{"id":"5518a905-25cd-426d-af67-f39bdce6a030","shortId":"GgHEph","kind":"x402","title":"Premium API access via x402 micropayment on Base — $0.02 per request in USDC.","tagline":"Premium API access via x402 micropayment on Base — $0.02 per request in USDC.","description":"This endpoint at lowpaymentfee.com provides \"Premium API Access\" gated by the x402 payment protocol. The site advertises a broad suite of API categories including 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). Each endpoint is priced at $0.02 per request, payable in USDC on the Base network with no API keys, no rate limits, and no commitments required.\n\nThe specific endpoint `/api/v1/apikeys/57` is described simply as \"Premium API Access\" and returns a live x402 challenge requesting up to 20,000 base units of USDC (0x8335…2913 on Base), which equals $0.02 given USDC's 6 decimals. Payment is made via the x402 exact scheme to wallet 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3 with a 300-second timeout. The response MIME type is application/json and the input method is HTTP POST.\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 examples of what the endpoint actually returns. The exact purpose of the `/api/v1/apikeys/57` path (as opposed to the other listed endpoints) is unclear; it may provision or retrieve an API key. Without documentation, the actual functionality behind this specific endpoint cannot be confirmed.","tags":[],"capabilities":["x402-payment","usdc-base","micropayment","pay-per-request","json-response","http-post"],"categories":["api-access","infrastructure"],"synonyms":["x402 API","micropayment API","pay-per-call API","USDC API access","Base network API","lowpaymentfee","premium API key"],"warnings":["No documentation available — /docs, /pricing, /api, and /README pages all render only 'Connect wallet'","No OpenAPI or schema definition found for any endpoint","The exact functionality of /api/v1/apikeys/57 is unclear; it may differ from the other advertised API categories","No example requests or responses are available to verify endpoint behavior"],"endpointUrl":"https://lowpaymentfee.com/api/v1/apikeys/57","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/apikeys/57","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 documentation is essentially nonexistent — all doc pages show only 'Connect wallet'. There is no OpenAPI spec, no request/response schema, and no explanation of what this specific endpoint returns. The purpose of '/api/v1/apikeys/57' is 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'/api/v1/apikeys/57':113,222 '/docs':182 '/pricing':184 '/readme':186 '0.02':9,22,89,142 '000':131 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':158 '0x8335':136 '20':130 '2913':137 '300':161 '6':146 'Base network API' 'USDC API access' 'access':3,16,34,120 'actual':215,244 'advertis':43 'ai':58 'analysi':62 'analyt':52 'api':2,15,33,48,101,119,239 'application/json':169 'base':8,21,97,132,139 'behind':246 'broad':45 'cannot':250 'categori':49 'challeng':126 'classif':65 'commit':108 'confirm':252 'connect':192 'content':198 'convers':82 'data':51,55 'decim':147 'describ':115 'document':177,207,242 'embed':66 'endpoint':28,85,112,214,230,249 'equal':141 'estim':76 'exact':154,218 'exampl':210 'exchang':71 'export':56 'extrem':179 'feed':70 'financ':67 'function':245 'gas':75 'gate':35 'generat':83 'geocod':80 'given':143 'http':175 'http-post' 'includ':50 'infrastructur':78 'input':172 'insight':57 'json-response' 'key':102,240 'learn':60 'limit':105 'list':229 'live':124 'lowpaymentfee' 'lowpaymentfee.com':30 'machin':59 'made':150 'may':234 'method':173 'metric':53 'micropay':6,19 'micropayment' 'micropayment API' 'mime':166 'network':98 'openapi':202 'oppos':225 'page':187 'path':223 'pay-per-call API' 'pay-per-request' 'payabl':92 'payment':39,148 'per':10,23,90 'post':176 'premium':1,14,32,118 'premium API key' 'price':69,87 'prompt':194 'protocol':40 'provid':31 'provis':235 'purpos':219 'quot':74 'rate':72,104 'render':189 'report':54 'request':11,24,91,127 'request/response':205 'requir':109 'respons':165 'retriev':237 'return':122,216 'schema':206 'scheme':155 'second':162 'sentiment':61 'simpli':116 'site':42 'spars':180 'spec':203 'specif':111,248 'suit':46 'summar':64 'text':63 'timeout':163 'token':73 'type':167 'unclear':232 'unit':133 'usdc':13,26,94,135,144 'usdc-base' 'util':79 'valid':81 'via':4,17,151 'wallet':157,193 'web3':68 'without':241 'x402':5,18,38,125,153 'x402 API' 'x402-payment'","prices":[{"id":"a269bf0a-c228-461c-aaaf-0b7b0331ff61","listingId":"5518a905-25cd-426d-af67-f39bdce6a030","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/apikeys/57","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T19:29:40.949Z"}],"sources":[{"listingId":"5518a905-25cd-426d-af67-f39bdce6a030","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/apikeys/57","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T19:29:40.949Z","lastSeenAt":"2026-04-23T05:01:54.977Z"}],"details":{"listingId":"5518a905-25cd-426d-af67-f39bdce6a030","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/apikeys/57 \\\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 live x402 challenge with maxAmountRequired of 20000 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/apikeys/57"},{"claim":"The site advertises APIs across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories, each at $0.02 per request","source_url":"https://lowpaymentfee.com"},{"claim":"Pricing is $0.02 per request with no API keys, no rate limits, and instant access on the Base network","source_url":"https://lowpaymentfee.com"},{"claim":"Documentation pages (/docs, /api, /pricing, /README) render only 'Connect wallet' with no further content","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Programmatic access to premium API endpoints without traditional API key management","Agent-driven pay-per-request API consumption settled in USDC on Base","Accessing data, AI, finance, or utility APIs with no subscription commitment"],"bestFor":["Agents or developers wanting zero-signup, pay-per-call API access","Users who prefer crypto micropayments over traditional billing","Low-volume or sporadic API consumers who don't want subscriptions"],"notFor":["Users needing detailed API documentation or guaranteed SLAs before purchasing","High-volume consumers who would benefit from bulk pricing or rate-limited plans","Users without access to USDC on the Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:28.614Z"},"updatedAt":"2026-04-23T05:01:54.977Z"}}