{"id":"63246b00-8916-4eaa-a112-560d3eeb48a7","shortId":"usA7g8","kind":"x402","title":"Pay-per-call API platform on Base via x402 — $0.02/request, no API keys required.","tagline":"Pay-per-call API platform on Base via x402 — $0.02/request, no API keys required.","description":"lowpaymentfee.com is an x402-enabled API marketplace 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 X-PAYMENT header with a valid x402 payment proof to access any endpoint.\n\nThe specific endpoint at `/api/v1/charges/43` is listed as \"Premium API Access\" and requires a maximum of 20,000 base units of USDC (0x8335…2913 on Base). Since USDC uses 6 decimals, this translates to $0.02 per request. The endpoint accepts POST requests and returns application/json. The 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 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 detailed documentation for what this specific endpoint actually returns or what input parameters it expects. The endpoint is confirmed live (returns a proper 402 challenge), but without documentation it is unclear what data or functionality \"Premium API Access\" specifically provides.","tags":[],"capabilities":["x402-payment","pay-per-request","usdc-settlement","base-network","no-api-key","json-response","http-post"],"categories":["api-marketplace","crypto"],"synonyms":["x402 API","pay-per-call API","USDC API","Base network API","micropayment API","lowpaymentfee","crypto-paid API"],"warnings":["No documentation available — all doc/pricing/README pages render only 'Connect wallet'","No OpenAPI or request/response schema provided","The purpose of 'Premium API Access' at /api/v1/charges/43 is unclear — no description of inputs or outputs","Cannot verify what data or functionality this specific endpoint provides"],"endpointUrl":"https://lowpaymentfee.com/api/v1/charges/43","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/43","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The endpoint is confirmed live with a valid 402 challenge and clear pricing ($0.02 USDC on Base). However, documentation is essentially nonexistent — all doc pages show only 'Connect wallet'. There is no OpenAPI schema, no request/response examples, and no description of what 'Premium API Access' actually returns. The listing is effectively a 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'/request':12,28 '0.02':11,27,138,179 '000':121 '0x8335':126 '20':120 '2913':127 '402':237 '6':133 'Base network API' 'USDC API' 'accept':143 'access':101,114,251 'across':47 'actual':221 'addit':153 'advertis':152 'ai/ml':50 'analysi':157 'analyt':49 'api':5,14,21,30,39,77,113,188,250 'application/json':148 'attach':88 'base':8,24,67,122,129 'base-network' 'broader':150 'call':4,20 'caller':86 'challeng':238 'classif':160 'commit':85 'confirm':232 'connect':197 'content':203 'convers':172 'crypto-paid API' 'data':48,246 'decim':134 'detail':214 'doc':187 'document':182,215,241 'embed':161 'enabl':38 'endpoint':46,57,103,106,142,154,220,230 'estim':169 'exampl':211 'exchang':164 'expect':228 'extrem':184 'feed':163 'finance/web3':52 'function':248 'gas':168 'generat':174 'geocod':170 'header':93 'http-post' 'infer':51 'infrastructur':54 'input':225 'json-response' 'key':15,31,78 'limit':81 'list':110 'live':233 'lowpaymentfee' 'lowpaymentfee.com':33 'marketplac':40 'maximum':118 'micropayment API' 'minimum':84 'network':68 'no-api-key' 'offer':42 'openapi':207 'page':192 'paramet':226 'pay':2,18,60 'pay-per-cal':1,17 'pay-per-call API' 'pay-per-request':59 'payment':92,98 'per':3,19,61,139 'platform':6,22,151 'point':181 'post':144 'premium':112,249 'price':162,180,189 'prompt':199 'proof':99 'proper':236 'protocol':73 'provid':253 'quot':167 'rate':80,165 'readm':191 'render':194 'request':62,140,145 'request/response':210 'requir':16,32,116 'return':147,222,234 'schema':208 'sentiment':156 'settl':69 'simpli':87 'sinc':130 'spars':185 'specif':105,219,252 'summar':159 'text':158 'token':166 'translat':136 'unclear':244 'unit':123 'usdc':64,125,131 'usdc-settlement' 'use':63,132 'util':55 'valid':96,171 'varieti':44 'via':9,25,70 'wallet':198 'without':240 'x':91 'x-payment':90 'x402':10,26,37,72,97 'x402 API' 'x402-enabled':36 'x402-payment'","prices":[{"id":"6d6cd0f9-b6e7-4644-9fb2-fba4d9de30fc","listingId":"63246b00-8916-4eaa-a112-560d3eeb48a7","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/43","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:45:24.757Z"}],"sources":[{"listingId":"63246b00-8916-4eaa-a112-560d3eeb48a7","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/charges/43","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:45:24.757Z","lastSeenAt":"2026-04-23T01:01:24.471Z"}],"details":{"listingId":"63246b00-8916-4eaa-a112-560d3eeb48a7","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/charges/43 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-proof>\"","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":"x402 challenge returns maxAmountRequired of 20000 base units of USDC (0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base, equaling $0.02","source_url":"https://lowpaymentfee.com/api/v1/charges/43"},{"claim":"Platform offers endpoints across Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"},{"claim":"Docs, API, pricing, and README pages all show only 'Connect wallet' with no further content","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Accessing paid API endpoints without traditional API key registration","Making one-off API calls with per-request USDC micropayments on Base","Agent-driven workflows that need frictionless pay-as-you-go API access"],"bestFor":["Developers who want zero-signup, pay-per-use API access","AI agents that can settle x402 payments autonomously on Base","Users who prefer crypto micropayments over subscription billing"],"notFor":["Users who need detailed API documentation or OpenAPI specs before integrating","High-volume callers who would benefit from bulk pricing or subscriptions","Users without access to USDC on the Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:21.663Z"},"updatedAt":"2026-04-23T01:01:24.471Z"}}