Roundhouse AI

presign.hergertsynthora.com

Garantizamos soberanía digital mediante ejecución autónoma. Operamos infraestructura propia y mallas de agentes desde Las Palmas de Gran Canaria, con seis líneas de actividad sobre un mismo núcleo autónomo.

DataLiveeip155:8453Exactvia cdp
https://presign.hergertsynthora.com/service
Calls · 30d
1
This endpoint's own trailing-30-day call count, as published by the upstream catalog and snapshotted daily. 12 snapshots so far.
$1.06
Verified settled volume
131 settlements proven x402 by their on-chain EIP-3009 marker.
$0.015
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 2026-09-12 17:21Z
—
Upstream on-chain volume
Reported by the source catalog.
Paid to
0x6D9F318463168fF637b50E5b9a21392e97c7c167

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.

{
  "error": "Payment required",
  "accepts": [
    {
      "asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
      "extra": {
        "name": "USD Coin",
        "version": "2"
      },
      "payTo": "0x6D9F318463168fF637b50E5b9a21392e97c7c167",
      "amount": "15000",
      "scheme": "exact",
      "network": "eip155:8453",
      "mimeType": "application/json",
      "resource": "https://presign.hergertsynthora.com/service",
      "description": "Pre-sign security verdict for autonomous agents: before an agent SIGNS and settles a transaction, get an allow/warn/block verdict with reasons. Decodes the calldata to catch UNLIMITED approvals (spender can drain the token without further signatures), and cross-checks the token (honeypot, mintable, pausable, hidden owner, blacklist, buy/sell tax via GoPlus) and the spender/recipient (phishing, blacklist, sanctions via GoPlus address-security + Chainalysis + TRM). Use it as a last-mile guard before approving a token or signing a tx. Ed25519-signed provenance. 0.015 USDC on Base. POST {\"chain\":\"base\",\"to\":\"0x..\",\"data\":\"0x..\"} to verify a tx before signing, or {\"chain\":\"base\",\"token\":\"0x..\"} to verify a token before approving.",
      "maxAmountRequired": "15000",
      "maxTimeoutSeconds": 300
    }
  ],
  "freeTier": {
    "note": "send header X-WALLET: 0x<your Base address> for a free trial",
    "header": "X-WALLET",
    "callsPerWallet": 3
  },
  "resource": {
    "url": "https://presign.hergertsynthora.com/service",
    "mimeType": "application/json",
    "description": "Pre-sign security verdict for autonomous agents: before an agent SIGNS and settles a transaction, get an allow/warn/block verdict with reasons. Decodes the calldata to catch UNLIMITED approvals (spender can drain the token without further signatures), and cross-checks the token (honeypot, mintable, pausable, hidden owner, blacklist, buy/sell tax via GoPlus) and the spender/recipient (phishing, blacklist, sanctions via GoPlus address-security + Chainalysis + TRM). Use it as a last-mile guard before approving a token or signing a tx. Ed25519-signed provenance. 0.015 USDC on Base. POST {\"chain\":\"base\",\"to\":\"0x..\",\"data\":\"0x..\"} to verify a tx before signing, or {\"chain\":\"base\",\"token\":\"0x..\"} to verify a token before approving."
  },
  "extensions": {
    "bazaar": {
      "info": {
        "input": {
          "body": {
            "to": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
            "data": "0x095ea7b30000000000000000000000001111111111111111111111111111111111111111ffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff",
            "chain": "base"
          },
          "type": "http",
          "method": "POST",
          "bodyType": "json"
        },
        "output": {
          "type": "json",
          "example": {
            "ok": true,
            "niche": "presign",
            "result": {
              "chain": "base",
              "intent": "approve(address,uint256)",
              "reasons": [
                "APPROVE ILIMITADO a 0x1111...: el spender podra vaciar el token sin mas firmas"
              ],
              "spender": "0x1111...",
              "verdict": "block",
              "token_flags": {
                "trust_list": true,
                "is_honeypot": false
              },
              "spender_risk": {
                "address": "0x1111...",
                "chainalysis_sanctioned": false
              },
              "checked_token": "0x8335..."
            }
          }
        }
      },
      "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": {
                  "to": {
                    "type": "string",
                    "description": "Target contract of the tx to be signed (0x...); for approve/transfer this is the token being approved/moved"
                  },
                  "data": {
                    "type": "string",
                    "description": "Raw calldata (0x...) of the tx to be signed — decoded to detect unlimited approvals and the spender/recipient"
                  },
                  "chain": {
                    "enum": [
                      "base",
                      "ethereum"
                    ],
                    "type": "string",
                    "description": "Chain (default base)"
                  },
                  "token": {
                    "type": "string",
                    "description": "Token contract to verify before approving (0x...); use instead of to/data when you only want a token check"
                  }
                }
              },
              "type": {
                "type": "string",
                "const": "http"
              },
              "method": {
                "enum": [
                  "POST",
                  "PUT",
                  "PATCH"
                ],
                "type": "string"
              },
              "bodyType": {
                "enum": [
                  "json",
                  "form-data",
                  "text"
                ],
                "type": "string"
              }
            },
            "additionalProperties": false
          },
          "output": {
            "type": "object",
            "required": [
              "type"
            ],
            "properties": {
              "type": {
                "type": "string"
              },
              "example": {
                "ok": {
                  "type": "boolean"
                },
                "type": "object",
                "niche": {
                  "type": "string"
                }
              }
            }
          }
        }
      }
    }
  },
  "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.

