Roundhouse AI

x402toll.com

Trustless verified answers for AI agents: 56 financial, tax & legal calculators sold per call in USDC on Base via x402. Every answer ships its 2026 source, a formula trace, and a reproducible hash — re-derive it yourself for free at /v1/golden/:id. Don

OtherLiveeip155:8453Exactvia cdp
https://x402toll.com/v1/reports/tax-estimate
Settlements · 30d
4↓ 100%
No per-endpoint history for this service yet, so this is payments indexed to its PROVIDER's wallet over 30 days.
$8.58
Verified settled volume
73 settlements proven x402 by their on-chain EIP-3009 marker.
$1.00
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
0x1C9923489CD7D75Dd2f6735c48090b8bD4c7E5a9

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.

Accepts

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

1USDC≈ $1 USD
on Base · exact scheme

Pay 1 USDC on Base to 0x1C99…7E5a9. The signed payment is good for 2 minutes.

Paid to
0x1C99…7E5a9
USD Coin contract
0x8335…02913
Payment window
2 minutes
As published
1000000 smallest units
The catalog’s raw entry
[
  {
    "asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
    "extra": {
      "name": "USD Coin",
      "version": "2"
    },
    "payTo": "0x1C9923489CD7D75Dd2f6735c48090b8bD4c7E5a9",
    "amount": "1000000",
    "scheme": "exact",
    "network": "eip155:8453",
    "maxTimeoutSeconds": 120
  }
]

Extensions

{
  "bazaar": {
    "info": {
      "input": {
        "body": {
          "state": "TX",
          "wages": 100000,
          "filingStatus": "single"
        },
        "type": "http",
        "method": "POST",
        "bodyType": "json"
      },
      "output": {
        "type": "json",
        "example": {
          "note": "2026 full federal + SE + FICA + state estimate composed from verified engines. State tax applies the state schedule to gross ordinary income; excludes local tax, credits beyond the flat amount supplied, and AMT. Not tax advice.",
          "inputs": {
            "state": "TX",
            "wages": 100000,
            "credits": 0,
            "filingStatus": "single",
            "deductionType": "standard",
            "otherOrdinaryIncome": 0,
            "selfEmploymentIncome": 0
          },
          "totalTax": 20820,
          "breakdown": [
            {
              "amount": 13170,
              "component": "Federal income tax"
            },
            {
              "amount": 0,
              "component": "Self-employment tax"
            }
          ],
          "stateName": "Texas",
          "grossIncome": 100000,
          "employeeFICA": 7650,
          "stateTaxType": "No state income tax",
          "deductionUsed": 16100,
          "taxableIncome": 83900,
          "afterTaxIncome": 79180,
          "stateIncomeTax": 0,
          "effectiveRatePct": 20.82,
          "federalIncomeTax": 13170,
          "largestComponent": "Federal income tax",
          "selfEmploymentTax": 0,
          "adjustedGrossIncome": 100000,
          "federalMarginalRatePct": 22
        }
      }
    },
    "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",
              "properties": {
                "state": {
                  "type": "string",
                  "default": "TX"
                },
                "wages": {
                  "type": "number",
                  "default": 0
                },
                "credits": {
                  "type": "number",
                  "default": 0
                },
                "adjustments": {
                  "type": "number",
                  "default": 0
                },
                "filingStatus": {
                  "enum": [
                    "single",
                    "mfj"
                  ],
                  "type": "string",
                  "default": "single"
                },
                "deductionType": {
                  "enum": [
                    "standard",
                    "itemized"
                  ],
                  "type": "string",
                  "default": "standard"
                },
                "itemizedDeductions": {
                  "type": "number",
                  "default": 0
                },
                "otherOrdinaryIncome": {
                  "type": "number",
                  "default": 0
                },
                "selfEmploymentIncome": {
                  "type": "number",
                  "default": 0
                }
              }
            },
            "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",
              "properties": {
                "note": {
                  "type": "string"
                },
                "inputs": {
                  "type": "object"
                },
                "totalTax": {
                  "type": "number"
                },
                "breakdown": {
                  "type": "array"
                },
                "stateName": {
                  "type": "string"
                },
                "grossIncome": {
                  "type": "number"
                },
                "employeeFICA": {
                  "type": "number"
                },
                "stateTaxType": {
                  "type": "string"
                },
                "deductionUsed": {
                  "type": "number"
                },
                "taxableIncome": {
                  "type": "number"
                },
                "afterTaxIncome": {
                  "type": "number"
                },
                "stateIncomeTax": {
                  "type": "number"
                },
                "effectiveRatePct": {
                  "type": "number"
                },
                "federalIncomeTax": {
                  "type": "number"
                },
                "largestComponent": {
                  "type": "string"
                },
                "selfEmploymentTax": {
                  "type": "number"
                },
                "adjustedGrossIncome": {
                  "type": "number"
                },
                "federalMarginalRatePct": {
                  "type": "number"
                }
              },
              "additionalProperties": true
            }
          }
        }
      }
    }
  }
}

Provenance

Seen in the source catalog
2026-07-19 19:26Z
Last indexed by Roundhouse
2026-07-20 00:20Z
Last enriched (probe, favicon, geo)
2026-09-23 10:15Z
x402 version
2
Max timeout
120s
Liveness probe
HTTP 404
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

No per-endpoint history for this service yet, so this is payments indexed to its PROVIDER's wallet over 30 days. 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 x402toll.com 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=x402toll.com'
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://x402toll.com/v1/reports/tax-estimate, 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.