{"id":"0e9122d6-fb12-4c1f-9a24-77f0fda6424a","shortId":"j7AJmk","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/165` 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 priced at $0.02 per request.\n\nThis particular endpoint (`/api/v1/transfers/165`) is labeled \"Premium API Access\" but its actual functionality is not documented beyond that label. The crawled docs, pricing, API, and README pages all returned only a \"Connect wallet\" prompt with no additional content. Without further documentation or example responses, the specific behavior of this endpoint remains unclear.","tags":[],"capabilities":["x402-payment","usdc-base-network","pay-per-request","no-api-key","http-post"],"categories":["api-platform","payments"],"synonyms":["x402 API","micropayment API","USDC pay-per-call","Base network API","lowpaymentfee","low payment fee API","crypto-paid API"],"warnings":["The specific functionality of /api/v1/transfers/165 ('Premium API Access') is not documented anywhere in the crawled material.","All documentation pages (docs, pricing, README, api) returned only 'Connect wallet' with no usable content.","No OpenAPI spec, request schema, or response schema is available.","The endpoint path '/api/v1/transfers/165' with a numeric ID suggests it may be a dynamic or user-specific resource rather than a general-purpose API."],"endpointUrl":"https://lowpaymentfee.com/api/v1/transfers/165","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/165","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 there is no documentation, no OpenAPI schema, no example requests or responses, and the actual functionality behind \"Premium API Access\" is undefined. The docs/pricing/README pages are all blank beyond a wallet-connect 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'/request':13,28 '0.02':12,27,78,153 '000':72 '20':71 '402':66 'Base network API' 'USDC pay-per-call' 'accept':46 'access':62,92,164 'across':112 'actual':167 'addit':192 'advertis':83 'ai':122 'analysi':126 'analyt':116 'api':5,20,38,61,85,163,179 'attach':95 'base':8,23,51,73 'behavior':202 'beyond':172 'broader':108 'call':4,19,80 'caller':93 'categori':114 'challeng':67 'classif':129 'connect':187 'content':193 'convers':146 'crawl':176 'crypto-paid API' 'data':115,119 'doc':177 'document':171,196 'embed':130 'endpoint':55,111,149,158,205 'estim':140 'exampl':198 'exchang':135 'export':120 'feed':134 'financ':131 'four':113 'function':168 'gas':139 'generat':147 'geocod':144 'header':100 'http-post' 'i.e':77 'infrastructur':142 'insight':121 'instant':91 'key':86 'label':161,174 'learn':124 'limit':89 'list':58 'low payment fee API' 'lowpaymentfee' 'lowpaymentfee.com':31 'machin':123 'metric':117 'micropayment API' 'network':9,24,52 'no-api-key' 'offer':110 'page':182 'particular':157 'pay':2,17,35 'pay-per-cal':1,16 'pay-per-request':34 'payment':48,99,105 'per':3,18,36,79,154 'platform':6,21,39,82,109 'premium':60,162 'price':133,151,178 'prompt':189 'proof':106 'protocol':44 'quot':138 'rate':88,136 'readm':181 'remain':206 'report':118 'request':37,68,155 'respons':199 'return':64,184 'sentiment':125 'simpli':94 'specif':54,201 'summar':128 'text':127 'token':137 'unclear':207 'unit':74 'usdc':15,30,47,76 'usdc-base-network' 'use':41 'util':143 'valid':103,145 'via':10,25 'wallet':188 'web3':132 'without':194 'x':98 'x-payment':97 'x402':11,26,43,104 'x402 API' 'x402-payment'","prices":[{"id":"99e4c12e-31e6-4c12-8959-edfcb7a58f14","listingId":"0e9122d6-fb12-4c1f-9a24-77f0fda6424a","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/165","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T19:27:30.712Z"}],"sources":[{"listingId":"0e9122d6-fb12-4c1f-9a24-77f0fda6424a","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/transfers/165","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T19:27:30.712Z","lastSeenAt":"2026-04-22T04:02:11.097Z"}],"details":{"listingId":"0e9122d6-fb12-4c1f-9a24-77f0fda6424a","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/transfers/165 \\\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/transfers/165"},{"claim":"The platform advertises $0.02/request pricing with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset address 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base network","source_url":"https://lowpaymentfee.com/api/v1/transfers/165"},{"claim":"Platform offers endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Accessing premium API data without traditional API key registration","Making one-off API calls paid directly in USDC on Base","Agent-driven workflows that need keyless, pay-as-you-go API access"],"bestFor":["Developers who want to avoid API key management and subscriptions","AI agents that can settle x402 payments autonomously","Users already holding USDC on the Base network"],"notFor":["Users who need detailed API documentation and response schemas before integrating","High-volume callers who would benefit from bulk pricing or subscription plans"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:34.807Z"},"updatedAt":"2026-04-22T04:02:11.097Z"}}