{"id":"a278f861-2632-4983-9eae-ebb9567643dd","shortId":"JpFCrm","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/wire/142` is listed as \"Premium API Access\" and accepts POST requests with x402 payment of up to 20,000 base units of USDC (i.e., $0.02 per call, since USDC uses 6 decimals). No API keys or rate limits are advertised; callers simply attach an X-PAYMENT header with a valid x402 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. However, the specific endpoint probed here (`/api/v1/wire/142`) does not clearly map to any of those named categories — its description is simply \"Premium API Access\" with no further documentation on what data or functionality it returns.\n\nThe site's documentation, pricing, and README pages all returned only a \"Connect wallet\" prompt with no substantive content, so there is no detailed API documentation, request/response schemas, or usage examples available. The endpoint is confirmed live (returns a proper 402 x402 challenge), but the lack of documentation about what this particular wire endpoint actually does is a significant gap.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","pay-per-request","no-api-key","post-endpoint"],"categories":["api-platform","payments"],"synonyms":["x402 API","pay-per-call API","USDC micropayment API","Base network API","lowpaymentfee","low payment fee API","crypto-paid API"],"warnings":["No documentation available — docs, pricing, and README pages all return only 'Connect wallet' with no content.","The endpoint path /api/v1/wire/142 does not match any of the named API categories on the homepage; its actual functionality is unknown.","No request or response schema is provided; callers cannot know what to send or what to expect back.","Output schema only specifies HTTP POST method with no body or response details."],"endpointUrl":"https://lowpaymentfee.com/api/v1/wire/142","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/wire/142","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 request/response schema, and no explanation of what /api/v1/wire/142 actually returns. The docs, pricing, and README pages are all empty (just 'Connect wallet'). This is effectively a stub 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'/request':19,38,170 '0.02':18,37,93,169 '000':87 '20':86 '402':247 '6':99 'Base network API' 'USDC micropayment API' 'accept':77 'access':75,195 'actual':261 'advertis':108,126 'ai':12,31,137 'analysi':141 'analyt':131 'api':5,24,45,74,102,194,231 'attach':111 'avail':238 'base':8,27,63,88 'base-network' 'broad':50 'broader':124 'call':4,23,95 'caller':109 'catalog':51 'categori':129,188 'challeng':249 'classif':144 'clear':181 'confirm':242 'connect':219 'content':225 'convers':161 'cover':10,29 'crypto-paid API' 'data':11,30,130,134,202 'decim':100 'descript':190 'detail':230 'document':199,210,232,254 'embed':145 'enabl':44 'endpoint':16,35,57,67,128,165,175,240,260 'estim':155 'exampl':237 'exchang':150 'export':135 'feed':149 'financ':13,32,146 'four':127 'function':204 'gap':266 'gas':154 'generat':162 'geocod':159 'header':116 'howev':172 'i.e':92 'infrastructur':157 'insight':136 'key':103 'lack':252 'learn':139 'limit':106 'list':71,164 'live':243 'low payment fee API' 'lowpaymentfee' 'lowpaymentfee.com':39 'machin':138 'map':182 'metric':132 'name':187 'network':64 'no-api-key' 'offer':48 'page':214 'particular':258 'pay':2,21,54 'pay-per-cal':1,20 'pay-per-call API' 'pay-per-request':53 'payment':82,115,121 'per':3,22,55,94 'platform':6,25,46,125 'post':78 'post-endpoint' 'premium':73,193 'price':148,171,211 'probe':176 'prompt':221 'proof':122 'proper':246 'quot':153 'rate':105,151 'readm':213 'report':133 'request':56,79 'request/response':233 'return':206,216,244 'schema':234 'sentiment':140 'settl':58 'share':166 'signific':265 'simpli':110,192 'sinc':96 'site':208 'specif':66,174 'substant':224 'summar':143 'text':142 'token':152 'unit':89 'usag':236 'usdc':9,28,60,91,97 'usdc-settlement' 'use':98 'util':15,34,158 'valid':119,160 'wallet':220 'web3':147 'wire':259 'x':114 'x-payment':113 'x402':43,81,120,248 'x402 API' 'x402-enabled':42 'x402-payment'","prices":[{"id":"96583a34-c3e0-46af-8f39-16540b3a04b0","listingId":"a278f861-2632-4983-9eae-ebb9567643dd","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/wire/142","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T19:28:43.517Z"}],"sources":[{"listingId":"a278f861-2632-4983-9eae-ebb9567643dd","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/wire/142","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T19:28:43.517Z","lastSeenAt":"2026-04-22T04:02:15.296Z"}],"details":{"listingId":"a278f861-2632-4983-9eae-ebb9567643dd","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/wire/142 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-proof>\" \\\n  -d '{}'","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"The endpoint returns a valid x402 challenge with maxAmountRequired of 20000 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/wire/142"},{"claim":"All listed endpoints are priced at $0.02 per request with no API keys, no rate limits, and instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"The platform offers endpoints in Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/wire/142"}],"useCases":["Programmatic access to paid API endpoints without traditional API key registration","Agent-driven workflows that need instant, keyless API access settled on-chain","Integrating pay-per-use data or utility services into applications via x402 protocol"],"bestFor":["Developers wanting zero-signup, pay-as-you-go API access","AI agents that can settle x402 payments autonomously on Base","Projects needing low-cost per-request pricing without subscriptions"],"notFor":["Users who need detailed API documentation or guaranteed SLAs before integrating","Applications requiring non-crypto payment methods","High-volume use cases where per-request pricing may not be economical"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:31.347Z"},"updatedAt":"2026-04-22T04:02:15.296Z"}}