{"id":"7f9ec323-2c7a-4c35-87e2-1fe69b2807df","shortId":"JYSQ3A","kind":"x402","title":"Pay-per-call product inventory endpoint on Base via x402, settled in USDC at $0.02/request.","tagline":"Pay-per-call product inventory endpoint on Base via x402, settled in USDC at $0.02/request.","description":"This x402-enabled endpoint at lowpaymentfee.com provides access to product inventory data (specifically for product ID 100) via a POST request. Payment is handled inline using the x402 protocol on the Base network, settling in USDC (contract 0x8335…2913). Each call costs a maximum of 0.02 USDC (20,000 base units with 6 decimals), with no API keys, rate limits, or upfront commitments required.\n\nThe endpoint is part of a broader suite of pay-per-call APIs offered by lowpaymentfee.com spanning data & analytics, AI/ML inference, finance & Web3 data, and infrastructure utilities — all priced uniformly at $0.02 per request. The specific endpoint enriched here targets inventory lookup, though the provider's landing page does not list this particular path among its featured APIs, suggesting it may be a demo or ancillary resource.\n\nDocumentation is extremely sparse. The /docs, /pricing, /api, and /README pages all resolve to a minimal \"Connect wallet\" prompt with no further content. There is no OpenAPI spec, no request/response schema documentation, and no usage examples beyond the x402 challenge itself. The endpoint is confirmed live (returns a proper 402 challenge), but without documentation it is difficult to know what request body to send or what shape the response takes.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","product-inventory","pay-per-call","no-api-key","post-endpoint"],"categories":["commerce","data"],"synonyms":["product inventory API","x402 inventory","pay-per-request API","USDC micropayment API","Base network API","lowpaymentfee","inventory lookup","402 payment endpoint"],"warnings":["No documentation available — /docs, /pricing, /api, and /README all show only a wallet-connect prompt","No OpenAPI or request/response schema provided; request body and response format are unknown","This specific endpoint (/api/v1/products/100/inventory) is not listed among the provider's advertised APIs","Provider appears to be a demo or early-stage project with minimal content"],"endpointUrl":"https://lowpaymentfee.com/api/v1/products/100/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/100/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 documentation is essentially nonexistent — no OpenAPI spec, no request/response schemas, no examples. The specific inventory endpoint is not even listed on the provider's own landing page. This is effectively a stub 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'/docs':173 '/pricing':174 '/readme':177 '/request':17,34 '0.02':16,33,81,132 '000':84 '0x8335':73 '100':52 '20':83 '2913':74 '402':217 '402 payment endpoint' '6':88 'Base network API' 'USDC micropayment API' 'access':43 'ai/ml':120 'among':155 'analyt':119 'ancillari':166 'api':92,113,158 'base':9,26,67,85 'base-network' 'beyond':204 'bodi':229 'broader':106 'call':4,21,76,112 'challeng':207,218 'commit':98 'confirm':212 'connect':184 'content':190 'contract':72 'cost':77 'data':47,118,124 'decim':89 'demo':164 'difficult':224 'document':168,199,221 'enabl':38 'endpoint':7,24,39,101,137,210 'enrich':138 'exampl':203 'extrem':170 'featur':157 'financ':122 'handl':59 'id':51 'infer':121 'infrastructur':126 'inlin':60 'inventori':6,23,46,141 'inventory lookup' 'key':93 'know':226 'land':147 'limit':95 'list':151 'live':213 'lookup':142 'lowpaymentfee' 'lowpaymentfee.com':41,116 'maximum':79 'may':161 'minim':183 'network':68 'no-api-key' 'offer':114 'openapi':194 'page':148,178 'part':103 'particular':153 'path':154 'pay':2,19,110 'pay-per-cal':1,18,109 'pay-per-call' 'pay-per-request API' 'payment':57 'per':3,20,111,133 'post':55 'post-endpoint' 'price':129 'product':5,22,45,50 'product inventory API' 'product-inventory' 'prompt':186 'proper':216 'protocol':64 'provid':42,145 'rate':94 'request':56,134,228 'request/response':197 'requir':99 'resolv':180 'resourc':167 'respons':236 'return':214 'schema':198 'send':231 'settl':12,29,69 'shape':234 'span':117 'spars':171 'spec':195 'specif':48,136 'suggest':159 'suit':107 'take':237 'target':140 'though':143 'uniform':130 'unit':86 'upfront':97 'usag':202 'usdc':14,31,71,82 'usdc-settlement' 'use':61 'util':127 'via':10,27,53 'wallet':185 'web3':123 'without':220 'x402':11,28,37,63,206 'x402 inventory' 'x402-enabled':36 'x402-payment'","prices":[{"id":"0d86bd4d-a815-494b-b9a4-c53be59a70ad","listingId":"7f9ec323-2c7a-4c35-87e2-1fe69b2807df","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/100/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":"2026-04-18T18:32:23.143Z"}],"sources":[{"listingId":"7f9ec323-2c7a-4c35-87e2-1fe69b2807df","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/products/100/inventory","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:32:23.143Z","lastSeenAt":"2026-04-22T21:30:18.119Z"}],"details":{"listingId":"7f9ec323-2c7a-4c35-87e2-1fe69b2807df","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/products/100/inventory \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-header>\" \\\n  -d '{}'","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 in USDC on Base network","source_url":"https://lowpaymentfee.com/api/v1/products/100/inventory"},{"claim":"All APIs are priced at $0.02 per request with no API keys, no rate limits, and instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"The USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/products/100/inventory"}],"useCases":["Querying product inventory levels with per-call USDC micropayments","Integrating inventory checks into agent workflows without API key management","Demonstrating x402 protocol payment flows on Base"],"bestFor":["Developers experimenting with x402 pay-per-call patterns","Agents needing keyless, on-demand inventory data access","Projects already operating on the Base L2 with USDC"],"notFor":["Production inventory management requiring documented schemas and SLAs","High-volume bulk inventory queries where per-call pricing is inefficient","Users without Base network USDC wallets"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:59.818Z"},"updatedAt":"2026-04-22T21:30:18.119Z"}}