{"id":"a87e95ff-e862-45c9-b386-1d2d73f91d87","shortId":"R2V76T","kind":"x402","title":"x402-gated API platform on Base offering data, AI, finance, and utility endpoints at $0.02/request via USDC.","tagline":"x402-gated API platform on Base offering data, AI, finance, and utility endpoints at $0.02/request via USDC.","description":"lowpaymentfee.com is an x402 payment-gated API platform that hosts a collection of endpoints spanning data analytics, AI/ML inference, finance/Web3 data, and general utility services. All endpoints are pay-per-request with no API keys, no rate limits, and no sign-up required — callers simply attach an x402 payment header to each request.\n\nThe specific endpoint at `/api/v1/stripe/charges/179` is listed as \"Premium API Access.\" Its x402 challenge advertises a maximum cost of 20,000 base units of USDC (asset 0x8335…2913) on the Base network, which equals $0.02 per request (USDC uses 6 decimals, so 20000 / 10^6 = $0.02). Payment is made to address 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3 using the \"exact\" payment scheme with a 300-second timeout.\n\nThe broader platform advertises additional 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/request price point. Documentation pages (docs, pricing, README) returned minimal content (only a \"Connect wallet\" prompt), so detailed request/response schemas and parameter documentation are unavailable. The endpoint is confirmed live via a valid 402 challenge response.","tags":[],"capabilities":["x402-payment","usdc-base-network","pay-per-request","no-api-key","no-rate-limits","data-analytics","ai-inference","finance-data","utility-services","crypto-settlement"],"categories":["api-gateway","data","llm","finance","utility"],"synonyms":["x402 API","pay-per-call API","USDC API","Base network API","micropayment API","lowpaymentfee","crypto API gateway","402 payment API"],"warnings":["No OpenAPI or schema documentation available for any endpoint","Docs, pricing, and README pages return only 'Connect wallet' with no actual content","The specific functionality of /api/v1/stripe/charges/179 is undocumented — 'Premium API Access' is vague","No request body schema or response format is documented anywhere","The endpoint path includes 'stripe/charges' which is unusual for an x402 endpoint and its purpose is unclear"],"endpointUrl":"https://lowpaymentfee.com/api/v1/stripe/charges/179","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/stripe/charges/179","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The endpoint is confirmed live with a valid x402 402 challenge, and the landing page provides a catalog of endpoints with pricing. However, there is no OpenAPI schema, no request/response documentation, no examples, and all docs/pricing/README pages return only a wallet-connect prompt. The specific purpose of the '/api/v1/stripe/charges/179' endpoint beyond 'Premium API Access' is 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'/request':17,36,188 '0.02':16,35,129,140,187 '000':115 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':146 '0x8335':121 '10':138 '20':114 '20000':137 '2913':122 '300':154 '402':221 '402 payment API' '6':134,139 'Base network API' 'USDC API' 'access':105 'addit':161 'address':145 'advertis':109,160 'ai':10,29 'ai-inference' 'ai/ml':57 'analysi':165 'analyt':56 'api':4,23,46,74,104 'asset':120 'attach':87 'base':7,26,116,125 'broader':158 'caller':85 'challeng':108,222 'classif':168 'collect':51 'confirm':216 'connect':201 'content':198 'convers':180 'cost':112 'crypto API gateway' 'crypto-settlement' 'data':9,28,55,60 'data-analytics' 'decim':135 'detail':205 'doc':193 'document':191,210 'embed':169 'endpoint':14,33,53,66,97,162,214 'equal':128 'estim':177 'exact':149 'exchang':172 'feed':171 'financ':11,30 'finance-data' 'finance/web3':59 'gas':176 'gate':3,22,45 'general':62 'generat':182 'geocod':178 'header':91 'host':49 'infer':58 'key':75 'limit':78 'list':101 'live':217 'lowpaymentfee' 'lowpaymentfee.com':39 'made':143 'maximum':111 'micropayment API' 'minim':197 'network':126 'no-api-key' 'no-rate-limits' 'offer':8,27 'page':192 'paramet':209 'pay':69 'pay-per-call API' 'pay-per-request':68 'payment':44,90,141,150 'payment-g':43 'per':70,130 'platform':5,24,47,159 'point':190 'premium':103 'price':170,189,194 'prompt':203 'quot':175 'rate':77,173 'readm':195 'request':71,94,131 'request/response':206 'requir':84 'respons':223 'return':196 'schema':207 'scheme':151 'second':155 'sentiment':164 'servic':64 'sign':82 'sign-up':81 'simpli':86 'span':54 'specif':96 'summar':167 'text':166 'timeout':156 'token':174 'unavail':212 'unit':117 'usdc':19,38,119,132 'usdc-base-network' 'use':133,147 'util':13,32,63 'utility-services' 'valid':179,220 'via':18,37,218 'wallet':202 'x402':2,21,42,89,107 'x402 API' 'x402-gated':1,20 'x402-payment'","prices":[{"id":"aa5e883d-7eac-420d-8098-3bc3f809686f","listingId":"a87e95ff-e862-45c9-b386-1d2d73f91d87","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/stripe/charges/179","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:54:06.471Z"}],"sources":[{"listingId":"a87e95ff-e862-45c9-b386-1d2d73f91d87","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/stripe/charges/179","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:54:06.471Z","lastSeenAt":"2026-04-23T03:31:42.589Z"}],"details":{"listingId":"a87e95ff-e862-45c9-b386-1d2d73f91d87","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/stripe/charges/179 \\\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 valid x402 402 challenge with USDC on Base network","source_url":"https://lowpaymentfee.com/api/v1/stripe/charges/179"},{"claim":"maxAmountRequired is 20000 base units of USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913), equaling $0.02","source_url":"https://lowpaymentfee.com/api/v1/stripe/charges/179"},{"claim":"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":"Platform lists endpoints across data/analytics, AI/ML, finance/Web3, and infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Accessing premium API endpoints without sign-up or API key management","Making one-off data or AI inference requests with per-call USDC micropayments","Integrating pay-as-you-go analytics, finance, or utility services into agent workflows","Querying crypto gas estimates or token quotes with instant crypto settlement"],"bestFor":["Developers wanting zero-friction API access without subscriptions","AI agents that can settle x402 payments autonomously on Base","Projects needing low-cost per-request pricing ($0.02) for diverse API calls"],"notFor":["Users who need detailed API documentation or OpenAPI schemas before integrating","High-volume use cases where subscription-based pricing would be more economical","Teams that cannot transact in USDC on the Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:56.371Z"},"updatedAt":"2026-04-23T03:31:42.589Z"}}