{"id":"334c381a-075f-4b39-a66f-bd7cd9ce0556","shortId":"Uz9yxA","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/48` is listed as \"Premium API Access\" and requires up to 20,000 base units of USDC (i.e., $0.02) per call. Payment is handled via the x402 exact scheme — no API keys, no rate limits, and no subscriptions are needed.\n\nThe broader platform advertises four categories of endpoints: 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 x402 challenge was successfully captured, confirming the endpoint is live and accepting POST requests.\n\nDocumentation is extremely sparse — the /docs, /pricing, /api, and /README pages all returned only a \"Connect wallet\" prompt with no further content. There is no OpenAPI schema, no request/response examples, and no detailed documentation available. The exact functionality behind the `/api/v1/stripe/charges/48` path is unclear; the name \"Premium API Access\" and the path segment \"stripe/charges\" suggest it may relate to Stripe payment processing, but this cannot be confirmed from available materials.","tags":[],"capabilities":["x402-payment","usdc-micropayment","base-network","per-request-billing","no-api-key","post-endpoint"],"categories":["payments","infrastructure"],"synonyms":["micropayment API","pay-per-request API","x402 endpoint","USDC API access","low fee API","Base network API","crypto payment gateway"],"warnings":["No documentation available — /docs, /pricing, /api, and /README all return only 'Connect wallet'","No OpenAPI or request/response schema provided","The endpoint path '/api/v1/stripe/charges/48' with description 'Premium API Access' is ambiguous — actual functionality is unknown","No examples of expected request body or response format"],"endpointUrl":"https://lowpaymentfee.com/api/v1/stripe/charges/48","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/48","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The x402 challenge is live and confirms pricing and payment details, but documentation is effectively nonexistent — all doc pages show only 'Connect wallet'. There is no OpenAPI schema, no request/response examples, and the purpose of this specific endpoint ('stripe/charges/48') is ambiguous. The listing is essentially a stub with confirmed 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'/api/v1/stripe/charges/48':69,216 '/docs':181 '/pricing':182 '/readme':185 '/request':17,36,158 '0.02':16,35,87,157 '000':81 '20':80 'Base network API' 'USDC API access' 'accept':173 'access':49,75,224 'advertis':112 'ai':10,29,124 'analysi':128 'analyt':118 'api':4,23,45,74,99,223 'avail':210,244 'base':7,26,63,82 'base-network' 'behind':55,214 'broader':110 'call':89 'cannot':240 'captur':166 'categori':114 'challeng':163 'classif':131 'confirm':167,242 'connect':191 'content':197 'convers':148 'crypto payment gateway' 'data':9,28,117,121 'detail':208 'document':176,209 'embed':132 'endpoint':14,33,54,67,116,151,169 'estim':142 'exact':96,212 'exampl':205 'exchang':137 'export':122 'extrem':178 'feed':136 'financ':11,30,133 'four':113 'function':213 'gas':141 'gate':3,22,48 'generat':149 'geocod':146 'handl':92 'i.e':86 'infrastructur':144 'insight':123 'key':100 'learn':126 'limit':103 'list':71,153 'live':171 'low fee API' 'lowpaymentfee.com':39 'machin':125 'marketplac':46 'materi':245 'may':232 'metric':119 'micropay':60 'micropayment API' 'name':221 'need':108 'network':64 'no-api-key' 'offer':8,27 'openapi':201 'page':186 'path':217,227 'pay-per-request API' 'payment':90,236 'per':57,88 'per-request':56 'per-request-billing' 'platform':5,24,111 'point':160 'post':174 'post-endpoint' 'premium':73,222 'price':135,159 'process':237 'prompt':193 'protocol':44 'quot':140 'rate':102,138 'relat':233 'report':120 'request':58,175 'request/response':204 'requir':77 'return':188 'schema':202 'scheme':97 'segment':228 'sentiment':127 'spars':179 'specif':66 'stripe':235 'stripe/charges':229 'subscript':106 'success':165 'suggest':230 'summar':130 'text':129 'token':139 'unclear':219 'unit':83 'usdc':19,38,59,85 'usdc-micropayment' 'util':13,32,145 'valid':147 'varieti':52 'via':18,37,93 'wallet':192 'web3':134 'x402':2,21,43,95,162 'x402 endpoint' 'x402-gated':1,20 'x402-payment' 'x402-protocol':42","prices":[{"id":"cafbd5b6-2608-4304-9efd-3fb4704224e4","listingId":"334c381a-075f-4b39-a66f-bd7cd9ce0556","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/48","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:54:18.025Z"}],"sources":[{"listingId":"334c381a-075f-4b39-a66f-bd7cd9ce0556","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/stripe/charges/48","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:54:18.025Z","lastSeenAt":"2026-04-23T00:32:07.415Z"}],"details":{"listingId":"334c381a-075f-4b39-a66f-bd7cd9ce0556","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/stripe/charges/48 \\\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 with maxAmountRequired of 20000 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/stripe/charges/48"},{"claim":"All listed endpoints are priced at $0.02/request with no API keys, no rate limits, and instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"The platform offers endpoints in Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset address is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/stripe/charges/48"}],"useCases":["Paying for API access without creating accounts or managing API keys","Making per-request micropayments for data or utility services on Base","Integrating x402-compatible agents with pay-as-you-go endpoints"],"bestFor":["Developers wanting zero-signup API access via crypto micropayments","AI agents that support x402 payment protocol","Users who prefer pay-per-call pricing without subscriptions"],"notFor":["Users needing detailed API documentation or OpenAPI specs before integrating","High-volume consumers who need bulk/discounted pricing","Developers who cannot transact in USDC on the Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:55.88Z"},"updatedAt":"2026-04-23T00:32:07.415Z"}}