{"id":"ab1dc0bc-30d9-48b0-850d-00a01464c015","shortId":"2JJvw4","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/205` 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 — each request is individually paid for via the X-PAYMENT header.\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 share the same $0.02/request pricing. However, the probed endpoint `/api/v1/payments/205` does not clearly map to any of these named services — its exact functionality beyond \"Premium API Access\" is not documented.\n\nDocumentation is extremely sparse. The /docs, /api, /pricing, and /README pages all render only a \"Connect wallet\" prompt with no further content. There is no OpenAPI spec, no request/response schema documentation, and no usage examples available from the crawl. The endpoint is confirmed live (returns a valid 402 x402 challenge), but what data or service it actually returns upon successful payment is unknown.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","pay-per-request","no-api-key","post-endpoint"],"categories":["api-gateway","payments"],"synonyms":["x402 API","micropayment API","pay-per-call","USDC API","Base network API","lowpaymentfee","crypto-paid API"],"warnings":["No documentation available — /docs, /api, /pricing, and /README all render only 'Connect wallet' with no content","The exact functionality of /api/v1/payments/205 ('Premium API Access') is not described anywhere; it does not map to any named endpoint on the homepage","No request body schema or response schema is documented","No OpenAPI or machine-readable API specification found"],"endpointUrl":"https://lowpaymentfee.com/api/v1/payments/205","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/205","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, confirming pricing and payment details. However, documentation is essentially nonexistent — no OpenAPI spec, no request/response schemas, no examples, and the actual functionality behind 'Premium API Access' is undefined. This is effectively a stub 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'/api/v1/payments/205':56,171 '/docs':197 '/pricing':199 '/readme':201 '/request':13,28,165 '0.02':12,27,87,164 '000':82 '0x8335':72 '20':81 '2913':73 '402':239 '6':92 'Base network API' 'USDC API' 'accept':63 'access':7,22,42,61,188 'across':122 'actual':248 'advertis':120 'ai':132 'amount':79 'analysi':136 'analyt':126 'api':6,21,40,60,95,187 'avail':227 'base':9,24,50,75,83 'base-network' 'beyond':185 'broader':117 'call':4,19,89 'categori':124 'challeng':241 'classif':139 'clear':174 'collect':34 'commit':101 'confirm':234 'connect':207 'content':213 'contract':71 'convers':156 'crawl':230 'crypto-paid API' 'data':125,129,244 'decim':93 'document':191,192,222 'embed':140 'endpoint':41,54,121,160,170,232 'equal':86 'estim':150 'exact':183 'exampl':226 'exchang':145 'export':130 'extrem':194 'feed':144 'financ':141 'four':123 'function':184 'gas':149 'generat':157 'geocod':154 'header':115 'host':32 'howev':167 'individu':107 'infrastructur':152 'insight':131 'key':96 'label':58 'learn':134 'limit':98 'list':159 'live':235 'lowpaymentfee' 'lowpaymentfee.com':31,118 'machin':133 'map':175 'maximum':78 'metric':127 'micropayment API' 'name':180 'network':51 'no-api-key' 'openapi':217 'page':202 'paid':108 'pay':2,17,37 'pay-per-cal':1,16 'pay-per-call' 'pay-per-request':36 'payment':46,66,114,252 'per':3,18,38,88 'platform':119 'post':64 'post-endpoint' 'premium':5,20,59,186 'price':143,166 'probe':169 'prompt':209 'protocol':47 'quot':148 'rate':97,146 'render':204 'report':128 'request':39,65,105 'request/response':220 'requir':103 'return':236,249 'schema':221 'sentiment':135 'servic':181,246 'settl':68 'share':161 'spars':195 'spec':218 'specif':53 'success':251 'summar':138 'text':137 'token':147 'unit':84 'unknown':254 'upfront':100 'upon':250 'usag':225 'usdc':15,30,70,90 'usdc-settlement' 'use':91 'util':153 'valid':155,238 'via':10,25,43,110 'wallet':208 'web3':142 'x':113 'x-payment':112 'x402':11,26,45,240 'x402 API' 'x402-payment'","prices":[{"id":"32e798b3-e20e-4dd2-9362-ebebf242a399","listingId":"ab1dc0bc-30d9-48b0-850d-00a01464c015","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/205","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:49:56.595Z"}],"sources":[{"listingId":"ab1dc0bc-30d9-48b0-850d-00a01464c015","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/payments/205","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:49:56.595Z","lastSeenAt":"2026-04-23T14:31:09.261Z"}],"details":{"listingId":"ab1dc0bc-30d9-48b0-850d-00a01464c015","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/payments/205 \\\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":"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/205"},{"claim":"USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/payments/205"},{"claim":"All listed endpoints priced at $0.02/request with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"Platform advertises endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Programmatic access to premium API services without API key management","Agent-driven pay-per-call workflows settled in USDC on Base","Exploring x402 protocol integration for micropayment-gated endpoints"],"bestFor":["Developers experimenting with x402 payment protocol","Agents that need keyless, pay-as-you-go API access on Base","Users who prefer crypto micropayments over subscription billing"],"notFor":["Users who need detailed API documentation or guaranteed SLAs","Anyone requiring non-crypto payment methods","Production workloads that depend on well-documented request/response contracts"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:08.477Z"},"updatedAt":"2026-04-23T14:31:09.261Z"}}