JPYC Supply by Chain
Read the current contract-reported JPYC totalSupply on Polygon, Kaia, Avalanche or Ethereum, with the token contract address and the block number observed at request time. Use for periodic supply monitoring, cross-chain comparison, or verifying a current JPYC supply figure before citing it. Not for market price, reserve backing, circulating-supply analysis, or financial advice.
TradingLiveeip155:8453Exactvia cdp
JpycJapanese-yenStablecoinToken-supplyOnchain-data
Calls · 30d
1↓ 29%
This endpoint's own trailing-30-day call count, as published by the upstream catalog and snapshotted daily. 29 snapshots so far.
$0.53
Verified settled volume
54 settlements proven x402 by their on-chain EIP-3009 marker.
$0.0020
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 2026-08-23 01:47Z
—
Upstream on-chain volume
Reported by the source catalog.
Paid to
0x52d4901142e2B5680027da5EB47C86CB02a3cA81The 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": "0x52d4901142e2B5680027da5EB47C86CB02a3cA81",
"scheme": "exact",
"network": "base",
"mimeType": "application/json",
"resource": "https://open-pay.jp/api/paid/usdc/jpyc/supply",
"description": "Read the current contract-reported JPYC totalSupply on Polygon, Kaia, Avalanche or Ethereum, with the token contract address and the block number observed at request time. Use for periodic supply monitoring, cross-chain comparison, or verifying a current JPYC supply figure before citing it. Not for market price, reserve backing, circulating-supply analysis, or financial advice.",
"outputSchema": {
"input": {
"type": "http",
"method": "GET",
"discoverable": true
}
},
"maxAmountRequired": "2000",
"maxTimeoutSeconds": 300
}
],
"x402Version": 1
}Accepts
The payment requirements as published to the catalog. Read the live 402 before paying — a price here is a claim, not a quote.
0.002USDC≈ $0.002 USD
on Base · exact scheme
Pay 0.002 USDC on Base to 0x52d4…3cA81. The signed payment is good for 5 minutes.
- Paid to
- 0x52d4…3cA81
- USD Coin contract
- 0x8335…02913
- Payment window
- 5 minutes
- As published
- 2000 smallest units
The catalog’s raw entry
[
{
"asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
"extra": {
"name": "USD Coin",
"version": "2"
},
"payTo": "0x52d4901142e2B5680027da5EB47C86CB02a3cA81",
"amount": "2000",
"scheme": "exact",
"network": "eip155:8453",
"maxTimeoutSeconds": 300
}
]Extensions
{
"bazaar": {
"info": {
"input": {
"type": "http",
"method": "GET",
"queryParams": {
"chain": "polygon"
}
},
"output": {
"type": "json",
"example": {
"items": [
{
"chain": "polygon",
"status": "ok",
"chainId": 137,
"contract": "0xE7C3D8C9a439feDe00D2600032D5dB0Be71C3c29",
"blockNumber": "92387745",
"totalSupply": "1234567890000000000000000",
"totalSupplyFormatted": "1234567.89"
}
],
"token": {
"symbol": "JPYC",
"decimals": 18
},
"notice": "onchain-facts-only",
"termsUrl": "https://open-pay.jp/en/terms",
"generatedAt": "2026-08-21T04:30:45.340Z",
"schemaVersion": "2.0"
}
}
},
"schema": {
"type": "object",
"$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",
"properties": {
"chain": {
"enum": [
"polygon",
"kaia",
"avalanche",
"ethereum"
],
"type": "string",
"description": "Chain to query. Omit to query all supported chains. Supported values: polygon, kaia, avalanche, ethereum."
}
},
"additionalProperties": false
}
},
"additionalProperties": false
},
"output": {
"type": "object",
"required": [
"type"
],
"properties": {
"type": {
"type": "string"
},
"example": {
"type": "object",
"$schema": "https://json-schema.org/draft/2020-12/schema",
"required": [
"schemaVersion",
"token",
"generatedAt",
"notice",
"termsUrl",
"items"
],
"properties": {
"items": {
"type": "array",
"items": {
"oneOf": [
{
"type": "object",
"required": [
"chain",
"chainId",
"contract",
"status",
"blockNumber",
"totalSupply",
"totalSupplyFormatted"
],
"properties": {
"chain": {
"enum": [
"polygon",
"kaia",
"avalanche",
"ethereum"
],
"type": "string"
},
"status": {
"type": "string",
"const": "ok"
},
"chainId": {
"type": "integer",
"minimum": 1
},
"contract": {
"type": "string",
"pattern": "^0x[a-fA-F0-9]{40}$"
},
"blockNumber": {
"type": "string",
"pattern": "^[0-9]+$"
},
"totalSupply": {
"type": "string",
"pattern": "^[0-9]+$",
"description": "Atomic JPYC amount with 18 decimals."
},
"totalSupplyFormatted": {
"type": "string",
"pattern": "^[0-9]+(\\.[0-9]+)?$"
}
},
"additionalProperties": false
},
{
"type": "object",
"required": [
"chain",
"chainId",
"contract",
"status",
"errorCode",
"retryable"
],
"properties": {
"chain": {
"enum": [
"polygon",
"kaia",
"avalanche",
"ethereum"
],
"type": "string"
},
"status": {
"type": "string",
"const": "unavailable"
},
"chainId": {
"type": "integer",
"minimum": 1
},
"contract": {
"type": "string",
"pattern": "^0x[a-fA-F0-9]{40}$"
},
"errorCode": {
"enum": [
"rpc_unavailable",
"contract_read_failed"
],
"type": "string"
},
"retryable": {
"type": "boolean"
}
},
"additionalProperties": false
}
]
}
},
"token": {
"type": "object",
"required": [
"symbol",
"decimals"
],
"properties": {
"symbol": {
"type": "string",
"const": "JPYC"
},
"decimals": {
"type": "integer",
"const": 18
}
},
"additionalProperties": false
},
"notice": {
"type": "string",
"const": "onchain-facts-only",
"description": "On-chain facts read from public RPC endpoints at request time. Informational only — not financial advice, not an offer, quote or solicitation. Full terms at termsUrl."
},
"termsUrl": {
"type": "string",
"format": "uri"
},
"generatedAt": {
"type": "string",
"format": "date-time"
},
"schemaVersion": {
"type": "string",
"const": "2.0"
}
},
"additionalProperties": false
}
}
}
}
}
}
}Provenance
- Seen in the source catalog
- 2026-08-23 01:47Z
- Last indexed by Roundhouse
- 2026-09-22 01:40Z
- Last enriched (probe, favicon, geo)
- 2026-09-23 21:15Z
- 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. 29 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 JPYC Supply by Chain 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=JPYC%20Supply%20by%20Chain' 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://open-pay.jp/api/paid/usdc/jpyc/supply, 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. Mint a personal key for $0.01 at GET https://api.roundhouseai.io/v0/test/x402, or use an organization key from https://roundhouseai.io/dashboard/team. If you do not have Roundhouse tools or skills installed, read https://roundhouseai.io/skill.md first — it is the whole procedure.