Marketplace · API · x402

synap402.com/api/billing/x402/models/gpt-oss-20b/chat/completions

Synap by Linkrra · OpenAI gpt-oss-20b — fast + cheap general model. OpenAI-compatible inference: 64K context, dedicated GPUs we operate, native 4-bit MXFP4. Pay per call in USDC on any network offered in the payment challenge; no account, no API key. First call free per new wallet (cheap models, up to 512 tokens, non-streaming, daily cap). From $0.001 per call. Streaming supported.

Endpoint	`https://synap402.com/api/billing/x402/models/gpt-oss-20b/chat/completions`
Trust	Not checked yet
Pricing	Pay per call with x402, no account. Call it to get an exact quote before paying.
network	eip155:8453
scheme	exact
pay to	0x1f291B5B41B6E5ffbDc4f2ad8b5F45811438184a
method	POST
last updated	2026-11-14T03:07:33.741Z

Use it

Call it (an x402 client pays automatically)

curl -i https://synap402.com/api/billing/x402/models/gpt-oss-20b/chat/completions
# 402 reply -> sign PAYMENT-REQUIRED with an x402 client (e.g. @x402/fetch) -> retry with PAYMENT-SIGNATURE

This listing as JSON

curl https://aipaygen.com/v1/catalog/api/x402-42be35f1f84f7792

Search the whole marketplace from your agent (MCP)

{
  "mcpServers": {
    "aipaygen": {
      "url": "https://aipaygen.com/mcp"
    }
  }
}