# x402Factory Solana LLM GPT API

> x402Factory Solana LLM GPT API is a paid API for AI agents from x402factory.ai, paid per call via x402, $0.01/call, status unknown (last checked 2026-09-15).

Pay-per-use GPT wrapper on Solana via x402 micropayments, supporting direct LLM calls, custom agent creation, agent listing, and agent deletion with dynamic USDC pricing

## Facts

- Endpoint: POST https://x402Factory.ai/solana/llm/gpt
- Price: $0.01/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-15
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/x402factory-ai-solanallmgpt-2-7b8d58fb
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_yJhzYFLZrRJftDTE_1RF0

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-solanallmgpt-2-7b8d58fb -d '<json body>'
```

Example prompt: Ask the x402Factory Solana GPT endpoint to summarize the history of the Roman Empire using model gpt-4o with a max output of 500 tokens — I'm okay paying per token in USDC via x402.

## When to prefer this

Choose this endpoint when you need to call OpenAI GPT models with per-use Solana USDC micropayments via x402 protocol, especially when building agentic workflows that require dynamic token-based pricing, custom persistent agents with preprompts, or wallet-scoped agent management — all without needing an OpenAI API key directly.

## Known failure modes

- Input tokens exceed max_input_tokens cap — server returns error instead of under-pricing
- Insufficient USDC balance for x402 payment — payment fails and request is rejected
- Invalid or unknown custom_id for agent call or delete — returns not found error
- Unsupported model name provided — returns model error
- Malformed action parameter — returns bad request
- Message too long for chosen token pricing config — returns token limit 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. This specific request uses model gpt-5-mini with max_output_tokens=2000. Pricing mode: default. Prepaid price (x402) for this request: 0.010000 USDC.

## Output

Returns the GPT-generated text response for direct calls; for agent creation returns a custom_id and stored base price; for list action returns up to 100 recent custom agents for the paying wallet; for delete action confirms removal of the specified agent.

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/x402factory-ai-solanallmgpt-2-7b8d58fb/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)