{"id":"f8595447-b43b-4821-b29e-5c03063c9d4a","shortId":"9Vap3j","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 an x402-enabled API platform that offers a variety of endpoints across data analytics, AI/ML inference, finance/Web3, and infrastructure utilities. All endpoints are pay-per-request at $0.02 each, settled in USDC on the Base network. No API keys, rate limits, or subscriptions are required — callers simply attach an x402 payment header to each request.\n\nThe specific endpoint at `/api/v1/charges/364` is listed as \"Premium API Access\" and requires a maximum of 20,000 base units of USDC (i.e., $0.02, since USDC has 6 decimals) per call. The x402 challenge confirms the endpoint is live, accepts the `exact` payment scheme, and responds with `application/json`. The payment is directed to address `0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3` on Base, with a 300-second timeout.\n\nThe broader platform advertises endpoints for sentiment analysis, text summarization, classification, embeddings, price feeds, exchange rates, token quotes, gas estimates, geocoding, validation, conversion, and data generation — all at the same $0.02 price point. However, documentation beyond the landing page is essentially empty (all doc/pricing/API pages only show a \"Connect wallet\" prompt), so the actual request/response schemas for individual endpoints are unknown. Without OpenAPI specs or example payloads, integrators will need to experiment or contact the provider to understand input/output formats.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","pay-per-request","no-api-key","json-response","ai-inference","data-analytics","finance-data","utility-services"],"categories":["api-platform","ai","finance","data"],"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 — all doc pages return only a 'Connect wallet' prompt","The specific functionality of /api/v1/charges/364 ('Premium API Access') is not described anywhere","Request and response formats are completely undocumented; integration requires guesswork","The platform lists many endpoints on its landing page but none have documented input/output schemas"],"endpointUrl":"https://lowpaymentfee.com/api/v1/charges/364","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/364","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The x402 challenge is live and confirms pricing and payment details, but there is no OpenAPI schema, no request/response examples, and all documentation pages are empty stubs showing only 'Connect wallet'. The specific purpose of the /charges/364 endpoint beyond 'Premium API Access' is 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'/request':13,28 '0.02':12,27,62,113,182 '000':107 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':144 '20':106 '300':149 '402 payment API' '6':117 'Base network API' 'USDC API' 'accept':129 'access':100 'across':45 'actual':205 'address':143 'advertis':155 'ai-inference' 'ai/ml':48 'analysi':159 'analyt':47 'api':5,20,37,72,99 'application/json':137 'attach':82 'base':8,23,69,108,146 'base-network' 'beyond':187 'broader':153 'call':4,19,120 'caller':80 'challeng':123 'classif':162 'confirm':124 'connect':200 'contact':225 'convers':174 'data':46,176 'data-analytics' 'decim':118 'direct':141 'doc/pricing/api':195 'document':186 'embed':163 'empti':193 'enabl':36 'endpoint':44,55,92,126,156,210 'essenti':192 'estim':171 'exact':131 'exampl':217 'exchang':166 'experi':223 'feed':165 'finance-data' 'finance/web3':50 'format':231 'gas':170 'generat':177 'geocod':172 'header':86 'howev':185 'i.e':112 'individu':209 'infer':49 'infrastructur':52 'input/output':230 'integr':219 'json-response' 'key':73 'land':189 'limit':75 'list':96 'live':128 'low payment fee' 'lowpaymentfee.com':31 'maximum':104 'micropayment API' 'need':221 'network':9,24,70 'no-api-key' 'offer':40 'openapi':214 'page':190,196 'pay':2,17,58 'pay per call API' 'pay-per-cal':1,16 'pay-per-request':57 'payload':218 'payment':85,132,139 'per':3,18,59,119 'platform':6,21,38,154 'point':184 'premium':98 'price':164,183 'prompt':202 'provid':227 'quot':169 'rate':74,167 'request':60,89 'request/response':206 'requir':79,102 'respond':135 'schema':207 'scheme':133 'second':150 'sentiment':158 'settl':64 'show':198 'simpli':81 'sinc':114 'spec':215 'specif':91 'subscript':77 'summar':161 'text':160 'timeout':151 'token':168 'understand':229 'unit':109 'unknown':212 'usdc':15,30,66,111,115 'usdc-settlement' 'util':53 'utility-services' 'valid':173 'varieti':42 'via':10,25 'wallet':201 'without':213 'x402':11,26,35,84,122 'x402 API' 'x402-enabled':34 'x402-payment'","prices":[{"id":"19ff4686-e7b8-413b-89c8-dc3fe7ad8726","listingId":"f8595447-b43b-4821-b29e-5c03063c9d4a","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/364","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:45:13.325Z"}],"sources":[{"listingId":"f8595447-b43b-4821-b29e-5c03063c9d4a","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/charges/364","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:45:13.325Z","lastSeenAt":"2026-04-22T16:31:16.687Z"}],"details":{"listingId":"f8595447-b43b-4821-b29e-5c03063c9d4a","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/charges/364 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-token>\" \\\n  -d '{}'","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"All endpoints are priced at $0.02 per request with no API keys, rate limits, or minimums","source_url":"https://lowpaymentfee.com"},{"claim":"The platform offers endpoints across Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"},{"claim":"The x402 challenge for /api/v1/charges/364 requires maxAmountRequired of 20000 base units of USDC on Base network","source_url":"https://lowpaymentfee.com/api/v1/charges/364"},{"claim":"Payment is directed to address 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3 with 300-second timeout","source_url":"https://lowpaymentfee.com/api/v1/charges/364"},{"claim":"USDC asset contract on Base: 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/charges/364"}],"useCases":["Accessing AI inference endpoints (sentiment, summarization, classification, embeddings) without subscriptions","Fetching real-time financial data like token quotes, exchange rates, and gas estimates","Running utility operations like geocoding, validation, and data conversion on a per-call basis","Exporting data or generating analytics reports with per-request billing"],"bestFor":["Agents or developers who want zero-commitment, pay-as-you-go API access","Use cases requiring low-cost micropayments per API call ($0.02)","Crypto-native workflows already operating on the Base network"],"notFor":["Users who need detailed API documentation or OpenAPI schemas before integrating","High-volume use cases where per-request pricing may add up compared to subscription plans","Developers without access to USDC on the Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:22.276Z"},"updatedAt":"2026-04-22T16:31:16.687Z"}}