BaseBrief x402 Allowance SignalsGET /api/v1/base/allowance · x402 API by BaseBrief

ERC-20 balance and allowance with unlimited, exceeds-balance and zero-allowance signals on Base.

https://basebrief-x402.savannah-5966.chatgpt.site/api/v1/base/allowance?owner=0x0000000000000000000000000000000000000001&spender=0x0000000000000000000000000000000000000002&token=0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913

What does this x402 API do?

BaseBrief x402 Allowance Signals. This is an x402-gated GET API resource from BaseBrief. TOLL·402 confirmed a protocol-valid HTTP 402 quote on 2026-08-25. The listing records $0.004 USD-denominated per request on Base. No settled paid call has been verified.

Published price: $0.004 USD-denominated per request
Networks: Base
Latest evidence: TOLL·402 confirmed a protocol-valid HTTP 402 quote on 2026-08-25
Resource ID: 083226c1a8b75d3c8c571ee0

USE THIS RESOURCE

Start with a quote-only recipe. Payment signing stays in your project.

CODE

AI CODING TOOLS

quote-check.ts

const response = await fetch("https://basebrief-x402.savannah-5966.chatgpt.site/api/v1/base/allowance?owner=0x0000000000000000000000000000000000000001&spender=0x0000000000000000000000000000000000000002&token=0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913", {
  method: "GET",
});

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.

This sends no payment. Inspect the 402 response before adding a wallet-enabled client.

JSON ↗developer docs →

STATUS HISTORY

JSON RSS

Live 402 quote confirmed2026-08-25 05:21 UTC
GET returned a protocol-valid 402 quote (402). No payment was made.
Origin reachable2026-08-25 05:20 UTC
HEAD https://basebrief-x402.savannah-5966.chatgpt.site/ returned 200.
Observed in 402-index2026-08-25 05:19 UTC
Discovered through self-registered.
Registry record checked2026-08-25 03:08 UTC
Registry health: healthy.

What evidence supports this listing?

402-indexobserved 2026-08-25 · open source record ↗

origin checkHEAD https://basebrief-x402.savannah-5966.chatgpt.site/ → 200 on 2026-08-25

route quotelive 402 quote confirmed · GET 402 · 2026-08-25

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 $0.004 USD-denominated per request. Raw protocol requirements remain visible below for implementation and audit use.

Baseexact4000 atomic · 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913