{"id":"bb8ad42e-9fe9-4b5d-b676-61f0e8656dfc","shortId":"cFFYvL","kind":"x402","title":"Pay-per-call API platform on Base via x402 — data, AI, finance, and utility endpoints at $0.02/request.","tagline":"Pay-per-call API platform on Base via x402 — data, AI, finance, and utility endpoints at $0.02/request.","description":"lowpaymentfee.com is an x402-enabled API platform that offers a broad catalog of pay-per-request endpoints across 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 endpoints are priced at $0.02 per request, paid in USDC on the Base network via the x402 protocol.\n\nThe specific endpoint at `/api/v1/payments/250` is labeled \"Premium API Access\" and advertises a max amount of 20,000 base units of USDC (0x8335…2913 on Base), which equals $0.02. Payment is made via the x402 exact scheme with no API keys, no rate limits, and no upfront commitments required. The endpoint accepts HTTP POST requests and returns application/json responses.\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 example payloads available. The actual functionality behind the \"Premium API Access\" label at this specific path is unclear; it may be a generic gateway or a specific premium endpoint. Without documentation or example responses, agents should treat this as a low-information listing.","tags":[],"capabilities":["x402-payment","pay-per-request","usdc-base","data-analytics","ai-inference","sentiment-analysis","text-summarization","classification","embeddings","finance-data","geocoding","utility-apis"],"categories":["api-gateway","llm","finance","geo"],"synonyms":["x402 API","pay per call API","USDC API","Base network API","micropayment API","low fee API","crypto API gateway","402 payment API"],"warnings":["Documentation pages (/docs, /pricing, /api, /README) all render only 'Connect wallet' with no usable content","No OpenAPI or schema documentation available for any endpoint","The specific functionality of /api/v1/payments/250 ('Premium API Access') is unclear — it does not match any of the named endpoints in the catalog","No example request or response payloads are available to verify what data is returned","Cannot confirm that the listed AI/finance/utility endpoints actually function as described without testing"],"endpointUrl":"https://lowpaymentfee.com/api/v1/payments/250","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/250","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 with clear pricing ($0.02 USDC on Base). However, documentation is essentially nonexistent — all doc pages show only 'Connect wallet'. There is no OpenAPI spec, no request/response schema, no examples, and the actual functionality of this specific '/api/v1/payments/250' path is ambiguous. The listing is effectively a 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'/api/v1/payments/250':117 '/docs':177 '/pricing':178 '/readme':181 '/request':19,38 '0.02':18,37,99,141 '000':130 '0x8335':135 '20':129 '2913':136 '402 payment API' 'Base network API' 'USDC API' 'accept':164 'access':122,215 'across':58 'actual':209 'advertis':124 'agent':239 'ai':12,31,68 'ai-inference' 'amount':127 'analysi':72 'analyt':62 'api':5,24,45,121,152,214 'application/json':170 'avail':207 'base':8,27,107,131,138 'behind':211 'broad':50 'call':4,23 'catalog':51 'categori':60 'classif':75 'classification' 'commit':160 'connect':187 'content':193 'convers':92 'crypto API gateway' 'data':11,30,61,65 'data-analytics' 'document':172,202,235 'embed':76 'embeddings' 'enabl':44 'endpoint':16,35,57,95,115,163,233 'equal':140 'estim':86 'exact':148 'exampl':205,237 'exchang':81 'export':66 'extrem':174 'feed':80 'financ':13,32,77 'finance-data' 'four':59 'function':210 'gas':85 'gateway':228 'generat':93 'generic':227 'geocod':90 'geocoding' 'http':165 'inform':247 'infrastructur':88 'insight':67 'key':153 'label':119,216 'learn':70 'limit':156 'list':248 'low':246 'low fee API' 'low-inform':245 'lowpaymentfee.com':39 'machin':69 'made':144 'max':126 'may':224 'metric':63 'micropayment API' 'network':108 'offer':48 'openapi':197 'page':182 'paid':102 'path':220 'pay':2,21,54 'pay per call API' 'pay-per-cal':1,20 'pay-per-request':53 'payload':206 'payment':142 'per':3,22,55,100 'platform':6,25,46 'post':166 'premium':120,213,232 'price':79,97 'prompt':189 'protocol':112 'quot':84 'rate':82,155 'render':184 'report':64 'request':56,101,167 'request/response':200 'requir':161 'respons':171,238 'return':169 'schema':201 'scheme':149 'sentiment':71 'sentiment-analysis' 'spars':175 'spec':198 'specif':114,219,231 'summar':74 'text':73 'text-summarization' 'token':83 'treat':241 'unclear':222 'unit':132 'upfront':159 'usdc':104,134 'usdc-base' 'util':15,34,89 'utility-apis' 'valid':91 'via':9,28,109,145 'wallet':188 'web3':78 'without':234 'x402':10,29,43,111,147 'x402 API' 'x402-enabled':42 'x402-payment'","prices":[{"id":"04f21b92-61eb-4838-8aa2-a3f37e3234af","listingId":"bb8ad42e-9fe9-4b5d-b676-61f0e8656dfc","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/250","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:49:59.046Z"}],"sources":[{"listingId":"bb8ad42e-9fe9-4b5d-b676-61f0e8656dfc","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/payments/250","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:49:59.046Z","lastSeenAt":"2026-04-23T04:01:30.922Z"}],"details":{"listingId":"bb8ad42e-9fe9-4b5d-b676-61f0e8656dfc","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/payments/250 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-header>\" \\\n  -d '{}'","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"All 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 platform offers endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"},{"claim":"The x402 challenge for /api/v1/payments/250 advertises maxAmountRequired of 20000 base units of USDC (0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base","source_url":"https://lowpaymentfee.com/api/v1/payments/250"},{"claim":"Documentation pages render only a 'Connect wallet' prompt with no further content","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Agents needing on-demand AI inference (sentiment, summarization, classification, embeddings) without API key management","Fetching real-time financial data like token quotes, gas estimates, and exchange rates via micropayments","Accessing utility services like geocoding, validation, and data conversion on a per-request basis","Building workflows that require pay-as-you-go data analytics and reporting"],"bestFor":["AI agents that need keyless, pay-per-call access to diverse API endpoints","Developers wanting to avoid subscription commitments for low-volume API usage","Web3-native applications already operating on the Base network with USDC"],"notFor":["High-volume production workloads where per-request pricing would be cost-inefficient compared to subscriptions","Users who need detailed API documentation, SLAs, or guaranteed uptime"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:08.354Z"},"updatedAt":"2026-04-23T04:01:30.922Z"}}