# ZuluWorksAI Trust Index — Credits Top-Up

> ZuluWorksAI Trust Index — Credits Top-Up is a paid API for AI agents from trust.zuluworksai.com, paid per call via x402, $1/call, status down (last checked 2026-10-23).

Credits an EVM wallet with USDC balance to fund subsequent API calls on the ZuluWorksAI trust-indexed endpoint directory.

## Facts

- Endpoint: POST https://trust.zuluworksai.com/api/credits/top-up?utm_source=zero.xyz
- Price: $1/call
- Payment: x402
- Status: down
- Last checked: 2026-10-23
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/zuluworksai-trust-index-credits-top-up-bb8214a6
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_BY-rthcsrnHhSeRpu0KJr

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 zuluworksai-trust-index-credits-top-up-bb8214a6 -d '<json body>'
```

Example prompt: Top up my ZuluWorksAI trust index account — my EVM wallet is 0x4e2cf38b07fc5778970efbd808a773863db2cfe8 — I want to deposit 1 USDC so I have credits to query the AI endpoint directory.

## When to prefer this

Use this endpoint when an EVM wallet needs USDC credits to fund subsequent calls to the ZuluWorksAI AI endpoint trust index directory. This is the required on-ramp before any trust-index query or endpoint lookup can be made — prefer it over manual transfers when integrating agent-automated top-up flows using x402 micropayments.

## Known failure modes

- Invalid or malformed EVM wallet address — request rejected
- Payment not received or x402 payment header missing — credit not applied
- Insufficient USDC sent — balance not updated
- Network/chain issues causing payment confirmation delay
- Wallet address not recognised on supported network

## How this service works

Trust-ranked public index of 1141 AI agent endpoints (x402, MCP, A2A). 1089 confirmed alive right now, 52 dead-but-listed.

## Output

Returns a confirmation object with ok: true, the credited wallet address, the new balance in both atomic units (balance_atom) and USDC (balance_usdc), and the amount deposited in USDC (deposit_usdc).

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "required": [
  "wallet"
 ],
 "properties": {
  "wallet": {
   "type": "string",
   "description": "EVM wallet to credit (0x...)"
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "ok": {
   "type": "boolean",
   "example": true
  },
  "wallet": {
   "type": "string",
   "example": "0x4e2cf38b07fc5778970efbd808a773863db2cfe8"
  },
  "balance_atom": {
   "type": "integer",
   "example": 1000000
  },
  "balance_usdc": {
   "type": "number",
   "example": 1
  },
  "deposit_usdc": {
   "type": "number",
   "example": 1
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/zuluworksai-trust-index-credits-top-up-bb8214a6/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from trust.zuluworksai.com](https://www.zero.xyz/host/trust.zuluworksai.com/llms.txt)