{"uid":"cap_Y4XilaXWwR8eBDWCAlYxF","slug":"sovereign-engine-stt-0b71ea39","name":"Sovereign Engine STT","description":"Pay-per-call x402 execution primitives (USDC on Base). Code execution runs in isolated Cloudflare Dynamic Worker sandboxes (JavaScript + Python, network blocked). Web search backed by Bing RSS. Self-hosted facilitator.","url":"https://api.zuluworksai.com/cf/stt","method":"POST","headers":{},"bodySchema":{"type":"object","properties":{"prompt":{"type":"string","description":"The input prompt"}}},"responseSchema":{"type":"json","example":{"data":{},"success":true,"receipt_id":"uuid"}},"example":null,"exampleRequest":null,"tags":["x402"],"displayCostAmount":"0.005","displayCostAsset":"USDC","priceDynamic":false,"priceHint":null,"priceStatus":"priced","priceSource":"probe","requiresHandshake":false,"reviewCount":0,"rating":{"score":"0.00","successRate":"0.00","reviews":0,"stars":null,"state":"unrated"},"availabilityStatus":"down","priceObserved":null,"sessionDeposit":null,"pricing":{"kind":"static","summary":"$0.005/call","primary":{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.005","per":"call","confidence":"exact"},"accepted":[{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.005","per":"call","confidence":"exact"}]},"paymentMethods":[{"uid":"pm_Ih4-cTgs3CaO-33vNd7ZZ","protocol":"x402","methodType":"crypto","chain":"base","mode":"charge","costAmount":"0.005","costPer":"request","priority":0,"asset":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","unit":"request","depositMicros":null,"planRef":null}],"brandName":null,"brandSlug":null,"brandBaseUrl":null,"brandDocsUrl":null,"whatItDoes":"Speech-to-text transcription endpoint accepting a prompt/audio input and returning transcribed text, paid per-call via x402 USDC on Base","exampleAgentPrompt":"Can you transcribe this audio for me — here's the speech input: 'Meeting notes from Tuesday afternoon, project status update.'","exampleUseCases":null,"resultDescription":"Returns a JSON object with a success boolean, a data field containing the transcription result, and a receipt_id UUID for payment tracking.","failureModes":["Payment not received or insufficient USDC balance — 402 Payment Required","Invalid or missing prompt field — 400 Bad Request","Audio content not parseable or unsupported format — returns success: false with empty data","Cloudflare Worker sandbox timeout or resource limit exceeded — 500 error","Facilitator or x402 payment verification failure — transaction rejected"],"whenToPreferThis":"Choose this endpoint when you need pay-per-call speech-to-text transcription without a subscription, billed in USDC micropayments over x402 on Base. Ideal for agents that require on-demand, isolated transcription with no rate-limit tiers and verifiable on-chain payment receipts.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-09-15T16:27:04.280Z","isFirstParty":false}