base-quote
Slippage estimate, swap quote, and best DEX price on Base - compares Uniswap v2, Uniswap v3, and Aerodrome on-chain via Multicall3, returns amount received, chosen path, and price impact.
TradingLiveeip155:8453Exactvia wellknown:x402.agentindex.world
Swap quote baseBest dex price baseBase rpcUniswap aerodromeSlippage estimate
Calls · 30d
3→ 0%
This endpoint's own trailing-30-day call count, as published by the upstream catalog and snapshotted daily. 32 snapshots so far.
$1.51
Verified settled volume
563 settlements proven x402 by their on-chain EIP-3009 marker.
$0.0030
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": "3000",
"scheme": "exact",
"network": "eip155:8453",
"maxTimeoutSeconds": 300
}
],
"resource": {
"url": "https://x402.agentindex.world/base/quote",
"tags": [
"swap quote base",
"best dex price base",
"base rpc",
"uniswap aerodrome",
"slippage estimate"
],
"mimeType": "application/json",
"description": "Slippage estimate, swap quote, and best DEX price on Base - compares Uniswap v2, Uniswap v3, and Aerodrome on-chain via Multicall3, returns amount received, chosen path, and price impact.",
"serviceName": "base-quote"
},
"extensions": {
"bazaar": {
"info": {
"input": {
"body": {
"token_in": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
"amount_in": 1000000,
"token_out": "0x4200000000000000000000000000000000000006"
},
"type": "http",
"method": "GET",
"bodyType": "json"
},
"output": {
"type": "json",
"example": {
"best_dex": "uniswap_v3",
"token_in": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
"aerodrome": {
"detail": "volatile pool",
"available": true,
"amount_out": 0.000368869375130808,
"amount_out_raw": "368869375130808"
},
"amount_in": "1000000",
"token_out": "0x4200000000000000000000000000000000000006",
"uniswap_v2": {
"detail": null,
"available": true,
"amount_out": 0.000369235162467701,
"amount_out_raw": "369235162467701"
},
"uniswap_v3": {
"detail": "0.05% fee tier",
"available": true,
"amount_out": 0.000370394821572273,
"amount_out_raw": "370394821572273"
},
"decimals_in": 6,
"decimals_out": 18,
"best_amount_out": 0.000370394821572273,
"price_impact_pct": 0.01,
"best_amount_out_raw": "370394821572273"
}
}
},
"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": "QuoteInput",
"required": [
"token_in",
"token_out",
"amount_in"
],
"properties": {
"token_in": {
"type": "string",
"title": "Token In"
},
"amount_in": {
"type": "integer",
"title": "Amount In",
"exclusiveMinimum": 0
},
"token_out": {
"type": "string",
"title": "Token Out"
}
}
},
"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": "QuoteOutput",
"required": [
"token_in",
"token_out",
"amount_in",
"decimals_in",
"decimals_out",
"best_dex",
"best_amount_out_raw",
"best_amount_out",
"price_impact_pct",
"uniswap_v2",
"uniswap_v3",
"aerodrome"
],
"properties": {
"best_dex": {
"anyOf": [
{
"type": "string"
},
{
"type": "null"
}
],
"title": "Best Dex"
},
"token_in": {
"type": "string",
"title": "Token In"
},
"aerodrome": {
"type": "object",
"title": "DexQuote",
"required": [
"available",
"amount_out_raw",
"amount_out",
"detail"
],
"properties": {
"detail": {
"anyOf": [
{
"type": "string"
},
{
"type": "null"
}
],
"title": "Detail"
},
"available": {
"type": "boolean",
"title": "Available"
},
"amount_out": {
"anyOf": [
{
"type": "number"
},
{
"type": "null"
}
],
"title": "Amount Out"
},
"amount_out_raw": {
"anyOf": [
{
"type": "string"
},
{
"type": "null"
}
],
"title": "Amount Out Raw"
}
}
},
"amount_in": {
"type": "string",
"title": "Amount In"
},
"token_out": {
"type": "string",
"title": "Token Out"
},
"uniswap_v2": {
"type": "object",
"title": "DexQuote",
"required": [
"available",
"amount_out_raw",
"amount_out",
"detail"
],
"properties": {
"detail": {
"anyOf": [
{
"type": "string"
},
{
"type": "null"
}
],
"title": "Detail"
},
"available": {
"type": "boolean",
"title": "Available"
},
"amount_out": {
"anyOf": [
{
"type": "number"
},
{
"type": "null"
}
],
"title": "Amount Out"
},
"amount_out_raw": {
"anyOf": [
{
"type": "string"
},
{
"type": "null"
}
],
"title": "Amount Out Raw"
}
}
},
"uniswap_v3": {
"type": "object",
"title": "DexQuote",
"required": [
"available",
"amount_out_raw",
"amount_out",
"detail"
],
"properties": {
"detail": {
"anyOf": [
{
"type": "string"
},
{
"type": "null"
}
],
"title": "Detail"
},
"available": {
"type": "boolean",
"title": "Available"
},
"amount_out": {
"anyOf": [
{
"type": "number"
},
{
"type": "null"
}
],
"title": "Amount Out"
},
"amount_out_raw": {
"anyOf": [
{
"type": "string"
},
{
"type": "null"
}
],
"title": "Amount Out Raw"
}
}
},
"decimals_in": {
"type": "integer",
"title": "Decimals In"
},
"decimals_out": {
"type": "integer",
"title": "Decimals Out"
},
"best_amount_out": {
"anyOf": [
{
"type": "number"
},
{
"type": "null"
}
],
"title": "Best Amount Out"
},
"price_impact_pct": {
"anyOf": [
{
"type": "number"
},
{
"type": "null"
}
],
"title": "Price Impact Pct"
},
"best_amount_out_raw": {
"anyOf": [
{
"type": "string"
},
{
"type": "null"
}
],
"title": "Best Amount Out Raw"
}
}
}
}
}
}
}
}
},
"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.
