{"id":"e012bd6a-4c17-452d-a9bd-abd8ea085d98","shortId":"ynWAgX","kind":"x402","title":"Pay-per-call premium API on Base via x402 — $0.02/request in USDC, no API keys required.","tagline":"Pay-per-call premium API on Base via x402 — $0.02/request in USDC, no API keys required.","description":"lowpaymentfee.com hosts a collection of pay-per-request API endpoints accessible via the x402 payment protocol on the Base network. This specific endpoint (`/api/endpoint-49`) is labeled \"Premium API Access\" and accepts POST requests. Payment is settled in USDC (contract 0x8335…2913 on Base) at a maximum cost of $0.02 per call (20,000 base units with 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 share the same $0.02/request pricing. However, this particular endpoint path (`/api/endpoint-49`) does not correspond to any of the named endpoints on the site's landing page, so its exact functionality is unclear.\n\nThe endpoint is live and returns a well-formed x402 challenge (version 1, scheme \"exact\"). Documentation beyond the landing page is effectively empty — the docs, API, pricing, and README pages all render only a \"Connect wallet\" prompt with no additional content. Without an OpenAPI spec, request/response examples, or detailed documentation, the actual input format and output data of this endpoint remain unknown.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","pay-per-request","no-api-key","http-post"],"categories":["api","payments"],"synonyms":["x402 API","pay-per-call API","USDC micropayment endpoint","Base network API","lowpaymentfee","premium API access","crypto-paid API"],"warnings":["Endpoint path /api/endpoint-49 does not match any named endpoint on the provider's landing page — its actual functionality is unclear.","Documentation pages (docs, API, pricing, README) are effectively empty, showing only 'Connect wallet'.","No OpenAPI schema or request/response examples are available.","No way to verify what data or service this endpoint actually provides before paying."],"endpointUrl":"https://lowpaymentfee.com/api/endpoint-49","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/endpoint-49","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 challenge, but there is no OpenAPI spec, no documentation, no request/response examples, and the endpoint path does not match any named service on the landing page. The actual functionality of /api/endpoint-49 is 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'/request':12,30,169 '0.02':11,29,86,168 '000':90 '0x8335':77 '1':211 '20':89 '2913':78 '6':94 'Base network API' 'USDC micropayment endpoint' 'accept':68 'access':48,66 'across':126 'actual':250 'addit':238 'advertis':124 'ai':136 'analysi':140 'analyt':130 'api':6,16,24,34,46,65,97,224 'attach':108 'base':8,26,56,80,91 'base-network' 'beyond':215 'broader':121 'call':4,22,88 'caller':106 'categori':128 'challeng':209 'classif':143 'collect':40 'commit':103 'connect':233 'content':239 'contract':76 'convers':160 'correspond':179 'cost':84 'crypto-paid API' 'data':129,133,255 'decim':95 'detail':247 'doc':223 'document':214,248 'effect':220 'embed':144 'empti':221 'endpoint':47,60,125,164,174,185,199,258 'estim':154 'exact':194,213 'exampl':245 'exchang':149 'export':134 'feed':148 'financ':145 'form':207 'format':252 'four':127 'function':195 'gas':153 'generat':161 'geocod':158 'header':113 'host':38 'howev':171 'http-post' 'infrastructur':156 'input':251 'insight':135 'key':17,35,98 'label':63 'land':190,217 'learn':138 'limit':100 'list':163 'live':201 'lowpaymentfee' 'lowpaymentfee.com':37,122 'machin':137 'maximum':83 'metric':131 'name':184 'network':57 'no-api-key' 'openapi':242 'output':254 'page':191,218,228 'particular':173 'path':175 'pay':2,20,43 'pay-per-cal':1,19 'pay-per-call API' 'pay-per-request':42 'payment':52,71,112,118 'per':3,21,44,87 'platform':123 'post':69 'premium':5,23,64 'premium API access' 'price':147,170,225 'prompt':235 'proof':119 'protocol':53 'quot':152 'rate':99,150 'readm':227 'remain':259 'render':230 'report':132 'request':45,70 'request/response':244 'requir':18,36,105 'return':203 'scheme':212 'sentiment':139 'settl':73 'share':165 'simpli':107 'site':188 'spec':243 'specif':59 'summar':142 'text':141 'token':151 'unclear':197 'unit':92 'unknown':260 'upfront':102 'usdc':14,32,75 'usdc-settlement' 'util':157 'valid':116,159 'version':210 'via':9,27,49 'wallet':234 'web3':146 'well':206 'well-form':205 'without':240 'x':111 'x-payment':110 'x402':10,28,51,117,208 'x402 API' 'x402-payment'","prices":[{"id":"187cfe80-4956-4511-955c-de4dfa4fec93","listingId":"e012bd6a-4c17-452d-a9bd-abd8ea085d98","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/endpoint-49","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:38:11.593Z"}],"sources":[{"listingId":"e012bd6a-4c17-452d-a9bd-abd8ea085d98","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/endpoint-49","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:38:11.593Z","lastSeenAt":"2026-04-22T21:30:34.780Z"}],"details":{"listingId":"e012bd6a-4c17-452d-a9bd-abd8ea085d98","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/endpoint-49 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-proof>\" \\\n  -d '{}'","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"The endpoint returns a valid x402 challenge with maxAmountRequired of 20000 in USDC on Base","source_url":"https://lowpaymentfee.com/api/endpoint-49"},{"claim":"All listed endpoints are priced at $0.02/request with no API keys, no rate limits, and instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"The platform advertises endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset contract is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/endpoint-49"}],"useCases":["Agent-driven API consumption with automatic per-call USDC payments","Accessing premium data or services without managing API keys or subscriptions","Programmatic pay-as-you-go access to utility endpoints on Base"],"bestFor":["Developers or agents wanting zero-signup, pay-per-use API access","x402-compatible clients settling micropayments in USDC on Base","Use cases where avoiding API key management and rate limits is valuable"],"notFor":["Users who need detailed documentation or guaranteed SLAs before integrating","High-volume consumers who need bulk/subscription pricing","Anyone without a Base-compatible USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:42.683Z"},"updatedAt":"2026-04-22T21:30:34.780Z"}}