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x402-experiments Gas Price Alert Subscription
x402
x402-experiments Gas Price Alert Subscription is a paid API for AI agents from lab.paidapis.net, paid per call via x402, $0.02/call, status unknown (last checked 2026-09-15).
Registers a webhook-based gas price alert that fires when Ethereum gas prices cross a specified Gwei threshold
Price / call$0.02
Success—
StatusUnknown
How this service works
Alerting: register a one-shot webhook that fires when Ethereum gas price crosses your threshold — the server pushes to you when it happens, instead of you polling for it.
Output
Returns a JSON object with a unique alertId, current status ('active', 'fired', or 'delivery-failed'), the registered webhookUrl, thresholdGwei, condition, createdAt timestamp, and — once fired — firedAt and gasPriceGweiAtTrigger values.
Example use cases
DeFi trade trigger on low gas
“Register a webhook alert to https://mybot.example.com/trade-hook that fires when gas drops below 20 Gwei so I can time my swap cheaply.”
NFT mint gas spike protection
“Set up an alert for my endpoint https://nftapp.example.com/mint-pause that triggers if gas goes above 120 Gwei — I want to pause minting automatically.”
Developer gas cost dashboard
“Subscribe https://dashboard.myproject.io/gas-events to get notified whenever gas rises above 60 Gwei so I can update my users in real time.”
Technical details
Endpoint
POSThttps://lab.paidapis.net/api/alerts/subscribeWhen to prefer
Choose this endpoint when you need a lightweight, pay-per-alert webhook subscription for Ethereum gas price monitoring, especially in an x402-based micropayment architecture. It's ideal for blockchain automation workflows where you want to trigger actions (mints, swaps, pauses) based on real-time gas conditions without polling. Prefer this over general monitoring services if you're already using the x402 payment protocol on Base mainnet USDC.
Side effects
- Missing required fields (condition, webhookUrl, thresholdGwei) returns a 400 validation error
- Invalid webhookUrl format (non-http/https) may cause alert registration failure or delivery-failed status
- Payment failure or insufficient USDC balance causes 402 response before alert is created
- Webhook delivery failure results in status 'delivery-failed' if the target URL is unreachable when alert fires
- Threshold never crossed means alert remains in 'active' state indefinitely
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| conditionrequired | string | Either "above" or "below". |
| webhookUrlrequired | string | Public http(s) URL to POST to when the alert fires. |
| thresholdGweirequired | number | Gas price threshold in Gwei. |
Output
Schema · Response
| Field | Type | Description |
|---|---|---|
| status | string | |
| alertId | string | |
| firedAt | — | |
| condition | string | |
| createdAt | string | |
| webhookUrl | string | |
| thresholdGwei | number | |
| gasPriceGweiAtTrigger | — |
Tags
x402
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