{"id":"5d9cba4d-eacd-4f85-89e3-c423f17b9695","shortId":"S8DfHk","kind":"x402","title":"Pay-per-call premium API access on Base via x402 — $0.02 per request in USDC.","tagline":"Pay-per-call premium API access on Base via x402 — $0.02 per request in USDC.","description":"This endpoint at lowpaymentfee.com provides \"Premium API Access\" via the x402 payment protocol. The site hosts a broad catalog of pay-per-call APIs spanning data & analytics, AI/ML inference (sentiment analysis, summarization, classification, embeddings), finance & Web3 (price feeds, exchange rates, token quotes, gas estimates), and infrastructure utilities (geocoding, validation, conversion, generation). All endpoints are priced at $0.02 per request, settled in USDC on the Base network.\n\nThe specific endpoint `/api/v1/payments/342` is labeled \"Premium API Access\" and accepts POST requests. The x402 challenge advertises a maxAmountRequired of 20,000 base units of USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913, which has 6 decimals), equating to $0.02 per call. Payment is made via the `exact` scheme with a 300-second timeout. No API keys or rate limits are required — callers simply attach the X-PAYMENT header with a valid x402 payment proof.\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 schema, no request/response examples, and no description of what this particular endpoint (`/payments/342`) actually returns or what input it expects beyond a POST body. The site's landing page lists many other endpoints but does not clarify the specific functionality behind this one. Prospective callers should be aware that the actual behavior of this endpoint is undocumented.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-call","no-api-key","post-endpoint","json-response"],"categories":["api-gateway","payments"],"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, API, pricing, and README pages all show only 'Connect wallet' with no content","No OpenAPI or schema describing request parameters or response format for /api/v1/payments/342","The specific functionality of this endpoint is completely undocumented; 'Premium API Access' is a generic label","Cannot verify what data or service is actually returned upon successful payment"],"endpointUrl":"https://lowpaymentfee.com/api/v1/payments/342","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/342","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 accepts payments. However, there is no documentation, no OpenAPI schema, no request/response examples, and no explanation of what this specific endpoint does beyond the generic label \"Premium API Access\". The docs pages are empty. This is effectively a stub 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'/payments/342':209 '0.02':12,28,90,134 '000':121 '0x833589fcd6edb6e08f4c7c32d4f71b54bda02913':127 '20':120 '300':146 '6':130 'Base network API' 'USDC micropayment API' 'accept':110 'access':7,23,40,108 'actual':210,247 'advertis':116 'ai/ml':61 'analysi':64 'analyt':60 'api':6,22,39,57,107,150,177 'asset':126 'attach':159 'awar':244 'base':9,25,98,122 'behavior':248 'behind':237 'beyond':217 'bodi':220 'broad':50 'call':4,20,56,136 'caller':157,241 'catalog':51 'challeng':115 'clarifi':233 'classif':66 'connect':186 'content':192 'convers':83 'crypto-paid API' 'data':59 'decim':131 'descript':203 'doc':176 'document':171 'embed':67 'endpoint':34,86,102,208,229,251 'equat':132 'estim':77 'exact':142 'exampl':200 'exchang':72 'expect':216 'extrem':173 'feed':71 'financ':68 'function':236 'gas':76 'generat':84 'geocod':81 'header':164 'host':48 'infer':62 'infrastructur':79 'input':214 'json-response' 'key':151 'label':105 'land':224 'limit':154 'list':226 'lowpaymentfee' 'lowpaymentfee.com':36 'made':139 'mani':227 'maxamountrequir':118 'network':99 'no-api-key' 'one':239 'openapi':196 'page':181,225 'particular':207 'pay':2,18,54 'pay-per-cal':1,17,53 'pay-per-call' 'pay-per-request API' 'payment':44,137,163,169 'per':3,13,19,29,55,91,135 'post':111,219 'post-endpoint' 'premium':5,21,38,106 'premium API access' 'price':70,88,178 'prompt':188 'proof':170 'prospect':240 'protocol':45 'provid':37 'quot':75 'rate':73,153 'readm':180 'render':183 'request':14,30,92,112 'request/response':199 'requir':156 'return':211 'schema':197 'scheme':143 'second':147 'sentiment':63 'settl':93 'simpli':158 'site':47,222 'span':58 'spars':174 'specif':101,235 'summar':65 'timeout':148 'token':74 'undocu':253 'unit':123 'usdc':16,32,95,125 'usdc-base' 'util':80 'valid':82,167 'via':10,26,41,140 'wallet':187 'web3':69 'x':162 'x-payment':161 'x402':11,27,43,114,168 'x402 API' 'x402-payment'","prices":[{"id":"9bb0b836-a803-49c1-ae4e-f7ed7f37e54d","listingId":"5d9cba4d-eacd-4f85-89e3-c423f17b9695","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/342","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:50:27.749Z"}],"sources":[{"listingId":"5d9cba4d-eacd-4f85-89e3-c423f17b9695","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/payments/342","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:50:27.749Z","lastSeenAt":"2026-04-23T11:03:34.955Z"}],"details":{"listingId":"5d9cba4d-eacd-4f85-89e3-c423f17b9695","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/payments/342 \\\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":"All endpoints priced at $0.02 per request with no API keys, no rate limits, and instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"x402 challenge returns maxAmountRequired of 20000 base units of USDC (USD Coin) on Base with exact scheme and 300s timeout","source_url":"https://lowpaymentfee.com/api/v1/payments/342"},{"claim":"USDC asset address is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/payments/342"},{"claim":"Site lists APIs across data & analytics, AI/ML, finance & Web3, and infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Programmatic access to a pay-per-call API without needing API keys or subscriptions","Agent-driven workflows that settle per-request costs in USDC on Base","Testing x402 payment protocol integrations with a low-cost endpoint"],"bestFor":["Developers experimenting with x402 payment flows","AI agents that need keyless, pay-as-you-go API access","Low-volume callers who prefer per-request billing over subscriptions"],"notFor":["Users who need detailed API documentation or guaranteed SLAs","High-volume production workloads where $0.02/request adds up quickly","Callers who cannot transact in USDC on the Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:07.022Z"},"updatedAt":"2026-04-23T11:03:34.955Z"}}