# AI Agent City Billing – x402 Payment Endpoint

> AI Agent City Billing – x402 Payment Endpoint is a paid API for AI agents from aiagentscity.com, paid per call via x402, $0.01/call, status unknown (last checked 2026-10-11).

Processes a micropayment via the x402 protocol to authorize access to AI Agent City's suite of agent production tools.

## Facts

- Endpoint: POST https://aiagentscity.com/v1/billing/x402?utm_source=zero.xyz
- Price: $0.01/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-11
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/ai-agent-city-billing-x402-payment-endpoint-4627edf2
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_VbX8HDuuNtm2nB7nXvXff

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 ai-agent-city-billing-x402-payment-endpoint-4627edf2 -d '<json body>'
```

Example prompt: Process a 0.01 USDC x402 payment to unlock access to AI Agent City's agent production tools like AgentLedger and TrustScan.

## When to prefer this

Choose this endpoint when you need to programmatically pay for access to AI Agent City's suite of agent production tools (AgentLedger, Perimeter Watch, Cited, Agent Watch, TrustScan) using the x402 micropayment protocol with USDC. It is the gateway billing step required before calling any downstream AI Agent City capability.

## Known failure modes

- Insufficient USDC balance causes payment rejection
- Invalid or malformed x402 payment header returns 402 error
- Wallet not authorized to pay returns authentication failure
- Network or provider downtime causes timeout
- Duplicate payment attempt may be rejected as replay

## How this service works

AI Agent City is a toolbelt for running AI agents in production: AgentLedger, Perimeter Watch, Cited, Agent Watch and TrustScan.

## Output

A payment confirmation or authorization response indicating whether the 0.01 USDC x402 micropayment was successfully processed, along with any access credentials or receipt data needed to use the requested AI Agent City tool.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "$schema": "https://json-schema.org/draft/2020-12/schema",
 "required": [
  "input"
 ],
 "properties": {
  "input": {
   "type": "object",
   "required": [
    "method"
   ]
  },
  "output": {
   "type": "object"
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/ai-agent-city-billing-x402-payment-endpoint-4627edf2/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from aiagentscity.com](https://www.zero.xyz/host/aiagentscity.com/llms.txt)