{"id":"67bd3317-42d4-4286-88d7-23892f07a5a2","shortId":"dNDDqJ","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":"This endpoint at lowpaymentfee.com provides \"Premium API Access\" via the x402 payment protocol. The specific resource at `/api/v1/charges/313` accepts POST requests and charges up to 20,000 base units of USDC (0x8335…2913) on the Base network, which equals $0.02 per request (USDC uses 6 decimals). Payment is handled inline via the X-PAYMENT header with no API keys or accounts required.\n\nThe broader lowpaymentfee.com platform advertises a suite of pay-per-call APIs 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 $0.02 per request with no rate limits or minimum commitments.\n\nHowever, the specific endpoint `/api/v1/charges/313` is labeled only as \"Premium API Access\" with no further documentation about what data or functionality it returns. The docs, pricing, and API pages on the site render only a \"Connect wallet\" prompt with no additional technical detail. Without an OpenAPI schema, example responses, or detailed documentation, it is unclear what payload this particular endpoint expects or returns.","tags":[],"capabilities":["x402-payment","pay-per-call","usdc-base","no-api-key","post-endpoint","json-response"],"categories":["api","infrastructure"],"synonyms":["x402 API","pay-per-request API","USDC micropayment API","Base network API","lowpaymentfee","premium API access","crypto-paid API"],"warnings":["No documentation available — docs, pricing, API, and README pages all render only 'Connect wallet'","The specific functionality of /api/v1/charges/313 is unknown; 'Premium API Access' is the only description","No OpenAPI schema or example responses provided","No input schema documented — unclear what POST body is expected","The site lists many endpoints but none have detailed docs; actual availability and functionality are unverified"],"endpointUrl":"https://lowpaymentfee.com/api/v1/charges/313","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/313","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 it works. However, there is no OpenAPI schema, no example request/response, and the docs pages are empty (just 'Connect wallet'). The specific functionality behind '/api/v1/charges/313' is undocumented beyond the generic label 'Premium API Access'. This is effectively a stub 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'/request':13,28 '0.02':12,27,70,148 '000':57 '0x8335':62 '20':56 '2913':63 '6':75 'Base network API' 'USDC micropayment API' 'accept':49 'access':7,22,38,169 'account':92 'across':107 'addit':198 'advertis':98 'ai':117 'analysi':121 'analyt':111 'api':6,21,37,89,106,168,185 'base':9,24,58,66 'broader':95 'call':4,19,105 'categori':109 'charg':53 'classif':124 'commit':157 'connect':193 'convers':141 'crypto-paid API' 'data':110,114,176 'decim':76 'detail':200,208 'doc':182 'document':173,209 'embed':125 'endpoint':32,144,161,217 'equal':69 'estim':135 'exampl':205 'exchang':130 'expect':218 'export':115 'feed':129 'financ':126 'four':108 'function':178 'gas':134 'generat':142 'geocod':139 'handl':79 'header':86 'howev':158 'infrastructur':137 'inlin':80 'insight':116 'json-response' 'key':90 'label':164 'learn':119 'limit':154 'list':146 'lowpaymentfee' 'lowpaymentfee.com':34,96 'machin':118 'metric':112 'minimum':156 'network':67 'no-api-key' 'openapi':203 'page':186 'particular':216 'pay':2,17,103 'pay-per-cal':1,16,102 'pay-per-call' 'pay-per-request API' 'payload':214 'payment':42,77,85 'per':3,18,71,104,149 'platform':97 'post':50 'post-endpoint' 'premium':5,20,36,167 'premium API access' 'price':128,183 'prompt':195 'protocol':43 'provid':35 'quot':133 'rate':131,153 'render':190 'report':113 'request':51,72,150 'requir':93 'resourc':46 'respons':206 'return':180,220 'schema':204 'sentiment':120 'site':189 'specif':45,160 'suit':100 'summar':123 'technic':199 'text':122 'token':132 'unclear':212 'unit':59 'usdc':15,30,61,73 'usdc-base' 'use':74 'util':138 'valid':140 'via':10,25,39,81 'wallet':194 'web3':127 'without':201 'x':84 'x-payment':83 'x402':11,26,41 'x402 API' 'x402-payment'","prices":[{"id":"9c1d740f-17d8-4486-bf0d-044ffa5cf6f3","listingId":"67bd3317-42d4-4286-88d7-23892f07a5a2","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/313","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:45:04.271Z"}],"sources":[{"listingId":"67bd3317-42d4-4286-88d7-23892f07a5a2","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/charges/313","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:45:04.271Z","lastSeenAt":"2026-04-22T12:03:41.395Z"}],"details":{"listingId":"67bd3317-42d4-4286-88d7-23892f07a5a2","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/charges/313 \\\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 402 challenge requesting up to 20,000 base units of USDC on Base network","source_url":"https://lowpaymentfee.com/api/v1/charges/313"},{"claim":"USDC asset address is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/charges/313"},{"claim":"All endpoints are priced at $0.02 per request with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"The platform offers APIs across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"},{"claim":"Docs, pricing, API, and README pages render only 'Connect wallet' with no additional content","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Programmatic access to a premium API resource without needing API keys or accounts","Agent-driven workflows that pay per call using USDC on Base","Testing x402 payment protocol integrations against a live endpoint"],"bestFor":["Developers experimenting with x402 payment-gated APIs","AI agents that can settle USDC payments on Base automatically","Users who want pay-as-you-go access without subscriptions"],"notFor":["Users who need detailed API documentation or guaranteed SLAs before integrating","Anyone without a Base-compatible USDC wallet","High-volume batch processing where per-call pricing may add up"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:22.611Z"},"updatedAt":"2026-04-22T12:03:41.395Z"}}