# adctx Payment Verification

> adctx Payment Verification is a paid API for AI agents from t.adctx.com, paid per call via x402, $0.05/call, status unknown (last checked 2026-10-11).

Checks whether a given Base blockchain address (x402 seller payTo) has actually received on-chain payments, classifying it as paid, single-payer, self-funded, dust-only, or silent, with payer counts and USDC received.

## Facts

- Endpoint: GET https://t.adctx.com/check?utm_source=zero.xyz
- Price: $0.05/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-11
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/adctx-payment-verification-fbe3ee35
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_V7tKgl-vTyPzk22V7NT5-

Status and success rate cover calls made through Zero and Zero's own probes. Third-party monitors may report differently.

## How to call it through Zero

Zero handles the 402 payment challenge and records the run. With the Zero CLI installed (`npm i -g @zeroxyz/cli`):

```sh
zero fetch --capability adctx-payment-verification-fbe3ee35
```

Example prompt: Can you check whether the x402 seller at address 0x1234567890abcdef1234567890abcdef12345678 is actually getting paid on Base, or if it's just self-funded or silent?

## When to prefer this

Use this endpoint when you need a fast, pre-computed on-chain verdict about whether an x402 seller's payTo address has genuine external payers on Base — especially useful for filtering self-funded or inactive sellers from a marketplace or catalogue. It is purpose-built for the x402 ecosystem and uses a consistent measurement window across all sellers, making it ideal for comparative analysis rather than raw blockchain queries.

## Known failure modes

- Invalid or malformed Ethereum address (not matching 0x + 40 hex chars) returns validation error
- Address not found in the Base chain data returns silent verdict or no-data response
- Base network read latency or unavailability may delay or fail responses
- Rate limiting or payment failure at $0.05 USDC per call may block access

## How this service works

Is this x402 seller actually paid? Give a payTo address, get its verdict from our own read of Base: paid, single-payer, self-funded, dust-only or silent, with the number of payers, how many of them the seller itself funded, and the USDC that arrived in a fixed window every seller is measured over. The catalogue's own call counts are not payments: across 1 397 sellers we read both ways, 312 are called and receive nothing on chain.

## Output

Returns a payment verdict (paid, single-payer, self-funded, dust-only, or silent) for the queried Base address, along with the total number of unique payers, how many of those payers were the seller themselves (self-funded count), and the total USDC received within a fixed measurement window used consistently across all 1,397 sellers in the catalogue.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "$schema": "https://json-schema.org/draft/2020-12/schema",
 "required": [
  "input"
 ],
 "properties": {
  "input": {
   "type": "object",
   "required": [
    "type",
    "method"
   ],
   "properties": {
    "type": {
     "type": "string",
     "const": "http"
    },
    "method": {
     "enum": [
      "GET"
     ],
     "type": "string"
    },
    "queryParams": {
     "type": "object",
     "required": [
      "address"
     ],
     "properties": {
      "address": {
       "type": "string",
       "pattern": "^0x[a-fA-F0-9]{40}$",
       "description": "the seller's payTo address"
      }
     },
     "additionalProperties": false
    }
   },
   "additionalProperties": false
  },
  "output": {
   "type": "object",
   "required": [
    "type"
   ],
   "properties": {
    "type": {
     "type": "string"
    },
    "example": {
     "type": "object"
    }
   }
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/adctx-payment-verification-fbe3ee35/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from t.adctx.com](https://www.zero.xyz/host/t.adctx.com/llms.txt)