{"id":"bff9348c-67ad-4e15-b596-cc94e212105d","shortId":"LFmZaG","kind":"x402","title":"Pay-per-call API platform on Base with USDC payments via x402 — $0.02/request, no API keys required.","tagline":"Pay-per-call API platform on Base with USDC payments via x402 — $0.02/request, no API keys required.","description":"lowpaymentfee.com is an x402-enabled API platform that offers a variety of endpoints across data analytics, AI/ML inference, finance/Web3, and infrastructure utilities. All endpoints are pay-per-request using USDC on the Base network, settled via the x402 protocol. There are no API keys, no rate limits, and no minimum commitments — callers simply attach an x402 payment header to each request.\n\nThe specific endpoint at `/api/v1/policies/76` is listed as \"Premium API Access\" and requires a maximum of 20,000 base units of USDC (0.02 USDC, i.e., $0.02) per call. The platform also hosts endpoints for sentiment analysis, text summarization, classification, embeddings, price feeds, exchange rates, token quotes, gas estimates, geocoding, validation, conversion, and generation — all at the same $0.02 price point.\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 the \"Premium API Access\" policy/76 endpoint actually returns. Without additional documentation it is unclear what data or functionality this specific endpoint provides.","tags":[],"capabilities":["x402-payment","usdc-base-network","pay-per-request","no-api-key","no-rate-limits","json-response","http-post"],"categories":["api-platform","finance","ai-ml","data","infrastructure"],"synonyms":["x402 API","pay-per-call API","USDC API","Base network API","micropayment API","lowpaymentfee","low payment fee"],"warnings":["No OpenAPI or schema documentation available — all docs/pricing/README pages render only 'Connect wallet'","The purpose and expected input/output of /api/v1/policies/76 is completely undocumented","The platform lists many endpoints but provides no technical details for any of them"],"endpointUrl":"https://lowpaymentfee.com/api/v1/policies/76","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/policies/76","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 USDC payments on Base at $0.02/request. However, there is no OpenAPI schema, no request/response examples, and no documentation beyond a landing page listing endpoint names. The specific purpose of /api/v1/policies/76 ('Premium API Access') is entirely 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'/request':15,34 '0.02':14,33,124,127,159 '000':119 '20':118 'Base network API' 'USDC API' 'access':112,200 'across':53 'actual':203 'addit':206 'ai/ml':56 'also':132 'analysi':137 'analyt':55 'api':5,17,24,36,45,83,111,168,199 'attach':94 'base':8,27,73,120 'call':4,23,129 'caller':92 'classif':140 'commit':91 'connect':177 'content':183 'convers':152 'data':54,212 'descript':194 'doc':167 'document':162,207 'embed':141 'enabl':44 'endpoint':52,63,104,134,202,217 'estim':149 'exampl':191 'exchang':144 'extrem':164 'feed':143 'finance/web3':58 'function':214 'gas':148 'generat':154 'geocod':150 'header':98 'host':133 'http-post' 'i.e':126 'infer':57 'infrastructur':60 'json-response' 'key':18,37,84 'limit':87 'list':108 'low payment fee' 'lowpaymentfee' 'lowpaymentfee.com':39 'maximum':116 'micropayment API' 'minimum':90 'network':74 'no-api-key' 'no-rate-limits' 'offer':48 'openapi':187 'page':172 'pay':2,21,66 'pay-per-cal':1,20 'pay-per-call API' 'pay-per-request':65 'payment':11,30,97 'per':3,22,67,128 'platform':6,25,46,131 'point':161 'policy/76':201 'premium':110,198 'price':142,160,169 'prompt':179 'protocol':79 'provid':218 'quot':147 'rate':86,145 'readm':171 'render':174 'request':68,101 'request/response':190 'requir':19,38,114 'return':204 'schema':188 'sentiment':136 'settl':75 'simpli':93 'spars':165 'specif':103,216 'summar':139 'text':138 'token':146 'unclear':210 'unit':121 'usdc':10,29,70,123,125 'usdc-base-network' 'use':69 'util':61 'valid':151 'varieti':50 'via':12,31,76 'wallet':178 'without':205 'x402':13,32,43,78,96 'x402 API' 'x402-enabled':42 'x402-payment'","prices":[{"id":"2f90cb35-db0c-4935-95ba-6eb3ffb030f3","listingId":"bff9348c-67ad-4e15-b596-cc94e212105d","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/policies/76","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:52:02.664Z"}],"sources":[{"listingId":"bff9348c-67ad-4e15-b596-cc94e212105d","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/policies/76","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:52:02.664Z","lastSeenAt":"2026-04-24T01:02:35.918Z"}],"details":{"listingId":"bff9348c-67ad-4e15-b596-cc94e212105d","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/policies/76 \\\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 requiring USDC payment of 20000 base units (0.02 USDC) on Base network","source_url":"https://lowpaymentfee.com/api/v1/policies/76"},{"claim":"The platform advertises $0.02/request pricing with no API keys, no rate limits, and instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/policies/76"},{"claim":"Available API categories include Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure","source_url":"https://lowpaymentfee.com"}],"useCases":["Accessing premium API data without needing to register or manage API keys","Making one-off API calls with instant USDC micropayments on Base","Integrating pay-per-request endpoints into autonomous agent workflows"],"bestFor":["Developers who want zero-friction API access without subscriptions","AI agents that can settle x402 payments autonomously on Base","Projects needing low-cost, on-demand API calls without rate limits"],"notFor":["Users who need detailed API documentation or OpenAPI specs before integrating","High-volume consumers who prefer flat-rate or subscription pricing","Developers without access to USDC on the Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:02.354Z"},"updatedAt":"2026-04-24T01:02:35.918Z"}}