{"id":"829240eb-af45-4746-9a04-9ed3bca156c9","shortId":"3qeC8e","kind":"x402","title":"x402-gated product inventory endpoint on Base, paid per-request in USDC.","tagline":"x402-gated product inventory endpoint on Base, paid per-request in USDC.","description":"This endpoint at lowpaymentfee.com provides access to a product inventory resource (product ID 17) behind an x402 paywall. The provider operates a broad catalog of pay-per-call APIs spanning data analytics, AI/ML inference, finance, crypto, and utility services, all settled on the Base network using USDC.\n\nThe specific endpoint `/api/v1/products/17/inventory` is listed as \"Premium API Access\" and accepts POST requests. Payment is handled via the x402 protocol: callers receive a 402 challenge with payment parameters, settle on-chain in USDC on Base, and then gain access to the response. The maximum amount required per call is 20,000 base units of USDC (6 decimals), which equals $0.02 USD. The provider advertises a flat $0.02/request price across all endpoints, no API keys, no rate limits, and instant access.\n\nDocumentation is extremely thin — the docs, API, pricing, 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 examples available. The actual data returned by this inventory endpoint is unknown beyond the stated mime type of `application/json`. Prospective callers should be aware that the endpoint's behavior and response format are not documented.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","product-inventory","per-request-billing","no-api-key"],"categories":["commerce","data"],"synonyms":["product inventory API","x402 paid API","USDC micropayment API","Base network API","pay-per-call inventory","lowpaymentfee"],"warnings":["No API documentation available — docs, pricing, API, and README pages all show only 'Connect wallet'","No OpenAPI or schema definition for request or response payloads","The specific meaning of 'products/17/inventory' is undocumented; actual response structure is unknown","Provider appears to be a demo or early-stage platform with many listed endpoints but no substantive documentation"],"endpointUrl":"https://lowpaymentfee.com/api/v1/products/17/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/17/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 challenge with clear pricing, but there is no documentation, no OpenAPI spec, no request/response schema, and no examples. The docs pages are empty beyond a wallet-connect prompt. The purpose of 'product 17 inventory' is 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'/request':146 '0.02':138,145 '000':129 '17':42 '20':128 '402':101 '6':134 'Base network API' 'USDC micropayment API' 'accept':88 'access':34,86,117,159 'across':148 'actual':197 'advertis':142 'ai/ml':62 'amount':123 'analyt':61 'api':58,85,152,166 'application/json':212 'avail':195 'awar':217 'base':8,22,73,113,130 'base-network' 'behavior':222 'behind':43 'beyond':206 'broad':51 'call':57,126 'caller':98,214 'catalog':52 'chain':109 'challeng':102 'connect':175 'crypto':65 'data':60,198 'decim':135 'detail':182 'doc':165 'document':160,191,228 'endpoint':6,20,30,79,150,203,220 'equal':137 'exampl':194 'extrem':162 'financ':64 'flat':144 'format':225 'gain':116 'gate':3,17 'handl':93 'id':41 'infer':63 'instant':158 'inventori':5,19,38,202 'key':153 'limit':156 'list':82 'lowpaymentfee' 'lowpaymentfee.com':32 'maximum':122 'mime':209 'network':74 'no-api-key' 'on-chain':107 'openapi':186 'oper':49 'page':170 'paid':9,23 'paramet':105 'pay':55 'pay-per-cal':54 'pay-per-call inventory' 'payment':91,104 'paywal':46 'per':11,25,56,125 'per-request':10,24 'per-request-billing' 'post':89 'premium':84 'price':147,167 'product':4,18,37,40 'product inventory API' 'product-inventory' 'prompt':177 'prospect':213 'protocol':97 'provid':33,48,141 'rate':155 'readm':169 'receiv':99 'render':172 'request':12,26,90 'request/response':189 'requir':124 'resourc':39 'respons':120,224 'return':199 'schema':190 'servic':68 'settl':70,106 'span':59 'spec':187 'specif':78 'state':208 'technic':181 'thin':163 'type':210 'unit':131 'unknown':205 'usd':139 'usdc':14,28,76,111,133 'usdc-settlement' 'use':75 'util':67 'via':94 'wallet':176 'x402':2,16,45,96 'x402 paid API' 'x402-gated':1,15 'x402-payment'","prices":[{"id":"5de1151a-ada5-4806-8a3e-2db58ba7adb4","listingId":"829240eb-af45-4746-9a04-9ed3bca156c9","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/17/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":"2026-04-18T18:37:19.100Z"}],"sources":[{"listingId":"829240eb-af45-4746-9a04-9ed3bca156c9","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/products/17/inventory","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:37:19.100Z","lastSeenAt":"2026-04-22T16:30:44.060Z"}],"details":{"listingId":"829240eb-af45-4746-9a04-9ed3bca156c9","quickStartSnippet":"# 1. Send POST to get the 402 challenge\ncurl -X POST https://lowpaymentfee.com/api/v1/products/17/inventory\n# Returns 402 with x402 payment challenge (USDC on Base, $0.02)\n# 2. Settle payment on-chain, then resend with X-PAYMENT header\ncurl -X POST https://lowpaymentfee.com/api/v1/products/17/inventory \\\n  -H \"X-PAYMENT: <signed-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 maxAmountRequired of 20000 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/products/17/inventory"},{"claim":"The provider advertises $0.02/request pricing across all endpoints with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/products/17/inventory"},{"claim":"Docs, pricing, API, and README pages render only a 'Connect wallet' prompt","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Querying product inventory data with per-request USDC micropayments","Integrating pay-per-call inventory checks into automated agent workflows","Accessing premium product data without API key registration"],"bestFor":["Agents or services that can settle x402 payments on Base in USDC","Use cases requiring keyless, per-request API access","Low-volume or sporadic inventory lookups where subscription pricing is wasteful"],"notFor":["Users who need detailed API documentation or response schema guarantees before integrating","High-volume inventory queries where per-request pricing at $0.02 adds up significantly","Users without a Base-compatible USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:45.254Z"},"updatedAt":"2026-04-22T16:30:44.060Z"}}