{"uid":"cap_2aXEhyXL5QfrdFEb0DEPX","slug":"quantaflow-x402-api-gateway-alchemy-stable-mainnet-16fd9edc","name":"QuantaFlow x402 API Gateway — Alchemy Stable Mainnet","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-stable-mainnet?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_Yfeejf7H2Apm9RLXg9rQc","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 POST requests to the Alchemy stable mainnet endpoint via the x402 micropayment protocol, charging $0.01 USDC per call.","exampleAgentPrompt":"Forward a request to the Alchemy stable mainnet at path /v2/eth_blockNumber with no body — use the QuantaFlow x402 gateway so it automatically handles the $0.01 USDC payment.","exampleUseCases":[{"title":"Live Ethereum block height lookup","prompt":"Query the current Ethereum mainnet block number by sending a JSON-RPC eth_blockNumber request through the QuantaFlow Alchemy gateway — pay the micro-fee per call."},{"title":"DeFi token balance check","prompt":"Call the Alchemy stable mainnet via QuantaFlow to get the USDC token balance for wallet address 0xABC...123 on Ethereum mainnet — path /v2/eth_call with the appropriate JSON body."},{"title":"On-chain transaction status fetch","prompt":"Look up the status of Ethereum transaction 0xDEF...789 on mainnet using the QuantaFlow Alchemy gateway at path /v2/eth_getTransactionReceipt, and pay the $0.01 per-call fee automatically."}],"resultDescription":"The raw response body and content type returned by the Alchemy stable mainnet upstream are passed through unchanged after successful x402 payment verification. Typically a JSON-RPC result containing blockchain data such as block numbers, balances, or transaction receipts.","failureModes":["Payment failure — insufficient USDC balance or invalid x402 payment header returns 402 Payment Required","Invalid path — unrecognized or malformed upstream path returns an error from Alchemy or the gateway","Alchemy upstream error — Alchemy may return RPC errors (e.g. invalid params, method not found) passed through as-is","Rate limiting — Alchemy upstream quota exceeded","Network timeout — upstream Alchemy node takes too long to respond"],"whenToPreferThis":"Choose this endpoint when you need pay-as-you-go access to Alchemy's stable Ethereum mainnet API without committing to a monthly subscription, especially in agent workflows where call volume is unpredictable. It is ideal for web3 agents using the x402 micropayment protocol to autonomously authorize per-call USDC fees. Prefer it over a direct Alchemy subscription for low-volume or bursty on-chain queries.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-10-23T00:39:41.707Z","isFirstParty":false,"canonicalSlug":"quantaflow-x402-api-gateway-alchemy-stable-mainnet-16fd9edc"}