{"id":"9eed1598-6e5d-4cb4-81a3-43a8a669868d","shortId":"PErvNP","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/10` is listed as \"Premium API Access\" and returns a 402 challenge requesting up to 20,000 base units of USDC (i.e., $0.02 given USDC's 6 decimals) per call. The platform advertises no API keys, no rate limits, and instant access — you simply attach an x402 payment header to each request.\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 $0.02 per request. Payments settle in USDC on the Base L2 network to address 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3.\n\nDocumentation is extremely sparse — the /docs, /api, /pricing, and /README pages all render only a \"Connect wallet\" prompt with no further technical detail. There is no OpenAPI spec, no request/response schema documentation, and no example payloads available. The endpoint is live (returns a valid 402 challenge), but what the `/api/v1/transfers/10` endpoint actually returns upon successful payment is unknown from the available material.","tags":[],"capabilities":["x402-payment","usdc-base-network","pay-per-request","no-api-key","json-response","post-method"],"categories":["api-platform","finance","infrastructure"],"synonyms":["low payment fee","x402 API","USDC pay-per-call","Base network API","micropayment API","crypto API gateway","402 payment API"],"warnings":["No documentation available — /docs, /api, /pricing, and /README pages all render only 'Connect wallet'","No OpenAPI or schema definition found","The actual response payload for /api/v1/transfers/10 is completely unknown","The endpoint name 'Premium API Access' and path '/transfers/10' give no clear indication of functionality"],"endpointUrl":"https://lowpaymentfee.com/api/v1/transfers/10","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/10","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, but documentation is essentially nonexistent — all doc pages show only 'Connect wallet'. There is no OpenAPI spec, no request/response schema, and no indication of what data the /api/v1/transfers/10 endpoint actually returns. The listing is effectively a 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'/api/v1/transfers/10':56,218 '/docs':174 '/pricing':176 '/readme':178 '/request':13,28 '0.02':12,27,78,154 '000':72 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':168 '20':71 '402':66,213 '402 payment API' '6':82 'Base network API' 'USDC pay-per-call' 'accept':46 'access':62,97 'across':113 'actual':220 'address':167 'advertis':88 'ai':123 'analysi':127 'analyt':117 'api':5,20,38,61,90 'attach':100 'avail':205,229 'base':8,23,51,73,163 'broader':109 'call':4,19,85 'categori':115 'challeng':67,214 'classif':130 'connect':184 'convers':147 'crypto API gateway' 'data':116,120 'decim':83 'detail':191 'document':169,200 'embed':131 'endpoint':55,112,150,207,219 'estim':141 'exampl':203 'exchang':136 'export':121 'extrem':171 'feed':135 'financ':132 'four':114 'gas':140 'generat':148 'geocod':145 'given':79 'header':104 'i.e':77 'infrastructur':143 'insight':122 'instant':96 'json-response' 'key':91 'l2':164 'learn':125 'limit':94 'list':58,152 'live':209 'low payment fee' 'lowpaymentfee.com':31 'machin':124 'materi':230 'metric':118 'micropayment API' 'network':9,24,52,165 'no-api-key' 'offer':111 'openapi':195 'page':179 'pay':2,17,35 'pay-per-cal':1,16 'pay-per-request':34 'payload':204 'payment':48,103,157,224 'per':3,18,36,84,155 'platform':6,21,39,87,110 'post-method' 'premium':60 'price':134 'prompt':186 'protocol':44 'quot':139 'rate':93,137 'render':181 'report':119 'request':37,68,107,156 'request/response':198 'return':64,210,221 'schema':199 'sentiment':126 'settl':158 'simpli':99 'spars':172 'spec':196 'specif':54 'success':223 'summar':129 'technic':190 'text':128 'token':138 'unit':74 'unknown':226 'upon':222 'usdc':15,30,47,76,80,160 'usdc-base-network' 'use':41 'util':144 'valid':146,212 'via':10,25 'wallet':185 'web3':133 'x402':11,26,43,102 'x402 API' 'x402-payment'","prices":[{"id":"a4c8aa2c-ef07-4e25-ab41-b432a024712d","listingId":"9eed1598-6e5d-4cb4-81a3-43a8a669868d","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/10","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T19:27:17.937Z"}],"sources":[{"listingId":"9eed1598-6e5d-4cb4-81a3-43a8a669868d","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/transfers/10","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T19:27:17.937Z","lastSeenAt":"2026-04-23T05:01:48.949Z"}],"details":{"listingId":"9eed1598-6e5d-4cb4-81a3-43a8a669868d","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/transfers/10 \\\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":"The endpoint returns a 402 challenge requesting up to 20,000 base units of USDC on Base network","source_url":"https://lowpaymentfee.com/api/v1/transfers/10"},{"claim":"All endpoints are listed at $0.02 per request with no API keys, no rate limits, and instant access","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":"USDC asset address is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/transfers/10"}],"useCases":["Programmatic access to data analytics, AI inference, or financial data without traditional API key signup","Agent-driven workflows that need to pay per call using USDC on Base","Testing x402 protocol integrations with a low-cost endpoint"],"bestFor":["Developers experimenting with x402 payment protocol","AI agents that can autonomously pay for API calls via crypto","Users who want no-signup, no-rate-limit API access"],"notFor":["Users who need detailed API documentation or guaranteed SLAs","Applications requiring high-throughput with predictable fiat billing"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:35.523Z"},"updatedAt":"2026-04-23T05:01:48.949Z"}}