{"id":"ddf48376-e2ac-496e-b8a7-25c36d87d279","shortId":"TU9un9","kind":"x402","title":"Pay-per-call API platform on Base via x402 — $0.02/request for data, AI, finance, and utility endpoints.","tagline":"Pay-per-call API platform on Base via x402 — $0.02/request for data, AI, finance, and utility endpoints.","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/350` is labeled \"Premium API Access\" and costs $0.02 per call (20,000 base units of USDC with 6 decimals). No API keys, rate limits, or upfront commitments are required — each request is paid for individually via an X-PAYMENT header containing a signed x402 payment.\n\nThe broader platform advertises multiple API 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.\n\nDocumentation is extremely sparse. The docs, API reference, pricing, and README pages all render only a \"Connect wallet\" prompt with no substantive content. There is no OpenAPI schema, no request/response examples, and no description of what the `/api/v1/payments/350` endpoint specifically returns. The x402 challenge confirms the endpoint is live and accepts POST requests, but the actual functionality behind this particular path is unclear.","tags":[],"capabilities":["x402-payment","usdc-base-network","pay-per-request","no-api-key","post-method","json-response"],"categories":["api-platform","payments"],"synonyms":["low payment fee","x402 api","pay per call api","usdc api","base network api","micropayment api","lowpaymentfee"],"warnings":["No documentation available — docs, API, pricing, and README pages all show only 'Connect wallet'","No OpenAPI or schema describing request parameters or response format","The specific functionality of /api/v1/payments/350 ('Premium API Access') is undocumented and unclear","No request or response examples available anywhere in crawled content"],"endpointUrl":"https://lowpaymentfee.com/api/v1/payments/350","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/350","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.250","qualityRationale":"The x402 challenge confirms the endpoint is live and pricing is clear ($0.02 USDC on Base), but there is no documentation, no OpenAPI schema, no request/response examples, and no explanation of what this specific endpoint actually does. The docs pages are empty beyond a wallet-connect prompt. This is effectively a stub 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'/request':12,31,159 '0.02':11,30,73,158 '000':77 '20':76 '6':83 'accept':54,211 'access':70 'actual':216 'advertis':115 'ai':15,34,126 'analysi':130 'analyt':120 'api':5,24,46,69,86,117,167 'base':8,27,59,78 'base network api' 'behind':218 'broader':113 'call':4,23,75 'categori':118 'challeng':204 'classif':133 'commit':92 'confirm':205 'connect':177 'contain':107 'content':183 'convers':150 'cost':72 'data':14,33,119,123 'decim':84 'descript':194 'doc':166 'document':161 'embed':134 'endpoint':19,38,63,154,199,207 'estim':144 'exampl':191 'exchang':139 'export':124 'extrem':163 'feed':138 'financ':16,35,135 'function':217 'gas':143 'generat':151 'geocod':148 'header':106 'individu':100 'infrastructur':146 'insight':125 'json-response' 'key':87 'label':67 'learn':128 'limit':89 'list':153 'live':209 'low payment fee' 'lowpaymentfee' 'lowpaymentfee.com':39 'machin':127 'metric':121 'micropayment api' 'multipl':116 'network':60 'no-api-key' 'openapi':187 'page':172 'paid':98 'particular':220 'path':221 'pay':2,21,43 'pay per call api' 'pay-per-cal':1,20 'pay-per-request':42 'payment':56,105,111 'per':3,22,44,74 'platform':6,25,47,114 'post':212 'post-method' 'premium':68 'price':137,160,169 'prompt':179 'protocol':52 'quot':142 'rate':88,140 'readm':171 'refer':168 'render':174 'report':122 'request':45,96,213 'request/response':190 'requir':94 'return':201 'schema':188 'sentiment':129 'share':155 'sign':109 'spars':164 'specif':62,200 'substant':182 'summar':132 'text':131 'token':141 'unclear':223 'unit':79 'upfront':91 'usdc':55,81 'usdc api' 'usdc-base-network' 'use':49 'util':18,37,147 'valid':149 'via':9,28,101 'wallet':178 'web3':136 'x':104 'x-payment':103 'x402':10,29,51,110,203 'x402 api' 'x402-payment'","prices":[{"id":"873ba164-1d29-427f-b733-1cc73398f7b3","listingId":"ddf48376-e2ac-496e-b8a7-25c36d87d279","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/350","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:50:28.943Z"}],"sources":[{"listingId":"ddf48376-e2ac-496e-b8a7-25c36d87d279","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/payments/350","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:50:28.943Z","lastSeenAt":"2026-04-23T23:02:46.294Z"}],"details":{"listingId":"ddf48376-e2ac-496e-b8a7-25c36d87d279","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/payments/350 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <signed-x402-payment-header>\"","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"The endpoint returns a 402 x402 challenge with maxAmountRequired of 20000 base units of USDC on Base network","source_url":"https://lowpaymentfee.com/api/v1/payments/350"},{"claim":"All listed 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":"USDC asset address is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base network","source_url":"https://lowpaymentfee.com/api/v1/payments/350"}],"useCases":["Agents needing on-demand API access without signup or API key management","Paying per-call for data analytics, AI inference, or financial data via crypto micropayments","Testing x402 protocol integrations on the Base network"],"bestFor":["Developers wanting zero-commitment, pay-as-you-go API access","AI agents with USDC on Base that need frictionless endpoint access","Prototyping x402 payment flows at low cost ($0.02/call)"],"notFor":["Users who need detailed API documentation or OpenAPI specs before integrating","High-volume production workloads where per-request crypto payments add overhead","Users without a Base-network USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:06.951Z"},"updatedAt":"2026-04-23T23:02:46.294Z"}}