base-estimate-gas
Gas estimate for a Base mainnet swap or any other call (to/from/value/data) via eth_estimateGas, without broadcasting a transaction.
TradingLiveeip155:8453Exactvia wellknown:x402.agentindex.world
Base rpcGas estimateEth_estimateGasBase mainnetTransaction cost
Calls · 30d
3→ 0%
This endpoint's own trailing-30-day call count, as published by the upstream catalog and snapshotted daily. 30 snapshots so far.
$1.41
Verified settled volume
476 settlements proven x402 by their on-chain EIP-3009 marker.
$0.0040
Listed price
As published in the catalog. Always read the live 402 before paying.
—
Calls · 30d
Upstream's own call count for this endpoint, not ours.
—
Unique payers · 30d
Never called
—
Upstream on-chain volume
Reported by the source catalog.
Paid to
0xb3F32bdfe8D07825BC0D7387295aB1D7559BA69dThe wallet the 402 directs payment to. Its whole payment record — every payer, every chain — is on the merchant page.
Asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913
Provider
The payTo wallet does not resolve to a registered ERC-8004 agent. That is not a verdict on the service — most of the catalog is unregistered.
Live 402 challenge
Captured by the enrichment pass, not read just now. Prices can change — always read the 402 the endpoint answers with.
{
"error": "Payment required",
"accepts": [
{
"asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
"extra": {
"name": "USD Coin",
"version": "2"
},
"payTo": "0xb3F32bdfe8D07825BC0D7387295aB1D7559BA69d",
"amount": "4000",
"scheme": "exact",
"network": "eip155:8453",
"maxTimeoutSeconds": 300
}
],
"resource": {
"url": "https://x402.agentindex.world/base/estimate-gas",
"tags": [
"base rpc",
"gas estimate",
"eth_estimateGas",
"base mainnet",
"transaction cost"
],
"mimeType": "application/json",
"description": "Gas estimate for a Base mainnet swap or any other call (to/from/value/data) via eth_estimateGas, without broadcasting a transaction.",
"serviceName": "base-estimate-gas"
},
"extensions": {
"bazaar": {
"info": {
"input": {
"body": {
"to": "0xdb6882db2A406Bc1541988715842906Dfd4FD590",
"value_wei": 0,
"from_address": "0xb3F32bdfe8D07825BC0D7387295aB1D7559BA69d"
},
"type": "http",
"method": "GET",
"bodyType": "json"
},
"output": {
"type": "json",
"example": {
"to": "0xdb6882db2A406Bc1541988715842906Dfd4FD590",
"value_wei": 0,
"from_address": "0xb3F32bdfe8D07825BC0D7387295aB1D7559BA69d",
"gas_estimate": 21000
}
}
},
"schema": {
"type": "object",
"$schema": "https://json-schema.org/draft/2020-12/schema",
"required": [
"input"
],
"properties": {
"input": {
"type": "object",
"required": [
"type",
"method",
"bodyType",
"body"
],
"properties": {
"body": {
"type": "object",
"title": "EstimateGasInput",
"required": [
"to"
],
"properties": {
"to": {
"type": "string",
"title": "To"
},
"data": {
"anyOf": [
{
"type": "string"
},
{
"type": "null"
}
],
"title": "Data",
"default": null
},
"value_wei": {
"type": "integer",
"title": "Value Wei",
"default": 0
},
"from_address": {
"anyOf": [
{
"type": "string"
},
{
"type": "null"
}
],
"title": "From Address",
"default": null
}
}
},
"type": {
"type": "string",
"const": "http"
},
"method": {
"enum": [
"POST",
"PUT",
"PATCH"
],
"type": "string"
},
"bodyType": {
"enum": [
"json",
"form-data",
"text"
],
"type": "string"
}
},
"additionalProperties": false
},
"output": {
"type": "object",
"required": [
"type"
],
"properties": {
"type": {
"type": "string"
},
"example": {
"type": "object",
"title": "EstimateGasOutput",
"required": [
"to",
"from_address",
"value_wei",
"gas_estimate"
],
"properties": {
"to": {
"type": "string",
"title": "To"
},
"value_wei": {
"type": "integer",
"title": "Value Wei"
},
"from_address": {
"anyOf": [
{
"type": "string"
},
{
"type": "null"
}
],
"title": "From Address"
},
"gas_estimate": {
"type": "integer",
"title": "Gas Estimate"
}
}
}
}
}
}
}
}
},
"x402Version": 2
}Accepts
The payment requirements as published to the catalog. Read the live 402 before paying — a price here is a claim, not a quote.
