zc-utils open-data toolkit

Validate an email address without sending mail: syntax, live MX lookup, disposable-domain check (open blocklist), role-account flag, deliverability verdict. Price: $0.002 USDC per call.

Tradingoffline · HTTP 503eip155:8453Exactvia facilitator:payAI
EmailValidationMxDeliverability
Activity
—
Nothing indexed for this service or its provider yet. Not a claim that it is unused — only that we hold no record.
–
Verified settled volume
40 settlements proven x402 by their on-chain EIP-3009 marker.
$0.00
Listed price
As published in the catalog. Always read the live 402 before paying.
–
Calls · 30d
Upstream's own call count for this endpoint, not ours.
–
Unique payers · 30d
Never called
–
Upstream on-chain volume
Reported by the source catalog.
Paid to
0xb2019Ab7Abd1bD6d190E1dBA084DcBa0C0180071

The wallet the 402 directs payment to. Its full payment record 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.

Recent payments · which agents last used it

Every indexed settlement paid to this service’s wallet, newest first. The index does not record which endpoint a payment was for, so if this wallet serves more than one endpoint, the rows include payments for the others. Paged up to the newest 5,000; the full history is on the merchant page.

Payer PayeeChainAmountx402RouteAgeTxn hash
0x93f4…982c0xb201…0071BaseBase$0.00100%payAI54d ago0x719b50…802163
0x93f4…982c0xb201…0071BaseBase$0.00100%payAI54d ago0x16d571…3c5eca
0x93f4…982c0xb201…0071BaseBase$0.00100%payAI54d ago0x94c7b7…03e0d8
0x93f4…982c0xb201…0071BaseBase$0.00100%payAI54d ago0x72bf0f…dd629e
0x93f4…982c0xb201…0071BaseBase$0.00100%payAI54d ago0xe5ff45…e0f520
0x93f4…982c0xb201…0071BaseBase$0.00100%payAI54d ago0xc3543c…3265b9
0x93f4…982c0xb201…0071BaseBase$0.00100%payAI54d ago0xcc1ec0…b8a8e6
0x93f4…982c0xb201…0071BaseBase$0.00100%payAI54d ago0xbaf583…41d9e5
0x93f4…982c0xb201…0071BaseBase$0.00100%payAI54d ago0x6cfefb…24a1c0
0x93f4…982c0xb201…0071BaseBase$0.00100%payAI54d ago0x7e0ecc…bf3e07
0x93f4…982c0xb201…0071BaseBase$0.00100%payAI54d ago0x4f00a6…496c21
0x93f4…982c0xb201…0071BaseBase$0.00100%payAI54d ago0xe9623f…e04387
0x93f4…982c0xb201…0071BaseBase$0.00100%payAI54d ago0x02a6ff…0038c8
0x93f4…982c0xb201…0071BaseBase$0.00100%payAI54d ago0x937187…5542aa
0x93f4…982c0xb201…0071BaseBase$0.00100%payAI54d ago0x4c4c2d…806b0c
0x93f4…982c0xb201…0071BaseBase$0.00100%payAI54d ago0xaf2dc9…e72183
0x93f4…982c0xb201…0071BaseBase$0.00100%payAI54d ago0x16af20…1c2050
0x93f4…982c0xb201…0071BaseBase$0.00100%payAI54d ago0x9305db…3fefb8
0x93f4…982c0xb201…0071BaseBase$0.00100%openfacilitator54d ago0x69fddd…1f1982
0x93f4…982c0xb201…0071BaseBase$0.00100%ultravioletadao54d ago0xc70432…1b121a
0x93f4…982c0xb201…0071BaseBase$0.00100%payAI54d ago0x4fdeb1…0c284a
0x93f4…982c0xb201…0071BaseBase$0.00100%payAI54d ago0xf10859…9d93f9
0x93f4…982c0xb201…0071BaseBase$0.00100%payAI54d ago0x86359b…84472c
0x93f4…982c0xb201…0071BaseBase$0.00100%payAI54d ago0x05ee39…72ab93
0x93f4…982c0xb201…0071BaseBase$0.00100%payAI54d ago0x5eb65e…dfc96c

Accepts

The payment requirements as published to the catalog. Read the live 402 before paying: a price here is a claim, not a quote.

0USDC≈ $0 USD
on Base · exact scheme

Pay 0 USDC on Base to 0xb201…80071. The signed payment is good for 5 minutes.

USD Coin contract
0x8335…02913
Payment window
5 minutes
As published
0 smallest units
The catalog’s raw entry
[
  {
    "asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
    "extra": {
      "name": "USD Coin",
      "version": "2"
    },
    "payTo": "0xb2019Ab7Abd1bD6d190E1dBA084DcBa0C0180071",
    "amount": "0",
    "scheme": "exact",
    "network": "eip155:8453",
    "maxTimeoutSeconds": 300
  }
]

Extensions

{
  "bazaar": {
    "info": {
      "input": {
        "type": "http",
        "method": "GET",
        "queryParams": {
          "email": "jane@example.com"
        }
      },
      "output": {
        "type": "json",
        "example": {
          "email": "jane@example.com",
          "verdict": "deliverable",
          "mx_found": true,
          "disposable": false,
          "role_account": false,
          "syntax_valid": true
        }
      }
    },
    "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": [
                "email"
              ],
              "properties": {
                "email": {
                  "type": "string",
                  "description": "Email address to check"
                }
              }
            }
          },
          "additionalProperties": false
        },
        "output": {
          "type": "object",
          "required": [
            "type"
          ],
          "properties": {
            "type": {
              "type": "string"
            },
            "example": {
              "type": "object"
            }
          }
        }
      }
    }
  }
}

Provenance

Seen in the source catalog
2026-09-18 18:00Z
Last indexed by Roundhouse
2026-09-21 17:15Z
Last enriched (probe, favicon, geo)
2026-09-18 21:15Z
x402 version
2
Max timeout
300s
Liveness probe
HTTP 503
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

Nothing indexed for this service or its provider yet. Not a claim that it is unused — only that we hold no record. 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 zc-utils open-data toolkit 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=zc-utils%20open-data%20toolkit'
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://pl345ggl4zodwapsakrhzck2ra.srv.us/v1/email/validate, 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.