{"id":"700baefb-f8a4-47da-8f9d-7e381a747e01","shortId":"fPTMPf","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 70) via the x402 payment protocol. It is one of many endpoints offered by the lowpaymentfee.com platform, which hosts a broad catalog of pay-per-call APIs spanning data analytics, AI/ML inference, finance/Web3 data, and infrastructure utilities — all gated behind x402 micropayments on the Base network using USDC.\n\nThe specific endpoint `/api/v1/products/70/inventory` is listed as \"Premium API Access\" and accepts POST requests. Payment is settled on-chain on Base in USDC (contract 0x8335…2913) with a maximum amount of 20,000 base units, which equals $0.02 (USDC uses 6 decimals). The platform advertises flat $0.02/request pricing across all its endpoints, with no API keys, no rate limits, and no minimum commitments required. The x402 challenge was successfully captured (HTTP 402 with version 1 challenge), confirming the endpoint is live.\n\nDocumentation is extremely sparse — the docs, pricing, API, and README pages all render only a \"Connect wallet\" prompt with no further technical detail. There is no OpenAPI spec, no request/response schema documentation, and no example payloads available. The endpoint's actual data content (what inventory data is returned for product 70) is unknown from the available material. The platform appears to be a demonstration or early-stage x402 API marketplace.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","pay-per-request","product-inventory","post-method"],"categories":["commerce","data"],"synonyms":["product inventory API","x402 micropayment API","USDC pay-per-call","lowpaymentfee","Base network API","inventory lookup","402 payment endpoint"],"warnings":["No API documentation available — docs, pricing, API, and README pages all show only 'Connect wallet'","No OpenAPI or request/response schema provided; actual data content of the inventory endpoint is unknown","The endpoint name 'Premium API Access' is generic and does not describe what data is returned","Platform appears to be early-stage or a demo; reliability and data quality are unverifiable"],"endpointUrl":"https://lowpaymentfee.com/api/v1/products/70/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/70/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 (402 challenge captured) and pricing is clear ($0.02 USDC on Base), but there is zero documentation on request/response schemas, no OpenAPI spec, no examples, and the actual data returned is unknown. The docs pages are empty beyond a wallet-connect prompt. This is effectively a stub 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'/request':139 '0.02':129,138 '000':124 '0x8335':116 '1':167 '20':123 '2913':117 '402':164 '402 payment endpoint' '6':132 '70':42,224 'Base network API' 'USDC pay-per-call' 'accept':102 'access':34,100 'across':141 'actual':214 'advertis':136 'ai/ml':73 'amount':121 'analyt':72 'api':69,99,147,181,243 'appear':233 'avail':210,229 'base':8,22,87,112,125 'base-network' 'behind':82 'broad':62 'call':68 'captur':162 'catalog':63 'chain':110 'challeng':159,168 'commit':155 'confirm':169 'connect':189 'content':216 'contract':115 'data':71,76,215,219 'decim':133 'demonstr':237 'detail':196 'doc':179 'document':174,205 'earli':240 'early-stag':239 'endpoint':6,20,30,53,93,144,171,212 'equal':128 'exampl':208 'extrem':176 'finance/web3':75 'flat':137 'gate':3,17,81 'host':60 'http':163 'id':41 'infer':74 'infrastructur':78 'inventori':5,19,38,218 'inventory lookup' 'key':148 'limit':151 'list':96 'live':173 'lowpaymentfee' 'lowpaymentfee.com':32,57 'mani':52 'marketplac':244 'materi':230 'maximum':120 'micropay':84 'minimum':154 'network':88 'offer':54 'on-chain':108 'one':50 'openapi':200 'page':184 'pay':10,24,66 'pay-per-cal':65 'pay-per-request':9,23 'payload':209 'payment':46,105 'per':11,25,67 'platform':58,135,232 'post':103 'post-method' 'premium':98 'price':140,180 'product':4,18,37,40,223 'product inventory API' 'product-inventory' 'prompt':191 'protocol':47 'provid':33 'rate':150 'readm':183 'render':186 'request':12,26,104 'request/response':203 'requir':156 'resourc':39 'return':221 'schema':204 'settl':107 'span':70 'spars':177 'spec':201 'specif':92 'stage':241 'success':161 'technic':195 'unit':126 'unknown':226 'usdc':14,28,90,114,130 'usdc-settlement' 'use':89,131 'util':79 'version':166 'via':43 'wallet':190 'x402':2,16,45,83,158,242 'x402 micropayment API' 'x402-gated':1,15 'x402-payment'","prices":[{"id":"6bbb5b84-7c50-474d-aec8-22baec4034fe","listingId":"700baefb-f8a4-47da-8f9d-7e381a747e01","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/70/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":"2026-04-18T18:35:08.466Z"}],"sources":[{"listingId":"700baefb-f8a4-47da-8f9d-7e381a747e01","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/products/70/inventory","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:35:08.466Z","lastSeenAt":"2026-04-22T19:30:36.168Z"}],"details":{"listingId":"700baefb-f8a4-47da-8f9d-7e381a747e01","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/products/70/inventory \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-token>\"","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"The endpoint returns a 402 challenge with x402Version 1, confirming it is live","source_url":"https://lowpaymentfee.com/api/v1/products/70/inventory"},{"claim":"Payment is in USDC on Base network with maxAmountRequired of 20000 base units ($0.02)","source_url":"https://lowpaymentfee.com/api/v1/products/70/inventory"},{"claim":"Platform advertises $0.02/request flat pricing with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"Docs, pricing, API, and README pages render only a 'Connect wallet' prompt","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Querying product inventory data for product ID 70 via a single paid API call","Demonstrating x402 protocol integration for agent-to-API micropayments","Building automated purchasing or inventory-checking workflows that settle in USDC on Base"],"bestFor":["Developers experimenting with x402 payment protocol integration","Agents needing pay-per-call inventory data without API key management","Projects requiring on-chain USDC micropayment settlement on Base"],"notFor":["Production inventory management systems (no documentation on data schema or reliability)","Users who need detailed API documentation or OpenAPI specs before integrating","High-volume use cases where $0.02/request adds up without bulk discounts"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:51.592Z"},"updatedAt":"2026-04-22T19:30:36.168Z"}}