{"id":"1fa41cd3-ce2c-465c-8eaf-0915b5630177","shortId":"ppuCXH","kind":"x402","title":"Pay-per-call API platform on Base (USDC) via x402 — $0.02/request, no API keys required.","tagline":"Pay-per-call API platform on Base (USDC) via x402 — $0.02/request, no API keys required.","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/customers/93` is listed as \"Premium API Access\" and returns JSON. The x402 challenge indicates a maximum cost of 20,000 base units of USDC (0.02 USD per call) settled to address 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3.\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/request price point. The platform emphasizes no API keys, no rate limits, and instant access.\n\nHowever, the specific `/api/v1/customers/93` endpoint's purpose is unclear — it does not map to any of the documented API categories on the landing page. There is no OpenAPI schema, no detailed documentation (docs, pricing, and README pages all render only a \"Connect wallet\" prompt), and no request/response examples are available. The endpoint is confirmed live via a valid 402 challenge, but what data it actually returns when paid is unknown.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","json-response","no-api-key","http-post"],"categories":["data","api-platform"],"synonyms":["low payment fee","x402 api","pay per call api","usdc api","base network api","micropayment api","402 payment api"],"warnings":["No OpenAPI or schema documentation available — docs/pricing/README pages all render only 'Connect wallet'","The endpoint path /api/v1/customers/93 does not correspond to any documented API category on the landing page","No request body schema or response examples are available; actual behavior when paid is unknown","Platform appears to be a demonstration or early-stage project with minimal documentation"],"endpointUrl":"https://lowpaymentfee.com/api/v1/customers/93","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/customers/93","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The endpoint is live and returns a valid x402 402 challenge with clear pricing ($0.02 USDC on Base). However, there is no OpenAPI schema, no documentation beyond a landing page, no request/response examples, and the specific /api/v1/customers/93 endpoint's purpose is not explained anywhere in the crawled material. Effectively a stub 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'/request':13,30,141 '0.02':12,29,84,140 '000':79 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':91 '20':78 '402':214 '402 payment api' 'accept':50 'access':66,155 'actual':220 'address':90 'advertis':95 'ai':107 'analysi':111 'analyt':101 'api':5,15,22,32,42,65,97,148,174 'avail':205 'base':8,25,55,80 'base network api' 'broader':93 'call':4,21,87 'categori':98,175 'challeng':72,215 'classif':114 'confirm':209 'connect':197 'convers':131 'cost':76 'data':100,104,218 'detail':186 'doc':188 'document':173,187 'embed':115 'emphas':146 'endpoint':59,134,160,207 'estim':125 'exampl':203 'exchang':120 'export':105 'feed':119 'financ':116 'gas':124 'generat':132 'geocod':129 'howev':156 'http-post' 'includ':99 'indic':73 'infrastructur':127 'insight':106 'instant':154 'json':69 'json-response' 'key':16,33,149 'land':178 'learn':109 'limit':152 'list':62,136 'live':210 'low payment fee' 'lowpaymentfee.com':35 'machin':108 'map':168 'maximum':75 'metric':102 'micropayment api' 'multipl':96 'network':56 'no-api-key' 'openapi':183 'page':179,192 'paid':223 'pay':2,19,39 'pay per call api' 'pay-per-cal':1,18 'pay-per-request':38 'payment':52 'per':3,20,40,86 'platform':6,23,43,94,145 'point':143 'premium':64 'price':118,142,189 'prompt':199 'protocol':48 'purpos':162 'quot':123 'rate':121,151 'readm':191 'render':194 'report':103 'request':41 'request/response':202 'requir':17,34 'return':68,221 'schema':184 'sentiment':110 'settl':88 'specif':58,158 'summar':113 'text':112 'token':122 'unclear':164 'unit':81 'unknown':225 'usd':85 'usdc':9,26,51,83 'usdc api' 'usdc-base' 'use':45 'util':128 'valid':130,213 'via':10,27,211 'wallet':198 'web3':117 'x402':11,28,47,71 'x402 api' 'x402-payment'","prices":[{"id":"e7f50c53-d6b1-40e6-aa56-857bb9ac30eb","listingId":"1fa41cd3-ce2c-465c-8eaf-0915b5630177","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/customers/93","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:36:42.690Z"}],"sources":[{"listingId":"1fa41cd3-ce2c-465c-8eaf-0915b5630177","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/customers/93","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:36:42.690Z","lastSeenAt":"2026-04-25T01:32:01.699Z"}],"details":{"listingId":"1fa41cd3-ce2c-465c-8eaf-0915b5630177","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/customers/93 \\\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 x402 challenge returns maxAmountRequired of 20000 base units of USDC (USD Coin) on Base network","source_url":"https://lowpaymentfee.com/api/v1/customers/93"},{"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":"Platform offers APIs across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/customers/93"}],"useCases":["Accessing premium data via a single USDC micropayment without needing an API key","Agent-driven workflows that need low-friction, per-call API access on Base","Testing x402 protocol integrations with a low-cost endpoint"],"bestFor":["Developers experimenting with x402 payment protocol","Agents needing keyless, pay-per-use API access","Low-cost micropayment API consumption on Base network"],"notFor":["Users who need detailed API documentation or schemas before integrating","High-volume use cases where per-request pricing may add up without bulk discounts","Anyone requiring non-USDC or non-Base payment options"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:46.989Z"},"updatedAt":"2026-04-25T01:32:01.699Z"}}