{"id":"d236d74a-f28b-4009-b26f-d9a4aeb4e7bb","shortId":"qEnBQr","kind":"x402","title":"Pay-per-call API platform on Base network via x402 — $0.02/request in USDC.","tagline":"Pay-per-call API platform on Base network via x402 — $0.02/request in USDC.","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/transfers/82` is listed as \"Premium API Access\" and costs $0.02 per call (20,000 base units of USDC with 6 decimals). No API keys, accounts, or rate limits are required — callers simply attach an X-PAYMENT header with a valid x402 payment proof.\n\nThe broader platform advertises multiple API categories including 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 per request price point. Payments settle to address `0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3` using USDC (`0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913`) on Base.\n\nDocumentation is extremely sparse — the docs, API, pricing, and README pages all render only a \"Connect wallet\" prompt with no additional technical detail. There is no OpenAPI schema, no request/response examples, and no description of what the `/api/v1/transfers/82` endpoint actually returns. The endpoint is confirmed live (returns a proper 402 challenge), but the actual functionality behind the paywall is unknown.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","no-api-key","post-endpoint"],"categories":["api-marketplace","crypto"],"synonyms":["lowpaymentfee","low payment fee API","x402 API","USDC pay-per-call","Base network API","micropayment API","402 payment API"],"warnings":["No documentation available — docs, API, pricing, and README pages all show only 'Connect wallet'","No OpenAPI or schema describing request parameters or response format","The specific functionality of /api/v1/transfers/82 is unknown — 'Premium API Access' is not descriptive","No request or response examples available anywhere in crawled content","Cannot verify what data or service is actually delivered after payment"],"endpointUrl":"https://lowpaymentfee.com/api/v1/transfers/82","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/transfers/82","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The endpoint is live and returns a valid x402 402 challenge, confirming pricing and payment details. However, there is no documentation, no OpenAPI schema, no request/response examples, and no description of what the endpoint actually does beyond the generic label 'Premium API Access'. The docs pages are empty. Functionality behind the paywall is entirely 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'/request':13,28 '0.02':12,27,65,148 '000':69 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':157 '0x833589fcd6edb6e08f4c7c32d4f71b54bda02913':160 '20':68 '402':212 '402 payment API' '6':75 'Base network API' 'USDC pay-per-call' 'accept':46 'access':62 'account':80 'actual':202,216 'addit':183 'address':156 'advertis':103 'ai':115 'analysi':119 'analyt':109 'api':5,20,38,61,78,105,169 'attach':88 'base':8,23,51,70,162 'behind':218 'broader':101 'call':4,19,67 'caller':86 'categori':106 'challeng':213 'classif':122 'confirm':207 'connect':178 'convers':139 'cost':64 'data':108,112 'decim':76 'descript':196 'detail':185 'doc':168 'document':163 'embed':123 'endpoint':55,142,201,205 'estim':133 'exampl':193 'exchang':128 'export':113 'extrem':165 'feed':127 'financ':124 'function':217 'gas':132 'generat':140 'geocod':137 'header':93 'includ':107 'infrastructur':135 'insight':114 'key':79 'learn':117 'limit':83 'list':58,144 'live':208 'low payment fee API' 'lowpaymentfee' 'lowpaymentfee.com':31 'machin':116 'metric':110 'micropayment API' 'multipl':104 'network':9,24,52 'no-api-key' 'openapi':189 'page':173 'pay':2,17,35 'pay-per-cal':1,16 'pay-per-request':34 'payment':48,92,98,153 'paywal':220 'per':3,18,36,66,149 'platform':6,21,39,102 'point':152 'post-endpoint' 'premium':60 'price':126,151,170 'prompt':180 'proof':99 'proper':211 'protocol':44 'quot':131 'rate':82,129 'readm':172 'render':175 'report':111 'request':37,150 'request/response':192 'requir':85 'return':203,209 'schema':190 'sentiment':118 'settl':154 'simpli':87 'spars':166 'specif':54 'summar':121 'technic':184 'text':120 'token':130 'unit':71 'unknown':222 'usdc':15,30,47,73,159 'usdc-base' 'use':41,158 'util':136 'valid':96,138 'via':10,25 'wallet':179 'web3':125 'x':91 'x-payment':90 'x402':11,26,43,97 'x402 API' 'x402-payment'","prices":[{"id":"5a7489c5-1f89-475b-8c29-9e0bf58cc2d8","listingId":"d236d74a-f28b-4009-b26f-d9a4aeb4e7bb","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/transfers/82","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T19:27:59.685Z"}],"sources":[{"listingId":"d236d74a-f28b-4009-b26f-d9a4aeb4e7bb","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/transfers/82","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T19:27:59.685Z","lastSeenAt":"2026-04-22T15:32:22.045Z"}],"details":{"listingId":"d236d74a-f28b-4009-b26f-d9a4aeb4e7bb","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/transfers/82 \\\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":"Endpoint returns a valid x402 402 challenge with maxAmountRequired of 20000 USDC base units on Base","source_url":"https://lowpaymentfee.com/api/v1/transfers/82"},{"claim":"Platform lists APIs at $0.02/request across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"},{"claim":"No API keys, no rate limits, no commitments advertised","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset contract is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base network","source_url":"https://lowpaymentfee.com/api/v1/transfers/82"},{"claim":"Docs, API, pricing, and README pages render only 'Connect wallet' with no additional content","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Programmatic access to paid API endpoints without account registration","Agent-driven API consumption with per-call USDC micropayments on Base","Testing x402 protocol integrations with a low-cost endpoint"],"bestFor":["Developers exploring x402 payment protocol","Agents that need keyless, pay-per-call API access","Users who want to avoid subscriptions and pay only per request"],"notFor":["Users who need detailed API documentation or schemas before purchasing","Anyone requiring non-crypto payment methods","High-volume use cases where $0.02/call adds up without volume discounts"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:33.509Z"},"updatedAt":"2026-04-22T15:32:22.045Z"}}