Gas Oracle API
Real-time gas prices, gwei tiers, USD cost estimates for Base and Ethereum. x402.
Open source Repository Open in the app JSON README (API)
About
Real-time gas prices, gwei tiers, USD cost estimates for Base and Ethereum. x402.
Details
- Kind
- MCP servers
- Topic
- Finance & crypto
- Publisher
- br0ski777
- Origin
- official
- Category
- ferramentas
- Transport
- sse
- Version
- 1.1.0
- Last push
- 2026-09-02T19:56:05Z
- Repository state
- ativo
- Language
- TypeScript
- License
- MIT
- Added
- 2026-08-29 03:01:43
- Updated
- 2026-08-29 03:01:43
- Origin id
io.github.Br0ski777/gas-oracle
README
# Gas Oracle API
[](https://gas-oracle.api.klymax402.com/mcp)
[](https://x402.org)
[](LICENSE)
Live gas prices with gwei tiers, USD cost estimates, and congestion level. Time your transactions perfectly. Pay-per-call via [x402](https://x402.org) (USDC on Base L2) -- no API key, no signup, no rate-limit wall.
Part of the [klymax402](https://klymax402.com) 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.):
```json
{
"mcpServers": {
"gas-oracle": {
"url": "https://gas-oracle.api.klymax402.com/mcp"
}
}
}
```
## Quickstart -- HTTP (x402)
```bash
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`](https://www.npmjs.com/package/@x402/fetch), [`x402-agent-tools`](https://www.npmjs.com/package/x402-agent-tools), ATXP) handles the 402 -> sign -> retry cycle automatically.
## Tools
| Tool | Method | Path | Price | Description |
|---|---|---|---|---|
| `gas_get_current_price` | GET | `/api/price` | $0.003 | Get current gas prices with slow/standard/fast/instant tiers |
| `gas_get_current_price` | POST | `/api/price` | $0.003 | Get 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**
| Name | Type | Required | Description |
|---|---|---|---|
| `chain` | string | no | Blockchain 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:
```json
{"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**
| Name | Type | Required | Description |
|---|---|---|---|
| `chain` | string | no | Blockchain 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:
```json
{"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](https://x402.org) -- 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](https://atxp.ai) (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.
- Catalog: https://klymax402.com/llms.txt
- Full API reference: https://klymax402.com/llms-full.txt
- Live stats: https://klymax402.com/stats
## License
MIT