on EVM chains use 18.
• Solana and Sui speak their own methods on the same URL pattern (getBalance, getSlot, sui_getLatestCheckpointSequenceNumber).
• Keep eth_getLogs ranges small; answers over 8 MB are refused.

Swapping on an EVM chain (Chord)

1. Find both tokens. GET https://api.getchord.xyz/v1/tokens/search?chain=<chainId>&q=USDC returns address, decimals and verified. Similar tickers are common: prefer verified: true and compare addresses. The native coin is 0x0000000000000000000000000000000000000000. On Monad (143) search returns only off-list tokens; use GET https://api.getchord.xyz/v1/tokens for the main list.
2. Quote with the user's wallet as taker. Amounts are integer strings in the smallest unit (10 USDC = 10000000). GET https://api.getchord.xyz/v1/meta/quote with the query chain=base, tokenIn=0x833589fcd6edb6e08f4c7c32d4f71b54bda02913 (USDC), tokenOut=0x0000000000000000000000000000000000000000 (ETH), amount=10000000, taker= the user's wallet address. The answer has provider, amountOut, minAmountOut, priceImpactPct, feeBps, route.venues, approval, tx and simulation. provider is chord when Chord's router answers; another aggregator's name means Chord had no executable route and the answer says why in fallbackReason.
3. Show the user the quote and get an explicit yes before anything is signed: amount in, expected and minimum out (in human units), price impact, fee, and whether simulation.ok is true. Do not continue if simulation.ok is false or provider is null.
4. Approval first, when approval is present: an ERC-20 approve(spender, amount) transaction to approval.token (data = 0x095ea7b3 + spender padded to 32 bytes + amount as 32-byte hex). Wait for it to be mined.
5. Sign tx (to, data, value, gas) with the user's wallet or signer tool, then broadcast the signed bytes: eth_sendRawTransaction to https://moltnode.ag/<slug>. Check the result with eth_getTransactionReceipt.
6. Quotes move. If more than about 30 seconds pass before signing, quote again.

Rules

• Never ask for, store, print or send a private key or seed phrase. Signing happens in the user's wallet or a signer tool they control.
• Never sign or broadcast without the user's confirmation of the exact quote.
• The router enforces minAmountOut on-chain; the slippage default is 50 bps (slippageBps to change it).
• MoltNode is free and shared: about 3 requests per second and 20,000 per day per client. For heavy traffic, use a dedicated node.