{"id":"816dc970-42f8-4327-a9f4-bf4ca1e439b3","shortId":"ACYBP8","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 platform that offers a broad catalog of pay-per-request endpoints across data analytics, AI/ML inference, finance/Web3, and infrastructure utilities. All endpoints are priced at $0.02 per request, paid in USDC on the Base network via the x402 protocol. There are no API keys, no rate limits, and no subscription commitments — callers simply attach an X-PAYMENT header with a valid x402 payment proof.\n\nThe specific endpoint at `/api/v1/payments/353` is listed as \"Premium API Access\" and accepts POST requests. Its x402 challenge advertises a maxAmountRequired of 20,000 base units of USDC (0x8335…2913 on Base), which equals $0.02 given USDC's 6 decimals. The response MIME type is application/json. The broader platform lists endpoints for sentiment analysis, text summarization, classification, embeddings, price feeds, exchange rates, token quotes, gas estimates, geocoding, validation, conversion, and data generation — all at the same $0.02 price point.\n\nDocumentation is extremely sparse. The /docs, /pricing, /api, and /README pages all render only a \"Connect wallet\" prompt with no further content. There is no OpenAPI spec, no request/response schema documentation, and no usage examples available from the crawl. The actual functionality behind this specific endpoint (payments/353) and most other endpoints cannot be verified from the available material.","tags":[],"capabilities":["x402-payment","pay-per-request","usdc-base","no-api-key","json-response","post-method"],"categories":["api-platform","infrastructure"],"synonyms":["x402 API","pay-per-call API","micropayment API","USDC API","Base network API","lowpaymentfee","low payment fee"],"warnings":["No documentation available — /docs, /pricing, /api, and /README pages all show only 'Connect wallet' with no content","No OpenAPI or schema specification found for any endpoint","The actual functionality of /api/v1/payments/353 ('Premium API Access') is not described anywhere","Cannot verify what data or service is returned after payment"],"endpointUrl":"https://lowpaymentfee.com/api/v1/payments/353","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/payments/353","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 confirmed) and pricing is clear ($0.02 USDC on Base), but there is no documentation, no OpenAPI schema, no request/response examples, and the actual functionality behind '/api/v1/payments/353' is completely undocumented. The docs, pricing, and README pages are all empty beyond a wallet-connect 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'/api/v1/payments/353':110 '/docs':190 '/pricing':191 '/readme':194 '/request':12,28 '0.02':11,27,66,140,182 '000':129 '0x8335':134 '20':128 '2913':135 '6':144 'Base network API' 'USDC API' 'accept':118 'access':116 'across':52 'actual':225 'advertis':124 'ai/ml':55 'analysi':159 'analyt':54 'api':5,14,21,30,39,83,115 'application/json':151 'attach':94 'avail':220,241 'base':8,24,74,130,137 'behind':227 'broad':44 'broader':153 'call':4,20 'caller':92 'cannot':236 'catalog':45 'challeng':123 'classif':162 'commit':91 'connect':200 'content':206 'convers':174 'crawl':223 'data':53,176 'decim':145 'document':185,215 'embed':163 'enabl':38 'endpoint':51,62,108,156,230,235 'equal':139 'estim':171 'exampl':219 'exchang':166 'extrem':187 'feed':165 'finance/web3':57 'function':226 'gas':170 'generat':177 'geocod':172 'given':141 'header':99 'infer':56 'infrastructur':59 'json-response' 'key':15,31,84 'limit':87 'list':112,155 'low payment fee' 'lowpaymentfee' 'lowpaymentfee.com':33 'materi':242 'maxamountrequir':126 'micropayment API' 'mime':148 'network':75 'no-api-key' 'offer':42 'openapi':210 'page':195 'paid':69 'pay':2,18,48 'pay-per-cal':1,17 'pay-per-call API' 'pay-per-request':47 'payment':98,104 'payments/353':231 'per':3,19,49,67 'platform':6,22,40,154 'point':184 'post':119 'post-method' 'premium':114 'price':64,164,183 'prompt':202 'proof':105 'protocol':79 'quot':169 'rate':86,167 'render':197 'request':50,68,120 'request/response':213 'requir':16,32 'respons':147 'schema':214 'sentiment':158 'simpli':93 'spars':188 'spec':211 'specif':107,229 'subscript':90 'summar':161 'text':160 'token':168 'type':149 'unit':131 'usag':218 'usdc':71,133,142 'usdc-base' 'util':60 'valid':102,173 'verifi':238 'via':9,25,76 'wallet':201 'x':97 'x-payment':96 'x402':10,26,37,78,103,122 'x402 API' 'x402-enabled':36 'x402-payment'","prices":[{"id":"3ad3d169-6f04-4174-b064-a6cdb11d2a40","listingId":"816dc970-42f8-4327-a9f4-bf4ca1e439b3","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/payments/353","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:50:33.197Z"}],"sources":[{"listingId":"816dc970-42f8-4327-a9f4-bf4ca1e439b3","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/payments/353","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:50:33.197Z","lastSeenAt":"2026-04-24T04:03:51.141Z"}],"details":{"listingId":"816dc970-42f8-4327-a9f4-bf4ca1e439b3","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/payments/353 \\\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 (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base","source_url":"https://lowpaymentfee.com/api/v1/payments/353"},{"claim":"Platform offers endpoints across Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"},{"claim":"Documentation pages (/docs, /pricing, /api, /README) render only a 'Connect wallet' prompt","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Accessing premium API functionality with per-request USDC micropayments on Base","Agent-driven API consumption without pre-registration or API key management","Programmatic pay-as-you-go access to data, AI, finance, and utility endpoints"],"bestFor":["Developers wanting zero-signup, pay-per-use API access","AI agents that can settle x402 payments autonomously","Users who prefer crypto micropayments over subscription billing"],"notFor":["Users needing detailed API documentation or OpenAPI specs before integrating","High-volume consumers 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":"2026-02-17T23:14:06.785Z"},"updatedAt":"2026-04-24T04:03:51.141Z"}}