{"id":"f9f7d3bb-b04e-4923-ae83-587db9309c13","shortId":"4TnVWs","kind":"x402","title":"Pay-per-call API platform on Base (USDC) covering data, AI, finance, and utility endpoints at $0.02/request.","tagline":"Pay-per-call API platform on Base (USDC) covering data, AI, finance, and utility endpoints at $0.02/request.","description":"lowpaymentfee.com is an x402-enabled API platform that offers a broad catalog of pay-per-request endpoints settled in USDC on the Base network. The specific endpoint at `/api/v1/transfers/33` is listed as \"Premium API Access\" and costs up to $0.02 per call (maxAmountRequired of 20,000 base units of USDC, which is 6-decimal, equaling $0.02). Payment is handled via the x402 protocol — no API keys, accounts, or rate limits are required; callers simply attach an X-PAYMENT header with a valid payment proof.\n\nThe broader platform advertises four endpoint 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\nThe specific functionality behind `/api/v1/transfers/33` is not documented beyond the label \"Premium API Access.\" The crawled docs, pricing, API, and README pages all returned only a \"Connect wallet\" prompt with no additional technical documentation, schemas, or example payloads. Without further documentation it is unclear what data or service this particular endpoint returns. The endpoint is confirmed live — it returns a proper 402 x402 challenge when probed via POST.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","pay-per-request","no-api-key","post-endpoint"],"categories":["api-platform","finance","ai","data"],"synonyms":["low payment fee","micropayment API","x402 API","USDC pay-per-call","Base network API","crypto API payments","402 payment protocol"],"warnings":["The specific functionality of /api/v1/transfers/33 ('Premium API Access') is completely undocumented — it is unclear what data or service it provides.","No OpenAPI spec, request schema, or response schema is available.","All documentation pages (docs, api, pricing, README) returned only a 'Connect wallet' prompt with no technical content.","The broad catalog of endpoints listed on the homepage cannot be verified as functional from the crawl data alone."],"endpointUrl":"https://lowpaymentfee.com/api/v1/transfers/33","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/transfers/33","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The endpoint is confirmed live with a valid x402 402 challenge, but there is no documentation, no OpenAPI schema, no request/response examples, and the specific functionality of /api/v1/transfers/33 is entirely undescribed. The docs, pricing, API, and README pages all returned only 'Connect wallet' with no useful 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'/request':19,38,173 '0.02':18,37,80,96,172 '000':86 '20':85 '402':236 '402 payment protocol' '6':93 'Base network API' 'USDC pay-per-call' 'access':75,188 'account':107 'addit':206 'advertis':129 'ai':12,31,140 'analysi':144 'analyt':134 'api':5,24,45,74,105,187,193 'attach':115 'base':8,27,63,87 'base-network' 'behind':178 'beyond':183 'broad':50 'broader':127 'call':4,23,82 'caller':113 'catalog':51 'categori':132 'challeng':238 'classif':147 'confirm':230 'connect':201 'convers':164 'cost':77 'cover':10,29 'crawl':190 'crypto API payments' 'data':11,30,133,137,220 'decim':94 'doc':191 'document':182,208,215 'embed':148 'enabl':44 'endpoint':16,35,57,67,131,168,225,228 'equal':95 'estim':158 'exampl':211 'exchang':153 'export':138 'feed':152 'financ':13,32,149 'four':130 'function':177 'gas':157 'generat':165 'geocod':162 'handl':99 'header':120 'infrastructur':160 'insight':139 'key':106 'label':185 'learn':142 'limit':110 'list':71,167 'live':231 'low payment fee' 'lowpaymentfee.com':39 'machin':141 'maxamountrequir':83 'metric':135 'micropayment API' 'network':64 'no-api-key' 'offer':48 'page':196 'particular':224 'pay':2,21,54 'pay-per-cal':1,20 'pay-per-request':53 'payload':212 'payment':97,119,124 'per':3,22,55,81 'platform':6,25,46,128 'post':242 'post-endpoint' 'premium':73,186 'price':151,174,192 'probe':240 'prompt':203 'proof':125 'proper':235 'protocol':103 'quot':156 'rate':109,154 'readm':195 'report':136 'request':56 'requir':112 'return':198,226,233 'schema':209 'sentiment':143 'servic':222 'settl':58 'share':169 'simpli':114 'specif':66,176 'summar':146 'technic':207 'text':145 'token':155 'unclear':218 'unit':88 'usdc':9,28,60,90 'usdc-settlement' 'util':15,34,161 'valid':123,163 'via':100,241 'wallet':202 'web3':150 'without':213 'x':118 'x-payment':117 'x402':43,102,237 'x402 API' 'x402-enabled':42 'x402-payment'","prices":[{"id":"4cfa05fe-3198-41e5-b77f-f84e6e76c69b","listingId":"f9f7d3bb-b04e-4923-ae83-587db9309c13","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/transfers/33","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T19:27:41.020Z"}],"sources":[{"listingId":"f9f7d3bb-b04e-4923-ae83-587db9309c13","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/transfers/33","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T19:27:41.020Z","lastSeenAt":"2026-04-22T09:01:48.359Z"}],"details":{"listingId":"f9f7d3bb-b04e-4923-ae83-587db9309c13","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/transfers/33 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-proof>\"","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"Endpoint returns a valid x402 402 challenge with maxAmountRequired of 20000 USDC base units on Base network","source_url":"https://lowpaymentfee.com/api/v1/transfers/33"},{"claim":"USDC asset contract 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/transfers/33"},{"claim":"Platform advertises $0.02/request pricing with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"Platform lists endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Accessing premium API data with per-call USDC micropayments on Base","Agent-driven workflows that need keyless, pay-as-you-go API access","Programmatic access to data/analytics, AI inference, finance, or utility endpoints without subscription commitments"],"bestFor":["Developers wanting zero-commitment, pay-per-use API access","AI agents that can settle x402 payments autonomously on Base","Users who prefer crypto-native micropayments over traditional API key subscriptions"],"notFor":["Users who need detailed API documentation or OpenAPI schemas before integrating","High-volume consumers who would benefit from bulk/subscription pricing"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:34.363Z"},"updatedAt":"2026-04-22T09:01:48.359Z"}}