{"id":"5e959976-6c36-4ac0-a67f-6965a6dde777","shortId":"jhR9CT","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 a pay-per-request API platform that uses the x402 protocol to accept USDC payments on the Base network. The specific endpoint `/api/v1/transfers/126` is listed as \"Premium API Access\" and accepts POST requests. The x402 challenge indicates a maximum cost of 20,000 base units of USDC (0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base), which equals $0.02 per request (USDC uses 6 decimals). No API keys or rate limits are required — callers simply attach an x402 payment header to each request.\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 uniformly priced at $0.02 per request. However, the specific functionality of the `/api/v1/transfers/126` endpoint is unclear — it sits under a \"transfers\" path that does not appear in the site's public API listing, and no documentation, request schema, or response schema is available for it.\n\nThe endpoint is live and returns a valid x402 challenge with a 300-second payment timeout. The platform's landing page loads successfully (HTTP 200), but the docs, API, pricing, and README pages all render only a \"Connect wallet\" prompt with no substantive documentation.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","no-api-key","post-endpoint"],"categories":["api-platform","crypto"],"synonyms":["low payment fee","x402 api","pay per call api","usdc api","base network api","micropayment api","402 payment api"],"warnings":["The /api/v1/transfers/126 path does not appear in the site's public API listing — its specific functionality is unknown.","All documentation pages (docs, pricing, README, api) render only 'Connect wallet' with no substantive content.","No request body schema or response schema is documented for this endpoint.","The 'Premium API Access' description is generic and does not explain what the endpoint returns."],"endpointUrl":"https://lowpaymentfee.com/api/v1/transfers/126","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/126","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The endpoint is live and returns a valid x402 challenge, but the specific functionality of /api/v1/transfers/126 is undocumented. No request or response schema is available, and the docs/pricing/README pages are empty beyond a wallet-connect prompt. The 'transfers/126' path doesn't match any publicly listed API category, making it unclear what this endpoint actually 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'/request':13,28 '0.02':12,27,86,158 '000':76 '0x833589fcd6edb6e08f4c7c32d4f71b54bda02913':81 '20':75 '200':224 '300':212 '402 payment api' '6':91 'accept':46,64 'access':62 'advertis':114 'ai':126 'analysi':130 'analyt':120 'api':5,20,38,61,94,116,186,228 'appear':180 'attach':103 'avail':197 'base':8,23,51,77,83 'base network api' 'broader':112 'call':4,19 'caller':101 'categori':117 'challeng':69,209 'classif':133 'connect':237 'convers':150 'cost':73 'data':119,123 'decim':92 'doc':227 'document':190,243 'embed':134 'endpoint':55,153,168,201 'equal':85 'estim':144 'exchang':139 'export':124 'feed':138 'financ':135 'function':164 'gas':143 'generat':151 'geocod':148 'header':107 'howev':161 'http':223 'includ':118 'indic':70 'infrastructur':146 'insight':125 'key':95 'land':219 'learn':128 'limit':98 'list':58,187 'live':203 'load':221 'low payment fee' 'lowpaymentfee.com':31 'machin':127 'maximum':72 'metric':121 'micropayment api' 'multipl':115 'network':9,24,52 'no-api-key' 'page':220,232 'path':176 'pay':2,17,35 'pay per call api' 'pay-per-cal':1,16 'pay-per-request':34 'payment':48,106,214 'per':3,18,36,87,159 'platform':6,21,39,113,217 'post':65 'post-endpoint' 'premium':60 'price':137,156,229 'prompt':239 'protocol':44 'public':185 'quot':142 'rate':97,140 'readm':231 'render':234 'report':122 'request':37,66,88,110,160,191 'requir':100 'respons':194 'return':205 'schema':192,195 'second':213 'sentiment':129 'simpli':102 'sit':172 'site':183 'specif':54,163 'substant':242 'success':222 'summar':132 'text':131 'timeout':215 'token':141 'transfer':175 'unclear':170 'uniform':155 'unit':78 'usdc':15,30,47,80,89 'usdc api' 'usdc-base' 'use':41,90 'util':147 'valid':149,207 'via':10,25 'wallet':238 'web3':136 'x402':11,26,43,68,105,208 'x402 api' 'x402-payment'","prices":[{"id":"f05e3f6d-8c57-457f-9254-413a7e249c1b","listingId":"5e959976-6c36-4ac0-a67f-6965a6dde777","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/126","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T19:27:21.572Z"}],"sources":[{"listingId":"5e959976-6c36-4ac0-a67f-6965a6dde777","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/transfers/126","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T19:27:21.572Z","lastSeenAt":"2026-04-23T05:01:49.081Z"}],"details":{"listingId":"5e959976-6c36-4ac0-a67f-6965a6dde777","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/transfers/126 \\\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 specifies maxAmountRequired of 20000 base units of USDC on Base network","source_url":"https://lowpaymentfee.com/api/v1/transfers/126"},{"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":"The platform offers APIs across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset address is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/transfers/126"}],"useCases":["Making paid API calls without requiring API key registration","Programmatic agent-to-service payments using USDC on Base","Accessing premium API functionality with per-request micropayments"],"bestFor":["Developers who want zero-signup, pay-as-you-go API access","AI agents with x402-compatible payment capabilities","Users who prefer crypto micropayments over subscription billing"],"notFor":["Users who need detailed API documentation or response schemas before integrating","Applications requiring free or subscription-based API access","Users who cannot transact in USDC on the Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:35.278Z"},"updatedAt":"2026-04-23T05:01:49.081Z"}}