0.004USDC≈ $0.004 USD
on Base · exact scheme
Pay 0.004 USDC on Base to 0xb3F3…BA69d. The signed payment is good for 5 minutes.
- Paid to
- 0xb3F3…BA69d
- USD Coin contract
- 0x8335…02913
- Payment window
- 5 minutes
- As published
- 4000 smallest units
The catalog’s raw entry
[
{
"asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
"extra": {
"name": "USD Coin",
"version": "2"
},
"payTo": "0xb3F32bdfe8D07825BC0D7387295aB1D7559BA69d",
"price": "$0.004",
"amount": "4000",
"scheme": "exact",
"network": "eip155:8453",
"maxTimeoutSeconds": 300
}
]Extensions
{
"bazaar": {
"info": {
"input": {
"body": {
"to": "0xdb6882db2A406Bc1541988715842906Dfd4FD590",
"value_wei": 0,
"from_address": "0xb3F32bdfe8D07825BC0D7387295aB1D7559BA69d"
},
"type": "http",
"bodyType": "json"
},
"output": {
"type": "json",
"example": {
"to": "0xdb6882db2A406Bc1541988715842906Dfd4FD590",
"value_wei": 0,
"from_address": "0xb3F32bdfe8D07825BC0D7387295aB1D7559BA69d",
"gas_estimate": 21000
}
}
},
"schema": {
"type": "object",
"$schema": "https://json-schema.org/draft/2020-12/schema",
"required": [
"input"
],
"properties": {
"input": {
"type": "object",
"required": [
"type",
"method",
"bodyType",
"body"
],
"properties": {
"body": {
"type": "object",
"title": "EstimateGasInput",
"required": [
"to"
],
"properties": {
"to": {
"type": "string",
"title": "To"
},
"data": {
"anyOf": [
{
"type": "string"
},
{
"type": "null"
}
],
"title": "Data",
"default": null
},
"value_wei": {
"type": "integer",
"title": "Value Wei",
"default": 0
},
"from_address": {
"anyOf": [
{
"type": "string"
},
{
"type": "null"
}
],
"title": "From Address",
"default": null
}
}
},
"type": {
"type": "string",
"const": "http"
},
"method": {
"enum": [
"POST",
"PUT",
"PATCH"
],
"type": "string"
},
"bodyType": {
"enum": [
"json",
"form-data",
"text"
],
"type": "string"
}
},
"additionalProperties": false
},
"output": {
"type": "object",
"required": [
"type"
],
"properties": {
"type": {
"type": "string"
},
"example": {
"type": "object",
"title": "EstimateGasOutput",
"required": [
"to",
"from_address",
"value_wei",
"gas_estimate"
],
"properties": {
"to": {
"type": "string",
"title": "To"
},
"value_wei": {
"type": "integer",
"title": "Value Wei"
},
"from_address": {
"anyOf": [
{
"type": "string"
},
{
"type": "null"
}
],
"title": "From Address"
},
"gas_estimate": {
"type": "integer",
"title": "Gas Estimate"
}
}
}
}
}
}
}
}
}Provenance
- Seen in the source catalog
- —
- Last indexed by Roundhouse
- 2026-10-18 13:15Z
- Last enriched (probe, favicon, geo)
- 2026-10-10 06:46Z
- x402 version
- —
- Max timeout
- 300s
- Liveness probe
- HTTP 402
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. 30 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-estimate-gas 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-estimate-gas' 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://x402.agentindex.world/base/estimate-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.