{"id":"a28983b2-5d28-409a-8de6-9dbd4cfd7d04","shortId":"NefEk4","kind":"x402","title":"x402-gated product inventory endpoint on Base, pay-per-call with USDC.","tagline":"x402-gated product inventory endpoint on Base, pay-per-call with USDC.","description":"This endpoint at lowpaymentfee.com provides access to a product inventory resource (product ID 34) 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-request APIs spanning data analytics, AI/ML inference, finance, crypto, and utility services. All endpoints on the platform use the x402 protocol to gate access, settling payments in USDC on the Base network.\n\nThe specific endpoint `/api/v1/products/34/inventory` accepts POST requests and returns JSON. The x402 challenge indicates a maximum cost of 20,000 base units of USDC (0.02 USD per request, since USDC uses 6 decimals). The payment is sent to address `0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3` on Base, with a timeout of 300 seconds. No API keys or rate limits are advertised; access is granted purely via the x402 payment header.\n\nDocumentation on the site is extremely sparse — the docs, API, pricing, and README pages all render only a \"Connect wallet\" prompt with no further content. There is no OpenAPI schema, no request/response examples, and no description of what the inventory data actually contains or what fields the POST body expects. The endpoint is confirmed live (returns 402 with a valid x402 challenge), but the lack of documentation makes it difficult to use without experimentation.","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","pay-per-call inventory","USDC gated API","lowpaymentfee inventory","Base network API","micropayment API"],"warnings":["No documentation available — docs, API, pricing, and README pages all show only 'Connect wallet' with no content","No OpenAPI or request/response schema provided; request body format and response structure are unknown","The specific purpose and data returned by the /products/34/inventory endpoint is undocumented","The broader lowpaymentfee.com platform lists many endpoints but provides no detailed docs for any of them"],"endpointUrl":"https://lowpaymentfee.com/api/v1/products/34/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/34/inventory","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The endpoint is confirmed live with a valid x402 challenge, but documentation is essentially nonexistent — no OpenAPI spec, no request/response examples, no description of what inventory data is returned or what POST body is expected. The listing is effectively a 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'0.02':124 '000':119 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':139 '20':118 '300':146 '34':42 '402':221 '6':131 'Base network API' 'USDC gated API' 'accept':104 'access':34,91,156 'actual':206 'address':138 'advertis':155 'ai/ml':73 'analyt':72 'api':69,149,174 'base':8,22,98,120,141 'base-network' 'bodi':213 'broad':62 'call':12,26 'catalog':63 'challeng':112,226 'confirm':218 'connect':183 'contain':207 'content':189 'cost':116 'crypto':76 'data':71,205 'decim':132 'descript':200 'difficult':234 'doc':173 'document':165,231 'endpoint':6,20,30,53,81,102,216 'exampl':197 'expect':214 'experiment':238 'extrem':170 'field':210 'financ':75 'gate':3,17,90 'grant':158 'header':164 'host':60 'id':41 'indic':113 'infer':74 'inventori':5,19,38,204 'json':109 'json-response' 'key':150 'lack':229 'limit':153 'live':219 'lowpaymentfee inventory' 'lowpaymentfee.com':32,57 'make':232 'mani':52 'maximum':115 'micropayment API' 'network':99 'no-api-key' 'offer':54 'one':50 'openapi':193 'page':178 'pay':10,24,66 'pay-per-cal':9,23 'pay-per-call inventory' 'pay-per-request':65 'payment':46,93,134,163 'per':11,25,67,126 'platform':58,84 'post':105,212 'price':175 'product':4,18,37,40 'product inventory API' 'product-inventory' 'prompt':185 'protocol':47,88 'provid':33 'pure':159 'rate':152 'readm':177 'render':180 'request':68,106,127 'request/response':196 'resourc':39 'return':108,220 'schema':194 'second':147 'sent':136 'servic':79 'settl':92 'sinc':128 'site':168 'span':70 'spars':171 'specif':101 'timeout':144 'unit':121 'usd':125 'usdc':14,28,95,123,129 'usdc-settlement' 'use':85,130,236 'util':78 'valid':224 'via':43,160 'wallet':184 'without':237 'x402':2,16,45,87,111,162,225 'x402 inventory endpoint' 'x402-gated':1,15 'x402-payment'","prices":[{"id":"9c4ccde7-91b1-4723-ad60-e14921560b94","listingId":"a28983b2-5d28-409a-8de6-9dbd4cfd7d04","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/34/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":"2026-04-18T18:37:31.215Z"}],"sources":[{"listingId":"a28983b2-5d28-409a-8de6-9dbd4cfd7d04","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/products/34/inventory","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:37:31.215Z","lastSeenAt":"2026-04-22T16:30:44.980Z"}],"details":{"listingId":"a28983b2-5d28-409a-8de6-9dbd4cfd7d04","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/products/34/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 x402 challenge with maxAmountRequired of 20000 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/products/34/inventory"},{"claim":"The platform advertises $0.02 per request pricing with no API keys, no rate limits, and instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/products/34/inventory"},{"claim":"Docs, API, pricing, and README pages render only 'Connect wallet' with no further content","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Querying product inventory data for product ID 34 on a per-request payment basis","Integrating pay-per-call inventory checks into automated agent workflows","Accessing inventory information without needing API key registration"],"bestFor":["Agents or services that need on-demand inventory lookups with crypto micropayments","Developers experimenting with x402 protocol integrations","Use cases where avoiding API key management is desirable"],"notFor":["Production systems requiring well-documented request/response schemas","High-volume inventory queries where per-request pricing may add up","Users who cannot transact in USDC on the Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:44.722Z"},"updatedAt":"2026-04-22T16:30:44.980Z"}}