{"id":"fda7dbee-17e0-48cf-916b-9d0942c5c5fb","shortId":"bHH2mS","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 gated by the x402 payment protocol. This specific endpoint (`/api/v1/charges/5`) is labeled \"Premium API Access\" and accepts POST requests. Payment is settled on the Base network using USDC (contract 0x8335…2913) with a maximum charge of 20,000 base units, which equals $0.02 per request (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 endpoints are listed at the same $0.02/request price point.\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/charges/5` endpoint actually returns. The endpoint is confirmed live (returns a proper 402 x402 challenge), but without documentation it is unclear what data or functionality \"Premium API Access\" provides versus the other listed endpoints.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","pay-per-request","no-api-key","post-method"],"categories":["api-gateway","infrastructure"],"synonyms":["x402 API","pay-per-call API","USDC micropayment API","Base network API","lowpaymentfee","premium API access","crypto-paid API"],"warnings":["No documentation available — /docs, /pricing, /api, and /README all return only 'Connect wallet' with no content.","No OpenAPI or schema definition; request body format and response structure are unknown.","The purpose of /api/v1/charges/5 ('Premium API Access') is not explained anywhere — it is unclear what data or service it provides.","The broad list of advertised endpoints (AI, finance, analytics, etc.) cannot be verified as functional from the crawl data."],"endpointUrl":"https://lowpaymentfee.com/api/v1/charges/5","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/5","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 402 x402 challenge, and pricing is clear ($0.02 USDC on Base). However, there is no OpenAPI schema, no request/response examples, and all documentation pages are empty stubs. The actual functionality behind 'Premium API Access' is 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'/api/v1/charges/5':51,205 '/docs':173 '/pricing':174 '/readme':177 '/request':13,28,165 '0.02':12,27,84,164 '000':79 '0x8335':71 '20':78 '2913':72 '402':217 '6':89 'Base network API' 'USDC micropayment API' 'accept':58 'access':7,22,56,232 'across':121 'actual':207 'advertis':119 'ai':131 'analysi':135 'analyt':125 'api':6,21,40,55,92,231 'attach':103 'base':9,24,66,80 'base-network' 'broader':116 'call':4,19 'caller':101 'categori':123 'challeng':219 'charg':76 'classif':138 'collect':34 'commit':98 'confirm':212 'connect':183 'content':189 'contract':70 'convers':155 'crypto-paid API' 'data':124,128,227 'decim':90 'descript':201 'detail':200 'document':168,222 'embed':139 'endpoint':41,50,120,158,206,210,238 'equal':83 'estim':149 'exampl':197 'exchang':144 'export':129 'extrem':170 'feed':143 'financ':140 'four':122 'function':229 'gas':148 'gate':42 'generat':156 'geocod':153 'header':108 'host':32 'infrastructur':151 'insight':130 'key':93 'label':53 'learn':133 'limit':95 'list':160,237 'live':213 'lowpaymentfee' 'lowpaymentfee.com':31,117 'machin':132 'maximum':75 'metric':126 'network':67 'no-api-key' 'openapi':193 'page':178 'pay':2,17,37 'pay-per-cal':1,16 'pay-per-call API' 'pay-per-request':36 'payment':46,61,107,113 'per':3,18,38,85 'platform':118 'point':167 'post':59 'post-method' 'premium':5,20,54,230 'premium API access' 'price':142,166 'prompt':185 'proof':114 'proper':216 'protocol':47 'provid':233 'quot':147 'rate':94,145 'report':127 'request':39,60,86 'request/response':196 'requir':100 'return':180,208,214 'schema':194 'sentiment':134 'settl':63 'simpli':102 'spars':171 'specif':49 'summar':137 'text':136 'token':146 'unclear':225 'unit':81 'upfront':97 'usdc':15,30,69,87 'usdc-settlement' 'use':68,88 'util':152 'valid':111,154 'versus':234 'via':10,25 'wallet':184 'web3':141 'without':221 'x':106 'x-payment':105 'x402':11,26,45,112,218 'x402 API' 'x402-payment'","prices":[{"id":"201125be-f169-48e7-99fa-168f55cfd67f","listingId":"fda7dbee-17e0-48cf-916b-9d0942c5c5fb","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/5","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:45:20.516Z"}],"sources":[{"listingId":"fda7dbee-17e0-48cf-916b-9d0942c5c5fb","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/charges/5","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:45:20.516Z","lastSeenAt":"2026-04-23T23:02:31.290Z"}],"details":{"listingId":"fda7dbee-17e0-48cf-916b-9d0942c5c5fb","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/charges/5 \\\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 HTTP 402 with x402 challenge, confirming it is live","source_url":"https://lowpaymentfee.com/api/v1/charges/5"},{"claim":"Payment is 20,000 base units of USDC (0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base network, equaling $0.02","source_url":"https://lowpaymentfee.com/api/v1/charges/5"},{"claim":"Platform advertises $0.02/request pricing with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"Docs, pricing, API, and README pages all show only 'Connect wallet' with no further content","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Accessing premium API data without signing up for an account or obtaining API keys","Making one-off API calls with per-request USDC micropayments on Base","Agent-driven workflows that need instant, keyless API access with crypto settlement"],"bestFor":["Developers or agents who want zero-signup, pay-as-you-go API access","Use cases requiring micropayment-gated endpoints on Base L2","Callers who already hold USDC on Base and want frictionless API consumption"],"notFor":["Users who need detailed API documentation or guaranteed SLAs before integrating","High-volume consumers who would benefit from bulk pricing or subscription plans","Anyone without a Base-compatible wallet or USDC holdings"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:21.908Z"},"updatedAt":"2026-04-23T23:02:31.290Z"}}