# x402factory GPT Wrapper (Solana x402 Payments)

> x402factory GPT Wrapper (Solana x402 Payments) is a paid API for AI agents from x402factory.ai, paid per call via x402, $0.01/call, status unknown (last checked 2026-09-13).

Calls OpenAI GPT models via a Solana x402-payment-gated API, with dynamic per-token pricing, agent creation, and agent listing capabilities.

## Facts

- Endpoint: POST https://x402factory.ai/solana/llm/gpt/AW5793DBAYAHSEHJTU
- Price: $0.01/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-13
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/x402factory-ai-x402factory-5-335d65d3
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_ydp7_rERXIUyHz6Qfo3PO

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 x402factory-ai-x402factory-5-335d65d3 -d '<json body>'
```

Example prompt: Ask GPT-5-mini to write me a 3-paragraph summary of the future of decentralized finance, using up to 2000 output tokens and capping my input at 500 tokens — pay for it with my Solana wallet via x402.

## When to prefer this

Use this endpoint when you need to call GPT models and want to pay per-request in USDC via the Solana blockchain using the x402 payment protocol, without managing traditional OpenAI API keys. Especially useful for agents that need metered, on-chain-auditable LLM usage, or for creating and managing reusable custom GPT agents with preprompts paid in crypto.

## Known failure modes

- Input tokens exceed max_input_tokens cap — server returns an error instead of under-pricing
- x402 payment not received or insufficient USDC — payment rejected before request is processed
- Invalid model name specified — API returns an error
- Message too long with no max_input_tokens set — may cause unexpected pricing
- custom_id not found when invoking a custom agent — returns not found error
- OpenAI API downstream failure — returns 5xx error

## How this service works

Solana GPT wrapper API using x402 payments. Default direct call: model gpt-5-mini, max_output_tokens=2000, fixed price 0.01 USDC for up to 1000 input tokens. For all other settings the price is computed per model as (input_tokens * input_price_per_million + max_output_tokens * output_price_per_million) / 1,000,000, with a minimum of 0.001 USDC and always rounded up to 6 decimals. Optional max_input_tokens lets you cap the input tokens used for pricing; if the message is longer than this cap the server returns an error instead of under-pricing. Optional action=message (or omitting action) performs a direct GPT call with the given message. Optional action=create creates a custom agent with the given message as preprompt for 0.001 USDC (no OpenAI call), stores a base_price_usdc using (max_input_tokens_for_agent or 1000) + preprompt + max_output_tokens, and returns a custom_id. Optional action=list lists up to 100 recent custom agents for the paying wallet for 0.001 USDC without calling OpenAI. Custom agents can be called via POST /solana/llm/gpt with custom_id, or POST /solana/llm/gpt/{custom_id}. Each custom agent has a fixed price per call based on its stored preprompt, model, max_output_tokens and max_input_tokens; if the runtime message is longer than max_input_tokens the server returns an error. Custom LLM agent AW5793DBAYAHSEHJTU on Solana. Model gpt-5-mini, max_input_tokens=5000, max_output_tokens=5300. Preprompt preview (first 150 chars): "Here is a prompt i received from a client, we going to forward it to next step but i need to add some info, your task is to exactly reply like this: C". Pricing mode: agent-per-token. Prepaid price (x402) for this request: 0.017925 USDC. Estimated input tokens for pricing: 5061.

## Output

Returns the GPT model's text completion response. For action=create, returns a custom_id for the new agent and stores base pricing. For action=list, returns up to 100 recent custom agents associated with the paying wallet, each with their configuration and pricing details.

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/x402factory-ai-x402factory-5-335d65d3/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from x402factory.ai](https://www.zero.xyz/host/x402factory.ai/llms.txt)