{"id":"0e18709b-58d3-413d-adfd-9918313b8913","shortId":"dANxPL","kind":"x402","title":"Pay-per-call API platform on Base (USDC) via x402 — $0.02/request, no API keys required.","tagline":"Pay-per-call API platform on Base (USDC) via x402 — $0.02/request, no API keys required.","description":"lowpaymentfee.com is a pay-per-request API platform that uses the x402 protocol to accept USDC payments on the Base network. The specific endpoint `/api/v1/accounts/88` is listed as \"Premium API Access\" and returns a 402 challenge requesting up to 20,000 base units of USDC (i.e., $0.02) per call. The platform advertises no API keys, no rate limits, and instant access — callers simply attach an X-PAYMENT header with a valid x402 payment proof.\n\nThe broader platform offers 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 listed at the same $0.02/request price point.\n\nThis particular endpoint (`/api/v1/accounts/88`) falls under \"Premium API Access\" but its exact response payload is undocumented — no OpenAPI spec, no example responses, and the docs/pricing/README pages all render only a \"Connect wallet\" prompt with no further content. The endpoint is live and responds with a well-formed x402 challenge, but the lack of documentation means callers cannot know what data or functionality it returns without making a paid request.","tags":[],"capabilities":["x402-payment","usdc-base-network","pay-per-request","no-api-key","json-response","http-post"],"categories":["api-platform","data"],"synonyms":["low payment fee","x402 api","pay per call api","usdc api","base network api","micropayment api","402 payment api"],"warnings":["No OpenAPI or schema documentation available — response format is completely unknown","Docs, pricing, and README pages contain no readable content beyond 'Connect wallet'","The purpose of /api/v1/accounts/88 ('Premium API Access') is not explained anywhere","Cannot verify what data or service is returned without making a paid request"],"endpointUrl":"https://lowpaymentfee.com/api/v1/accounts/88","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/accounts/88","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 challenge, but there is no OpenAPI spec, no documented request/response schema, and no example payloads. The docs, pricing, and README pages all render only a wallet-connect prompt with no usable content. The actual functionality behind 'Premium API Access' at /api/v1/accounts/88 is 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'/request':13,30,160 '0.02':12,29,82,159 '000':76 '20':75 '402':70 '402 payment api' 'accept':50 'access':66,96,171 'across':116 'advertis':87 'ai':126 'analysi':130 'analyt':120 'api':5,15,22,32,42,65,89,170 'attach':99 'base':8,25,55,77 'base network api' 'broader':112 'call':4,21,84 'caller':97,219 'cannot':220 'categori':118 'challeng':71,212 'classif':133 'connect':193 'content':199 'convers':150 'data':119,123,223 'docs/pricing/readme':187 'document':217 'embed':134 'endpoint':59,115,153,165,201 'estim':144 'exact':174 'exampl':183 'exchang':139 'export':124 'fall':167 'feed':138 'financ':135 'form':210 'four':117 'function':225 'gas':143 'generat':151 'geocod':148 'header':104 'http-post' 'i.e':81 'infrastructur':146 'insight':125 'instant':95 'json-response' 'key':16,33,90 'know':221 'lack':215 'learn':128 'limit':93 'list':62,155 'live':203 'low payment fee' 'lowpaymentfee.com':35 'machin':127 'make':229 'mean':218 'metric':121 'micropayment api' 'network':56 'no-api-key' 'offer':114 'openapi':180 'page':188 'paid':231 'particular':164 'pay':2,19,39 'pay per call api' 'pay-per-cal':1,18 'pay-per-request':38 'payload':176 'payment':52,103,109 'per':3,20,40,83 'platform':6,23,43,86,113 'point':162 'premium':64,169 'price':137,161 'prompt':195 'proof':110 'protocol':48 'quot':142 'rate':92,140 'render':190 'report':122 'request':41,72,232 'requir':17,34 'respond':205 'respons':175,184 'return':68,227 'sentiment':129 'simpli':98 'spec':181 'specif':58 'summar':132 'text':131 'token':141 'undocu':178 'unit':78 'usdc':9,26,51,80 'usdc api' 'usdc-base-network' 'use':45 'util':147 'valid':107,149 'via':10,27 'wallet':194 'web3':136 'well':209 'well-form':208 'without':228 'x':102 'x-payment':101 'x402':11,28,47,108,211 'x402 api' 'x402-payment'","prices":[{"id":"a11a9ade-b644-4f6a-969f-cff4e8fab056","listingId":"0e18709b-58d3-413d-adfd-9918313b8913","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/accounts/88","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:40:15.847Z"}],"sources":[{"listingId":"0e18709b-58d3-413d-adfd-9918313b8913","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/accounts/88","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:40:15.847Z","lastSeenAt":"2026-04-24T18:32:13.382Z"}],"details":{"listingId":"0e18709b-58d3-413d-adfd-9918313b8913","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/accounts/88 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-proof>\"","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"The endpoint returns a 402 challenge requesting up to 20,000 base units of USDC ($0.02) on Base network","source_url":"https://lowpaymentfee.com/api/v1/accounts/88"},{"claim":"The platform lists endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories, all at $0.02/request","source_url":"https://lowpaymentfee.com"},{"claim":"Platform advertises no API keys, no rate limits, instant access, and Base network settlement","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset address is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/accounts/88"}],"useCases":["Accessing premium account data via a single paid HTTP POST call","Agent-driven workflows that need on-demand API access without pre-registration","Programmatic pay-as-you-go data retrieval settled in USDC on Base"],"bestFor":["Developers or agents wanting zero-signup, pay-per-call API access","x402-compatible agent wallets on the Base network","Low-cost micropayment API consumption at $0.02 per request"],"notFor":["Users who need detailed API documentation or response schemas before purchasing","High-throughput batch workloads where per-request pricing may add up","Anyone without a Base-network USDC wallet or x402-compatible client"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:36.636Z"},"updatedAt":"2026-04-24T18:32:13.382Z"}}