Quant Agent Shop
Cited research answer. Send one question; returns a 120 to 300 word answer with numbered [n] citations and the source URLs read, each with the time it was read. Searches the web, or reads only the urls you pass. Suited to an agent that needs a sourced answer it can show a person. Not for raw result lists or pages behind logins. Typical response 5 to 12 s. Failed calls are not charged.
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 0.009 USDC on Base to 0x4d8d…38309. The signed payment is good for 2 minutes.
- Paid to
- 0x4d8d…38309
- USD Coin contract
- 0x8335…02913
- Payment window
- 2 minutes
- As published
- 9000 smallest units
The catalog’s raw entry
[
{
"asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
"extra": {
"name": "USD Coin",
"version": "2"
},
"payTo": "0x4d8d8D4f04512029172e0176744Eec4AE5238309",
"amount": "9000",
"scheme": "exact",
"network": "eip155:8453",
"maxTimeoutSeconds": 120
}
]Extensions
{
"bazaar": {
"info": {
"input": {
"body": {
"question": "What fee does the Coinbase CDP facilitator charge per x402 payment?",
"max_sources": 3
},
"type": "http",
"method": "POST",
"bodyType": "json"
},
"output": {
"type": "json",
"example": {
"answer": "The first 1,000 payments a month are free, then each costs $0.001 [1].",
"sources": [
{
"n": 1,
"url": "https://docs.cdp.coinbase.com/x402/welcome",
"cited": true,
"title": "x402",
"read_at": "2026-10-22T09:00:00+00:00"
}
],
"question": "What fee does the Coinbase CDP facilitator charge per x402 payment?"
}
}
},
"schema": {
"type": "object",
"$schema": "https://json-schema.org/draft/2020-12/schema",
"required": [
"input"
],
"properties": {
"input": {
"type": "object",
"required": [
"type",
"method",
"bodyType",
"body"
],
"properties": {
"body": {
"type": "object",
"required": [
"question"
],
"properties": {
"urls": {
"anyOf": [
{
"type": "array",
"items": {
"type": "string",
"format": "uri",
"maxLength": 2083,
"minLength": 1
},
"maxItems": 8
},
{
"type": "null"
}
],
"title": "Urls",
"default": null,
"description": "Optional pages to answer from instead of searching."
},
"question": {
"type": "string",
"title": "Question",
"maxLength": 500,
"minLength": 10,
"description": "One question in plain language."
},
"max_sources": {
"type": "integer",
"title": "Max Sources",
"default": 3,
"maximum": 8,
"minimum": 1,
"description": "How many sources to read, 1 to 8."
}
},
"additionalProperties": false
},
"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"
}
}
}
}
}
}
}Provenance
- Seen in the source catalog
- 2026-10-26 08:51Z
- Last indexed by Roundhouse
- 2026-10-26 22:40Z
- Last enriched (probe, favicon, geo)
- 2026-10-22 11:16Z
- x402 version
- 2
- Max timeout
- 120s
- 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. 6 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 Quant Agent Shop 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=Quant%20Agent%20Shop' 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://quantagentshop.com/v1/research-answer, 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.