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Gas Oracle API

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Real-time gas prices, gwei tiers, USD cost estimates for Base and Ethereum. x402.

Code source Site web Documentation

Installation

Ajoutez ceci à la configuration MCP de votre client (Claude Desktop : claude_desktop_config.json ; Cursor : .cursor/mcp.json ; VS Code et les autres utilisent la même forme « mcpServers »).

Remote (sse)
Claude Code 
claude mcp add --transport sse gas-oracle-api 'https://gas-oracle.api.klymax402.com/mcp'
Configuration JSON (Claude Desktop, Cursor, VS Code) 
{
    "mcpServers": {
        "gas-oracle-api": {
            "type": "sse",
            "url": "https://gas-oracle.api.klymax402.com/mcp"
        }
    }
}

Documentation

Tirée du README du projet sur GitHub, actualisée chaque semaine. Les liens ouvrent GitHub.

Sommaire
  1. Gas Oracle API
  2. Quickstart -- MCP
  3. Quickstart -- HTTP (x402)
  4. Tools
  5. Example agent prompts
  6. Payment
  7. Part of klymax402
  8. License

Gas Oracle API

Live gas prices with gwei tiers, USD cost estimates, and congestion level. Time your transactions perfectly. Pay-per-call via x402 (USDC on Base L2) -- no API key, no signup, no rate-limit wall.

Part of the klymax402 marketplace -- 100 x402 micropayment APIs for AI agents, one wallet, USDC on Base.

Quickstart -- MCP

Add to your MCP client config (Claude Desktop, Cursor, ElizaOS, etc.):

{
  "mcpServers": {
    "gas-oracle": {
      "url": "https://gas-oracle.api.klymax402.com/mcp"
    }
  }
}

Quickstart -- HTTP (x402)

curl "https://gas-oracle.api.klymax402.com/api/price"
# -> 402 Payment Required, with an x402 payment challenge in the response body

Any x402-aware client (@x402/fetch, x402-agent-tools, ATXP) handles the 402 -> sign -> retry cycle automatically.

Tools

ToolMethodPathPriceDescription
gas_get_current_priceGET/api/price$0.003Get current gas prices with slow/standard/fast/instant tiers
gas_get_current_pricePOST/api/price$0.003Get current gas prices with slow/standard/fast/instant tiers (POST variant)
gas_get_current_price

Use this when you need current gas prices before submitting a transaction. Returns gas tiers and USD cost estimates in JSON.

Parameters

NameTypeRequiredDescription
chainstringnoBlockchain network (default: base)

Returns

  • slow -- gas price in gwei for slow confirmation (~5 min)
  • standard -- gas price in gwei for standard confirmation (~2 min)
  • fast -- gas price in gwei for fast confirmation (~30s)
  • instant -- gas price in gwei for instant confirmation
  • transferCostUsd -- estimated USD cost for a simple ETH transfer
  • swapCostUsd -- estimated USD cost for a token swap
  • congestion -- network congestion level (low/medium/high)

Example response:

{"slow":0.008,"standard":0.012,"fast":0.018,"instant":0.025,"transferCostUsd":0.02,"swapCostUsd":0.05,"congestion":"low","chain":"base"}

When to use: submitting any on-chain transaction to pick the right gas tier. Essential for timing transactions and avoiding high-gas periods.

Not for: swap quotes (use dex_get_swap_quote), wallet balance (use wallet_get_portfolio).

gas_get_current_price

Use this when you need current gas prices before submitting a transaction. Returns gas tiers and USD cost estimates in JSON. POST variant of gas_get_current_price -- same params passed as JSON body instead of query string.

Parameters

NameTypeRequiredDescription
chainstringnoBlockchain network (default: base)

Returns

  • slow -- gas price in gwei for slow confirmation (~5 min)
  • standard -- gas price in gwei for standard confirmation (~2 min)
  • fast -- gas price in gwei for fast confirmation (~30s)
  • instant -- gas price in gwei for instant confirmation
  • transferCostUsd -- estimated USD cost for a simple ETH transfer
  • swapCostUsd -- estimated USD cost for a token swap
  • congestion -- network congestion level (low/medium/high)

Example response:

{"slow":0.008,"standard":0.012,"fast":0.018,"instant":0.025,"transferCostUsd":0.02,"swapCostUsd":0.05,"congestion":"low","chain":"base"}

When to use: submitting any on-chain transaction to pick the right gas tier. Essential for timing transactions and avoiding high-gas periods.

Not for: swap quotes (use dex_get_swap_quote), wallet balance (use wallet_get_portfolio).

Example agent prompts

  • "Current gas prices before submitting a transaction"
  • "Current gas prices before submitting a transaction"

Payment

  • Protocol: x402 -- HTTP-native pay-per-call, no signup, no API key
  • Network: Base L2 (eip155:8453)
  • Asset: USDC
  • Facilitator: Coinbase CDP (primary), PayAI (fallback)
  • Also reachable via ATXP (OAuth-wrapped x402, RFC 9728 protected-resource metadata)

Part of klymax402

100 x402 micropayment APIs for AI agents -- one wallet, USDC on Base, zero signup.

License

MIT

Questions fréquentes

Qu'est-ce que Gas Oracle API ?

Real-time gas prices, gwei tiers, USD cost estimates for Base and Ethereum. x402.

Comment installer Gas Oracle API ?

Il fonctionne comme serveur distant. Dans Claude Code : claude mcp add --transport sse gas-oracle-api 'https://gas-oracle.api.klymax402.com/mcp'. Pour les autres clients, collez la configuration JSON de cette page dans leurs réglages MCP.

Faut-il une clé API pour Gas Oracle API ?

Son entrée au registre n'indique aucune clé ni secret obligatoire. Certaines fonctions peuvent tout de même demander un compte auprès du service auquel il se connecte.

Gas Oracle API est-il open source ?

Oui. Son code est sur GitHub sous licence MIT.

Qui maintient Gas Oracle API ?

Il est publié par Br0ski777. AI.tn le référence sans le maintenir ni le recommander.

Issu du registre MCP officiel. Être listé n'est pas une recommandation : vérifiez le code et les permissions d'un serveur avant de lui donner accès à vos données.