{"id":"dc596ea6-0e98-475d-ab2d-7db69b0bd2f0","shortId":"Xd4c3H","kind":"x402","title":"Pay-per-call API suite on Base (USDC) covering data, AI, finance, and utility endpoints at $0.02/request.","tagline":"Pay-per-call API suite on Base (USDC) covering data, AI, finance, and utility endpoints at $0.02/request.","description":"lowpaymentfee.com is an x402-enabled API platform that offers a broad collection of endpoints spanning data & analytics, AI & machine learning, finance & Web3, and infrastructure 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 upfront commitments — callers simply attach an x402 payment header to each request.\n\nThe probed endpoint (`/api/v2/data`) is listed as \"Premium API Access\" and returns a valid x402 challenge (version 1, scheme \"exact\") requesting up to 20,000 base units of USDC (0x8335…2913 on Base), which equals $0.02. The platform advertises additional endpoints including sentiment analysis, text summarization, classification, embeddings, price feeds, exchange rates, token quotes, gas estimates, geocoding, validation, conversion, and generation — all at the same $0.02 price point.\n\nDocumentation is extremely thin: 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 behavior and response format of `/api/v2/data` (and the other endpoints) cannot be confirmed beyond the x402 challenge metadata.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","data-analytics","ai-inference","sentiment-analysis","text-summarization","text-classification","embeddings","finance-data","crypto-quotes","gas-estimates","geocoding","validation","conversion"],"categories":["data","llm","finance","geo"],"synonyms":["pay per call API","x402 API","USDC API","micropayment API","Base network API","low fee API","crypto payment API","on-chain API"],"warnings":["No OpenAPI spec or schema documentation available","All documentation pages (/docs, /pricing, /api, /README) render only 'Connect wallet' with no content","Request and response formats for /api/v2/data are completely undocumented","The actual data or functionality returned by this endpoint is unverified","The broad range of advertised endpoints (AI, finance, geo, etc.) cannot be independently confirmed as functional"],"endpointUrl":"https://lowpaymentfee.com/api/v2/data","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/v2/data","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The x402 challenge is live and pricing is clear ($0.02 USDC on Base), but there is no OpenAPI spec, no request/response schema, no documentation beyond a landing page listing, and no examples. The actual functionality of /api/v2/data is unknown — it could be a stub. This is effectively a stub 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'/api/v2/data':105,216 '/docs':175 '/pricing':176 '/readme':179 '/request':19,38 '0.02':18,37,70,137,167 '000':126 '0x8335':131 '1':119 '20':125 '2913':132 'Base network API' 'USDC API' 'access':111 'actual':210 'addit':141 'advertis':140 'ai':12,31,57 'ai-inference' 'analysi':145 'analyt':56 'api':5,24,45,83,110 'attach':94 'avail':205 'base':8,27,78,127,134 'behavior':211 'beyond':224 'broad':50 'call':4,23 'caller':92 'cannot':221 'challeng':117,227 'classif':148 'collect':51 'commit':91 'confirm':223 'connect':185 'content':191 'convers':160 'conversion' 'cover':10,29 'crawl':208 'crypto payment API' 'crypto-quotes' 'data':11,30,55 'data-analytics' 'document':170,200 'embed':149 'embeddings' 'enabl':44 'endpoint':16,35,53,66,104,142,220 'equal':136 'estim':157 'everi':65 'exact':121 'exampl':204 'exchang':152 'extrem':172 'feed':151 'financ':13,32,60 'finance-data' 'format':214 'gas':156 'gas-estimates' 'generat':162 'geocod':158 'geocoding' 'header':98 'includ':143 'infrastructur':63 'key':84 'learn':59 'limit':87 'list':107 'low fee API' 'lowpaymentfee.com':39 'machin':58 'metadata':228 'micropayment API' 'network':79 'offer':48 'on-chain API' 'openapi':195 'page':180 'pay':2,21 'pay per call API' 'pay-per-cal':1,20 'pay-per-request' 'payment':97 'per':3,22,71 'platform':46,139 'point':169 'premium':109 'price':68,150,168 'probe':103 'prompt':187 'quot':155 'rate':86,153 'render':182 'request':72,101,122 'request/response':198 'respons':213 'return':113 'schema':199 'scheme':120 'sentiment':144 'sentiment-analysis' 'settl':73 'simpli':93 'span':54 'spec':196 'suit':6,25 'summar':147 'text':146 'text-classification' 'text-summarization' 'thin':173 'token':154 'unit':128 'upfront':90 'usag':203 'usdc':9,28,75,130 'usdc-base' 'util':15,34,64 'valid':115,159 'validation' 'version':118 'wallet':186 'web3':61 'x402':43,96,116,226 'x402 API' 'x402-enabled':42 'x402-payment'","prices":[{"id":"eb17b0db-4296-476c-ae17-64ef47bc4b56","listingId":"dc596ea6-0e98-475d-ab2d-7db69b0bd2f0","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/v2/data","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:34:45.507Z"}],"sources":[{"listingId":"dc596ea6-0e98-475d-ab2d-7db69b0bd2f0","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v2/data","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:34:45.507Z","lastSeenAt":"2026-04-23T20:01:33.037Z"}],"details":{"listingId":"dc596ea6-0e98-475d-ab2d-7db69b0bd2f0","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v2/data \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-token>\" \\\n  -d '{}'","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"The endpoint returns a valid x402 challenge with maxAmountRequired of 20000 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v2/data"},{"claim":"All endpoints are 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":"The platform advertises endpoints across data & analytics, AI & ML, finance & Web3, and infrastructure categories","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset address is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v2/data"}],"useCases":["Agents that need on-demand data or AI inference without managing API keys","Fetching real-time crypto prices, gas estimates, or exchange rates with per-call payment","Running sentiment analysis or text summarization via a simple paid HTTP call","Geocoding or data validation as a utility microservice"],"bestFor":["AI agents and bots that can attach x402 payment headers automatically","Developers who want zero-signup, pay-as-you-go API access on Base","Low-volume or sporadic callers who don't want subscription commitments"],"notFor":["Users who need detailed API documentation or guaranteed SLAs before integrating","High-volume production workloads where $0.02/request adds up significantly","Callers who cannot settle payments in USDC on the Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-27T17:21:22.413Z"},"updatedAt":"2026-04-23T20:01:33.037Z"}}