{"id":"cec370bc-7eb0-4629-a169-9deda47cbafa","shortId":"Lgs3nR","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/charges/112` is labeled \"Premium API Access\" and requires a maximum of 20,000 base units of USDC (i.e., $0.02) per call. The platform advertises no API keys, no rate limits, and instant access — you simply attach an x402 payment header to each request.\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 listed endpoints are priced at $0.02 per request.\n\nDocumentation is extremely sparse. The docs, API, pricing, and README pages all render only a \"Connect wallet\" prompt with no further content. There is no OpenAPI schema, no request/response examples, and no description of what the `/api/v1/charges/112` endpoint specifically returns. The x402 challenge confirms the endpoint is live and accepts POST requests, but the actual functionality behind this particular charge ID is unclear.","tags":[],"capabilities":["x402-payment","usdc-base-network","pay-per-request","no-api-key","post-method","json-response"],"categories":["general","api-platform"],"synonyms":["x402 API","pay per call API","USDC API","Base network API","micropayment API","lowpaymentfee","low payment fee"],"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/charges/112 ('Premium API Access') is not described anywhere","Cannot verify what data or service is actually returned upon successful payment"],"endpointUrl":"https://lowpaymentfee.com/api/v1/charges/112","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/112","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The x402 challenge confirms the endpoint is live and priced at $0.02 USDC on Base. However, there is no OpenAPI schema, no documentation beyond a landing page listing, no request/response examples, and the specific purpose of /api/v1/charges/112 is undocumented. The docs/pricing/README pages are all blank beyond a wallet connect 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'/request':12,31 '0.02':11,30,83,155 '000':77 '20':76 'Base network API' 'USDC API' 'accept':54,207 'access':70,97 'across':113 'actual':212 'advertis':88 'ai':15,34,123 'analysi':127 'analyt':117 'api':5,24,46,69,90,164 'attach':100 'base':8,27,59,78 'behind':214 'broader':109 'call':4,23,85 'categori':115 'challeng':200 'charg':217 'classif':130 'confirm':201 'connect':173 'content':179 'convers':147 'data':14,33,116,120 'descript':190 'doc':163 'document':158 'embed':131 'endpoint':19,38,63,112,151,195,203 'estim':141 'exampl':187 'exchang':136 'export':121 'extrem':160 'feed':135 'financ':16,35,132 'four':114 'function':213 'gas':140 'generat':148 'geocod':145 'header':104 'i.e':82 'id':218 'infrastructur':143 'insight':122 'instant':96 'json-response' 'key':91 'label':67 'learn':125 'limit':94 'list':150 'live':205 'low payment fee' 'lowpaymentfee' 'lowpaymentfee.com':39 'machin':124 'maximum':74 'metric':118 'micropayment API' 'network':60 'no-api-key' 'offer':111 'openapi':183 'page':168 'particular':216 'pay':2,21,43 'pay per call API' 'pay-per-cal':1,20 'pay-per-request':42 'payment':56,103 'per':3,22,44,84,156 'platform':6,25,47,87,110 'post':208 'post-method' 'premium':68 'price':134,153,165 'prompt':175 'protocol':52 'quot':139 'rate':93,137 'readm':167 'render':170 'report':119 'request':45,107,157,209 'request/response':186 'requir':72 'return':197 'schema':184 'sentiment':126 'simpli':99 'spars':161 'specif':62,196 'summar':129 'text':128 'token':138 'unclear':220 'unit':79 'usdc':55,81 'usdc-base-network' 'use':49 'util':18,37,144 'valid':146 'via':9,28 'wallet':174 'web3':133 'x402':10,29,51,102,199 'x402 API' 'x402-payment'","prices":[{"id":"8a3dd8d2-0842-4908-b035-ee91d654efbb","listingId":"cec370bc-7eb0-4629-a169-9deda47cbafa","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/112","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:44:12.186Z"}],"sources":[{"listingId":"cec370bc-7eb0-4629-a169-9deda47cbafa","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/charges/112","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:44:12.186Z","lastSeenAt":"2026-04-22T10:31:30.607Z"}],"details":{"listingId":"cec370bc-7eb0-4629-a169-9deda47cbafa","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/charges/112 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <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 challenge requiring USDC payment of 20,000 base units ($0.02) on Base network","source_url":"https://lowpaymentfee.com/api/v1/charges/112"},{"claim":"The platform lists endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories, all at $0.02/request","source_url":"https://lowpaymentfee.com"},{"claim":"The platform advertises no API keys, no rate limits, instant access, and Base network settlement","source_url":"https://lowpaymentfee.com"},{"claim":"The USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/charges/112"}],"useCases":["Accessing pay-per-call API endpoints without subscription or API key management","Making micropayment-gated requests for data, AI inference, or utility services","Integrating x402-compatible agents with a low-cost general-purpose API platform"],"bestFor":["Agents or developers wanting zero-commitment, pay-as-you-go API access","x402-native workflows on the Base network","Low-cost per-request API consumption without rate limits"],"notFor":["Users needing detailed API documentation or guaranteed SLAs","High-volume batch processing where per-request pricing adds up","Anyone without a Base-network USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:25.085Z"},"updatedAt":"2026-04-22T10:31:30.607Z"}}