{"id":"7822d118-6c2f-4c0d-b67f-27409e54a499","shortId":"fcmwCG","kind":"x402","title":"Pay-per-call premium API access on Base via x402 — $0.02/request in USDC.","tagline":"Pay-per-call premium API access on Base via x402 — $0.02/request in USDC.","description":"lowpaymentfee.com hosts a collection of pay-per-request API endpoints accessible via the x402 payment protocol on the Base network. This specific endpoint (`/api/v1/payments/104`) is labeled \"Premium API Access\" and accepts POST requests. Payment is settled in USDC (contract `0x8335…2913` on Base) at a cost of $0.02 per call (20,000 base units with 6 decimals). No API keys, rate limits, or upfront commitments are required — callers simply attach an `X-PAYMENT` header with a valid x402 payment proof.\n\nThe broader lowpaymentfee.com platform advertises endpoints across four categories: Data & Analytics (metrics, reports, data export, insights), AI & Machine Learning (sentiment analysis, text summarization, classification, embeddings), Finance & Web3 (price feeds, exchange rates, token quotes, gas estimates), and Infrastructure utilities (geocoding, validation, conversion, generation). All listed endpoints share the same $0.02/request pricing. However, the specific functionality behind `/api/v1/payments/104` is not documented beyond the generic \"Premium API Access\" label, so its exact behavior is unclear.\n\nThe x402 challenge is live and well-formed, returning a standard 402 response with version 1 of the protocol. The payment recipient address is `0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3`, and the maximum timeout for payment settlement is 300 seconds. Documentation pages beyond the landing page returned only a \"Connect wallet\" prompt with no additional technical detail.","tags":[],"capabilities":["x402-payment","pay-per-request","usdc-settlement","base-network","http-post","no-api-key","json-response"],"categories":["api-gateway","payments"],"synonyms":["x402 API","pay-per-call API","USDC micropayment API","Base network API","lowpaymentfee","premium API access","crypto-paid endpoint"],"warnings":["The specific functionality of /api/v1/payments/104 is undocumented — 'Premium API Access' is the only description available.","All documentation pages (docs, pricing, README, api) returned only a 'Connect wallet' prompt with no technical content.","No request or response schema is available; callers cannot know what to send or expect back.","The endpoint path '/api/v1/payments/104' does not match any of the named endpoints listed on the landing page, making its purpose unclear."],"endpointUrl":"https://lowpaymentfee.com/api/v1/payments/104","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/payments/104","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The x402 challenge is live and pricing is clear ($0.02 USDC per request on Base). However, there is no documentation of what this endpoint actually returns, no request/response schema, and no examples. The docs, pricing, and README pages all returned only 'Connect wallet' with no content. The exact purpose of '/api/v1/payments/104' is unknown beyond the generic 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'/request':13,28,162 '0.02':12,27,79,161 '000':83 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':211 '0x8335':71 '1':202 '20':82 '2913':72 '300':220 '402':198 '6':87 'Base network API' 'USDC micropayment API' 'accept':62 'access':7,22,42,60,178 'across':119 'addit':236 'address':209 'advertis':117 'ai':129 'analysi':133 'analyt':123 'api':6,21,40,59,90,177 'attach':101 'base':9,24,50,74,84 'base-network' 'behavior':183 'behind':168 'beyond':173,224 'broader':114 'call':4,19,81 'caller':99 'categori':121 'challeng':188 'classif':136 'collect':34 'commit':96 'connect':231 'contract':70 'convers':153 'cost':77 'crypto-paid endpoint' 'data':122,126 'decim':88 'detail':238 'document':172,222 'embed':137 'endpoint':41,54,118,157 'estim':147 'exact':182 'exchang':142 'export':127 'feed':141 'financ':138 'form':194 'four':120 'function':167 'gas':146 'generat':154 'generic':175 'geocod':151 'header':106 'host':32 'howev':164 'http-post' 'infrastructur':149 'insight':128 'json-response' 'key':91 'label':57,179 'land':226 'learn':131 'limit':93 'list':156 'live':190 'lowpaymentfee' 'lowpaymentfee.com':31,115 'machin':130 'maximum':214 'metric':124 'network':51 'no-api-key' 'page':223,227 'pay':2,17,37 'pay-per-cal':1,16 'pay-per-call API' 'pay-per-request':36 'payment':46,65,105,111,207,217 'per':3,18,38,80 'platform':116 'post':63 'premium':5,20,58,176 'premium API access' 'price':140,163 'prompt':233 'proof':112 'protocol':47,205 'quot':145 'rate':92,143 'recipi':208 'report':125 'request':39,64 'requir':98 'respons':199 'return':195,228 'second':221 'sentiment':132 'settl':67 'settlement':218 'share':158 'simpli':100 'specif':53,166 'standard':197 'summar':135 'technic':237 'text':134 'timeout':215 'token':144 'unclear':185 'unit':85 'upfront':95 'usdc':15,30,69 'usdc-settlement' 'util':150 'valid':109,152 'version':201 'via':10,25,43 'wallet':232 'web3':139 'well':193 'well-form':192 'x':104 'x-payment':103 'x402':11,26,45,110,187 'x402 API' 'x402-payment'","prices":[{"id":"d946894c-294b-4c1a-8a0f-62872081954b","listingId":"7822d118-6c2f-4c0d-b67f-27409e54a499","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/payments/104","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:49:25.740Z"}],"sources":[{"listingId":"7822d118-6c2f-4c0d-b67f-27409e54a499","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/payments/104","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:49:25.740Z","lastSeenAt":"2026-04-23T19:01:17.294Z"}],"details":{"listingId":"7822d118-6c2f-4c0d-b67f-27409e54a499","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/payments/104 \\\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 x402 challenge with maxAmountRequired of 20000 in USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/payments/104"},{"claim":"All listed endpoints 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":"USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/payments/104"},{"claim":"Platform offers endpoints in Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Accessing premium API functionality without API key registration","Making one-off paid API calls settled in USDC on Base","Integrating pay-per-request endpoints into agent workflows via x402"],"bestFor":["Developers who want instant API access without signup or API keys","Agents that can settle x402 payments in USDC on Base","Low-volume or sporadic usage where per-call pricing is preferable to subscriptions"],"notFor":["Users who need detailed API documentation or schemas before integrating","High-volume consumers who would benefit from bulk pricing or subscriptions","Callers who cannot settle payments on the Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:09.904Z"},"updatedAt":"2026-04-23T19:01:17.294Z"}}