{"id":"d6dc7f2e-dff8-40e9-840b-e6f03ba824f0","shortId":"g36zsN","kind":"x402","title":"Pay-per-call API platform on Base (USDC) offering data, AI, finance, and utility endpoints at $0.02/request.","tagline":"Pay-per-call API platform on Base (USDC) offering data, AI, finance, and utility endpoints at $0.02/request.","description":"lowpaymentfee.com is an x402-enabled API platform that provides a broad catalog of pay-per-request endpoints settled in USDC on the Base network. The specific endpoint at `/api/v1/payments/339` is listed as \"Premium API Access\" and charges up to $0.02 per call (20,000 base units of USDC with 6 decimals). No API keys or rate limits are advertised; callers simply attach an x402 payment header to each request.\n\nThe platform organizes its APIs into four categories: 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 listed endpoints share the same $0.02/request pricing.\n\nDocumentation is extremely sparse — the docs, pricing, API, and README pages all render only a \"Connect wallet\" prompt with no further technical detail. There is no OpenAPI spec, no request/response schema documentation, and no usage examples available from the crawled material. The endpoint is confirmed live via a valid 402 challenge, but the actual functionality behind `/api/v1/payments/339` (labeled \"Premium API Access\") is unclear and does not map to any of the named endpoints on the landing page.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","pay-per-request","data-analytics","ai-inference","sentiment-analysis","text-summarization","classification","embeddings","finance-data","geocoding","no-api-key"],"categories":["api-platform","ai","finance","data"],"synonyms":["low payment fee","x402 API","pay per call API","USDC API","Base network API","micropayment API","402 payment API"],"warnings":["No OpenAPI spec or request/response schema available","Documentation pages (docs, pricing, API, README) all render only 'Connect wallet' with no content","The endpoint path /api/v1/payments/339 does not match any of the named APIs listed on the landing page — its actual functionality is unknown","No examples of request or response payloads are available"],"endpointUrl":"https://lowpaymentfee.com/api/v1/payments/339","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/339","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 via a valid x402 402 challenge, and the landing page lists available APIs with pricing. However, there is no OpenAPI spec, no request/response schema, no documentation beyond a wallet-connect prompt, and the specific endpoint '/api/v1/payments/339' does not correspond to any named API on the site. Effectively a stub 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'/request':19,38,158 '0.02':18,37,80,157 '000':84 '20':83 '402':209 '402 payment API' '6':90 'Base network API' 'USDC API' 'access':75,220 'actual':213 'advertis':99 'ai':12,31,125 'ai-inference' 'analysi':129 'analyt':119 'api':5,24,45,74,93,114,167,219 'attach':102 'avail':196 'base':8,27,63,85 'base-network' 'behind':215 'broad':50 'call':4,23,82 'caller':100 'catalog':51 'categori':117 'challeng':210 'charg':77 'classif':132 'classification' 'confirm':204 'connect':175 'convers':149 'crawl':199 'data':11,30,118,122 'data-analytics' 'decim':91 'detail':182 'doc':165 'document':160,191 'embed':133 'embeddings' 'enabl':44 'endpoint':16,35,57,67,153,202,232 'estim':143 'exampl':195 'exchang':138 'export':123 'extrem':162 'feed':137 'financ':13,32,134 'finance-data' 'four':116 'function':214 'gas':142 'generat':150 'geocod':147 'geocoding' 'header':106 'infrastructur':145 'insight':124 'key':94 'label':217 'land':235 'learn':127 'limit':97 'list':71,152 'live':205 'low payment fee' 'lowpaymentfee.com':39 'machin':126 'map':226 'materi':200 'metric':120 'micropayment API' 'name':231 'network':64 'no-api-key' 'offer':10,29 'openapi':186 'organ':112 'page':170,236 'pay':2,21,54 'pay per call API' 'pay-per-cal':1,20 'pay-per-request':53 'payment':105 'per':3,22,55,81 'platform':6,25,46,111 'premium':73,218 'price':136,159,166 'prompt':177 'provid':48 'quot':141 'rate':96,139 'readm':169 'render':172 'report':121 'request':56,109 'request/response':189 'schema':190 'sentiment':128 'sentiment-analysis' 'settl':58 'share':154 'simpli':101 'spars':163 'spec':187 'specif':66 'summar':131 'technic':181 'text':130 'text-summarization' 'token':140 'unclear':222 'unit':86 'usag':194 'usdc':9,28,60,88 'usdc-settlement' 'util':15,34,146 'valid':148,208 'via':206 'wallet':176 'web3':135 'x402':43,104 'x402 API' 'x402-enabled':42 'x402-payment'","prices":[{"id":"cf5b56e3-edc3-4836-838d-bd9f99f5ee1a","listingId":"d6dc7f2e-dff8-40e9-840b-e6f03ba824f0","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/339","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:50:30.754Z"}],"sources":[{"listingId":"d6dc7f2e-dff8-40e9-840b-e6f03ba824f0","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/payments/339","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:50:30.754Z","lastSeenAt":"2026-04-22T15:01:38.781Z"}],"details":{"listingId":"d6dc7f2e-dff8-40e9-840b-e6f03ba824f0","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/payments/339 \\\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":"All listed endpoints are priced at $0.02 per request with no API keys, no rate limits, and instant access on the Base network","source_url":"https://lowpaymentfee.com"},{"claim":"The x402 challenge for /api/v1/payments/339 specifies maxAmountRequired of 20000 base units of USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base","source_url":"https://lowpaymentfee.com/api/v1/payments/339"},{"claim":"API categories include Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure","source_url":"https://lowpaymentfee.com"},{"claim":"Docs, pricing, API, and README pages render only a 'Connect wallet' prompt","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Accessing AI inference endpoints (sentiment, summarization, classification, embeddings) without API key management","Fetching real-time financial data like token quotes, exchange rates, and gas estimates on a per-call basis","Running data analytics queries and exporting data with per-request billing","Using utility services like geocoding, validation, and conversion with no subscription commitment"],"bestFor":["Developers wanting zero-commitment, pay-as-you-go API access","AI agents that can settle payments via x402 on Base","Projects needing low-cost micropayment-settled API calls without rate limits"],"notFor":["Users who need detailed API documentation or OpenAPI specs before integrating","Applications requiring high-throughput bulk access with negotiated pricing","Developers without access to USDC on the Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:06.911Z"},"updatedAt":"2026-04-22T15:01:38.781Z"}}