Pre-sign security verdict for autonomous agents: before an agent SIGNS and settles a transaction, get anPOST /service · x402 API by presign
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.
What does this x402 API do?
Pre-sign security verdict for autonomous agents: before an agent SIGNS and settles a transaction, get an. This is an x402-gated POST API resource from presign. TOLL·402 did not invoke this route automatically because doing so was not considered safe. The listing records $0.015 USD-denominated per request on Base. No settled paid call has been verified.
- Published price
- $0.015 USD-denominated per request
- Networks
- Base
- Latest evidence
- TOLL·402 did not invoke this route automatically because doing so was not considered safe
- Resource ID
- 3f9b46e36440e5827ce0759d
Start with a quote-only recipe. Payment signing stays in your project.
const response = await fetch("https://presign.hergertsynthora.com/service", {
method: "POST",
headers: { "content-type": "application/json" },
body: JSON.stringify({
"replace": "with provider-approved input"
}),
});
console.log(response.status);
console.log(Object.fromEntries(response.headers));
console.log((await response.text()).slice(0, 1000));
// A valid 402 is a quote, not a completed paid call.Review the provider input schema before running this non-read-only method. No payment code is included.
- Observed in 402-index
Discovered through bazaar.
- Registry record checked
Registry health: degraded.
- Exact route checked
not safely testable · potentially-mutating-method:POST
- Origin reachable
HEAD https://presign.hergertsynthora.com/ returned 404.
What evidence supports this listing?
Each record has an exact-route quote outcome. Unresolved templates and potentially mutating methods are labeled instead of being invoked without provider-specific test input. A quote is still separate from a settled paid call. Read the discovery and verification methodology →
Which networks and payment options does it accept?
The normalized listing price is $0.015 USD-denominated per request. Raw protocol requirements remain visible below for implementation and audit use.