LogicNodes — 2,316 Deterministic AI Agent Workers

Drop-in replacement for Blocknative gas API (EOL June 19, 2026)

LogicNodes gives AI agents deterministic, pay-per-call access to 2,316 blockchain utility workers — gas estimation, USDC balances, ETH prices, signature verification, content anchoring, DeFi data, and more.

Quick Start

curl https://logicnodes.io/call/eip1559_gas_estimator \
  -H "Authorization: Bearer YOUR_API_KEY"

Get a free API key at logicnodes.io/start.

MCP Setup (Claude Desktop, Cursor, Windsurf)

Add to your claude_desktop_config.json:

{
  "mcpServers": {
    "logicnodes": {
      "command": "npx",
      "args": ["-y", "@logicnodes/mcp-server"],
      "env": {
        "LOGICNODES_API_KEY": "YOUR_API_KEY",
        "LOGICNODES_BASE_URL": "https://logicnodes.io"
      }
    }
  }
}

Config file paths:

Platform	Path
macOS	~/Library/Application Support/Claude/claude_desktop_config.json
Windows	%APPDATA%\Claude\claude_desktop_config.json
Cursor	~/.cursor/mcp.json
Windsurf	~/.codeium/windsurf/mcp_config.json

Top Workers

Worker	Description	Price
eip1559_gas_estimator	Real-time EIP-1559 gas (Base/Ethereum)	$0.001/call
usdc_balance_checker	Native USDC balance, any chain	$0.001/call
eth_price_oracle	3-source median price (Coinbase + CoinGecko + DefiLlama)	$0.001/call
signature_verifier	EIP-191/EIP-712 signature verification	$0.001/call
caas_anchor	Cryptographic content anchoring on-chain	$50 + $5/mo
a2a_escrow	Agent-to-agent escrow	0.35% fee
zk_attest	ZK attestation / proof generation	$0.01–$0.10
intent_solver	DeFi intent routing	1–3% APY

Full catalog: logicnodes.io/workers

API Examples

Gas Estimation (Blocknative replacement)

curl https://logicnodes.io/call/eip1559_gas_estimator \
  -H "Authorization: Bearer $LOGICNODES_API_KEY"
# {"baseFee": 0.052, "priorityFee": 0.001, "nextBlock": 0.053, "chain": "base"}

USDC Balance

curl "https://logicnodes.io/call/usdc_balance_checker" \
  -H "Authorization: Bearer $LOGICNODES_API_KEY" \
  -d '{"address":"0xYOUR_WALLET","chain":"base"}'

ETH Price

curl https://logicnodes.io/call/eth_price_oracle \
  -H "Authorization: Bearer $LOGICNODES_API_KEY"
# {"price": 3241.50, "source": "median", "sources": ["coinbase","coingecko","defillama"]}

Pay-Per-Call (No Account Needed)

LogicNodes supports HTTP 402 micropayments via USDC on Base. Send without an API key — the server returns a 402 Payment Required with payment details, then you pay on-chain and retry:

import httpx

resp = httpx.post("https://logicnodes.io/call/eip1559_gas_estimator")
if resp.status_code == 402:
    payment_info = resp.json()
    # Pay to payment_info["payTo"] the amount payment_info["amount"] in USDC on Base
    # Then retry with X-Payment-Receipt header

Architecture

• 2,316 workers deployed on Base (Chain ID 8453)
• Deterministic outputs — same blockchain state → same result, always
• Cryptographically signed — every response includes a signature you can verify
• x402 payments — HTTP 402 micropayment protocol on Base
• MCP bridge — full Model Context Protocol support

Links

• Homepage: https://logicnodes.io
• API Docs: https://logicnodes.io/agent-guide
• Worker Catalog: https://logicnodes.io/workers
• MCP Config: https://logicnodes.io/.well-known/mcp.json
• OpenAPI Spec: https://logicnodes.io/openapi.json
• Blocknative Migration Guide: https://logicnodes.io/blocknative
• Contact: contact@htsnavigator.com

License

MIT