{"id":"c80ba901-6716-4175-a61a-65cb8871cd60","shortId":"X8PAMN","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 (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/286` is listed as \"Premium API Access\" with a maximum charge of 20,000 base units of USDC (0.02 USDC = $0.02). Payment is handled via the x402 exact scheme: callers attach an X-PAYMENT header with a signed payment to the payTo address. There are no API keys, no rate limits, and no minimum commitments — access is instant once payment is included.\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 this particular endpoint returns. The endpoint is confirmed live (returns a proper 402 challenge), but without documentation it is unclear what data or functionality \"Premium API Access\" at path `/payments/286` actually provides. The site's landing page lists many other endpoints by category, but this specific path does not appear among them, making its purpose ambiguous.","tags":[],"capabilities":["x402-payment","usdc-base-network","pay-per-request","no-api-key","no-rate-limit","http-post"],"categories":["api-gateway","payments"],"synonyms":["lowpaymentfee","x402 api","pay per call api","usdc api access","base network api","micropayment api","crypto api payment"],"warnings":["No documentation available — docs, API, pricing, and README pages all show only 'Connect wallet'","No OpenAPI or schema describing request parameters or response format","The specific endpoint /api/v1/payments/286 ('Premium API Access') does not appear in the site's listed API catalog, making its function unknown","Cannot verify what data or service this endpoint actually returns"],"endpointUrl":"https://lowpaymentfee.com/api/v1/payments/286","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/286","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.250","qualityRationale":"The endpoint is confirmed live with a valid x402 402 challenge, but there is no documentation, no OpenAPI schema, no request/response examples, and the specific purpose of /api/v1/payments/286 is unclear. The docs pages are empty beyond a wallet-connect prompt. This is effectively a stub 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'/payments/286':228 '/request':13,28 '0.02':12,27,87,118,120 '000':113 '20':112 '402':211 'access':7,22,38,106,156,225 'actual':229 'address':143 'ai/ml':59 'ambigu':254 'among':249 'analysi':61 'analyt':58 'api':6,21,37,55,105,147,169,224 'appear':248 'attach':130 'base':9,24,95,114 'base network api' 'broad':48 'call':4,19 'caller':129 'catalog':49 'categori':241 'challeng':212 'charg':110 'classif':63 'commit':155 'confirm':206 'connect':178 'content':184 'convers':80 'crypto api payment' 'data':57,220 'descript':196 'detail':195 'doc':168 'document':163,215 'embed':64 'endpoint':32,83,99,201,204,239 'estim':74 'exact':127 'exampl':192 'exchang':69 'extrem':165 'feed':68 'financ':65 'function':222 'gas':73 'generat':81 'geocod':78 'handl':123 'header':135 'host':46 'http-post' 'includ':162 'infrastructur':76 'instant':158 'key':148 'land':234 'limit':151 'list':102,236 'live':207 'lowpaymentfee' 'lowpaymentfee.com':34 'make':251 'mani':237 'maximum':109 'micropayment api' 'minimum':154 'network':96 'no-api-key' 'no-rate-limit' 'openapi':188 'page':173,235 'particular':200 'path':227,245 'pay':2,17,52 'pay per call api' 'pay-per-cal':1,16 'pay-per-request':51 'payment':42,121,134,139,160 'payto':142 'per':3,18,53,88 'premium':5,20,36,104,223 'price':67,85,170 'prompt':180 'proper':210 'protocol':43 'provid':35,230 'purpos':253 'quot':72 'rate':70,150 'readm':172 'render':175 'request':54,89 'request/response':191 'return':202,208 'schema':189 'scheme':128 'sentiment':60 'settl':90 'sign':138 'site':45,232 'span':56 'spars':166 'specif':98,244 'summar':62 'token':71 'unclear':218 'unit':115 'usdc':15,30,92,117,119 'usdc api access' 'usdc-base-network' 'util':77 'valid':79 'via':10,25,39,124 'wallet':179 'web3':66 'without':214 'x':133 'x-payment':132 'x402':11,26,41,126 'x402 api' 'x402-payment'","prices":[{"id":"96a54679-89c7-45ec-b249-fb594a85dc77","listingId":"c80ba901-6716-4175-a61a-65cb8871cd60","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/286","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:50:16.228Z"}],"sources":[{"listingId":"c80ba901-6716-4175-a61a-65cb8871cd60","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/payments/286","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:50:16.228Z","lastSeenAt":"2026-04-23T12:31:28.172Z"}],"details":{"listingId":"c80ba901-6716-4175-a61a-65cb8871cd60","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/payments/286 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <signed-x402-payment-header>\"","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, 6 decimals = $0.02) on Base network","source_url":"https://lowpaymentfee.com/api/v1/payments/286"},{"claim":"Site lists APIs across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"},{"claim":"Docs, API, pricing, and README pages render only 'Connect wallet' with no further content","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Programmatic access to premium API functionality paid per-call in USDC on Base","Agent-driven workflows that need keyless, instant API access without subscriptions","Integrating pay-as-you-go API calls into Web3 applications"],"bestFor":["Developers wanting zero-commitment, per-request API billing","AI agents that can settle x402 payments autonomously","Users already holding USDC on Base who want frictionless API access"],"notFor":["Users who need detailed API documentation or OpenAPI specs before integrating","High-volume consumers who would benefit from bulk pricing or subscriptions","Anyone without a Base-compatible wallet or USDC holdings"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:07.638Z"},"updatedAt":"2026-04-23T12:31:28.172Z"}}