{"id":"310b4831-70ff-462e-9900-81d4e3b0ad19","shortId":"tUNUav","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/192` is listed as \"Premium API Access\" and returns a 402 challenge requesting up to 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 endpoints are priced at $0.02 per request.\n\nThis particular endpoint (`/api/v1/transfers/192`) is labeled \"Premium API Access\" but its actual functionality is not documented beyond that title. The crawled docs, pricing, API, and README pages all returned only a \"Connect wallet\" prompt with no further content. Without documentation or an output schema describing what this endpoint returns, its specific behavior must be considered unknown. The x402 challenge confirms it is live and accepts POST requests settling in USDC on Base.","tags":[],"capabilities":["x402-payment","pay-per-request","usdc-settlement","base-network","post-method","json-response"],"categories":["api-platform","infrastructure"],"synonyms":["x402 API","pay-per-call API","USDC micropayment API","Base network API","lowpaymentfee","low payment fee API","crypto-paid API"],"warnings":["The specific functionality of /api/v1/transfers/192 is unknown — 'Premium API Access' is not descriptive and no documentation is available.","All documentation pages (docs, pricing, README, api) returned only a 'Connect wallet' prompt with no usable content.","No OpenAPI spec, no request body schema, and no response schema are provided.","The endpoint path includes a numeric ID (192) which may refer to a specific resource whose nature is unclear."],"endpointUrl":"https://lowpaymentfee.com/api/v1/transfers/192","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/192","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The x402 challenge is live and confirms pricing ($0.02 USDC on Base), but the endpoint's actual functionality is undocumented. All docs/pricing/README pages returned only 'Connect wallet' with no content. No OpenAPI schema, no request/response examples, and the endpoint name 'Premium API Access' is generic and 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'/request':13,28 '0.02':12,27,78,149 '000':72 '20':71 '402':66 'Base network API' 'USDC micropayment API' 'accept':46,216 'access':62,92,160 'across':108 'actual':163 'advertis':83 'ai':118 'analysi':122 'analyt':112 'api':5,20,38,61,85,159,175 'attach':95 'base':8,23,51,73,223 'base-network' 'behavior':203 'beyond':168 'broader':104 'call':4,19,80 'categori':110 'challeng':67,210 'classif':125 'confirm':211 'connect':183 'consid':206 'content':189 'convers':142 'crawl':172 'crypto-paid API' 'data':111,115 'describ':196 'doc':173 'document':167,191 'embed':126 'endpoint':55,107,145,154,199 'estim':136 'exchang':131 'export':116 'feed':130 'financ':127 'four':109 'function':164 'gas':135 'generat':143 'geocod':140 'header':99 'i.e':77 'infrastructur':138 'insight':117 'instant':91 'json-response' 'key':86 'label':157 'learn':120 'limit':89 'list':58 'live':214 'low payment fee API' 'lowpaymentfee' 'lowpaymentfee.com':31 'machin':119 'metric':113 'must':204 'network':9,24,52 'offer':106 'output':194 'page':178 'particular':153 'pay':2,17,35 'pay-per-cal':1,16 'pay-per-call API' 'pay-per-request':34 'payment':48,98 'per':3,18,36,79,150 'platform':6,21,39,82,105 'post':217 'post-method' 'premium':60,158 'price':129,147,174 'prompt':185 'protocol':44 'quot':134 'rate':88,132 'readm':177 'report':114 'request':37,68,102,151,218 'return':64,180,200 'schema':195 'sentiment':121 'settl':219 'simpli':94 'specif':54,202 'summar':124 'text':123 'titl':170 'token':133 'unit':74 'unknown':207 'usdc':15,30,47,76,221 'usdc-settlement' 'use':41 'util':139 'valid':141 'via':10,25 'wallet':184 'web3':128 'without':190 'x402':11,26,43,97,209 'x402 API' 'x402-payment'","prices":[{"id":"4d5cd1c8-701c-4430-bdf6-ef65cac66c8b","listingId":"310b4831-70ff-462e-9900-81d4e3b0ad19","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/192","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T19:27:40.385Z"}],"sources":[{"listingId":"310b4831-70ff-462e-9900-81d4e3b0ad19","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/transfers/192","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T19:27:40.385Z","lastSeenAt":"2026-04-23T02:01:53.291Z"}],"details":{"listingId":"310b4831-70ff-462e-9900-81d4e3b0ad19","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/transfers/192 \\\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 endpoint returns a 402 challenge requesting up to 20,000 base units of USDC ($0.02) on Base network","source_url":"https://lowpaymentfee.com/api/v1/transfers/192"},{"claim":"The platform advertises $0.02/request pricing with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset contract on Base: 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/transfers/192"},{"claim":"The platform offers endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Accessing premium API functionality with per-request USDC micropayments on Base","Agent-driven workflows that need keyless, pay-as-you-go API access","Programmatic access without subscription commitments or API key management"],"bestFor":["Developers who want to pay per request without API keys or subscriptions","AI agents that can settle x402 payments autonomously on Base","Users who prefer crypto-native micropayment access to utility APIs"],"notFor":["Users who need detailed API documentation or guaranteed SLAs before integrating","High-volume consumers who would benefit from bulk pricing or rate-limited tiers","Anyone without a Base-compatible USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:34.421Z"},"updatedAt":"2026-04-23T02:01:53.291Z"}}