OpenAI API
./ThinkGPT-5 series models, embeddings, and the Responses API with native MCP and tool use
OpenAPIACPMPP
$ protocol support
$ payment protocols
ACPAgentic Commerce ProtocolOpenAI, Stripe · commerce
Agent-initiated checkout against a merchant using scoped delegated payment tokens, merchant stays merchant of record
MPPMachine Payments ProtocolStripe, Tempo · settlement
HTTP-native standard for one-shot, recurring, and streaming machine payments across cards, stablecoins, and Lightning
$ agent access
authAPI Key
onboardingPartial — dashboard signup, then API key
tosNeutral — no bot restrictions
webhooksYes
free tierYes
billingpay-per-token
#llm#text#embeddings#reasoning#mpp#acp
https://platform.openai.com
// last verified 8/26/2026
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