{"id":"fcbeaa4e-dcec-4c61-bcbd-4daf635c6966","shortId":"hdVyf3","kind":"x402","title":"Pay-per-request API platform on Base network via x402 — $0.02/call in USDC.","tagline":"Pay-per-request API platform on Base network via x402 — $0.02/call 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 at /api/v1/orders/63 is labeled \"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 — callers simply attach an X-PAYMENT header with a valid x402 payment proof.\n\nThe broader lowpaymentfee.com site lists 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 (geocoding, validation, conversion, generation). All endpoints are listed at $0.02 per request. However, the specific endpoint being listed here (/api/v1/orders/63) is described only as \"Premium API Access\" with no further documentation on what data or functionality it 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 schema, no request/response examples, and no description of what the /orders/63 endpoint actually does. The endpoint is confirmed live (402 challenge captured), but the lack of documentation makes it difficult to determine its actual purpose or output format.","tags":[],"capabilities":["x402-payment","usdc-base-network","pay-per-request","no-api-key","json-response"],"categories":["api-platform","crypto"],"synonyms":["x402 API","pay-per-call API","USDC micropayment API","Base network API","lowpaymentfee","402 payment API"],"warnings":["No documentation available — /docs, /api, /pricing, and /README pages are all empty (only show 'Connect wallet')","No OpenAPI or schema describing request parameters or response format for /api/v1/orders/63","The purpose of the /orders/63 endpoint is unclear — 'Premium API Access' is not descriptive","No request or response examples available anywhere in crawled content"],"endpointUrl":"https://lowpaymentfee.com/api/v1/orders/63","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/orders/63","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 402 challenge, but there is no documentation, no OpenAPI schema, no request/response examples, and no description of what /api/v1/orders/63 actually returns. The site's docs pages are empty beyond a wallet-connect prompt. This is effectively a stub 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'/api/v1/orders/63':57,168 '/call':13,28 '/docs':192 '/orders/63':223 '/pricing':194 '/readme':196 '0.02':12,27,78,158 '000':72 '20':71 '402':66,232 '402 payment API' '6':82 'Base network API' 'USDC micropayment API' 'accept':46 'access':62,97,175 'across':118 'actual':225,246 'advertis':88 'ai':128 'analysi':132 'analyt':122 'api':5,20,38,61,90,174 'attach':100 'base':8,23,51,73 'broader':113 'call':85 'caller':98 'captur':234 'categori':120 'challeng':67,233 'classif':135 'confirm':230 'connect':202 'content':208 'convers':151 'data':121,125,182 'decim':83 'describ':170 'descript':219 'determin':244 'difficult':242 'document':179,187,239 'embed':136 'endpoint':55,117,154,164,224,228 'estim':146 'exampl':216 'exchang':141 'export':126 'extrem':189 'feed':140 'financ':137 'format':250 'four':119 'function':184 'gas':145 'generat':152 'geocod':149 'given':79 'header':105 'howev':161 'i.e':77 'infrastructur':148 'insight':127 'instant':96 'json-response' 'key':91 'label':59 'lack':237 'learn':130 'limit':94 'list':116,156,166 'live':231 'lowpaymentfee' 'lowpaymentfee.com':31,114 'machin':129 'make':240 'metric':123 'network':9,24,52 'no-api-key' 'openapi':212 'output':249 'page':197 'pay':2,17,35 'pay-per-call API' 'pay-per-request':1,16,34 'payment':48,104,110 'per':3,18,36,84,159 'platform':6,21,39,87 'premium':60,173 'price':139 'prompt':204 'proof':111 'protocol':44 'purpos':247 'quot':144 'rate':93,142 'render':199 'report':124 'request':4,19,37,68,160 'request/response':215 'return':64,186 'schema':213 'sentiment':131 'simpli':99 'site':115 'spars':190 'specif':54,163 'substant':207 'summar':134 'text':133 'token':143 'unit':74 'usdc':15,30,47,76,80 'usdc-base-network' 'use':41 'valid':108,150 'via':10,25 'wallet':203 'web3':138 'x':103 'x-payment':102 'x402':11,26,43,109 'x402 API' 'x402-payment'","prices":[{"id":"5c550517-4897-4755-8f1b-eec1a715e92c","listingId":"fcbeaa4e-dcec-4c61-bcbd-4daf635c6966","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/orders/63","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:36:08.843Z"}],"sources":[{"listingId":"fcbeaa4e-dcec-4c61-bcbd-4daf635c6966","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/orders/63","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:36:08.843Z","lastSeenAt":"2026-04-24T10:32:05.562Z"}],"details":{"listingId":"fcbeaa4e-dcec-4c61-bcbd-4daf635c6966","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/orders/63 \\\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":"The endpoint returns a 402 challenge requesting up to 20,000 base units of USDC on Base network","source_url":"https://lowpaymentfee.com/api/v1/orders/63"},{"claim":"USDC asset address 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/orders/63"},{"claim":"All listed 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 site lists endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"},{"claim":"Documentation pages (/docs, /api, /pricing, /README) render only a 'Connect wallet' prompt","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 various utility endpoints"],"bestFor":["Developers wanting zero-signup, pay-per-call API access","AI agents that can settle x402 payments on Base","Users who prefer crypto micropayments over subscription billing"],"notFor":["Users needing detailed API documentation or OpenAPI specs before integrating","High-volume use cases where per-request pricing may add up","Anyone without a Base-network USDC wallet or x402-compatible client"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:48.745Z"},"updatedAt":"2026-04-24T10:32:05.562Z"}}