LogicNodes
Gas price estimates for 14 EVM chains, built for AI agents and developers. Responses follow the Blocknative blockprices format, so existing integrations keep working.
FreeNo API keyMCPA2AERC-8004 agent #55092
Quick start
curl "https://logicnodes.io/gasprices/blockprices?chainid=8453"Parameters: chainid (default 1) and confidenceLevels (comma-separated or repeated, 1-99, default 99,95,90,80,70).
curl "https://logicnodes.io/gasprices/blockprices?chainid=1&confidenceLevels=70,90,99"Endpoints
| Path | What it does |
|---|---|
GET /gasprices/blockprices | Gas estimates, Blocknative-compatible |
GET /a2a/health | Service status and per-chain data freshness |
/mcp | MCP server (Streamable HTTP) |
/sse | MCP server (legacy SSE) |
POST /a2a | A2A JSON-RPC (message/send) |
GET /.well-known/agent-card.json | A2A agent card |
GET /.well-known/erc8004-registration.json | ERC-8004 registration file |
GET /openapi.json, /llms.txt | Machine-readable docs |
Supported chains
| Chain | chainid | Native | Fee model |
|---|---|---|---|
| Ethereum | 1 | ETH | EIP-1559 |
| Base | 8453 | ETH | EIP-1559 |
| Arbitrum One | 42161 | ETH | EIP-1559 |
| OP Mainnet | 10 | ETH | EIP-1559 |
| Polygon PoS | 137 | POL | EIP-1559 |
| BNB Chain | 56 | BNB | legacy |
| Avalanche C-Chain | 43114 | AVAX | EIP-1559 |
| Linea | 59144 | ETH | EIP-1559 |
| Scroll | 534352 | ETH | EIP-1559 |
| zkSync Era | 324 | ETH | legacy |
| Gnosis | 100 | xDAI | EIP-1559 |
| Blast | 81457 | ETH | EIP-1559 |
| Mantle | 5000 | MNT | EIP-1559 |
| Celo | 42220 | CELO | EIP-1559 |
Data refreshes in the background every few seconds and is served from memory. If a chain's data goes stale you get a clean 503 JSON error, not a timeout.
For agents
MCP: connect to https://logicnodes.io/mcp. Tools: get_gas_prices, list_supported_chains.
{ "mcpServers": { "logicnodes": { "url": "https://logicnodes.io/mcp" } } }A2A: fetch the agent card. On-chain identity: ERC-8004 agent #55092 on Base.
Payments
Fair use: 120 requests per minute per IP (HTTP 429 with Retry-After beyond that). Everything above is free today. Premium pay-per-call endpoints using x402 (USDC on Base) are planned.