{"uid":"cap_jo5yY6pvbTvNn6yZCtWwj","slug":"market-intelligence-api-buy-prepaid-credit-pack-c3fbd92e","name":"Market Intelligence API – Buy Prepaid Credit Pack","description":"Prepaid API credits and API key for clients that cannot sign an x402 payment per call (most MCP clients): one payment buys credit ($5, $20 = $22 credit, $50 = $60) and returns an API key. Send it as X-API-Key on any paid route or MCP tool; each call costs its x402 price and failed calls are refunded. With your key in X-API-Key it tops that key up.","url":"https://api.marketintelligenceapi.com/api/v1/credits/buy/:usd?utm_source=zero.xyz","method":"GET","headers":{},"bodySchema":{"type":"object","$schema":"https://json-schema.org/draft/2020-12/schema","required":["input","output"],"properties":{"input":{"type":"object","required":["type","method"],"properties":{"type":{"type":"string","const":"http"},"method":{"enum":["GET"],"type":"string"},"pathParams":{"type":"object","required":["usd"],"properties":{"usd":{"enum":["5","20","50"],"type":"string","examples":["5"],"description":"Pack price in USD: 5, 20 or 50."}},"additionalProperties":false},"queryParams":{"type":"object","properties":{"name":{"type":"string","description":"Endpoint query parameter"}},"additionalProperties":false}},"additionalProperties":false},"output":{"type":"object","required":["type"],"properties":{"type":{"type":"string"},"example":{"description":"Example JSON response returned by this endpoint"}},"additionalProperties":true}},"additionalProperties":false},"responseSchema":null,"example":null,"exampleRequest":null,"tags":["x402"],"displayCostAmount":"5","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":"unknown","priceObserved":null,"sessionDeposit":null,"pricing":{"kind":"static","summary":"$5/call","primary":{"kind":"static","protocol":"x402","network":"base","amountUsd":"5","per":"call","confidence":"exact"},"accepted":[{"kind":"static","protocol":"x402","network":"base","amountUsd":"5","per":"call","confidence":"exact"}]},"paymentMethods":[{"uid":"pm_jXhplWJqml0UQJgn0_kmD","protocol":"x402","methodType":"crypto","chain":"base","mode":"charge","costAmount":"5","costPer":"request","priority":0,"asset":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","unit":"request","depositMicros":null,"planRef":null}],"brandName":null,"brandSlug":null,"brandBaseUrl":null,"brandDocsUrl":null,"whatItDoes":"Purchase a prepaid API credit pack ($5, $20, or $50) with a one-time payment and receive an API key for accessing paid market intelligence endpoints without per-call x402 payments.","exampleAgentPrompt":"Buy me a $20 prepaid credit pack on the Market Intelligence API so I can make market data calls without paying per request — I want the discounted $22 credit bundle.","exampleUseCases":[{"title":"Bootstrap agent with market data credits","prompt":"I need my AI agent to start pulling crypto and stock prices right away — buy a $5 credit pack on the Market Intelligence API and give me the API key it returns."},{"title":"Top up existing key with bulk discount","prompt":"Top up my existing Market Intelligence API key with the $50 credit pack so I get the $60 credit value — I want the best discount available."},{"title":"Onboard MCP client without per-call payments","prompt":"My MCP client can't do x402 payments on each call, so buy a $20 credit pack on the Market Intelligence API and return the API key I can set as X-API-Key for all my market data requests."}],"resultDescription":"Returns an API key that can be sent as X-API-Key on any paid Market Intelligence API route or MCP tool. The key carries a credit balance equal to the purchased pack value (e.g. $20 pack = $22 credit, $50 pack = $60 credit). Each subsequent paid API call deducts its x402 price from the balance; failed calls are refunded. If an existing API key is provided, the balance is topped up instead of issuing a new key.","failureModes":["Payment not received or insufficient USDC — no key returned, payment not processed","Invalid usd path parameter (not 5, 20, or 50) — request rejected","Network or provider error during payment processing — may require retry","Existing key not found when attempting top-up — new key may be issued instead"],"whenToPreferThis":"Use this endpoint when the calling client (especially MCP clients) cannot perform x402 per-call micropayments and needs a prepaid credit pool. Also prefer this when you want volume discounts ($20 → $22 credit, $50 → $60 credit) or want to avoid payment overhead on every individual market data call. If you can handle x402 per-call payments natively, you may call paid routes directly instead.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-10-13T12:44:24.215Z","isFirstParty":false,"canonicalSlug":"market-intelligence-api-buy-prepaid-credit-pack-c3fbd92e"}