{"id":"2fc29d0f-df72-4230-b6fc-41bab99ec944","shortId":"h2PMjY","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 site hosts a broad catalog of pay-per-request 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/249` is labeled \"Premium API Access\" and accepts POST requests. The x402 challenge confirms it is live, requiring an exact payment of 20,000 base units of USDC (0x8335…2913 on Base, 6 decimals = $0.02) per call. There are no API keys, no rate limits, and no minimum commitments — access is granted purely through the x402 payment header.\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 detailed description of what the `/api/v1/payments/249` endpoint specifically returns. The site's landing page lists many endpoints but provides no technical documentation for any of them. Prospective users should be aware that the actual functionality behind this particular endpoint path is unclear from available materials.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","post-method","no-api-key","no-rate-limit"],"categories":["api-gateway","payments"],"synonyms":["low payment fee API","x402 API","USDC pay-per-call","Base network API","micropayment API","crypto API access"],"warnings":["No documentation available — all doc pages render only 'Connect wallet' with no content","The specific functionality of /api/v1/payments/249 ('Premium API Access') is not described anywhere","No OpenAPI schema, no request body schema, and no response examples are provided","The site lists many endpoints but none have technical documentation"],"endpointUrl":"https://lowpaymentfee.com/api/v1/payments/249","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/249","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 with clear pricing. However, there is no documentation, no OpenAPI schema, no request/response examples, and the actual functionality of /api/v1/payments/249 is entirely unclear. The docs pages are empty beyond a wallet-connect prompt. This is effectively a stub 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'/request':13,28 '0.02':12,27,88,135 '000':124 '0x8335':129 '20':123 '2913':130 '6':133 'Base network API' 'USDC pay-per-call' 'accept':108 'access':7,22,38,106,150 'actual':224 'ai/ml':59 'analysi':62 'analyt':58 'api':6,21,37,55,105,141,165 'avail':234 'awar':221 'base':9,24,96,125,132 'behind':226 'broad':48 'call':4,19,137 'catalog':49 'challeng':113 'classif':64 'commit':149 'confirm':114 'connect':174 'content':180 'convers':81 'crypto API access' 'data':57 'decim':134 'descript':192 'detail':191 'doc':164 'document':159,212 'embed':65 'endpoint':32,84,100,197,207,229 'estim':75 'exact':120 'exampl':188 'exchang':70 'extrem':161 'feed':69 'financ':66 'function':225 'gas':74 'generat':82 'geocod':79 'grant':152 'header':158 'host':46 'infer':60 'infrastructur':77 'key':142 'label':103 'land':203 'limit':145 'list':205 'live':117 'low payment fee API' 'lowpaymentfee.com':34 'mani':206 'materi':235 'micropayment API' 'minimum':148 'network':97 'no-api-key' 'no-rate-limit' 'openapi':184 'page':169,204 'particular':228 'path':230 'pay':2,17,52 'pay-per-cal':1,16 'pay-per-request':51 'payment':42,121,157 'per':3,18,53,89,136 'post':109 'post-method' 'premium':5,20,36,104 'price':68,86,166 'prompt':176 'prospect':217 'protocol':43 'provid':35,209 'pure':153 'quot':73 'rate':71,144 'readm':168 'render':171 'request':54,90,110 'request/response':187 'requir':118 'return':199 'schema':185 'sentiment':61 'settl':91 'site':45,201 'span':56 'spars':162 'specif':99,198 'summar':63 'technic':211 'token':72 'unclear':232 'unit':126 'usdc':15,30,93,128 'usdc-base' 'user':218 'util':78 'valid':80 'via':10,25,39 'wallet':175 'web3':67 'x402':11,26,41,112,156 'x402 API' 'x402-payment'","prices":[{"id":"b01fd3d6-9b0f-4e2c-932f-a14e6302e409","listingId":"2fc29d0f-df72-4230-b6fc-41bab99ec944","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/249","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:50:02.671Z"}],"sources":[{"listingId":"2fc29d0f-df72-4230-b6fc-41bab99ec944","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/payments/249","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:50:02.671Z","lastSeenAt":"2026-04-23T14:01:24.115Z"}],"details":{"listingId":"2fc29d0f-df72-4230-b6fc-41bab99ec944","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/payments/249 \\\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 x402 challenge with maxAmountRequired of 20000 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/payments/249"},{"claim":"All endpoints are 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":"The site offers APIs across Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Accessing premium API services with per-request USDC micropayments on Base","Agent-driven API consumption without pre-registration or API keys","Programmatic pay-as-you-go access to data, AI, finance, or utility endpoints"],"bestFor":["Developers wanting keyless, pay-per-call API access","AI agents that can settle x402 payments autonomously","Users who prefer crypto micropayments over subscription billing"],"notFor":["Users needing detailed API documentation or OpenAPI specs before integrating","High-volume consumers who want bulk pricing or subscription discounts","Anyone without a Base-compatible USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:08.185Z"},"updatedAt":"2026-04-23T14:01:24.115Z"}}