{"id":"df96a44c-c6bf-494d-a9c4-821bfb025ecb","shortId":"kc5SeH","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-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, payable in USDC on the Base network with no API keys, no rate limits, and no minimum commitments.\n\nThe specific endpoint `/api/v1/payments/382` is listed as \"Premium API Access\" and returns a valid x402 challenge with a maxAmountRequired of 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, settling to the specified payTo address. The endpoint accepts POST requests and returns application/json.\n\nDocumentation is extremely sparse — the /docs, /pricing, /api, 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 this particular endpoint actually returns. The site's landing page lists many API paths but does not describe request parameters or response formats for any of them. Without documentation, it is unclear what data or functionality the `/api/v1/payments/382` path specifically provides, as it does not match any of the named endpoints on the homepage.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-call","no-api-key","json-response","post-method"],"categories":["api-gateway","payments"],"synonyms":["x402 API","pay-per-request API","USDC micropayment API","Base network API","lowpaymentfee","crypto pay-per-call"],"warnings":["No documentation available — /docs, /pricing, /api, and /README all render only 'Connect wallet'","The path /api/v1/payments/382 does not match any of the named API endpoints listed on the homepage; its actual functionality is unknown","No OpenAPI spec, no request schema, no response schema, and no usage examples are provided","Cannot verify what data or service this endpoint actually delivers"],"endpointUrl":"https://lowpaymentfee.com/api/v1/payments/382","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/382","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, confirming pricing and payment details. However, documentation is essentially nonexistent — all doc pages show only 'Connect wallet'. The specific path /api/v1/payments/382 does not correspond to any named endpoint on the homepage, and there is no schema, no request/response examples, and no description of what the endpoint actually does. This is effectively a stub 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'/api/v1/payments/382':112,242 '/docs':174 '/pricing':175 '/readme':178 '/request':13,28 '0.02':12,27,88,141 '000':130 '0x8335':135 '20':129 '2913':136 '6':145 'Base network API' 'USDC micropayment API' 'accept':163 'access':7,22,38,118 'actual':208 'address':160 'ai/ml':59 'analysi':62 'analyt':58 'api':6,21,37,55,100,117,217 'application/json':168 'base':9,24,96,131,138 'broad':48 'call':4,19,54 'catalog':49 'challeng':124 'classif':64 'commit':108 'connect':184 'content':190 'convers':81 'crypto pay-per-call' 'data':57,238 'decim':146 'describ':222 'document':169,199,233 'embed':65 'endpoint':32,84,111,162,207,255 'equal':140 'estim':75 'exact':153 'exampl':202 'exchang':70 'extrem':171 'feed':69 'financ':66 'format':227 'function':240 'gas':74 'generat':82 'geocod':79 'given':142 'homepag':258 'host':46 'infer':60 'infrastructur':77 'json-response' 'key':101 'land':213 'limit':104 'list':114,215 'lowpaymentfee' 'lowpaymentfee.com':34 'made':149 'mani':216 'match':250 'maxamountrequir':127 'minimum':107 'name':254 'network':97 'no-api-key' 'openapi':194 'page':179,214 'paramet':224 'particular':206 'path':218,243 'pay':2,17,52 'pay-per-cal':1,16,51 'pay-per-call' 'pay-per-request API' 'payabl':91 'payment':42,147 'payto':159 'per':3,18,53,89 'post':164 'post-method' 'premium':5,20,36,116 'price':68,86 'prompt':186 'protocol':43 'provid':35,245 'quot':73 'rate':71,103 'render':181 'request':90,165,223 'request/response':197 'respons':226 'return':120,167,209 'schema':198 'scheme':154 'sentiment':61 'settl':155 'site':45,211 'span':56 'spars':172 'spec':195 'specif':110,244 'specifi':158 'summar':63 'token':72 'unclear':236 'unit':132 'usdc':15,30,93,134,143 'usdc-base' 'util':78 'valid':80,122 'via':10,25,39,150 'wallet':185 'web3':67 'without':232 'x402':11,26,41,123,152 'x402 API' 'x402-payment'","prices":[{"id":"e8ecbb20-782a-40c6-a9c9-3d7f630eeeb1","listingId":"df96a44c-c6bf-494d-a9c4-821bfb025ecb","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/382","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:50:41.077Z"}],"sources":[{"listingId":"df96a44c-c6bf-494d-a9c4-821bfb025ecb","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/payments/382","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:50:41.077Z","lastSeenAt":"2026-04-23T11:03:35.507Z"}],"details":{"listingId":"df96a44c-c6bf-494d-a9c4-821bfb025ecb","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/payments/382 \\\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":"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 (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base","source_url":"https://lowpaymentfee.com/api/v1/payments/382"},{"claim":"Site lists APIs across data & analytics, AI/ML, finance & Web3, and infrastructure categories","source_url":"https://lowpaymentfee.com"},{"claim":"Documentation pages (/docs, /pricing, /api, /README) render only 'Connect wallet'","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Agent-driven API consumption with automatic per-call USDC payments","Accessing premium data or services without traditional API key registration","Programmatic pay-as-you-go access to analytics, AI, finance, or utility endpoints"],"bestFor":["Developers or agents wanting zero-signup, pay-per-call API access","Use cases requiring micropayments on Base L2 in USDC","Scenarios where no rate limits and instant access are preferred over subscription plans"],"notFor":["Users who need detailed API documentation or guaranteed SLAs before integrating","Applications requiring non-crypto payment methods","High-volume use cases where per-call pricing may be more expensive than bulk subscriptions"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:06.353Z"},"updatedAt":"2026-04-23T11:03:35.507Z"}}