For agents: JSON · MCP

OpenAI gpt-5

x402Grade DLast checked 3 hours ago

POST https://openai.mm.family/x402/v1/models/gpt-5/chat/completions

gpt-5: OpenAI GPT 5 chat completions, USDC per 1M tokens in / out: Flex (default; slower, may answer 429 or 503) 0.625 / 5.0, Standard (service_tier default) 1.25 / 10.0, Fast (service_tier fast; lowest latency) 2.5 / 20.0, plus 0.0025 per call on Base or 0.002 on Solana. Reasoning levels: minimal, low, medium, high (send model gpt-5:<level> or reasoning_effort). Quote charges input plus 10% of max_tokens as output (the model may use all of it); reasoning tokens count as output and come first, so send max_tokens >= 128 for short answers. Empty answers are free. Sheet: https://openai.mm.family/x402/pricing

Price$0.0026per model request · paid in USD on Base

Uptime100%

4/4 probes · 566 ms

Score54Grade D

Paid usage, 30 days0payers · 0 calls

Warnings

Price mismatch The live price differs from the catalogue listing.

How to buy

This endpoint takes pay-per-call payments over x402. Call it once without paying to see its live price; any x402 client then pays and retries automatically.

curl -i -X POST "https://openai.mm.family/x402/v1/models/gpt-5/chat/completions"
# HTTP/1.1 402 Payment Required: price, asset and payTo are in the response

Recent checks

Checked (UTC)	Result	Status	Time	Live price
2026-10-11 08:45	Valid 402	402	475 ms	$0.001
2026-10-11 04:15	Valid 402	402	657 ms	$0.001
2026-10-11 00:00	Valid 402	402	789 ms	$0.001
2026-10-10 19:00	Valid 402	402	451 ms	$0.001

Receipts

No test purchases yet. Graded test purchases are next on our list; until then every number here comes from unpaid checks.

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