{"id":"fe63733c-0977-446c-963b-0182ba567188","shortId":"X47uHp","kind":"x402","title":"x402-gated product inventory endpoint on Base, pay-per-request with USDC.","tagline":"x402-gated product inventory endpoint on Base, pay-per-request with USDC.","description":"This endpoint at lowpaymentfee.com provides access to a product inventory resource (product ID 63) via the x402 payment protocol. It accepts POST requests and returns JSON. Payment is settled on the Base network using USDC (contract 0x8335…2913) with a maximum cost of $0.02 per request (20,000 base units at 6 decimals). No API keys or rate limits are required — callers simply attach an X-PAYMENT header with a valid x402 payment proof.\n\nThe hosting provider, lowpaymentfee.com, offers a broader catalog of x402-gated APIs spanning data analytics, AI/ML inference (sentiment analysis, summarization, classification, embeddings), finance/crypto market data, and utility services (geocoding, validation, conversion, generation), all priced at $0.02 per call. However, this specific listing covers only the `/api/v1/products/63/inventory` endpoint. The endpoint is live and returned a proper 402 challenge during probing.\n\nDocumentation is extremely sparse. The crawled docs, API, pricing, and README pages all rendered only a \"Connect wallet\" prompt with no further content. There is no OpenAPI spec, no request/response schema, and no usage examples available. The exact structure of the inventory data returned is unknown.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","product-inventory","pay-per-request","no-api-key","json-response"],"categories":["commerce","data"],"synonyms":["product inventory API","x402 inventory endpoint","USDC pay-per-call","lowpaymentfee inventory","Base network API","product data endpoint","crypto-paid API"],"warnings":["No OpenAPI or schema documentation available — request and response formats are unknown.","All documentation pages (docs, API, pricing, README) render only 'Connect wallet' with no usable content.","The specific data returned by the product inventory endpoint is undocumented; 'Premium API Access' is a generic label.","The endpoint path references a specific product ID (63); generalizability to other products is unclear."],"endpointUrl":"https://lowpaymentfee.com/api/v1/products/63/inventory","protocol":"x402","transport":"http","auth":{"type":"x402","details":[{"asset":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","extra":{"name":"USD Coin","version":"2"},"payTo":"0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3","scheme":"exact","network":"base","mimeType":"application/json","resource":"https://lowpaymentfee.com/api/v1/products/63/inventory","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The endpoint is live and returns a valid x402 402 challenge, confirming it is operational. However, there is no OpenAPI spec, no request/response schema, no documentation beyond a wallet-connect prompt, and no examples. The purpose ('Premium API Access' for product 63 inventory) is vague. This is effectively a stub 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'0.02':72,140 '000':76 '0x8335':65 '20':75 '2913':66 '402':160 '6':80 '63':42 'Base network API' 'USDC pay-per-call' 'accept':49 'access':34 'ai/ml':120 'analysi':123 'analyt':119 'api':83,116,171 'attach':92 'avail':199 'base':8,22,60,77 'base-network' 'broader':110 'call':142 'caller':90 'catalog':111 'challeng':161 'classif':125 'connect':180 'content':186 'contract':64 'convers':135 'cost':70 'cover':147 'crawl':169 'crypto-paid API' 'data':118,129,206 'decim':81 'doc':170 'document':164 'embed':126 'endpoint':6,20,30,151,153 'exact':201 'exampl':198 'extrem':166 'finance/crypto':127 'gate':3,17,115 'generat':136 'geocod':133 'header':97 'host':105 'howev':143 'id':41 'infer':121 'inventori':5,19,38,205 'json':54 'json-response' 'key':84 'limit':87 'list':146 'live':155 'lowpaymentfee inventory' 'lowpaymentfee.com':32,107 'market':128 'maximum':69 'network':61 'no-api-key' 'offer':108 'openapi':190 'page':175 'pay':10,24 'pay-per-request':9,23 'payment':46,55,96,102 'per':11,25,73,141 'post':50 'price':138,172 'probe':163 'product':4,18,37,40 'product data endpoint' 'product inventory API' 'product-inventory' 'prompt':182 'proof':103 'proper':159 'protocol':47 'provid':33,106 'rate':86 'readm':174 'render':177 'request':12,26,51,74 'request/response':193 'requir':89 'resourc':39 'return':53,157,207 'schema':194 'sentiment':122 'servic':132 'settl':57 'simpli':91 'span':117 'spars':167 'spec':191 'specif':145 'structur':202 'summar':124 'unit':78 'unknown':209 'usag':197 'usdc':14,28,63 'usdc-settlement' 'use':62 'util':131 'valid':100,134 'via':43 'wallet':181 'x':95 'x-payment':94 'x402':2,16,45,101,114 'x402 inventory endpoint' 'x402-gated':1,15,113 'x402-payment'","prices":[{"id":"13af9133-07d6-4fb8-9b29-31f04402b00a","listingId":"fe63733c-0977-446c-963b-0182ba567188","amountUsd":null,"unit":"per_call","nativeCurrency":"USD COIN","nativeAmount":"20000","chain":"base","payTo":"0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3","paymentMethod":"x402-usd coin","isPrimary":true,"details":{"scheme":"exact","mime_type":"application/json","accepts_all":[{"asset":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","extra":{"name":"USD Coin","version":"2"},"payTo":"0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3","scheme":"exact","network":"base","mimeType":"application/json","resource":"https://lowpaymentfee.com/api/v1/products/63/inventory","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:36:16.709Z"}],"sources":[{"listingId":"fe63733c-0977-446c-963b-0182ba567188","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/products/63/inventory","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:36:16.709Z","lastSeenAt":"2026-04-22T17:00:59.476Z"}],"details":{"listingId":"fe63733c-0977-446c-963b-0182ba567188","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/products/63/inventory \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402_payment_proof>\"","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"Endpoint returns a 402 challenge with x402Version 1, accepting USDC on Base network with maxAmountRequired of 20000 base units","source_url":"https://lowpaymentfee.com/api/v1/products/63/inventory"},{"claim":"USDC asset contract is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/products/63/inventory"},{"claim":"Provider advertises $0.02 per request, no API keys, no rate limits, instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"Provider offers additional API categories including Data & Analytics, AI & ML, Finance & Web3, and Infrastructure","source_url":"https://lowpaymentfee.com"}],"useCases":["Querying real-time inventory status for a specific product","Integrating inventory checks into automated purchasing workflows","Agent-driven inventory monitoring with per-call micropayments"],"bestFor":["Agents needing on-demand inventory data without subscription commitments","Developers experimenting with x402 payment-gated APIs","Workflows requiring crypto-native pay-per-use data access"],"notFor":["Bulk inventory management across thousands of SKUs (no batch endpoint documented)","Users who need detailed API documentation or guaranteed SLAs before integrating"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:48.333Z"},"updatedAt":"2026-04-22T17:00:59.476Z"}}