{"id":"60a51444-16c5-4be2-b1ec-331169fc7aa1","shortId":"qqXvrq","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/charges/380` 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. No API keys or rate limits are required — callers simply attach an X-PAYMENT header with a valid x402 payment proof.\n\nThe broader platform advertises multiple API categories including 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 the same $0.02/request price point. However, the specific endpoint probed (`/api/v1/charges/380`) does not clearly map to any of these named services — it may be a generic or catch-all premium access route.\n\nDocumentation is extremely sparse. The /docs, /api, /pricing, and /README pages all returned 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/charges/380` endpoint actually returns. The endpoint is confirmed live (402 challenge captured), but without documentation it is unclear what payload to send or what response to expect.","tags":[],"capabilities":["x402-payment","usdc-base-network","pay-per-request","no-api-key","http-post"],"categories":["api-platform","finance","llm","geo"],"synonyms":["x402 API","micropayment API","USDC pay-per-call","Base network API","lowpaymentfee","low payment fee API","crypto API access"],"warnings":["No documentation available — /docs, /api, /pricing, and /README pages all show only 'Connect wallet' with no content","No OpenAPI or schema describing request parameters or response format","The endpoint path /api/v1/charges/380 does not match any of the advertised API routes on the homepage","Cannot determine what data or functionality this specific endpoint provides"],"endpointUrl":"https://lowpaymentfee.com/api/v1/charges/380","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/charges/380","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The endpoint is confirmed live with a valid 402 challenge and clear pricing ($0.02 USDC on Base). However, documentation is essentially nonexistent — no OpenAPI schema, no request/response examples, and no explanation of what the endpoint actually does beyond the label \"Premium API Access.\" The specific path /api/v1/charges/380 doesn't correspond to any documented 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'/api/v1/charges/380':57,166,228 '/call':13,28 '/docs':194 '/pricing':196 '/readme':198 '/request':158 '0.02':12,27,79,157 '000':73 '20':72 '402':67,237 '6':83 'Base network API' 'USDC pay-per-call' 'accept':46 'access':63,187 'actual':230 'advertis':112 'ai':124 'analysi':128 'analyt':118 'api':5,20,38,62,88,114 'attach':97 'base':8,23,51,74 'broader':110 'call':86 'caller':95 'captur':239 'catch':184 'catch-al':183 'categori':115 'challeng':68,238 'classif':131 'clear':169 'confirm':235 'connect':204 'content':210 'convers':148 'crypto API access' 'data':117,121,224 'decim':84 'descript':221 'document':189,242 'embed':132 'endpoint':55,151,164,229,233 'estim':142 'exampl':218 'exchang':137 'expect':254 'export':122 'extrem':191 'feed':136 'financ':133 'function':226 'gas':141 'generat':149 'generic':181 'geocod':146 'given':80 'header':102 'howev':161 'http-post' 'i.e':78 'includ':116 'infrastructur':144 'insight':123 'key':89 'learn':126 'limit':92 'list':59,153 'live':236 'low payment fee API' 'lowpaymentfee' 'lowpaymentfee.com':31 'machin':125 'map':170 'may':178 'metric':119 'micropayment API' 'multipl':113 'name':175 'network':9,24,52 'no-api-key' 'openapi':214 'page':199 'pay':2,17,35 'pay-per-request':1,16,34 'payload':247 'payment':48,101,107 'per':3,18,36,85 'platform':6,21,39,111 'point':160 'premium':61,186 'price':135,159 'probe':165 'prompt':206 'proof':108 'protocol':44 'quot':140 'rate':91,138 'report':120 'request':4,19,37,69 'request/response':217 'requir':94 'respons':252 'return':65,201,231 'rout':188 'schema':215 'send':249 'sentiment':127 'servic':176 'simpli':96 'spars':192 'specif':54,163 'substant':209 'summar':130 'text':129 'token':139 'unclear':245 'unit':75 'usdc':15,30,47,77,81 'usdc-base-network' 'use':41 'util':145 'valid':105,147 'via':10,25 'wallet':205 'web3':134 'without':241 'x':100 'x-payment':99 'x402':11,26,43,106 'x402 API' 'x402-payment'","prices":[{"id":"ce4a6f3a-9e9e-495c-a267-26080b5b3b0c","listingId":"60a51444-16c5-4be2-b1ec-331169fc7aa1","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/charges/380","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:45:20.525Z"}],"sources":[{"listingId":"60a51444-16c5-4be2-b1ec-331169fc7aa1","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/charges/380","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:45:20.525Z","lastSeenAt":"2026-04-23T08:01:18.805Z"}],"details":{"listingId":"60a51444-16c5-4be2-b1ec-331169fc7aa1","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/charges/380 \\\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/charges/380"},{"claim":"USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/charges/380"},{"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":"Platform advertises categories: Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure","source_url":"https://lowpaymentfee.com"}],"useCases":["Paying per-request for API access without managing API keys or subscriptions","Integrating USDC-settled micropayments into automated agent workflows","Accessing data analytics, AI inference, or financial data endpoints on a pay-as-you-go basis"],"bestFor":["Developers wanting zero-commitment, pay-per-use API access","AI agents with x402-compatible payment capabilities on Base","Users who prefer crypto micropayments over traditional billing"],"notFor":["Users needing detailed API documentation or OpenAPI specs before integrating","High-volume consumers who need bulk pricing or SLAs","Anyone without a Base-network USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:21.815Z"},"updatedAt":"2026-04-23T08:01:18.805Z"}}