PowaHub
Provides market value prices for numismatic coins.
TradingLiveeip155:8453Exactvia cdp
NumismaticsMarket_valueValuationCoin_prices
Calls · 30d
8
This endpoint's own trailing-30-day call count, as published by the upstream catalog and snapshotted daily. 13 snapshots so far.
$1.44
Verified settled volume
42 settlements proven x402 by their on-chain EIP-3009 marker.
$0.0051
Listed price
As published in the catalog. Always read the live 402 before paying.
8
Calls · 30d
Upstream's own call count for this endpoint, not ours.
5
Unique payers · 30d
Last called 2026-10-24 06:02Z
—
Upstream on-chain volume
Reported by the source catalog.
Paid to
0x9A4fb84633C690e422c33491D1FCC319849E6BB0The wallet the 402 directs payment to. Its whole payment record — every payer, every chain — is on the merchant page.
Asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913
Provider
The payTo wallet does not resolve to a registered ERC-8004 agent. That is not a verdict on the service — most of the catalog is unregistered.
Live 402 challenge
Captured by the enrichment pass, not read just now. Prices can change — always read the 402 the endpoint answers with.
{
"error": "Payment required",
"accepts": [
{
"asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
"extra": {
"name": "USD Coin",
"version": "2"
},
"payTo": "0x9A4fb84633C690e422c33491D1FCC319849E6BB0",
"amount": "5100",
"scheme": "exact",
"network": "eip155:8453",
"maxTimeoutSeconds": 300
}
],
"resource": {
"url": "https://api.powahub.ai/b06c5e0be3b344409b7829997f6e3be9-cd/coin-valuation/valuation",
"tags": [
"numismatics",
"market_value",
"valuation",
"coin_prices"
],
"iconUrl": "https://powahub.ai/brand/powahub-icon-512.png",
"mimeType": "application/json",
"description": "Provides market value prices for numismatic coins.",
"serviceName": "PowaHub"
},
"extensions": {
"bazaar": {
"info": {
"input": {
"type": "http",
"method": "GET",
"queryParams": {
"year": "string",
"grade": "string",
"metal": "string",
"issuer": "string",
"series": "string",
"slabbed": "string",
"variant": "string",
"fineness": "string",
"mint_mark": "string",
"weight_oz": "string",
"window_to": "string",
"strike_type": "string",
"window_from": "string",
"denomination": "string",
"window_sales": "string"
}
},
"output": {
"type": "json",
"example": {}
}
},
"schema": {
"type": "object",
"$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",
"HEAD",
"DELETE"
],
"type": "string"
},
"queryParams": {
"type": "object",
"required": [
"denomination"
],
"properties": {
"year": {
"type": "string",
"description": "Year as struck, e.g. 1906, 1821."
},
"grade": {
"type": "string",
"description": "Only sales of this grade count, e.g. very_fine or Very Fine."
},
"metal": {
"type": "string",
"description": "e.g. Silver, Gold"
},
"issuer": {
"type": "string",
"description": "Issuing authority as stored, e.g. United Kingdom of Great Britain and Ireland."
},
"series": {
"type": "string",
"description": "The series, e.g. Britannia."
},
"slabbed": {
"type": "string",
"description": "true: only coins sold in a grading slab; false: all others. Lower case."
},
"variant": {
"type": "string",
"description": "A variety or treatment, e.g. Piedfort."
},
"fineness": {
"type": "string",
"description": "Purity as a decimal, e.g. 0.925 (0.9250 matches too)."
},
"mint_mark": {
"type": "string",
"description": "The mint mark as struck, e.g. S, SA. Leave out if none or unknown."
},
"weight_oz": {
"type": "string",
"description": "Fine metal content in troy ounces, e.g. 1 for a 1 oz bullion coin. Bullion coins only."
},
"window_to": {
"type": "string",
"description": "Only sales up to this date, YYYY-MM-DD."
},
"strike_type": {
"type": "string",
"description": "How it was struck: business, proof, reverse_proof, matte_proof, specimen, brilliant_uncirculated or bullion (the label works too, e.g. Proof)."
},
"window_from": {
"type": "string",
"description": "Only sales from this date, YYYY-MM-DD. Not with window_sales."
},
"denomination": {
"type": "string",
"description": "The coin's denomination, e.g. Florin, Crown."
},
"window_sales": {
"type": "string",
"description": "Number of most recent sales to use, 1–500 (integer). Not with a date range."
