# AgentPay Credit Purchase — Standard Tier

> AgentPay Credit Purchase — Standard Tier is a paid API for AI agents from agentpay.help, paid per call via x402, $5/call, status unknown (last checked 2026-10-11).

Purchase 600 AgentPay credits for $5 USDC on Base, returning a bearer token usable across 28 pay-per-call AI microservices without requiring an account or API key.

## Facts

- Endpoint: GET https://agentpay.help/v1/buy-credits?utm_source=zero.xyz
- Price: $5/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-11
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/agentpay-credit-purchase-standard-tier-62756c64
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_2bQ_4AYIeXnoKcFmaYLGy

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 agentpay-credit-purchase-standard-tier-62756c64
```

Example prompt: Buy me the standard tier of AgentPay credits — spend $5 USDC from my Base wallet — so I have a fresh token with 600 credits ready to call their AI services.

## When to prefer this

Choose this endpoint when you need frictionless, account-free access to AgentPay's suite of AI microservices and want to pay in USDC on Base via the x402 protocol. It is ideal for autonomous agents that need to self-fund, for one-off tasks where account creation is undesirable, or for environments where managing API keys is impractical. Prefer this over other credit-purchasing flows when operating on Base and when the standard 600-credit bundle at $5 USDC meets your usage needs.

## Known failure modes

- Insufficient USDC balance in the paying wallet — payment rejected by x402 protocol
- Invalid or malformed tier value — server returns validation error
- x402 payment protocol handshake failure — network or Base chain congestion
- Duplicate payment submission — non-idempotent endpoint may charge twice without issuing a second token
- Token generation failure after successful payment — credits may be deducted but token not returned

## How this service works

Pay-per-call AI services via the 402 Payment Required protocol. No accounts, no API keys — just USDC on Base.

## Output

Returns a JSON object with a bearer token string (prefixed ap_...) and a credit balance of 600, which can be used to authenticate subsequent calls to any of AgentPay's 28 AI microservices without further account registration.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "tier": {
   "enum": [
    "standard"
   ],
   "type": "string"
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "token": "ap_...",
  "credits": 600
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/agentpay-credit-purchase-standard-tier-62756c64/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from agentpay.help](https://www.zero.xyz/host/agentpay.help/llms.txt)