{"id":"6929781f-2996-46bf-bb5a-d212566b1945","shortId":"RP2T8N","kind":"x402","title":"Pay-per-call API platform on Base network via x402 — $0.02/request in USDC.","tagline":"Pay-per-call API platform on Base network via x402 — $0.02/request in USDC.","description":"lowpaymentfee.com is a pay-per-request API platform that uses the x402 protocol to accept USDC payments on the Base network. The specific endpoint `/api/v1/charges/90` is listed as \"Premium API Access\" and returns a 402 challenge requesting up to 20,000 base units of USDC (0.02 USD) per call. The platform advertises no API keys, no rate limits, and instant access — you simply attach an X-PAYMENT header with a valid x402 payment to use any endpoint.\n\nThe broader platform offers 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 endpoints are priced at $0.02 per request.\n\nHowever, the specific functionality behind `/api/v1/charges/90` (\"Premium API Access\") is not documented beyond its name. The docs, pricing, and README pages all render only a \"Connect wallet\" prompt with no additional technical documentation, schemas, or example payloads. Without paying for a request, it is unclear what data this particular endpoint returns or what input it expects beyond a POST request with a JSON content type. The platform is live and the x402 challenge is well-formed, but the lack of documentation is a significant gap.","tags":[],"capabilities":["x402-payment","usdc-base-network","pay-per-request","no-api-key","json-response","post-method"],"categories":["api-platform","payments"],"synonyms":["low payment fee","x402 api","pay per call api","usdc api access","base network api","micropayment api","402 payment api"],"warnings":["No documentation available — docs, pricing, and README pages only show 'Connect wallet'","The specific functionality of /api/v1/charges/90 ('Premium API Access') is completely undocumented","No request or response schema is provided; input/output format is unknown","No OpenAPI specification or API reference found"],"endpointUrl":"https://lowpaymentfee.com/api/v1/charges/90","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/charges/90","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 402 challenge, but there is essentially no documentation: no OpenAPI spec, no request/response schemas, no examples, and no explanation of what 'Premium API Access' actually returns. The docs pages are empty beyond a wallet-connect prompt. The listing is effectively a 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'/request':13,28 '0.02':12,27,77,156 '000':72 '20':71 '402':66 '402 payment api' 'accept':46 'access':62,92,167 'across':115 'addit':189 'advertis':83 'ai':125 'analysi':129 'analyt':119 'api':5,20,38,61,85,166 'attach':95 'base':8,23,51,73 'base network api' 'behind':163 'beyond':171,215 'broader':111 'call':4,19,80 'categori':117 'challeng':67,231 'classif':132 'connect':184 'content':222 'convers':149 'data':118,122,205 'doc':175 'document':170,191,240 'embed':133 'endpoint':55,109,114,152,208 'estim':143 'exampl':194 'exchang':138 'expect':214 'export':123 'feed':137 'financ':134 'form':235 'four':116 'function':162 'gap':244 'gas':142 'generat':150 'geocod':147 'header':100 'howev':159 'infrastructur':145 'input':212 'insight':124 'instant':91 'json':221 'json-response' 'key':86 'lack':238 'learn':127 'limit':89 'list':58 'live':227 'low payment fee' 'lowpaymentfee.com':31 'machin':126 'metric':120 'micropayment api' 'name':173 'network':9,24,52 'no-api-key' 'offer':113 'page':179 'particular':207 'pay':2,17,35,197 'pay per call api' 'pay-per-cal':1,16 'pay-per-request':34 'payload':195 'payment':48,99,105 'per':3,18,36,79,157 'platform':6,21,39,82,112,225 'post':217 'post-method' 'premium':60,165 'price':136,154,176 'prompt':186 'protocol':44 'quot':141 'rate':88,139 'readm':178 'render':181 'report':121 'request':37,68,158,200,218 'return':64,209 'schema':192 'sentiment':128 'signific':243 'simpli':94 'specif':54,161 'summar':131 'technic':190 'text':130 'token':140 'type':223 'unclear':203 'unit':74 'usd':78 'usdc':15,30,47,76 'usdc api access' 'usdc-base-network' 'use':41,107 'util':146 'valid':103,148 'via':10,25 'wallet':185 'web3':135 'well':234 'well-form':233 'without':196 'x':98 'x-payment':97 'x402':11,26,43,104,230 'x402 api' 'x402-payment'","prices":[{"id":"b81e9645-5996-4536-8139-263cab8a9151","listingId":"6929781f-2996-46bf-bb5a-d212566b1945","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/charges/90","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:45:31.398Z"}],"sources":[{"listingId":"6929781f-2996-46bf-bb5a-d212566b1945","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/charges/90","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:45:31.398Z","lastSeenAt":"2026-04-24T10:32:38.077Z"}],"details":{"listingId":"6929781f-2996-46bf-bb5a-d212566b1945","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/charges/90 \\\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 requesting up to 20,000 base units of USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base network","source_url":"https://lowpaymentfee.com/api/v1/charges/90"},{"claim":"All endpoints are priced at $0.02 per request with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"The platform offers endpoints in Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"},{"claim":"Docs, pricing, and README pages render only a 'Connect wallet' prompt","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Programmatic access to premium API data without subscription or API key management","Agent-driven workflows that need on-demand API calls settled in USDC on Base","Testing x402 payment protocol integrations with a low-cost endpoint"],"bestFor":["Developers exploring x402 pay-per-call patterns","AI agents needing keyless, instant API access","Low-volume or sporadic API consumers who want no commitments"],"notFor":["Users who need detailed API documentation or schemas before purchasing","High-volume consumers who would benefit from bulk pricing or subscriptions","Anyone without a Base-network USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:21.306Z"},"updatedAt":"2026-04-24T10:32:38.077Z"}}