Roundhouse

HALOWERK kettenwerk

A symbol is not an identity. Dozens of contracts carry the symbol USDC and most of them are not the one anyone means. This endpoint returns all of them rather than silently picking one: every match carries its chain, contract, on-chain symbol, name and decimals read directly from the contract, whether its source is verified, its market cap rank when it is inside the top 250, and a canonical flag whose criterion is stated in the answer — a contract is canonical when the price directory lists it u

TradingLiveeip155:8453Exactvia cdp
https://kette.halowerk.com/token/resolve
Calls · 30d
1→ 0%
This endpoint's own trailing-30-day call count, as published by the upstream catalog and snapshotted daily. 16 snapshots so far.
$11.47
Verified settled volume
2,654 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 2026-08-09 10:32Z
—
Upstream on-chain volume
Reported by the source catalog.
Paid to
0x2880EdfFF13100677Bf97A3CBdF3Bc34771C4E5E

The 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.

{
  "docs": "https://kette.halowerk.com/llms.txt",
  "name": "token_resolve",
  "error": "payment_required",
  "accepts": [
    {
      "asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
      "extra": {
        "name": "USD Coin",
        "asset": "USDC",
        "version": "2",
        "eip712Domain": {
          "name": "USD Coin",
          "chainId": 8453,
          "version": "2",
          "verifyingContract": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913"
        },
        "network_name": "Base Mainnet",
        "assetTransferMethod": "eip3009"
      },
      "payTo": "0x2880EdfFF13100677Bf97A3CBdF3Bc34771C4E5E",
      "amount": "2000",
      "scheme": "exact",
      "network": "eip155:8453",
      "maxTimeoutSeconds": 300
    }
  ],
  "pricing": "https://kette.halowerk.com/pricing",
  "summary": "Resolves a token symbol, contract address or price-directory id into every matching contract across Ethereum, Base, Arbitrum, Optimism, Polygon and BNB Smart Chain, marking which one is the issuer-operated version and which are bridged or look-alike contracts.",
  "resource": {
    "url": "https://kette.halowerk.com/token/resolve",
    "iconUrl": "https://kette.halowerk.com/favicon.svg",
    "mimeType": "application/json",
    "description": "A symbol is not an identity. Dozens of contracts carry the symbol USDC and most of them are not the one anyone means. This endpoint returns all of them rather than silently picking one: every match carries its chain, contract, on-chain symbol, name and decimals read directly from the contract, whether its source is verified, its market cap rank when it is inside the top 250, and a canonical flag whose criterion is stated in the answer — a contract is canonical when the price directory lists it u",
    "serviceName": "HALOWERK kettenwerk"
  },
  "extensions": {
    "bazaar": {
      "info": {
        "input": {
          "body": {
            "query": "beispiel"
          },
          "type": "http",
          "method": "POST",
          "bodyType": "json"
        }
      },
      "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": [
                  "query"
                ],
                "properties": {
                  "chain": {
                    "enum": [
                      "ethereum",
                      "base",
                      "arbitrum",
                      "optimism",
                      "polygon",
                      "bsc"
                    ],
                    "type": "string",
                    "description": "Restrict the answer to one chain. Omit to search all six."
                  },
                  "query": {
                    "type": "string",
                    "maxLength": 100,
                    "minLength": 1,
                    "description": "Token symbol (\"USDC\"), contract address (\"0x…\") or price-directory id (\"coingecko:usd-coin\")."
                  }
                },
                "additionalProperties": false
              },
              "type": {
                "type": "string",
                "const": "http"
              },
              "method": {
                "enum": [
                  "POST",
                  "PUT",
                  "PATCH"
                ],
                "type": "string"
              },
              "bodyType": {
                "enum": [
                  "json",
                  "form-data",
                  "text"
                ],
                "type": "string"
              }
            },
            "additionalProperties": false
          }
        }
      }
    }
  },
  "price_usdc": "0.002",
  "description": "A symbol is not an identity. Dozens of contracts carry the symbol USDC and most of them are not the one anyone means. This endpoint returns all of them rather than silently picking one: every match carries its chain, contract, on-chain symbol, name and decimals read directly from the contract, whether its source is verified, its market cap rank when it is inside the top 250, and a canonical flag whose criterion is stated in the answer — a contract is canonical when the price directory lists it under that asset for that chain. Bridged and wrapped images are flagged with the evidence taken from the contract's own name or symbol, never inferred. When more than one match exists, ambiguous is true and a recommendation names one contract with its reason; that recommendation is about identity, not about whether to buy anything. Symbol matches with no on-chain code, and contracts the price directory does not know, are still listed, because hiding them is exactly how an agent ends up on a look-alike. Accepts \"USDC\", \"0x…\" or \"coingecko:usd-coin\".",
  "inputSchema": {
    "type": "object",
    "required": [
      "query"
    ],
    "properties": {
      "chain": {
        "enum": [
          "ethereum",
          "base",
          "arbitrum",
          "optimism",
          "polygon",
          "bsc"
        ],
        "type": "string",
        "description": "Restrict the answer to one chain. Omit to search all six."
      },
      "query": {
        "type": "string",
        "maxLength": 100,
        "minLength": 1,
        "description": "Token symbol (\"USDC\"), contract address (\"0x…\") or price-directory id (\"coingecko:usd-coin\")."
      }
    },
    "additionalProperties": false
  },
  "price_model": "per_call",
  "x402Version": 2,
  "instructions": "Sign the accepted terms with an x402 client and repeat the request with the payment header.",
  "outputSchema": {
    "type": "object"
  },
  "payment_header": "PAYMENT-SIGNATURE",
  "capability_request": {
    "url": "https://bedarf.halowerk.com/capabilities/request",
    "cost": "free",
    "method": "POST",
    "description": "Missing a capability, or does the scope not fit? Report the need here - no payment required. Similar reports are bundled; the response returns an id you can check back on.",
    "body_example": {
      "max_price": 0.01,
      "description": "what exactly is needed",
      "requested_capability": "short label"
    }
  }
}