}
}
}
},
"additionalProperties": false
},
"output": {
"type": "object",
"required": [
"type"
],
"properties": {
"type": {
"type": "string"
},
"example": {
"type": "object"
}
}
}
}
},
"routeTemplate": "/b06c5e0be3b344409b7829997f6e3be9-cd/coin-valuation/valuation"
}
},
"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.
0.0051USDC≈ $0.0051 USD
on Base · exact scheme
Pay 0.0051 USDC on Base to 0x9A4f…E6BB0. The signed payment is good for 5 minutes.
- Paid to
- 0x9A4f…E6BB0
- USD Coin contract
- 0x8335…02913
- Payment window
- 5 minutes
- As published
- 5100 smallest units
The catalog’s raw entry
[
{
"asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
"extra": {
"name": "USD Coin",
"version": "2"
},
"payTo": "0x9A4fb84633C690e422c33491D1FCC319849E6BB0",
"amount": "5100",
"scheme": "exact",
"network": "eip155:8453",
"maxTimeoutSeconds": 300
}
]Extensions
{
"bazaar": {
"info": {
"input": {
"type": "http",
"method": "GET",
"queryParams": {
"year": "string",
"grade": "string",
"metal": "string",
"issuer": "string",
"series": "string",
"slabbed": "string",
"variant": "string",
"fineness": "string",
"mint_mark": "string",
"weight_oz": "string",
"window_to": "string",
"strike_type": "string",
"window_from": "string",
"denomination": "string",
"window_sales": "string"
}
},
"output": {
"type": "json",
"example": {}
}
},
"schema": {
"type": "object",
"$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",
"HEAD",
"DELETE"
],
"type": "string"
},
"queryParams": {
"type": "object",
"required": [
"denomination"
],
"properties": {
"year": {
"type": "string",
"description": "Year as struck, e.g. 1906, 1821."
},
"grade": {
"type": "string",
"description": "Only sales of this grade count, e.g. very_fine or Very Fine."
},
"metal": {
"type": "string",
"description": "e.g. Silver, Gold"
},
"issuer": {
"type": "string",
"description": "Issuing authority as stored, e.g. United Kingdom of Great Britain and Ireland."
},
"series": {
"type": "string",
"description": "The series, e.g. Britannia."
},
"slabbed": {
"type": "string",
"description": "true: only coins sold in a grading slab; false: all others. Lower case."
},
"variant": {
"type": "string",
"description": "A variety or treatment, e.g. Piedfort."
},
"fineness": {
"type": "string",
"description": "Purity as a decimal, e.g. 0.925 (0.9250 matches too)."
},
"mint_mark": {
"type": "string",
"description": "The mint mark as struck, e.g. S, SA. Leave out if none or unknown."
},
"weight_oz": {
"type": "string",
"description": "Fine metal content in troy ounces, e.g. 1 for a 1 oz bullion coin. Bullion coins only."
},
"window_to": {
"type": "string",
"description": "Only sales up to this date, YYYY-MM-DD."
},
"strike_type": {
"type": "string",
"description": "How it was struck: business, proof, reverse_proof, matte_proof, specimen, brilliant_uncirculated or bullion (the label works too, e.g. Proof)."
},
"window_from": {
"type": "string",
"description": "Only sales from this date, YYYY-MM-DD. Not with window_sales."
},
"denomination": {
"type": "string",
"description": "The coin's denomination, e.g. Florin, Crown."
},
"window_sales": {
"type": "string",
"description": "Number of most recent sales to use, 1–500 (integer). Not with a date range."
}
}
}
},
"additionalProperties": false
},
"output": {
"type": "object",
"required": [
"type"
],
"properties": {
"type": {
"type": "string"
},
"example": {
"type": "object"
}
}
}
}
},
"routeTemplate": "/b06c5e0be3b344409b7829997f6e3be9-cd/coin-valuation/valuation"
}
}Provenance
- Seen in the source catalog
- 2026-10-24 06:02Z
- Last indexed by Roundhouse
- 2026-10-26 17:20Z
- Last enriched (probe, favicon, geo)
- 2026-10-20 10:45Z
- 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
This endpoint's own trailing-30-day call count, as published by the upstream catalog and snapshotted daily. 13 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 PowaHub 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=PowaHub' 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.powahub.ai/b06c5e0be3b344409b7829997f6e3be9-cd/coin-valuation/valuation, 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.