{"id":"a29f288e-ff79-4231-9bc9-1be17e5af9ed","shortId":"rsWhGM","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/12` is listed as \"Premium API Access\" and returns a 402 challenge requesting up to 20,000 base units of USDC (i.e., $0.02 given USDC's 6 decimals) 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 lowpaymentfee.com site offers 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 endpoints are listed at $0.02 per request. However, the specific endpoint being listed here (`/api/v1/transfers/12`) does not clearly map to any of these documented categories — it sits under a `/transfers/` path with a numeric ID, and its description is simply \"Premium API Access\" with no further documentation on what it actually returns.\n\nDocumentation is extremely sparse. The /docs, /api, /pricing, and /README pages all render only a \"Connect wallet\" prompt with no substantive content. There is no OpenAPI spec, no request/response schema documentation, and no examples of what this particular endpoint produces. The endpoint is confirmed live (402 challenge captured), but the actual functionality behind the paywall is unknown.","tags":[],"capabilities":["x402-payment","usdc-base-network","pay-per-request","no-api-key","http-post"],"categories":["api-platform","crypto"],"synonyms":["x402 API","pay-per-call API","USDC micropayment API","Base network API","lowpaymentfee","crypto-paid API"],"warnings":["The /transfers/12 path does not correspond to any documented API category on the site — its actual functionality is unknown.","All documentation pages (/docs, /api, /pricing, /README) render only 'Connect wallet' with no content.","No OpenAPI spec or response schema is available; callers cannot know what they will receive after paying.","The endpoint's purpose is entirely opaque — paying $0.02 may return anything or nothing useful."],"endpointUrl":"https://lowpaymentfee.com/api/v1/transfers/12","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/12","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 via 402 challenge, and pricing is clear ($0.02 USDC per request on Base). However, there is zero documentation on what this specific endpoint actually does — no OpenAPI spec, no request/response examples, and the /docs page is empty. The 'Premium API Access' label is generic and 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'/api/v1/transfers/12':56,164 '/docs':207 '/pricing':209 '/readme':211 '/request':13,28 '/transfers':179 '0.02':12,27,78,154 '000':72 '20':71 '402':66,247 '6':82 'Base network API' 'USDC micropayment API' 'accept':46 'access':62,97,192 'actual':200,252 'advertis':88 'ai':123 'analysi':127 'analyt':117 'api':5,20,38,61,90,114,191 'attach':100 'base':8,23,51,73 'behind':254 'broader':109 'call':4,19,85 'captur':249 'categori':115,174 'challeng':67,248 'classif':130 'clear':167 'confirm':245 'connect':217 'content':223 'convers':147 'crypto-paid API' 'data':116,120 'decim':83 'descript':187 'document':173,196,202,232 'embed':131 'endpoint':55,150,160,240,243 'estim':141 'exampl':235 'exchang':136 'export':121 'extrem':204 'feed':135 'financ':132 'function':253 'gas':140 'generat':148 'geocod':145 'given':79 'header':104 'howev':157 'http-post' 'i.e':77 'id':184 'infrastructur':143 'insight':122 'instant':96 'key':91 'learn':125 'limit':94 'list':58,152,162 'live':246 'lowpaymentfee' 'lowpaymentfee.com':31,110 'machin':124 'map':168 'metric':118 'multipl':113 'network':9,24,52 'no-api-key' 'numer':183 'offer':112 'openapi':227 'page':212 'particular':239 'path':180 'pay':2,17,35 'pay-per-cal':1,16 'pay-per-call API' 'pay-per-request':34 'payment':48,103 'paywal':256 'per':3,18,36,84,155 'platform':6,21,39,87 'premium':60,190 'price':134 'produc':241 'prompt':219 'protocol':44 'quot':139 'rate':93,137 'render':214 'report':119 'request':37,68,107,156 'request/response':230 'return':64,201 'schema':231 'sentiment':126 'simpli':99,189 'sit':176 'site':111 'spars':205 'spec':228 'specif':54,159 'substant':222 'summar':129 'text':128 'token':138 'unit':74 'unknown':258 'usdc':15,30,47,76,80 'usdc-base-network' 'use':41 'util':144 'valid':146 'via':10,25 'wallet':218 'web3':133 'x402':11,26,43,102 'x402 API' 'x402-payment'","prices":[{"id":"78ec5d0f-d50b-4852-b47d-6d82e5bc4bf8","listingId":"a29f288e-ff79-4231-9bc9-1be17e5af9ed","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/12","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T19:27:22.788Z"}],"sources":[{"listingId":"a29f288e-ff79-4231-9bc9-1be17e5af9ed","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/transfers/12","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T19:27:22.788Z","lastSeenAt":"2026-04-23T05:01:49.127Z"}],"details":{"listingId":"a29f288e-ff79-4231-9bc9-1be17e5af9ed","quickStartSnippet":"# The endpoint requires an X-PAYMENT header with a valid x402 payment proof.\n# Without payment, it returns a 402 challenge:\ncurl -X POST https://lowpaymentfee.com/api/v1/transfers/12\n# Response: 402 with x402 challenge (maxAmountRequired: 20000 USDC base units = $0.02)","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"The endpoint returns a 402 challenge with maxAmountRequired of 20000 base units of USDC on Base network","source_url":"https://lowpaymentfee.com/api/v1/transfers/12"},{"claim":"USDC asset address 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/transfers/12"},{"claim":"All endpoints listed at $0.02/request with no API keys, no rate limits, instant access","source_url":"https://lowpaymentfee.com"},{"claim":"Site offers APIs across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"},{"claim":"Documentation pages render only 'Connect wallet' with no substantive content","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Accessing premium API data with per-request USDC micropayments","Agent-driven API consumption without pre-registration or API keys","Programmatic pay-as-you-go access to undocumented premium endpoints"],"bestFor":["Developers who want keyless, pay-per-call API access","AI agents with x402-compatible payment capabilities","Users comfortable paying in USDC on the Base network"],"notFor":["Anyone needing documented request/response schemas before paying","Users who require fiat-only payment methods","Production workloads requiring SLA guarantees or support"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:35.245Z"},"updatedAt":"2026-04-23T05:01:49.127Z"}}