Pre-sign security verdict for autonomous agents: before an agent SIGNS and settles a trans
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.
Provider
presign.hergertsynthora.com · discovered, not yet claimed by its owner
Payment (x402 accepts[])
[
{
"scheme": "exact",
"network": "eip155:8453",
"payTo": "0x6D9F318463168fF637b50E5b9a21392e97c7c167",
"asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
"amount": "15000",
"maxTimeoutSeconds": 300
}
]Output schema
{
"bazaar": {
"info": {
"input": {
"body": {
"chain": "base",
"data": "0x095ea7b30000000000000000000000001111111111111111111111111111111111111111ffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff",
"to": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913"
},
"bodyType": "json",
"method": "POST",
"type": "http"
},
"output": {
"example": {
"niche": "presign",
"ok": true,
"result": {
"chain": "base",
"checked_token": "0x8335...",
"intent": "approve(address,uint256)",
"reasons": [
"APPROVE ILIMITADO a 0x1111...: el spender podra vaciar el token sin mas firmas"
],
"spender": "0x1111...",
"spender_risk": {
"address": "0x1111...",
"chainalysis_sanctioned": false
},
"token_flags": {
"is_honeypot": false,
"trust_list": true
},
"verdict": "block"
}
},
"type": "json"
}
},
"schema": {
"$schema": "https://json-schema.org/draft/2020-12/schema",
"properties": {
"input": {
"additionalProperties": false,
"properties": {
"body": {
"properties": {
"chain": {
"description": "Chain (default base)",
"enum": [
"base",
"ethereum"
],
"type": "string"
},
"data": {
"description": "Raw calldata (0x...) of the tx to be signed — decoded to detect unlimited approvals and the spender/recipient",
"type": "string"
},
"to": {
"description": "Target contract of the tx to be signed (0x...); for approve/transfer this is the token being approved/moved",
"type": "string"
},
"token": {
"description": "Token contract to verify before approving (0x...); use instead of to/data when you only want a token check",
"type": "string"
}
},
"type": "object"
},
"bodyType": {
"enum": [
"json",
"form-data",
"text"
],
"type": "string"
},
"method": {
"enum": [
"POST",
"PUT",
"PATCH"
],
"type": "string"
},
"type": {
"const": "http",
"type": "string"
}
},
"required": [
"type",
"method",
"bodyType",
"body"
],
"type": "object"
},
"output": {
"properties": {
"example": {
"niche": {
"type": "string"
},
"ok": {
"type": "boolean"
},
"type": "object"
},
"type": {
"type": "string"
}
},
"required": [
"type"
],
"type": "object"
}
},
"required": [
"input"
],
"type": "object"
}
}
}Use it
curl
curl "https://presign.hergertsynthora.com/service" # -> 402 Payment Required, accepts[] lists how to pay # retry with a PAYMENT-SIGNATURE (or PAYMENT header) once paid
JavaScript
const res = await fetch("https://presign.hergertsynthora.com/service");
if (res.status === 402) {
const { accepts } = await res.json();
// pay one of accepts[] via an x402 client, then retry with the payment header
}Python
import httpx
res = httpx.get("https://presign.hergertsynthora.com/service")
if res.status_code == 402:
accepts = res.json()["accepts"]
# pay one of accepts[] via an x402 client, then retry with the payment headerMachine-readable
Everything on this page is also available as clean JSON at /resources/13534.json, and this resource appears in /discovery/resources and /discovery/search.