{"uid":"cap_Pu81deA1_VQV53eMljzRZ","slug":"sovereign-engine-spend-cap-88d5aca9","name":"Sovereign Engine – Spend Cap","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/exec/spend-cap","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_a3eiu2_RBocAHh2_w8sSV","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":"Sets or enforces a per-call USDC spend cap for pay-per-call x402 execution primitives on the Sovereign Engine platform","exampleAgentPrompt":"Set a spend cap on my Sovereign Engine x402 account so each pay-per-call execution costs no more than $0.005 USDC on Base — I want to make sure my isolated code sandbox calls don't exceed that limit.","exampleUseCases":null,"resultDescription":"Returns a JSON object with a success boolean, a receipt_id UUID confirming the spend cap operation, and a data object with cap configuration details.","failureModes":["Insufficient USDC balance on Base — payment fails with 402 response","Invalid or malformed prompt payload — returns error in data field with success: false","Network timeout reaching the self-hosted facilitator — connection error","x402 payment verification failure — receipt_id not issued","Spend cap already at maximum allowed value — rejected with validation error"],"whenToPreferThis":"Use this endpoint when you need to enforce budget controls on per-call USDC payments for the Sovereign Engine's x402 execution primitives, particularly when running untrusted code in isolated Cloudflare sandboxes or triggering Bing RSS web searches and you want to prevent runaway microtransaction costs on the Base network.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-09-15T11:28:31.244Z","isFirstParty":false}