{"id":"b885e40c-03ba-41be-8756-975b1adde2d2","shortId":"Lu6RRr","kind":"x402","title":"Pay-per-call premium API access on Base via x402 — $0.02/request in USDC.","tagline":"Pay-per-call premium API access on Base via x402 — $0.02/request in USDC.","description":"lowpaymentfee.com hosts a collection of pay-per-request API endpoints accessible via the x402 payment protocol on the Base network. The specific endpoint at `/api/v1/payments/12` is labeled \"Premium API Access\" and accepts POST requests. Payment is settled in USDC (contract 0x8335…2913 on Base) with a maximum amount of 20,000 base units, which equals $0.02 per call (USDC uses 6 decimals). No API keys, rate limits, or upfront commitments are required — callers simply attach an X-PAYMENT header with a valid x402 payment proof.\n\nThe broader lowpaymentfee.com platform advertises 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 listed endpoints are priced at $0.02 per request.\n\nDocumentation is extremely sparse — the /docs, /pricing, /api, and /README pages all returned only a \"Connect wallet\" prompt with no further content. There is no OpenAPI schema, no request/response examples, and no detailed description of what the `/api/v1/payments/12` endpoint actually returns. The endpoint is live (returns a valid 402 challenge), but without documentation it is unclear what data or functionality \"Premium API Access\" provides beyond its name.","tags":[],"capabilities":["x402-payment","per-request-billing","usdc-settlement","base-network","post-method","no-api-key","pay-per-use"],"categories":["api-gateway","payments"],"synonyms":["x402 API","micropayment API","pay-per-call","USDC API","Base network API","lowpaymentfee","crypto-paid API","402 payment endpoint"],"warnings":["No documentation available — /docs, /pricing, /api, and /README pages all return only 'Connect wallet' with no content","No OpenAPI or schema describing request parameters or response format","The purpose of '/api/v1/payments/12' is unclear — 'Premium API Access' is a generic label with no specifics","No request or response examples available anywhere in crawled content"],"endpointUrl":"https://lowpaymentfee.com/api/v1/payments/12","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/12","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 with clear pricing ($0.02 USDC on Base). However, there is no OpenAPI schema, no request/response examples, and all documentation pages are empty stubs showing only 'Connect wallet'. The actual functionality behind 'Premium API Access' is completely undocumented, making this effectively a stub 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'/api/v1/payments/12':56,206 '/docs':174 '/pricing':175 '/readme':178 '/request':13,28 '0.02':12,27,87,166 '000':82 '0x8335':72 '20':81 '2913':73 '402':217 '402 payment endpoint' '6':92 'Base network API' 'USDC API' 'accept':63 'access':7,22,42,61,231 'across':124 'actual':208 'advertis':122 'ai':134 'amount':79 'analysi':138 'analyt':128 'api':6,21,40,60,95,230 'attach':106 'base':9,24,50,75,83 'base-network' 'beyond':233 'broader':119 'call':4,19,89 'caller':104 'categori':126 'challeng':218 'classif':141 'collect':34 'commit':101 'connect':184 'content':190 'contract':71 'convers':158 'crypto-paid API' 'data':127,131,226 'decim':93 'descript':202 'detail':201 'document':169,221 'embed':142 'endpoint':41,54,123,162,207,211 'equal':86 'estim':152 'exampl':198 'exchang':147 'export':132 'extrem':171 'feed':146 'financ':143 'four':125 'function':228 'gas':151 'generat':159 'geocod':156 'header':111 'host':32 'infrastructur':154 'insight':133 'key':96 'label':58 'learn':136 'limit':98 'list':161 'live':213 'lowpaymentfee' 'lowpaymentfee.com':31,120 'machin':135 'maximum':78 'metric':129 'micropayment API' 'name':235 'network':51 'no-api-key' 'openapi':194 'page':179 'pay':2,17,37 'pay-per-cal':1,16 'pay-per-call' 'pay-per-request':36 'pay-per-use' 'payment':46,66,110,116 'per':3,18,38,88,167 'per-request-billing' 'platform':121 'post':64 'post-method' 'premium':5,20,59,229 'price':145,164 'prompt':186 'proof':117 'protocol':47 'provid':232 'quot':150 'rate':97,148 'report':130 'request':39,65,168 'request/response':197 'requir':103 'return':181,209,214 'schema':195 'sentiment':137 'settl':68 'simpli':105 'spars':172 'specif':53 'summar':140 'text':139 'token':149 'unclear':224 'unit':84 'upfront':100 'usdc':15,30,70,90 'usdc-settlement' 'use':91 'util':155 'valid':114,157,216 'via':10,25,43 'wallet':185 'web3':144 'without':220 'x':109 'x-payment':108 'x402':11,26,45,115 'x402 API' 'x402-payment'","prices":[{"id":"1c29632b-ba30-41c5-820a-8afcbe50ad42","listingId":"b885e40c-03ba-41be-8756-975b1adde2d2","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/12","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:49:23.930Z"}],"sources":[{"listingId":"b885e40c-03ba-41be-8756-975b1adde2d2","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/payments/12","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:49:23.930Z","lastSeenAt":"2026-04-23T19:01:17.239Z"}],"details":{"listingId":"b885e40c-03ba-41be-8756-975b1adde2d2","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/payments/12 \\\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":"Endpoint returns a valid x402 402 challenge with maxAmountRequired of 20000 base units in USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/payments/12"},{"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 offers endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset contract is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base network","source_url":"https://lowpaymentfee.com/api/v1/payments/12"}],"useCases":["Programmatic access to premium API functionality with per-request USDC micropayments","Agent-driven workflows that need keyless, instant API access without subscriptions","Testing x402 payment protocol integrations on the Base network"],"bestFor":["Developers wanting zero-commitment, pay-as-you-go API access","AI agents that can settle x402 payments autonomously","Users who prefer crypto micropayments over traditional API key subscriptions"],"notFor":["Users who need detailed API documentation or response schemas before integrating","High-volume consumers who would benefit from bulk pricing or subscription plans","Anyone without a Base-compatible USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:09.991Z"},"updatedAt":"2026-04-23T19:01:17.239Z"}}