{"id":"7c832022-afbd-4aa2-bb75-f1390a3945ab","shortId":"386ZYC","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/wire/73` is listed as \"Premium API Access\" and returns a standard x402 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 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 listed at $0.02 per request. However, the specific `/api/v1/wire/73` endpoint does not clearly map to any of these named services — it may be a generic or internal wire endpoint.\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 data or functionality the `/api/v1/wire/73` endpoint actually returns. Callers should be aware that the actual behavior behind this endpoint is unknown from available documentation.","tags":[],"capabilities":["x402-payment","usdc-base-network","pay-per-request","no-api-key","http-post"],"categories":["api-platform","crypto"],"synonyms":["x402 API","USDC pay-per-call","Base network API","micropayment API","lowpaymentfee","low payment fee API","402 payment protocol"],"warnings":["The specific endpoint /api/v1/wire/73 does not correspond to any named service on the site's landing page — its actual functionality is unknown.","All documentation pages (/docs, /api, /pricing, /README) return only a 'Connect wallet' prompt with no usable content.","No OpenAPI schema, no request body schema, and no response examples are available.","The purpose and output of this endpoint cannot be verified from available sources."],"endpointUrl":"https://lowpaymentfee.com/api/v1/wire/73","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/73","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.250","qualityRationale":"The endpoint is live and returns a valid x402 challenge, but there is no documentation, no OpenAPI schema, no request/response examples, and the purpose of /api/v1/wire/73 is entirely unclear. The site's docs pages are empty beyond a wallet connect prompt. This is effectively a stub 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'/api/v1/wire/73':56,167,227 '/docs':193 '/pricing':195 '/readme':197 '/request':13,28 '0.02':12,27,80,161 '000':74 '20':73 '402':68 '402 payment protocol' '6':84 'Base network API' 'USDC pay-per-call' 'accept':46 'access':62,99 'across':120 'actual':229,237 'advertis':90 'ai':130 'analysi':134 'analyt':124 'api':5,20,38,61,92 'attach':102 'avail':245 'awar':234 'base':8,23,51,75 'behavior':238 'behind':239 'broader':115 'call':4,19,87 'caller':100,231 'categori':122 'challeng':69 'classif':137 'clear':171 'connect':203 'content':209 'convers':154 'data':123,127,223 'decim':85 'descript':220 'document':188,246 'embed':138 'endpoint':55,119,157,168,187,228,241 'estim':148 'exampl':217 'exchang':143 'export':128 'extrem':190 'feed':142 'financ':139 'four':121 'function':225 'gas':147 'generat':155 'generic':183 'geocod':152 'given':81 'header':107 'howev':164 'http-post' 'i.e':79 'infrastructur':150 'insight':129 'instant':98 'intern':185 'key':93 'learn':132 'limit':96 'list':58,159 'low payment fee API' 'lowpaymentfee' 'lowpaymentfee.com':31,116 'machin':131 'map':172 'may':180 'metric':125 'micropayment API' 'name':177 'network':9,24,52 'no-api-key' 'offer':118 'openapi':213 'page':198 'pay':2,17,35 'pay-per-cal':1,16 'pay-per-request':34 'payment':48,106,112 'per':3,18,36,86,162 'platform':6,21,39,89 'premium':60 'price':141 'prompt':205 'proof':113 'protocol':44 'quot':146 'rate':95,144 'render':200 'report':126 'request':37,70,163 'request/response':216 'return':64,230 'schema':214 'sentiment':133 'servic':178 'simpli':101 'site':117 'spars':191 'specif':54,166 'standard':66 'substant':208 'summar':136 'text':135 'token':145 'unit':76 'unknown':243 'usdc':15,30,47,78,82 'usdc-base-network' 'use':41 'util':151 'valid':110,153 'via':10,25 'wallet':204 'web3':140 'wire':186 'x':105 'x-payment':104 'x402':11,26,43,67,111 'x402 API' 'x402-payment'","prices":[{"id":"c7ccaf19-b563-44f6-adcf-71988728acc7","listingId":"7c832022-afbd-4aa2-bb75-f1390a3945ab","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/73","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T19:29:14.364Z"}],"sources":[{"listingId":"7c832022-afbd-4aa2-bb75-f1390a3945ab","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/wire/73","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T19:29:14.364Z","lastSeenAt":"2026-04-22T16:32:23.577Z"}],"details":{"listingId":"7c832022-afbd-4aa2-bb75-f1390a3945ab","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/wire/73 \\\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/wire/73"},{"claim":"USDC asset address 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/wire/73"},{"claim":"All endpoints listed at $0.02 per request with no API keys, no rate limits, instant access","source_url":"https://lowpaymentfee.com"},{"claim":"Site offers endpoints in Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"},{"claim":"Documentation pages render only a Connect wallet prompt","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Programmatic access to a pay-per-call API without needing API keys or subscriptions","Agent-driven workflows that settle per-request costs in USDC on Base","Testing x402 protocol integrations with a low-cost endpoint"],"bestFor":["Developers experimenting with x402 payment protocol","Agents needing keyless, pay-as-you-go API access","Low-cost per-request API consumption settled on-chain"],"notFor":["Users who need detailed API documentation or guaranteed SLAs","Anyone requiring known, well-documented response schemas before integrating","High-volume use cases where $0.02/request adds up without bulk discounts"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:29.844Z"},"updatedAt":"2026-04-22T16:32:23.577Z"}}