0.003USDC≈ $0.003 USD
on Base · exact scheme
Pay 0.003 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
- 3000 smallest units
The catalog’s raw entry
[
{
"asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
"extra": {
"name": "USD Coin",
"version": "2"
},
"payTo": "0xb3F32bdfe8D07825BC0D7387295aB1D7559BA69d",
"price": "$0.003",
"amount": "3000",
"scheme": "exact",
"network": "eip155:8453",
"maxTimeoutSeconds": 300
}
]Extensions
{
"bazaar": {
"info": {
"input": {
"body": {
"token_in": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
"amount_in": 1000000,
"token_out": "0x4200000000000000000000000000000000000006"
},
"type": "http",
"bodyType": "json"
},
"output": {
"type": "json",
"example": {
"best_dex": "uniswap_v3",
"token_in": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
"aerodrome": {
"detail": "volatile pool",
"available": true,
"amount_out": 0.000368869375130808,
"amount_out_raw": "368869375130808"
},
"amount_in": "1000000",
"token_out": "0x4200000000000000000000000000000000000006",
"uniswap_v2": {
"detail": null,
"available": true,
"amount_out": 0.000369235162467701,
"amount_out_raw": "369235162467701"
},
"uniswap_v3": {
"detail": "0.05% fee tier",
"available": true,
"amount_out": 0.000370394821572273,
"amount_out_raw": "370394821572273"
},
"decimals_in": 6,
"decimals_out": 18,
"best_amount_out": 0.000370394821572273,
"price_impact_pct": 0.01,
"best_amount_out_raw": "370394821572273"
}
}
},
"schema": {
"type": "object",
"$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": "QuoteInput",
"required": [
"token_in",
"token_out",
"amount_in"
],
"properties": {
"token_in": {
"type": "string",
"title": "Token In"
},
"amount_in": {
"type": "integer",
"title": "Amount In",
"exclusiveMinimum": 0
},
"token_out": {
"type": "string",
"title": "Token Out"
}
}
},
"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": "QuoteOutput",
"required": [
"token_in",
"token_out",
"amount_in",
"decimals_in",
"decimals_out",
"best_dex",
"best_amount_out_raw",
"best_amount_out",
"price_impact_pct",
"uniswap_v2",
"uniswap_v3",
"aerodrome"
],
"properties": {
"best_dex": {
"anyOf": [
{
"type": "string"
},
{
"type": "null"
}
],
"title": "Best Dex"
},
"token_in": {
"type": "string",
"title": "Token In"
},
"aerodrome": {
"type": "object",
"title": "DexQuote",
"required": [
"available",
"amount_out_raw",
"amount_out",
"detail"
],
"properties": {
"detail": {
"anyOf": [
{
"type": "string"
},
{
"type": "null"
}
],
"title": "Detail"
},
"available": {
"type": "boolean",
"title": "Available"
},
"amount_out": {
"anyOf": [
{
"type": "number"
},
{
"type": "null"
}
],
"title": "Amount Out"
},
"amount_out_raw": {
"anyOf": [
{
"type": "string"
},
{
"type": "null"
}
],
"title": "Amount Out Raw"
}
}
},
"amount_in": {
"type": "string",
"title": "Amount In"
},
"token_out": {
"type": "string",
"title": "Token Out"
},
"uniswap_v2": {
"type": "object",
"title": "DexQuote",
"required": [
"available",
"amount_out_raw",
"amount_out",
"detail"
],
"properties": {
"detail": {
"anyOf": [
{
"type": "string"
},
{
"type": "null"
}
],
"title": "Detail"
},
"available": {
"type": "boolean",
"title": "Available"
},
"amount_out": {
"anyOf": [
{
"type": "number"
},
{
"type": "null"
}
],
"title": "Amount Out"
},
"amount_out_raw": {
"anyOf": [
{
"type": "string"
},
{
"type": "null"
}
],
"title": "Amount Out Raw"
}
}
},
"uniswap_v3": {
"type": "object",
"title": "DexQuote",
"required": [
"available",
"amount_out_raw",
"amount_out",
"detail"
],
"properties": {
"detail": {
"anyOf": [
{
"type": "string"
},
{
"type": "null"
}
],
"title": "Detail"
},
"available": {
"type": "boolean",
"title": "Available"
},
"amount_out": {
"anyOf": [
{
"type": "number"
},
{
"type": "null"
}
],
"title": "Amount Out"
},
"amount_out_raw": {
"anyOf": [
{
"type": "string"
},
{
"type": "null"
}
],
"title": "Amount Out Raw"
}
}
},
"decimals_in": {
"type": "integer",
"title": "Decimals In"
},
"decimals_out": {
"type": "integer",
"title": "Decimals Out"
},
"best_amount_out": {
"anyOf": [
{
"type": "number"
},
{
"type": "null"
}
],
"title": "Best Amount Out"
},
"price_impact_pct": {
"anyOf": [
{
"type": "number"
},
{
"type": "null"
}
],
"title": "Price Impact Pct"
},
"best_amount_out_raw": {
"anyOf": [
{
"type": "string"
},
{
"type": "null"
}
],
"title": "Best Amount Out Raw"
}
}
}
}
}
}
}
}
}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. 32 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-quote 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-quote' 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/quote, 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.