x402-niche-briefs.fly.dev
Google Merchant Center `gtin`, `mpn`, `brand`, and `identifier_exists` feed attribute matrix. Pass ?condition=new|refurbished|custom_handmade (default new) & ?has_gtin=true|false (default true). Returns exact feed attribute values to submit, GS1 company-prefix cross-check rules, and fixes for 'Invalid value [gtin]' or 'Incorrect identifier_exists'.
SearchLiveeip155:8453Exactvia cdp
Google-merchant-centerGmcGtinUpcGs1
Settlements · 30d
350↑ 17300%
No per-endpoint history for this service yet, so this is payments indexed to its PROVIDER's wallet over 30 days.
$3.88
Verified settled volume
355 settlements proven x402 by their on-chain EIP-3009 marker.
$0.010
Listed price
As published in the catalog. Always read the live 402 before paying.
1
Calls · 30d
Upstream's own call count for this endpoint, not ours.
1
Unique payers · 30d
Last called 2026-10-26 00:45Z
—
Upstream on-chain volume
Reported by the source catalog.
Paid to
0x847f54ae8dDFD71ed7bC930C1f7a73576FAb03A9The 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.
Accepts
The payment requirements as published to the catalog. Read the live 402 before paying — a price here is a claim, not a quote.
0.01USDC≈ $0.01 USD
on Base · exact scheme
Pay 0.01 USDC on Base to 0x847f…b03A9. The signed payment is good for 5 minutes.
- Paid to
- 0x847f…b03A9
- USD Coin contract
- 0x8335…02913
- Payment window
- 5 minutes
- As published
- 10000 smallest units
The catalog’s raw entry
[
{
"asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
"extra": {
"name": "USD Coin",
"version": "2"
},
"payTo": "0x847f54ae8dDFD71ed7bC930C1f7a73576FAb03A9",
"amount": "10000",
"scheme": "exact",
"network": "eip155:8453",
"maxTimeoutSeconds": 300
}
]Extensions
{
"bazaar": {
"info": {
"input": {
"type": "http",
"method": "GET",
"queryParams": {
"has_gtin": "true",
"condition": "new"
}
},
"output": {
"type": "json",
"example": {
"as_of": "2026-10-25",
"inputs": {
"has_gtin": true,
"condition": "new"
},
"disclaimer": "Educational reference and automated checklist only; not legal advice.",
"critical_disapproval_rules": [
"Never buy cheap non-GS1 resold UPCs or generate random 12-digit numbers: Google cross-checks the GS1 company prefix against the submitted `brand` attribute a...",
"Never set `identifier_exists` to `no` on a mass-produced branded item just because you don't know its UPC — GMC flags that as 'Incorrect identifier_exists'."
],
"recommended_feed_attributes": {
"mpn": "Recommended alongside GTIN",
"gtin": "Required valid GS1 UPC-A (12 digits), EAN-13 (13 digits), ISBN-13, or GTIN-14 with valid Modulo-10 check digit",
"brand": "Required manufacturer brand name",
"condition": "new",
"identifier_exists": "yes"
}
}
}
},
"schema": {
"type": "object",
"$schema": "https://json-schema.org/draft/2020-12/schema",
"required": [
"input"
],
"properties": {
"input": {
"type": "object",
"required": [
"type",
"method"
],
"properties": {
"type": {
"type": "string",
"const": "http"
},
"method": {
"enum": [
"GET"
],
"type": "string"
},
"queryParams": {
"type": "object",
"required": [
"condition",
"has_gtin"
],
"properties": {
"has_gtin": {
"enum": [
"true",
"false"
],
"type": "string",
"description": "Whether the manufacturer assigned a GS1 GTIN/UPC/EAN"
},
"condition": {
"enum": [
"new",
"refurbished",
"custom_handmade"
],
"type": "string",
"description": "Product condition / custom status"
}
}
}
},
"additionalProperties": false
},
"output": {
"type": "object",
"required": [
"type"
],
"properties": {
"type": {
"type": "string"
},
"example": {
"type": "object",
"$schema": "https://json-schema.org/draft/2020-12/schema",
"required": [
"as_of",
"inputs",
"recommended_feed_attributes",
"critical_disapproval_rules",
"disclaimer"
],
"properties": {
"as_of": {
"type": "string"
},
"inputs": {
"type": "object",
"required": [
"condition",
"has_gtin"
],
"properties": {
"has_gtin": {
"type": "boolean"
},
"condition": {
"type": "string"
}
}
},
"disclaimer": {
"type": "string"
},
"critical_disapproval_rules": {
"type": "array",
"items": {
"type": "string"
}
},
"recommended_feed_attributes": {
"type": "object",
"required": [
"identifier_exists",
"brand",
"gtin",
"mpn",
"condition"
],
"properties": {
"mpn": {
"type": "string"
},
"gtin": {
"type": "string"
},
"brand": {
"type": "string"
},
"condition": {
"type": "string"
},
"identifier_exists": {
"type": "string"
}
}
}
}
}
}
}
}
}
}
}Provenance
- Seen in the source catalog
- 2026-10-26 00:45Z
- Last indexed by Roundhouse
- 2026-10-26 16:50Z
- Last enriched (probe, favicon, geo)
- 2026-10-26 08:16Z
- x402 version
- 2
- 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
No per-endpoint history for this service yet, so this is payments indexed to its PROVIDER's wallet over 30 days. Verified volume counts only settlements with an on-chain EIP-3009 marker.
Show the promptHide the prompt
Using Roundhouse, look up the x402 service x402-niche-briefs.fly.dev 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=x402-niche-briefs.fly.dev' 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-niche-briefs.fly.dev/v1/google-merchant-gtin-check, 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.