{"id":"725d1d9c-00ad-4749-952c-556ff5e71c17","shortId":"6LFBwv","kind":"x402","title":"Pay-per-request API platform on Base via x402 — data, AI, finance, and utility endpoints at $0.02/call.","tagline":"Pay-per-request API platform on Base via x402 — data, AI, finance, and utility endpoints at $0.02/call.","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.\n\nThe specific endpoint at `/api/v1/policies/70` is listed as \"Premium API Access\" and returns a 402 challenge requesting up to 20,000 base units of USDC (0.02 USD, since USDC uses 6 decimals) on Base. Payment is handled via the x402 exact scheme — no API keys, accounts, or rate limits are required. The platform advertises instant access with no minimums or commitments.\n\nDocumentation is extremely sparse. The docs, API, pricing, and README pages all render only a \"Connect wallet\" prompt with no additional content. There is no OpenAPI schema, no request/response examples, and no detailed documentation for any endpoint. The purpose and behavior of the `/api/v1/policies/70` endpoint specifically is unclear — the name \"Premium API Access\" and its placement under a `/policies/` path suggest it may be a meta-endpoint or access policy resource rather than a domain-specific data endpoint. Without documentation or example payloads, the exact functionality cannot be confirmed.","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-platform","llm","finance","geo"],"synonyms":["pay per call API","x402 API","micropayment API","USDC API","Base network API","low fee API","serverless API","no-auth API"],"warnings":["Documentation pages (/docs, /api, /pricing, /README) all render only 'Connect wallet' with no usable content","No OpenAPI or schema available for any endpoint","The specific function of /api/v1/policies/70 ('Premium API Access') is unclear — it may be a meta/policy endpoint rather than a data endpoint","No request or response examples are available anywhere in the crawled material"],"endpointUrl":"https://lowpaymentfee.com/api/v1/policies/70","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/policies/70","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 it works. However, documentation is essentially nonexistent — all doc pages show only 'Connect wallet'. There is no OpenAPI schema, no request/response examples, and the specific purpose of /api/v1/policies/70 is unclear. The listing is effectively a 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'/call':19,38 '/policies':228 '0.02':18,37,99,134 '000':129 '20':128 '402':123 '6':139 'Base network API' 'USDC API' 'access':119,164,222,239 'account':154 'across':58 'addit':190 'advertis':162 'ai':12,31,68 'ai-inference' 'analysi':72 'analyt':62 'api':5,24,45,118,152,176,221 'base':8,27,107,130,142 'behavior':210 'broad':50 'cannot':258 'catalog':51 'categori':60 'challeng':124 'classif':75 'classification' 'commit':169 'confirm':260 'connect':185 'content':191 'convers':92 'data':11,30,61,65,248 'data-analytics' 'decim':140 'detail':202 'doc':175 'document':170,203,251 'domain':246 'domain-specif':245 'embed':76 'embeddings' 'enabl':44 'endpoint':16,35,57,95,111,206,214,237,249 'estim':86 'exact':149,256 'exampl':199,253 'exchang':81 'export':66 'extrem':172 'feed':80 'financ':13,32,77 'finance-data' 'four':59 'function':257 'gas':85 'generat':93 'geocod':90 'geocoding' 'handl':145 'infrastructur':88 'insight':67 'instant':163 'key':153 'learn':70 'limit':157 'list':115 'low fee API' 'lowpaymentfee.com':39 'machin':69 'may':232 'meta':236 'meta-endpoint':235 'metric':63 'micropayment API' 'minimum':167 'name':219 'network':108 'no-auth API' 'offer':48 'openapi':195 'page':180 'paid':102 'path':229 'pay':2,21,54 'pay per call API' 'pay-per-request':1,20,53 'payload':254 'payment':143 'per':3,22,55,100 'placement':225 'platform':6,25,46,161 'polici':240 'premium':117,220 'price':79,97,177 'prompt':187 'purpos':208 'quot':84 'rate':82,156 'rather':242 'readm':179 'render':182 'report':64 'request':4,23,56,101,125 'request/response':198 'requir':159 'resourc':241 'return':121 'schema':196 'scheme':150 'sentiment':71 'sentiment-analysis' 'serverless API' 'sinc':136 'spars':173 'specif':110,215,247 'suggest':230 'summar':74 'text':73 'text-summarization' 'token':83 'unclear':217 'unit':131 'usd':135 'usdc':104,133,137 'usdc-base' 'use':138 'util':15,34,89 'utility-apis' 'valid':91 'via':9,28,146 'wallet':186 'web3':78 'without':250 'x402':10,29,43,148 'x402 API' 'x402-enabled':42 'x402-payment'","prices":[{"id":"564170f1-6d29-4740-80b5-7d011d3a8436","listingId":"725d1d9c-00ad-4749-952c-556ff5e71c17","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/policies/70","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:52:11.664Z"}],"sources":[{"listingId":"725d1d9c-00ad-4749-952c-556ff5e71c17","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/policies/70","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:52:11.664Z","lastSeenAt":"2026-04-23T00:32:01.456Z"}],"details":{"listingId":"725d1d9c-00ad-4749-952c-556ff5e71c17","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/policies/70 \\\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 endpoints are priced at $0.02 per request with no minimums or commitments","source_url":"https://lowpaymentfee.com"},{"claim":"Payment is in USDC on the Base network with no API keys or rate limits","source_url":"https://lowpaymentfee.com"},{"claim":"The 402 challenge requests maxAmountRequired of 20000 base units of USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base","source_url":"https://lowpaymentfee.com/api/v1/policies/70"},{"claim":"Categories include Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure","source_url":"https://lowpaymentfee.com"}],"useCases":["Agents needing on-demand AI inference (sentiment, summarization, classification, embeddings) without API key management","Fetching real-time financial data such as token quotes, gas estimates, and exchange rates via micropayment","Running utility operations like geocoding, validation, or data conversion on a per-request basis","Accessing analytics metrics and reports without subscription commitments"],"bestFor":["AI agents that need stateless, pay-per-call access to diverse API endpoints","Developers who want to avoid API key registration and subscription overhead","Applications on Base that can settle USDC micropayments natively"],"notFor":["High-volume batch processing where per-request pricing becomes expensive","Users who need detailed documentation, SLAs, or guaranteed uptime","Applications that cannot handle x402 payment flows or USDC on Base"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:01.968Z"},"updatedAt":"2026-04-23T00:32:01.456Z"}}