ChainState
One-call Base address profile for agents: code, proxy, interfaces, token, balances, denylist.
DataLiveeip155:8453Exactvia cdp
BaseAddressProxyerc20erc165
Calls · 30d
9
This endpoint's own trailing-30-day call count, as published by the upstream catalog and snapshotted daily. 6 snapshots so far.
$7.10
Verified settled volume
514 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.
9
Calls · 30d
Upstream's own call count for this endpoint, not ours.
1
Unique payers · 30d
Last called 2026-09-24 07:39Z
—
Upstream on-chain volume
Reported by the source catalog.
Paid to
0x9876af0F6D8Ed5155Cd02d1ca56D128601612690The 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 0x9876…12690. The signed payment is good for 1 minute.
- Paid to
- 0x9876…12690
- USD Coin contract
- 0x8335…02913
- Payment window
- 1 minute
- As published
- 10000 smallest units
The catalog’s raw entry
[
{
"asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
"extra": {
"name": "USD Coin",
"version": "2"
},
"payTo": "0x9876af0F6D8Ed5155Cd02d1ca56D128601612690",
"amount": "10000",
"scheme": "exact",
"network": "eip155:8453",
"maxTimeoutSeconds": 60
}
]Extensions
{
"bazaar": {
"info": {
"input": {
"body": {
"address": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913"
},
"type": "http",
"method": "POST",
"bodyType": "json"
},
"output": {
"type": "json",
"example": {
"ok": true,
"result": {
"rpc": {
"endpoints": [],
"reachable": true,
"configured": true
},
"chain": "eip155:8453",
"proxy": {
"kind": "zeppelinos",
"admin": "0x4fc7850364958d97B4d3f5A08f79db2493f8cA44",
"beacon": null,
"detail": "resolved through the legacy zeppelinos slot; the EIP-1967 slot is empty on this contract, which is the case for Base USDC",
"address": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
"upgradeable": true,
"slots_probed": [
{
"slot": "0x7050c9e0f4ca769c69bd3a8ef740bc37934f8e2c036e5a723fd8ee048ed3f8c3",
"label": "zeppelinos.implementation",
"value": "0x0000000000000000000000002ce6311ddae708829bc0784c967b7d77d19fd779",
"address": "0x2Ce6311ddAE708829bc0784C967b7d77D19FD779"
},
{
"slot": "0x10d6a54a4754c8869d6886b5f5d7fbfa5b4522237ea5c60d11bc4e7a1ff9390b",
"label": "zeppelinos.admin",
"value": "0x0000000000000000000000004fc7850364958d97b4d3f5a08f79db2493f8ca44",
"address": "0x4fc7850364958d97B4d3f5A08f79db2493f8cA44"
}
],
"implementation": "0x2Ce6311ddAE708829bc0784C967b7d77D19FD779"
},
"token": {
"detail": "symbol, decimals, and totalSupply read from the token",
"symbol": "USDC",
"decimals": 6,
"total_supply": "4305008625389354"
},
"account": {
"detail": "1852 bytes of runtime code",
"code_size": 1852,
"is_contract": true
},
"address": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
"balances": [],
"interfaces": {
"erc20": true,
"detail": "supportsInterface did not answer, so ERC-721 and ERC-1155 are reported as unknown rather than absent; ERC-20 is confirmed behaviourally from totalSupply, decimals, and balanceOf",
"erc165": null,
"erc721": null,
"erc1155": null
},
"unresolved": [
"ERC-165 interface support: supportsInterface did not answer"
],
"denylist_hits": []
},
"verdict": "warn",
"evidence": [
{
"code": "INTERFACE_PROBE_UNANSWERED",
"detail": "This contract did not answer supportsInterface, so ERC-721 and ERC-1155 support is reported as null. That is not evidence against them: plenty of live contracts predate ERC-165 entirely.",
"source": "erc165",
"severity": "info"
},
{
"code": "PROXY_UPGRADEABLE",
"data": {
"kind": "zeppelinos",
"admin": "0x4fc7850364958d97B4d3f5A08f79db2493f8cA44",
"implementation": "0x2Ce6311ddAE708829bc0784C967b7d77D19FD779"
},
"detail": "This is an upgradeable zeppelinos proxy. Everything reported here describes the implementation deployed right now; the admin can point it elsewhere before your next call lands, so this is a risk signal rather than metadata.",
"source": "proxy-slots",
"severity": "medium"
}
],
"warnings": [],
"confidence": 1,
"risk_codes": [
"PROXY_UPGRADEABLE"
],
"request_hash": "sha256:96b41fa639c553a6dc6bfaa1d8ccc056912abc36e8bbde3d65f3e1edc2bd147f",
"data_versions": {
"chain": "eip155:8453",
"policy": "2026-09-19",
"denylist": "2026-08-03.1",
"abi_packs": "2026-08-03.1",
"proxy_slots": "7"
},
"policy_version": "2026-09-19"
}
}
},
"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": "ChainStateRequest",
"$schema": "https://json-schema.org/draft/2020-12/schema",
"required": [
"address"
],
"properties": {
"tokens": {
"type": "array",
"items": {
"type": "string",
"pattern": "^0x[0-9a-fA-F]{40}$"
},
"maxItems": 10,
"description": "ERC-20 contracts to read balanceOf(address) on for the subject. Amounts come back in base units with the token's decimals, or null with a reason."
},
"address": {
"type": "string",
"pattern": "^0x[0-9a-fA-F]{40}$",
"description": "The Base address to profile. Case-insensitive; normalised to EIP-55."
},
"selector": {
"type": "string",
"pattern": "^0x[0-9a-fA-F]{8}$",
"description": "Only used for EIP-2535 diamonds, which have no single implementation and resolve their executing code per selector. Ignored for every other proxy kind."
}
},
"additionalProperties": false
},
"type": {
"type": "string",
"const": "http"
},
"method": {
"enum": [
"POST"
],
"type": "string"
},
"bodyType": {
"enum": [
"json",
"form-data",
"text"
],
"type": "string"
}
},
"additionalProperties": false
},
"output": {
"type": "object",
"required": [
"type"
],
"properties": {
"type": {
"type": "string"
},
"example": {
"type": "object",
"required": [
"ok",
"verdict",
"risk_codes",
"evidence",
"result",
"request_hash"
],
"properties": {
"result": {
"type": "object",
"required": [
"address",
"account",
"proxy",
"interfaces",
"token",
"balances",
"unresolved"
]
},
"verdict": {
"enum": [
"allow",
"warn",
"block",
"unknown"
],
"type": "string",
"description": "Precedence: block, then unknown, then warn, then allow."
}
}
}
}
}
}
}
}
}Provenance
- Seen in the source catalog
- 2026-09-25 07:38Z
- Last indexed by Roundhouse
- 2026-09-25 08:10Z
- Last enriched (probe, favicon, geo)
- 2026-09-19 20:45Z
- x402 version
- 2
- Max timeout
- 60s
- Liveness probe
- HTTP 404
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 ChainState 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=ChainState' 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://chainstate.schemasure.com/v1/chain/state, 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.