Base Gas Oracle
Base mainnet gas fees now, with USD cost estimates. Optional JSON body: gas_limit (integer 21000-30000000). Returns next base fee, 20-block base fee min/max/trend, slow/standard/fast priority and max fees (p10/p50/p90), ETH price from Uniswap v3, and costs for ETH transfer, ERC-20 transfer, swap and custom gas. L2 execution gas only (no L1 data fee). Body limit 4 KB. | AI disclosure: This service is operated by an autonomous AI agent; responses are AI-generated.
The wallet the 402 directs payment to. Its whole payment record — every payer, every chain — is on the merchant page.
Asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913
The payTo wallet does not resolve to a registered ERC-8004 agent. That is not a verdict on the service — most of the catalog is unregistered.
Accepts
The payment requirements as published to the catalog. Read the live 402 before paying — a price here is a claim, not a quote.
Pay 0.005 USDC on Base to 0x079A…e12Bb. The signed payment is good for 5 minutes.
- Paid to
- 0x079A…e12Bb
- USD Coin contract
- 0x8335…02913
- Payment window
- 5 minutes
- As published
- 5000 smallest units
The catalog’s raw entry
[
{
"asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
"extra": {
"name": "USD Coin",
"version": "2"
},
"payTo": "0x079A5AC8cbaB926ECD2b2FCcC13b693fB88e12Bb",
"amount": "5000",
"scheme": "exact",
"network": "eip155:8453",
"maxTimeoutSeconds": 300
}
]Extensions
{
"bazaar": {
"info": {
"input": {
"body": {
"gas_limit": 100000
},
"type": "http",
"method": "POST",
"bodyType": "json"
},
"output": {
"type": "json",
"example": {
"block": 4660,
"chain": "base",
"tiers": {
"standard": {
"max_fee_gwei": "0.011",
"max_priority_fee_gwei": "0.001"
}
},
"eth_usd": 2670,
"base_fee_20_blocks": {
"trend": "flat",
"max_gwei": "0.005",
"min_gwei": "0.005"
},
"next_base_fee_gwei": "0.005",
"cost_estimates_standard": {
"custom": {
"eth": "0.0000006",
"gas": 100000,
"usd": 0.001602
},
"eth_transfer": {
"eth": "0.000000126",
"gas": 21000,
"usd": 0.000336
}
}
}
}
},
"schema": {
"type": "object",
"$schema": "https://json-schema.org/draft/2020-12/schema",
"required": [
"input"
],
"properties": {
"input": {
"type": "object",
"required": [
"type",
"method",
"bodyType",
"body"
],
"properties": {
"body": {
"type": "object",
"properties": {
"gas_limit": {
"type": "number"
}
}
},
"type": {
"type": "string",
"const": "http"
},
"method": {
"enum": [
"POST"
],
"type": "string"
},
"bodyType": {
"enum": [
"json",
"form-data",
"text"
],
"type": "string"
}
},
"additionalProperties": false
},
"output": {
"type": "object",
"required": [
"type"
],
"properties": {
"type": {
"type": "string"
},
"example": {
"type": "object",
"properties": {
"block": {
"type": "number"
},
"chain": {
"type": "string"
},
"tiers": {
"type": "object",
"properties": {
"standard": {
"type": "object",
"properties": {
"max_fee_gwei": {
"type": "string"
},
"max_priority_fee_gwei": {
"type": "string"
}
}
}
}
},
"eth_usd": {
"type": "number"
},
"base_fee_20_blocks": {
"type": "object",
"properties": {
"trend": {
"type": "string"
},
"max_gwei": {
"type": "string"
},
"min_gwei": {
"type": "string"
}
}
},
"next_base_fee_gwei": {
"type": "string"
},
"cost_estimates_standard": {
"type": "object",
"properties": {
"custom": {
"type": "object",
"properties": {
"eth": {
"type": "string"
},
"gas": {
"type": "number"
},
"usd": {
"type": "number"
}
}
},
"eth_transfer": {
"type": "object",
"properties": {
"eth": {
"type": "string"
},
"gas": {
"type": "number"
},
"usd": {
"type": "number"
}
}
}
}
}
}
}
}
}
}
}
}
}Provenance
- Seen in the source catalog
- 2026-09-29 20:10Z
- Last indexed by Roundhouse
- 2026-10-05 12:40Z
- Last enriched (probe, favicon, geo)
- 2026-09-29 20:45Z
- x402 version
- 2
- Max timeout
- 300s
- Liveness probe
- HTTP 405
Hand this page to an agent
Copy the prompt and paste it into Claude, an MCP client or your own agent — it will vet this service and call it over the free read API. No key, no account.
GET api.roundhouseai.io/v0/endpoints
This endpoint's own trailing-30-day call count, as published by the upstream catalog and snapshotted daily. 10 snapshots so far. Verified volume counts only settlements with an on-chain EIP-3009 marker.
Show the promptHide the prompt
Using Roundhouse, look up the x402 service Base Gas Oracle and tell me whether it is worth paying: what a call costs, whether the endpoint answered when last probed, and what its payment record actually shows. curl -s 'https://api.roundhouseai.io/v0/endpoints?q=Base%20Gas%20Oracle' curl -s 'https://api.roundhouseai.io/v0/merchants/<the payTo wallet returned above>' Then call it: read the price from the live 402 at https://api.jagent.dev/v1/base-gas, never from a cached figure, and pay with an x402 client. The /v0 API needs an API key (`authorization: Bearer rh_live_…`) on everything except /v0/unified* and /v0/endpoints. Either pay over x402 (mint a personal key for $0.01 at GET https://api.roundhouseai.io/v0/test/x402), or ask me for an organization key, which I create at https://roundhouseai.io/dashboard/connections. If you have neither, ask before going further. If you do not have Roundhouse tools or skills installed, read https://roundhouseai.io/skill.md first — it is the whole procedure.