Roundhouse AI

TxSim Decoder

14 live x402 APIs for AI agents: web access, token safety, speech-to-text, chain data, SEO, search, email, video. Pay per call in USDC on Base, no API key.

OtherLiveeip155:8453Exactvia cdp
https://simulate.cyberwarex.com/safe-to-sign
Pre-signSafetyFirewallWallet-securityTransaction-risk
Calls · 30d
14↑ 110%
This endpoint's own trailing-30-day call count, as published by the upstream catalog and snapshotted daily. 13 snapshots so far.
$10.71
Verified settled volume
1,468 settlements proven x402 by their on-chain EIP-3009 marker.
$0.020
Listed price
As published in the catalog. Always read the live 402 before paying.
15
Calls · 30d
Upstream's own call count for this endpoint, not ours.
1
Unique payers · 30d
Last called 2026-09-24 07:35Z
—
Upstream on-chain volume
Reported by the source catalog.
Paid to
0x058D0Cc5CC97e61e8A9f38D6d6365bce525921B2

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.

{
  "accepts": [
    {
      "asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
      "extra": {
        "name": "USD Coin",
        "version": "2"
      },
      "payTo": "0x058D0Cc5CC97e61e8A9f38D6d6365bce525921B2",
      "amount": "20000",
      "scheme": "exact",
      "network": "eip155:8453",
      "maxTimeoutSeconds": 300
    }
  ],
  "catalog": {
    "docs": "https://cyberwarex.com/llms.txt",
    "services": "https://cyberwarex.com/.well-known/x402"
  },
  "resource": {
    "url": "https://simulate.cyberwarex.com/safe-to-sign",
    "tags": [
      "pre-sign",
      "safety",
      "firewall",
      "wallet-security",
      "transaction-risk"
    ],
    "iconUrl": "https://cyberwarex.com/assets/icon.png",
    "mimeType": "application/json",
    "description": "One pre-sign safety verdict (GREEN, REVIEW or BLOCK) fusing transaction, signature, address, URL and token checks for AI wallet agents.",
    "serviceName": "TxSim Decoder"
  },
  "extensions": {
    "bazaar": {
      "info": {
        "input": {
          "type": "http",
          "method": "GET",
          "queryParams": {
            "to": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
            "data": "0x095ea7b3000000000000000000000000111122223333444455556666777788889999aaaaffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff",
            "chain": "base"
          }
        }
      },
      "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",
                  "HEAD",
                  "DELETE"
                ],
                "type": "string"
              },
              "queryParams": {
                "type": "object",
                "properties": {
                  "to": {
                    "type": "string",
                    "description": "Transaction target address (0x...)."
                  },
                  "url": {
                    "type": "string",
                    "description": "A URL to phishing-check (optional)."
                  },
                  "data": {
                    "type": "string",
                    "description": "Transaction calldata hex (0x...)."
                  },
                  "from": {
                    "type": "string",
                    "description": "Sender address for the eth_call preview (optional)."
                  },
                  "chain": {
                    "type": "string",
                    "description": "EVM chain for tx/token checks (base, bsc, ethereum, polygon, arbitrum, optimism). Default base."
                  },
                  "token": {
                    "type": "string",
                    "description": "A token address to safety-check (optional; inferred from 'to' when it is a token)."
                  },
                  "value": {
                    "type": "string",
                    "description": "Native value (wei, decimal or hex). Default 0."
                  },
                  "address": {
                    "type": "string",
                    "description": "A counterparty address to risk-screen (optional; 'to' is screened automatically)."
                  },
                  "message": {
                    "type": "string",
                    "description": "personal_sign message to check (instead of typed_data)."
                  },
                  "typed_data": {
                    "type": "string",
                    "description": "EIP-712 typed data JSON string to check as a signature request."
                  }
                },
                "additionalProperties": false
              }
            },
            "additionalProperties": false
          }
        }
      }
    }
  },
  "x402Version": 2
}

Accepts

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

0.02USDC≈ $0.02 USD
on Base · exact scheme

Pay 0.02 USDC on Base to 0x058D…921B2. The signed payment is good for 5 minutes.

Paid to
0x058D…921B2
USD Coin contract
0x8335…02913
Payment window
5 minutes
As published
20000 smallest units
The catalog’s raw entry
[
  {
    "asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
    "extra": {
      "name": "USD Coin",
      "version": "2"
    },
    "payTo": "0x058D0Cc5CC97e61e8A9f38D6d6365bce525921B2",
    "amount": "20000",
    "scheme": "exact",
    "network": "eip155:8453",
    "maxTimeoutSeconds": 300
  }
]

Extensions

{
  "bazaar": {
    "info": {
      "input": {
        "type": "http",
        "method": "GET",
        "queryParams": {
          "to": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
          "data": "0x095ea7b3000000000000000000000000111122223333444455556666777788889999aaaaffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff",
          "chain": "base"
        }
      }
    },
    "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",
                "HEAD",
                "DELETE"
              ],
              "type": "string"
            },
            "queryParams": {
              "type": "object",
              "properties": {
                "to": {
                  "type": "string",
                  "description": "Transaction target address (0x...)."
                },
                "url": {
                  "type": "string",
                  "description": "A URL to phishing-check (optional)."
                },
                "data": {
                  "type": "string",
                  "description": "Transaction calldata hex (0x...)."
                },
                "from": {
                  "type": "string",
                  "description": "Sender address for the eth_call preview (optional)."
                },
                "chain": {
                  "type": "string",
                  "description": "EVM chain for tx/token checks (base, bsc, ethereum, polygon, arbitrum, optimism). Default base."
                },
                "token": {
                  "type": "string",
                  "description": "A token address to safety-check (optional; inferred from 'to' when it is a token)."
                },
                "value": {
                  "type": "string",
                  "description": "Native value (wei, decimal or hex). Default 0."
                },
                "address": {
                  "type": "string",
                  "description": "A counterparty address to risk-screen (optional; 'to' is screened automatically)."
                },
                "message": {
                  "type": "string",
                  "description": "personal_sign message to check (instead of typed_data)."
                },
                "typed_data": {
                  "type": "string",
                  "description": "EIP-712 typed data JSON string to check as a signature request."
                }
              },
              "additionalProperties": false
            }
          },
          "additionalProperties": false
        }
      }
    }
  }
}

Provenance

Seen in the source catalog
2026-09-24 07:35Z
Last indexed by Roundhouse
2026-09-25 03:10Z
Last enriched (probe, favicon, geo)
2026-09-11 14:45Z
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. 13 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 TxSim Decoder 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=TxSim%20Decoder'
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://simulate.cyberwarex.com/safe-to-sign, 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.