{"id":"ba9cb794-1649-4862-ac57-93db48fce2fc","shortId":"UgTq5q","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 at `/api/v1/payments/331` 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. No API keys or rate limits are required; callers simply attach an X-PAYMENT header with a valid x402 payment proof.\n\nThe broader platform advertises multiple API categories including 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 listed at the same $0.02 per request price point.\n\nHowever, documentation is extremely sparse. The docs, API, pricing, and README pages all render only a \"Connect wallet\" prompt with no further technical detail. There is no OpenAPI schema, no request/response examples, and no description of what the `/api/v1/payments/331` endpoint specifically returns. The endpoint is live and responds with a well-formed x402 challenge, but without documentation it is unclear what data or functionality this particular route provides.","tags":[],"capabilities":["x402-payment","usdc-base-network","pay-per-request","no-api-key","no-rate-limit","json-response"],"categories":["api-platform","payments"],"synonyms":["low payment fee","x402 api","pay per call api","usdc api","base network api","micropayment api","402 payment api"],"warnings":["No documentation available — all doc/pricing/API/README pages render only 'Connect wallet'","No OpenAPI or schema describing request parameters or response format","It is unclear what data or functionality /api/v1/payments/331 specifically provides","The platform lists many endpoint categories but none have documented schemas or examples"],"endpointUrl":"https://lowpaymentfee.com/api/v1/payments/331","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/331","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, but documentation is effectively nonexistent — all doc pages show only 'Connect wallet'. There is no OpenAPI schema, no request/response examples, and no explanation of what this specific endpoint returns. The listing is essentially a stub with confirmed 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'/request':13,28 '0.02':12,27,78,152 '000':73 '20':72 '402':67 '402 payment api' 'accept':46 'access':63 'advertis':107 'ai':119 'analysi':123 'analyt':113 'api':5,20,38,62,83,109,164 'attach':92 'base':8,23,51,74 'base network api' 'broader':105 'call':4,19,81 'caller':90 'categori':110 'challeng':68,211 'classif':126 'connect':173 'convers':143 'data':112,116,219 'descript':191 'detail':180 'doc':163 'document':158,214 'embed':127 'endpoint':55,146,196,200 'estim':137 'exampl':188 'exchang':132 'export':117 'extrem':160 'feed':131 'financ':128 'form':209 'function':221 'gas':136 'generat':144 'geocod':141 'header':97 'howev':157 'includ':111 'infrastructur':139 'insight':118 'json-response' 'key':84 'learn':121 'limit':87 'list':59,148 'live':202 'low payment fee' 'lowpaymentfee.com':31 'machin':120 'metric':114 'micropayment api' 'multipl':108 'network':9,24,52 'no-api-key' 'no-rate-limit' 'openapi':184 'page':168 'particular':223 'pay':2,17,35 'pay per call api' 'pay-per-cal':1,16 'pay-per-request':34 'payment':48,96,102 'per':3,18,36,80,153 'platform':6,21,39,106 'point':156 'premium':61 'price':130,155,165 'prompt':175 'proof':103 'protocol':44 'provid':225 'quot':135 'rate':86,133 'readm':167 'render':170 'report':115 'request':37,69,154 'request/response':187 'requir':89 'respond':204 'return':65,198 'rout':224 'schema':185 'sentiment':122 'simpli':91 'spars':161 'specif':54,197 'summar':125 'technic':179 'text':124 'token':134 'unclear':217 'unit':75 'usd':79 'usdc':15,30,47,77 'usdc api' 'usdc-base-network' 'use':41 'util':140 'valid':100,142 'via':10,25 'wallet':174 'web3':129 'well':208 'well-form':207 'without':213 'x':95 'x-payment':94 'x402':11,26,43,101,210 'x402 api' 'x402-payment'","prices":[{"id":"ba19c4f9-3da0-4351-a7bb-eff77cb132d7","listingId":"ba9cb794-1649-4862-ac57-93db48fce2fc","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/331","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:50:24.143Z"}],"sources":[{"listingId":"ba9cb794-1649-4862-ac57-93db48fce2fc","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/payments/331","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:50:24.143Z","lastSeenAt":"2026-04-23T23:02:46.092Z"}],"details":{"listingId":"ba9cb794-1649-4862-ac57-93db48fce2fc","quickStartSnippet":"# The endpoint requires an x402 X-PAYMENT header with a valid payment proof.\n# Without a payment library, you can probe the challenge:\ncurl -X POST https://lowpaymentfee.com/api/v1/payments/331\n# Returns 402 with x402 challenge. Use an x402 client SDK to attach payment.","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/payments/331"},{"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 APIs across Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"},{"claim":"Docs, API, pricing, and README pages all show only 'Connect wallet' with no further content","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Accessing premium API data with per-request USDC micropayments on Base","Agent-driven API consumption without pre-registration or API keys","Testing x402 payment protocol integrations against a live endpoint"],"bestFor":["Developers experimenting with x402 payment protocol","Agents that need keyless, pay-as-you-go API access","Users who prefer crypto micropayments over subscription billing"],"notFor":["Users who need detailed API documentation or OpenAPI specs before integrating","Production workloads requiring SLA guarantees or support","Users without a Base network USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:07.15Z"},"updatedAt":"2026-04-23T23:02:46.092Z"}}