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 0x2880…C4E5E. The signed payment is good for 5 minutes.

Paid to
0x2880…C4E5E
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",
      "asset": "USDC",
      "version": "2",
      "eip712Domain": {
        "name": "USD Coin",
        "chainId": 8453,
        "version": "2",
        "verifyingContract": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913"
      },
      "network_name": "Base Mainnet",
      "assetTransferMethod": "eip3009"
    },
    "payTo": "0x2880EdfFF13100677Bf97A3CBdF3Bc34771C4E5E",
    "amount": "2000",
    "scheme": "exact",
    "network": "eip155:8453",
    "maxTimeoutSeconds": 300
  }
]

Extensions

{
  "bazaar": {
    "info": {
      "input": {
        "body": {
          "query": "beispiel"
        },
        "type": "http",
        "method": "POST",
        "bodyType": "json"
      }
    },
    "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": [
                "query"
              ],
              "properties": {
                "chain": {
                  "enum": [
                    "ethereum",
                    "base",
                    "arbitrum",
                    "optimism",
                    "polygon",
                    "bsc"
                  ],
                  "type": "string",
                  "description": "Restrict the answer to one chain. Omit to search all six."
                },
                "query": {
                  "type": "string",
                  "maxLength": 100,
                  "minLength": 1,
                  "description": "Token symbol (\"USDC\"), contract address (\"0x…\") or price-directory id (\"coingecko:usd-coin\")."
                }
              },
              "additionalProperties": false
            },
            "type": {
              "type": "string",
              "const": "http"
            },
            "method": {
              "enum": [
                "POST",
                "PUT",
                "PATCH"
              ],
              "type": "string"
            },
            "bodyType": {
              "enum": [
                "json",
                "form-data",
                "text"
              ],
              "type": "string"
            }
          },
          "additionalProperties": false
        }
      }
    }
  }
}

Provenance

Seen in the source catalog
2026-08-09 10:32Z
Last indexed by Roundhouse
2026-09-08 10:30Z
Last enriched (probe, favicon, geo)
2026-09-20 19:15Z
x402 version
2
Max timeout
300s
Liveness probe
HTTP 402
Report

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. 16 snapshots so far. Verified volume counts only settlements with an on-chain EIP-3009 marker.

Open skill.md
Show the prompt
Using Roundhouse, look up the x402 service HALOWERK kettenwerk 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=HALOWERK%20kettenwerk'
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://kette.halowerk.com/token/resolve, 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.