{"id":"780714ea-1054-4e6a-9ca3-6e017eb523c1","shortId":"BpbTP5","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, payable in USDC on the Base network with no API keys, no rate limits, and no commitments required.\n\nThe specific endpoint `/api/v1/charges/141` is labeled \"Premium API Access\" and accepts POST requests. The x402 challenge advertises a maxAmountRequired of 20,000 base units of USDC (0x8335…2913 on Base), which equals $0.02 given USDC's 6 decimals. Payment is settled on-chain to the specified payTo address, with a 300-second timeout window. The response MIME type is 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 usage examples available. It is unclear what specific data or functionality the `/api/v1/charges/141` endpoint returns, as the site's landing page does not list this particular path among its catalog of named APIs. Users should expect to experiment or contact the provider for details.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","json-api","no-api-key","no-rate-limit"],"categories":["api-gateway","misc"],"synonyms":["low payment fee","x402 api","micropayment api","pay per call api","base usdc api","premium api access","lowpaymentfee"],"warnings":["No documentation available — /docs, /pricing, /api, and /README all render only 'Connect wallet'","The endpoint path /api/v1/charges/141 is not listed among the site's advertised API catalog; its specific functionality is unknown","No OpenAPI spec or request/response schema provided","No usage examples or sample responses available"],"endpointUrl":"https://lowpaymentfee.com/api/v1/charges/141","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/141","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 is operational. However, documentation is essentially nonexistent — all doc pages show only 'Connect wallet'. There is no OpenAPI spec, no request/response schema, no examples, and the specific endpoint path (/api/v1/charges/141) is not listed in the site's own catalog, making its purpose 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'/api/v1/charges/141':112,215 '/docs':175 '/pricing':176 '/readme':179 '/request':13,28 '0.02':12,27,88,141 '000':130 '0x8335':135 '20':129 '2913':136 '300':160 '6':145 'accept':119 'access':7,22,38,117 'address':157 'advertis':125 'ai/ml':59 'among':230 'analysi':62 'analyt':58 'api':6,21,37,55,100,116,235 'application/json':169 'avail':205 'base':9,24,96,131,138 'base usdc api' 'broad':48 'call':4,19 'catalog':49,232 'chain':152 'challeng':124 'classif':64 'commit':107 'connect':185 'contact':242 'content':191 'convers':81 'data':57,211 'decim':146 'detail':246 'document':170,200 'embed':65 'endpoint':32,84,111,216 'equal':140 'estim':75 'exampl':204 'exchang':70 'expect':238 'experi':240 'extrem':172 'feed':69 'financ':66 'function':213 'gas':74 'generat':82 'geocod':79 'given':142 'host':46 'infer':60 'infrastructur':77 'json-api' 'key':101 'label':114 'land':222 'limit':104 'list':226 'low payment fee' 'lowpaymentfee' 'lowpaymentfee.com':34 'maxamountrequir':127 'micropayment api' 'mime':166 'name':234 'network':97 'no-api-key' 'no-rate-limit' 'on-chain':150 'openapi':195 'page':180,223 'particular':228 'path':229 'pay':2,17,52 'pay per call api' 'pay-per-cal':1,16 'pay-per-request':51 'payabl':91 'payment':42,147 'payto':156 'per':3,18,53,89 'post':120 'premium':5,20,36,115 'premium api access' 'price':68,86 'prompt':187 'protocol':43 'provid':35,244 'quot':73 'rate':71,103 'render':182 'request':54,90,121 'request/response':198 'requir':108 'respons':165 'return':217 'schema':199 'second':161 'sentiment':61 'settl':149 'site':45,220 'span':56 'spars':173 'spec':196 'specif':110,210 'specifi':155 'summar':63 'timeout':162 'token':72 'type':167 'unclear':208 'unit':132 'usag':203 'usdc':15,30,93,134,143 'usdc-base' 'user':236 'util':78 'valid':80 'via':10,25,39 'wallet':186 'web3':67 'window':163 'x402':11,26,41,123 'x402 api' 'x402-payment'","prices":[{"id":"7398f1ce-896d-4eec-9fc6-26386e7ad23f","listingId":"780714ea-1054-4e6a-9ca3-6e017eb523c1","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/141","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:44:10.388Z"}],"sources":[{"listingId":"780714ea-1054-4e6a-9ca3-6e017eb523c1","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/charges/141","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:44:10.388Z","lastSeenAt":"2026-04-22T08:31:03.116Z"}],"details":{"listingId":"780714ea-1054-4e6a-9ca3-6e017eb523c1","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/charges/141 \\\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":"The x402 challenge advertises maxAmountRequired of 20000 base units of USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base with 300-second timeout","source_url":"https://lowpaymentfee.com/api/v1/charges/141"},{"claim":"Site catalog includes Data & Analytics, AI & ML, Finance & Web3, and Infrastructure API categories","source_url":"https://lowpaymentfee.com"},{"claim":"Documentation pages (/docs, /pricing, /api, /README) render only 'Connect wallet' with no further content","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Accessing pay-per-call API services without needing API keys or subscriptions","Making micropayment-gated HTTP requests settled in USDC on Base","Agent-driven programmatic access to premium data or utility endpoints"],"bestFor":["Developers wanting zero-commitment, pay-as-you-go API access","AI agents that can settle x402 payments autonomously on Base","Users who prefer on-chain micropayments over traditional billing"],"notFor":["Users who need detailed API documentation or OpenAPI specs before integrating","High-volume consumers who want bulk pricing or subscription discounts","Anyone without a Base-compatible wallet holding USDC"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:25.171Z"},"updatedAt":"2026-04-22T08:31:03.116Z"}}