{"id":"5b4e9cf6-bf97-440b-a76b-77a45fa17f67","shortId":"Cq4HMp","kind":"x402","title":"Pay-per-call API platform on Base (USDC) via x402 — $0.02/request, no API keys required.","tagline":"Pay-per-call API platform on Base (USDC) via x402 — $0.02/request, no API keys required.","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/payments/72` is listed as \"Premium API Access\" and charges up to 20,000 base units of USDC (i.e., $0.02 given USDC's 6 decimals) per call. No API keys, rate limits, or upfront commitments are required — each request is settled individually via an on-chain micropayment.\n\nThe broader platform advertises several categories of endpoints: 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.\n\nHowever, the specific functionality behind `/api/v1/payments/72` is not documented beyond the label \"Premium API Access.\" The crawled docs, pricing, and API pages all returned only a \"Connect wallet\" prompt with no further technical documentation, schemas, or example payloads. Without additional documentation it is unclear what data or service this particular endpoint returns when a valid payment is submitted.","tags":[],"capabilities":["x402-payment","usdc-base-network","pay-per-request","no-api-key","micropayment","json-response"],"categories":["payments","infrastructure"],"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, pricing, and API pages all return only a 'Connect wallet' prompt with no technical content.","The specific functionality of /api/v1/payments/72 ('Premium API Access') is not described anywhere; it is unclear what data or service is returned upon successful payment.","No OpenAPI schema, request/response examples, or input parameters are documented.","The platform lists many endpoint categories (AI, finance, analytics, etc.) but none have visible documentation to verify they actually function."],"endpointUrl":"https://lowpaymentfee.com/api/v1/payments/72","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/payments/72","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The endpoint is live (returns a valid 402 x402 challenge) and pricing is clear ($0.02 USDC on Base). However, there is no documentation, no OpenAPI schema, no example request/response payloads, and the actual functionality behind 'Premium API Access' is undefined. The docs/pricing/API pages all render only a wallet-connect prompt with no useful 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'/request':13,30,155 '0.02':12,29,78,154 '000':72 '20':71 '6':82 'Base network API' 'USDC pay-per-call' 'accept':50 'access':66,171 'addit':196 'advertis':110 'ai':122 'analysi':126 'analyt':116 'api':5,15,22,32,42,65,87,170,177 'base':8,25,55,73 'behind':161 'beyond':166 'broader':108 'call':4,21,85 'categori':112 'chain':105 'charg':68 'classif':129 'commit':93 'connect':183 'convers':146 'crawl':173 'crypto API access' 'data':115,119,202 'decim':83 'doc':174 'document':165,190,197 'embed':130 'endpoint':59,114,150,207 'estim':140 'exampl':193 'exchang':135 'export':120 'feed':134 'financ':131 'function':160 'gas':139 'generat':147 'geocod':144 'given':79 'howev':157 'i.e':77 'individu':100 'infrastructur':142 'insight':121 'json-response' 'key':16,33,88 'label':168 'learn':124 'limit':90 'list':62,149 'low payment fee API' 'lowpaymentfee' 'lowpaymentfee.com':35 'machin':123 'metric':117 'micropay':106 'micropayment' 'micropayment API' 'network':56 'no-api-key' 'on-chain':103 'page':178 'particular':206 'pay':2,19,39 'pay-per-cal':1,18 'pay-per-request':38 'payload':194 'payment':52,212 'per':3,20,40,84 'platform':6,23,43,109 'premium':64,169 'price':133,156,175 'prompt':185 'protocol':48 'quot':138 'rate':89,136 'report':118 'request':41,97 'requir':17,34,95 'return':180,208 'schema':191 'sentiment':125 'servic':204 'settl':99 'sever':111 'share':151 'specif':58,159 'submit':214 'summar':128 'technic':189 'text':127 'token':137 'unclear':200 'unit':74 'upfront':92 'usdc':9,26,51,76,80 'usdc-base-network' 'use':45 'util':143 'valid':145,211 'via':10,27,101 'wallet':184 'web3':132 'without':195 'x402':11,28,47 'x402 API' 'x402-payment'","prices":[{"id":"56882737-446b-4c2d-81b0-334c57af8a2a","listingId":"5b4e9cf6-bf97-440b-a76b-77a45fa17f67","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/payments/72","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:50:56.882Z"}],"sources":[{"listingId":"5b4e9cf6-bf97-440b-a76b-77a45fa17f67","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/payments/72","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:50:56.882Z","lastSeenAt":"2026-04-23T19:01:22.865Z"}],"details":{"listingId":"5b4e9cf6-bf97-440b-a76b-77a45fa17f67","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/payments/72 \\\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 x402 challenge with maxAmountRequired of 20000 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/payments/72"},{"claim":"USDC asset contract on Base: 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/payments/72"},{"claim":"Platform advertises $0.02/request pricing with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"Platform lists endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Programmatic access to premium API services with per-call USDC micropayments","Agent-driven workflows that need keyless, on-demand API access settled on Base","Testing x402 protocol integrations with a low-cost endpoint"],"bestFor":["Developers exploring x402 pay-per-call patterns","AI agents that can settle USDC payments on Base autonomously","Users who want no-commitment, no-signup API access"],"notFor":["Users who need detailed API documentation or guaranteed SLAs before paying","High-volume use cases where $0.02/request adds up and a subscription would be cheaper","Anyone without a Base-compatible USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:05.551Z"},"updatedAt":"2026-04-23T19:01:22.865Z"}}