{"uid":"cap_9bRAFD61AniHdFHbYWNXJ","slug":"quantaflow-x402-api-gateway-alchemy-base-sepolia-11cd0df8","name":"QuantaFlow x402 API Gateway — Alchemy Base Sepolia","description":"Every request, a quantum of value. x402 protocol-based payment endpoint for web3/DeFi tools.","url":"https://quanta-roan.vercel.app/api/service/alchemy-base-sepolia?utm_source=zero.xyz","method":"POST","headers":{},"bodySchema":{"type":"object","properties":{"body":{"type":"string","description":"Optional JSON body forwarded to POST requests."},"path":{"type":"string","description":"Path below the selected upstream origin."},"query":{"type":"object"},"method":{"enum":["GET","POST"],"type":"string"}}},"responseSchema":{"description":"The upstream response body and content type are passed through after successful payment."},"example":null,"exampleRequest":null,"tags":["x402"],"displayCostAmount":"0.01","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":"$0.01/call","primary":{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.01","per":"call","confidence":"exact"},"accepted":[{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.01","per":"call","confidence":"exact"}]},"paymentMethods":[{"uid":"pm_M3Bo5QRNTDG_JbE18H6ws","protocol":"x402","methodType":"crypto","chain":"base","mode":"charge","costAmount":"0.01","costPer":"request","priority":0,"asset":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","unit":"request","depositMicros":null,"planRef":null}],"brandName":null,"brandSlug":null,"brandBaseUrl":null,"brandDocsUrl":null,"whatItDoes":"Proxies requests to Alchemy's Base Sepolia RPC/API endpoint via the x402 micropayment protocol, charging $0.01 USDC per call","exampleAgentPrompt":"Forward a JSON-RPC call to Alchemy's Base Sepolia endpoint — use path /v2/eth_blockNumber with no body — and pay the per-request fee automatically via x402.","exampleUseCases":[{"title":"Check latest Base Sepolia block","prompt":"Query the latest block number on the Base Sepolia testnet through the Alchemy gateway — just send eth_blockNumber with no extra params."},{"title":"Fetch testnet transaction receipt","prompt":"I need the transaction receipt for hash 0xabc123... on Base Sepolia — route it through the Alchemy proxy using path /v2/eth_getTransactionReceipt."},{"title":"Read smart contract state on testnet","prompt":"Call eth_call on Base Sepolia to read the balanceOf function from contract 0xDEAD...BEEF for address 0x1234... — forward it via the Alchemy Base Sepolia gateway."}],"resultDescription":"The raw upstream response from Alchemy's Base Sepolia API is passed through as-is, including the original content type. Typical responses are JSON-RPC result objects containing blockchain data such as block numbers, transaction receipts, account balances, or contract call results.","failureModes":["Payment failure: insufficient USDC balance causes x402 402 Payment Required error","Invalid path: unrecognized Alchemy API path returns upstream 404 or error","Malformed JSON body: upstream returns RPC error for invalid method or params","Network unavailability: Alchemy Base Sepolia endpoint down, returns 502 or timeout","Rate limiting: upstream Alchemy rate limit hit, returns 429 passed through"],"whenToPreferThis":"Choose this endpoint when you need pay-per-use access to Alchemy's Base Sepolia RPC without managing an Alchemy API key or subscription — ideal for agents making infrequent or variable-volume testnet calls where a flat $0.01 USDC per-call cost is preferable to a monthly plan. Best suited for Base Sepolia testnet use cases (development, testing, DeFi prototyping) rather than mainnet production workloads.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-10-10T18:46:01.294Z","isFirstParty":false,"canonicalSlug":"quantaflow-x402-api-gateway-alchemy-base-sepolia-11cd0df8"}