{"id":"a7755c1d-f561-4894-9161-c94abea64ddd","shortId":"RVcutb","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-protocol API marketplace that gates access to a variety of endpoints behind per-request USDC micropayments on the Base network. The specific endpoint at `/api/v1/stripe/charges/16` is listed as \"Premium API Access\" and requires up to 20,000 base units of USDC (i.e., $0.02 given USDC's 6 decimals) per call, settled on-chain to the payTo address.\n\nThe broader platform advertises four categories of APIs: Data & Analytics (metrics, reports, data export, insights), AI & Machine Learning (sentiment analysis, text summarization, classification, embeddings), Finance & Web3 (price feeds, exchange rates, token quotes, gas estimates), and Infrastructure utilities (geocoding, validation, conversion, generation). All endpoints are listed at the same $0.02/request price point. The platform claims no API keys, no rate limits, and instant access — payment is the only authentication mechanism, handled via the x402 `X-PAYMENT` header.\n\nDocumentation is extremely sparse. The `/docs`, `/api`, `/pricing`, and `/README` pages all render only a \"Connect wallet\" prompt with no substantive content. There is no OpenAPI schema, no request/response examples, and no detailed description of what the \"Premium API Access\" endpoint at `/api/v1/stripe/charges/16` actually returns. The endpoint name suggests it may relate to Stripe charge data, but this is speculative. Without documentation or example payloads, agents must discover behavior empirically.","tags":[],"capabilities":["x402-payment-gating","usdc-micropayments","base-network","per-request-billing","no-api-key","data-analytics","ai-inference","finance-data","utility-services"],"categories":["api-marketplace","crypto"],"synonyms":["x402 API","micropayment API","pay-per-request API","USDC gated endpoint","Base network API","lowpaymentfee","low payment fee API","402 payment required API"],"warnings":["No documentation available — /docs, /api, /pricing, and /README pages all show only 'Connect wallet'","No OpenAPI or JSON schema describing request parameters or response format","The purpose of /api/v1/stripe/charges/16 is unclear — the name suggests Stripe charge data but this is unconfirmed","No request or response examples available anywhere in crawled content"],"endpointUrl":"https://lowpaymentfee.com/api/v1/stripe/charges/16","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/16","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The endpoint is live (402 challenge captured) and pricing is clear ($0.02 USDC on Base), but there is zero documentation, no OpenAPI schema, no request/response examples, and the purpose of this specific endpoint ('Premium API Access' at /api/v1/stripe/charges/16) is unclear. All doc pages return only 'Connect wallet' with no 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'/api/v1/stripe/charges/16':69,223 '/docs':186 '/pricing':188 '/readme':190 '/request':17,36,152 '0.02':16,35,87,151 '000':81 '20':80 '402 payment required API' '6':91 'Base network API' 'USDC gated endpoint' 'access':49,75,166,220 'actual':224 'address':102 'advertis':106 'agent':246 'ai':10,29,118 'ai-inference' 'analysi':122 'analyt':112 'api':4,23,45,74,110,159,219 'authent':171 'base':7,26,63,82 'base-network' 'behavior':249 'behind':55 'broader':104 'call':94 'categori':108 'chain':98 'charg':235 'claim':157 'classif':125 'connect':196 'content':202 'convers':142 'data':9,28,111,115,236 'data-analytics' 'decim':92 'descript':214 'detail':213 'discov':248 'document':181,242 'embed':126 'empir':250 'endpoint':14,33,54,67,145,221,227 'estim':136 'exampl':210,244 'exchang':131 'export':116 'extrem':183 'feed':130 'financ':11,30,127 'finance-data' 'four':107 'gas':135 'gate':3,22,48 'generat':143 'geocod':140 'given':88 'handl':173 'header':180 'i.e':86 'infrastructur':138 'insight':117 'instant':165 'key':160 'learn':120 'limit':163 'list':71,147 'low payment fee API' 'lowpaymentfee' 'lowpaymentfee.com':39 'machin':119 'marketplac':46 'may':231 'mechan':172 'metric':113 'micropay':60 'micropayment API' 'must':247 'name':228 'network':64 'no-api-key' 'offer':8,27 'on-chain':96 'openapi':206 'page':191 'pay-per-request API' 'payload':245 'payment':167,179 'payto':101 'per':57,93 'per-request':56 'per-request-billing' 'platform':5,24,105,156 'point':154 'premium':73,218 'price':129,153 'prompt':198 'protocol':44 'quot':134 'rate':132,162 'relat':232 'render':193 'report':114 'request':58 'request/response':209 'requir':77 'return':225 'schema':207 'sentiment':121 'settl':95 'spars':184 'specif':66 'specul':240 'stripe':234 'substant':201 'suggest':229 'summar':124 'text':123 'token':133 'unit':83 'usdc':19,38,59,85,89 'usdc-micropayments' 'util':13,32,139 'utility-services' 'valid':141 'varieti':52 'via':18,37,174 'wallet':197 'web3':128 'without':241 'x':178 'x-payment':177 'x402':2,21,43,176 'x402 API' 'x402-gated':1,20 'x402-payment-gating' 'x402-protocol':42","prices":[{"id":"f0c2b56e-297d-4681-9c12-664e6985c1bc","listingId":"a7755c1d-f561-4894-9161-c94abea64ddd","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/16","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:54:05.253Z"}],"sources":[{"listingId":"a7755c1d-f561-4894-9161-c94abea64ddd","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/stripe/charges/16","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:54:05.253Z","lastSeenAt":"2026-04-22T20:01:24.671Z"}],"details":{"listingId":"a7755c1d-f561-4894-9161-c94abea64ddd","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/stripe/charges/16 \\\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 challenge requiring up to 20,000 base units of USDC on Base network","source_url":"https://lowpaymentfee.com/api/v1/stripe/charges/16"},{"claim":"USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/stripe/charges/16"},{"claim":"All listed endpoints are priced at $0.02 per request with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"The platform offers APIs across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"},{"claim":"Documentation pages (/docs, /api, /pricing, /README) render only a 'Connect wallet' prompt","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Accessing premium data or AI inference endpoints without traditional API key signup","Making one-off API calls with on-chain USDC micropayments on Base","Integrating pay-per-use utility services (geocoding, validation, conversion) into agent workflows"],"bestFor":["Developers or agents with Base USDC who want frictionless, keyless API access","Exploring x402-protocol payment flows at low cost ($0.02/call)","Quick one-shot API calls without subscription commitments"],"notFor":["Users who need detailed API documentation or guaranteed SLAs before integrating","High-volume use cases where per-request on-chain payments add unacceptable latency or cost"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:56.47Z"},"updatedAt":"2026-04-22T20:01:24.671Z"}}