{"id":"d3b94ca9-fd1c-4c38-b394-d0ec4d441a6e","shortId":"GDkEhZ","kind":"x402","title":"Pay-per-request API suite on Base (USDC) covering analytics, AI, finance, and utilities at $0.02/call.","tagline":"Pay-per-request API suite on Base (USDC) covering analytics, AI, finance, and utilities at $0.02/call.","description":"lowpaymentfee.com is an x402-enabled API platform that offers a broad collection of endpoints spanning data analytics, AI/ML inference, finance/Web3 data, and general-purpose utilities. Every endpoint is priced at $0.02 per request, settled in USDC on the Base network. There are no API keys, no rate limits, and no minimum commitments — callers simply attach an x402 payment header to each request.\n\nThe specific endpoint at `/api/v1/carts/53` is listed as \"Premium API Access\" and returns a 402 challenge requesting up to 20,000 base units of USDC (i.e., $0.02) on Base. The payment scheme is \"exact\" with a 300-second timeout. 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 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 each endpoint is unclear beyond the short labels on the landing page.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","data-analytics","ai-inference","sentiment-analysis","text-summarization","classification","embeddings","finance-data","crypto-quotes","gas-estimates","geocoding","validation","conversion"],"categories":["ai","finance","geo","utilities"],"synonyms":["low payment fee","micropayment API","x402 API","pay-per-call API","USDC API","Base network API","cheap API calls"],"warnings":["No OpenAPI or schema documentation available — endpoint behavior is unknown beyond the label 'Premium API Access'","All doc/pricing/README pages render only 'Connect wallet' with no content","The specific endpoint path '/api/v1/carts/53' does not match any of the advertised API paths on the landing page, making its purpose unclear","No request body schema or response schema is documented anywhere"],"endpointUrl":"https://lowpaymentfee.com/api/v1/carts/53","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/carts/53","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The endpoint is live and returns a valid x402 402 challenge, confirming pricing and network. However, there is no OpenAPI spec, no documented request/response schemas, no usage examples, and all documentation pages are empty beyond a wallet-connect prompt. The actual functionality behind '/api/v1/carts/53' is entirely 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'/api/v1/carts/53':105 '/call':18,36 '/docs':179 '/pricing':180 '/readme':183 '0.02':17,35,69,127,171 '000':121 '20':120 '300':137 '402':115 'Base network API' 'USDC API' 'access':111 'actual':214 'addit':144 'advertis':143 'ai':12,30 'ai-inference' 'ai/ml':55 'analysi':148 'analyt':11,29,54 'api':5,23,43,82,110 'attach':93 'avail':209 'base':8,26,77,122,129 'behind':216 'beyond':221 'broad':48 'broader':141 'caller':91 'challeng':116 'cheap API calls' 'classif':151 'classification' 'collect':49 'commit':90 'connect':189 'content':195 'convers':163 'conversion' 'cover':10,28 'crawl':212 'crypto-quotes' 'data':53,58,165 'data-analytics' 'document':174,204 'embed':152 'embeddings' 'enabl':42 'endpoint':51,65,103,145,218 'estim':160 'everi':64 'exact':134 'exampl':208 'exchang':155 'extrem':176 'feed':154 'financ':13,31 'finance-data' 'finance/web3':57 'function':215 'gas':159 'gas-estimates' 'general':61 'general-purpos':60 'generat':166 'geocod':161 'geocoding' 'header':97 'i.e':126 'infer':56 'key':83 'label':224 'land':227 'limit':86 'list':107 'low payment fee' 'lowpaymentfee.com':37 'micropayment API' 'minimum':89 'network':78 'offer':46 'openapi':199 'page':184,228 'pay':2,20 'pay-per-call API' 'pay-per-request':1,19 'payment':96,131 'per':3,21,70 'platform':44,142 'point':173 'premium':109 'price':67,153,172 'prompt':191 'purpos':62 'quot':158 'rate':85,156 'render':186 'request':4,22,71,100,117 'request/response':202 'return':113 'schema':203 'scheme':132 'second':138 'sentiment':147 'sentiment-analysis' 'settl':72 'short':223 'simpli':92 'span':52 'spars':177 'spec':200 'specif':102 'suit':6,24 'summar':150 'text':149 'text-summarization' 'timeout':139 'token':157 'unclear':220 'unit':123 'usag':207 'usdc':9,27,74,125 'usdc-base' 'util':15,33,63 'valid':162 'validation' 'wallet':190 'x402':41,95 'x402 API' 'x402-enabled':40 'x402-payment'","prices":[{"id":"ff83bd4f-caaa-4280-b5b1-b842b68b1617","listingId":"d3b94ca9-fd1c-4c38-b394-d0ec4d441a6e","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/carts/53","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:36:37.886Z"}],"sources":[{"listingId":"d3b94ca9-fd1c-4c38-b394-d0ec4d441a6e","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/carts/53","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:36:37.886Z","lastSeenAt":"2026-04-22T21:30:30.225Z"}],"details":{"listingId":"d3b94ca9-fd1c-4c38-b394-d0ec4d441a6e","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/carts/53 \\\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":"Endpoint returns 402 with maxAmountRequired of 20000 base units USDC on Base (scheme: exact, 300s timeout)","source_url":"https://lowpaymentfee.com/api/v1/carts/53"},{"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":"Available API categories include Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset address is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/carts/53"}],"useCases":["Agent-driven data retrieval with per-call USDC micropayments","On-demand AI inference (sentiment, summarization, classification, embeddings) without API keys","Fetching real-time crypto quotes and gas estimates via x402","Geocoding and data conversion as a pay-as-you-go utility"],"bestFor":["Developers wanting zero-signup, pay-per-request API access","AI agents that can settle x402 payments in USDC on Base","Prototyping workflows that need cheap, keyless API calls"],"notFor":["Production workloads requiring documented request/response schemas and SLAs","Users without a Base-compatible USDC wallet","High-volume use cases where per-request pricing may add up"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:47.228Z"},"updatedAt":"2026-04-22T21:30:30.225Z"}}