0.015USDC≈ $0.015 USD
on Base · exact scheme

Pay 0.015 USDC on Base to 0x6D9F…7c167. The signed payment is good for 5 minutes.

Paid to
0x6D9F…7c167
USD Coin contract
0x8335…02913
Payment window
5 minutes
As published
15000 smallest units
Buys
Pre-sign security verdict for autonomous agents: before an agent SIGNS and settles a transaction, get an allow/warn/block verdict with reasons. Decodes the calldata to catch UNLIMITED approvals (spender can drain the token without further signatures), and cross-checks the token (honeypot, mintable, pausable, hidden owner, blacklist, buy/sell tax via GoPlus) and the spender/recipient (phishing, blacklist, sanctions via GoPlus address-security + Chainalysis + TRM). Use it as a last-mile guard before approving a token or signing a tx. Ed25519-signed provenance. 0.015 USDC on Base. POST {"chain":"base","to":"0x..","data":"0x.."} to verify a tx before signing, or {"chain":"base","token":"0x.."} to verify a token before approving.
Returns
application/json
The catalog’s raw entry
[
  {
    "asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
    "extra": {
      "name": "USD Coin",
      "version": "2"
    },
    "payTo": "0x6D9F318463168fF637b50E5b9a21392e97c7c167",
    "amount": "15000",
    "scheme": "exact",
    "network": "eip155:8453",
    "mimeType": "application/json",
    "resource": "https://presign.hergertsynthora.com/service",
    "description": "Pre-sign security verdict for autonomous agents: before an agent SIGNS and settles a transaction, get an allow/warn/block verdict with reasons. Decodes the calldata to catch UNLIMITED approvals (spender can drain the token without further signatures), and cross-checks the token (honeypot, mintable, pausable, hidden owner, blacklist, buy/sell tax via GoPlus) and the spender/recipient (phishing, blacklist, sanctions via GoPlus address-security + Chainalysis + TRM). Use it as a last-mile guard before approving a token or signing a tx. Ed25519-signed provenance. 0.015 USDC on Base. POST {\"chain\":\"base\",\"to\":\"0x..\",\"data\":\"0x..\"} to verify a tx before signing, or {\"chain\":\"base\",\"token\":\"0x..\"} to verify a token before approving.",
    "maxAmountRequired": "15000",
    "maxTimeoutSeconds": 300
  }
]

Extensions

{
  "bazaar": {
    "info": {
      "input": {
        "body": {
          "to": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
          "data": "0x095ea7b30000000000000000000000001111111111111111111111111111111111111111ffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff",
          "chain": "base"
        },
        "type": "http",
        "method": "POST",
        "bodyType": "json"
      },
      "output": {
        "type": "json",
        "example": {
          "ok": true,
          "niche": "presign",
          "result": {
            "chain": "base",
            "intent": "approve(address,uint256)",
            "reasons": [
              "APPROVE ILIMITADO a 0x1111...: el spender podra vaciar el token sin mas firmas"
            ],
            "spender": "0x1111...",
            "verdict": "block",
            "token_flags": {
              "trust_list": true,
              "is_honeypot": false
            },
            "spender_risk": {
              "address": "0x1111...",
              "chainalysis_sanctioned": false
            },
            "checked_token": "0x8335..."
          }
        }
      }
    },
    "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": {
                "to": {
                  "type": "string",
                  "description": "Target contract of the tx to be signed (0x...); for approve/transfer this is the token being approved/moved"
                },
                "data": {
                  "type": "string",
                  "description": "Raw calldata (0x...) of the tx to be signed — decoded to detect unlimited approvals and the spender/recipient"
                },
                "chain": {
                  "enum": [
                    "base",
                    "ethereum"
                  ],
                  "type": "string",
                  "description": "Chain (default base)"
                },
                "token": {
                  "type": "string",
                  "description": "Token contract to verify before approving (0x...); use instead of to/data when you only want a token check"
                }
              }
            },
            "type": {
              "type": "string",
              "const": "http"
            },
            "method": {
              "enum": [
                "POST",
                "PUT",
                "PATCH"
              ],
              "type": "string"
            },
            "bodyType": {
              "enum": [
                "json",
                "form-data",
                "text"
              ],
              "type": "string"
            }
          },
          "additionalProperties": false
        },
        "output": {
          "type": "object",
          "required": [
            "type"
          ],
          "properties": {
            "type": {
              "type": "string"
            },
            "example": {
              "ok": {
                "type": "boolean"
              },
              "type": "object",
              "niche": {
                "type": "string"
              }
            }
          }
        }
      }
    }
  }
}

Provenance

Seen in the source catalog
2026-09-12 17:21Z
Last indexed by Roundhouse
2026-09-24 13:50Z
Last enriched (probe, favicon, geo)
2026-09-14 10:45Z
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. 12 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 presign.hergertsynthora.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=presign.hergertsynthora.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://presign.hergertsynthora.com/service, 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.