{"id":"39e13454-f0b8-44a2-ad8b-3553a5532956","shortId":"YABPHj","kind":"x402","title":"Pay-per-call API platform on Base (USDC) via x402 — data, AI, finance, and utility endpoints at $0.02/request.","tagline":"Pay-per-call API platform on Base (USDC) via x402 — data, AI, finance, and utility endpoints at $0.02/request.","description":"lowpaymentfee.com is an x402-enabled API platform that offers a broad catalog of pay-per-request endpoints settled in USDC on the Base network. The specific endpoint at `/api/v1/transfers/158` is listed as \"Premium API Access\" and costs $0.02 per call (20,000 base units of USDC with 6 decimals). Payment is handled via the x402 protocol: callers attach an `X-PAYMENT` header with a signed payment proof, and the server verifies it before returning the response. No API keys, accounts, or rate limits are advertised.\n\nThe broader platform advertises four endpoint 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. The x402 challenge confirms the endpoint is live, accepts POST requests, and pays to address `0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3` using USDC (`0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913`) on Base.\n\nDocumentation is extremely sparse — the docs, pricing, API, and README pages all render only a \"Connect wallet\" prompt with no additional content. There is no OpenAPI schema, no request/response examples, and no description of what the `/api/v1/transfers/158` endpoint actually returns. The endpoint path suggests a transfer or transaction resource, but its actual functionality is unknown from available materials.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","no-api-key","post-method","json-response"],"categories":["api-platform","crypto"],"synonyms":["x402 API","pay per call API","USDC API","Base network API","micropayment API","lowpaymentfee","402 payment API"],"warnings":["No documentation available — all doc/pricing/API pages render only 'Connect wallet' with no content","No OpenAPI or request/response schema provided for this endpoint","The purpose of /api/v1/transfers/158 ('Premium API Access') is entirely unclear from available materials","The broader platform lists many endpoint categories but none have documented schemas or examples"],"endpointUrl":"https://lowpaymentfee.com/api/v1/transfers/158","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/158","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The x402 challenge is live and confirms pricing and network details, but there is zero documentation on what this specific endpoint does, no request/response schema, and no examples. The docs pages are empty. The endpoint path 'transfers/158' is opaque. This is effectively a stub 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'/request':20,40,177 '0.02':19,39,80,176 '000':84 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':195 '0x833589fcd6edb6e08f4c7c32d4f71b54bda02913':198 '20':83 '402 payment API' '6':90 'Base network API' 'USDC API' 'accept':188 'access':77 'account':123 'actual':239,252 'addit':221 'address':194 'advertis':128,132 'ai':13,33,143 'analysi':147 'analyt':137 'api':5,25,47,76,121,208 'attach':100 'avail':257 'base':8,28,65,85,200 'broad':52 'broader':130 'call':4,24,82 'caller':99 'catalog':53 'categori':135 'challeng':182 'classif':150 'confirm':183 'connect':216 'content':222 'convers':167 'cost':79 'data':12,32,136,140 'decim':91 'descript':233 'doc':206 'document':201 'embed':151 'enabl':46 'endpoint':17,37,59,69,134,170,185,238,242 'estim':161 'exampl':230 'exchang':156 'export':141 'extrem':203 'feed':155 'financ':14,34,152 'four':133 'function':253 'gas':160 'generat':168 'geocod':165 'handl':94 'header':105 'infrastructur':163 'insight':142 'json-response' 'key':122 'learn':145 'limit':126 'list':73,172 'live':187 'lowpaymentfee' 'lowpaymentfee.com':41 'machin':144 'materi':258 'metric':138 'micropayment API' 'network':66 'no-api-key' 'offer':50 'openapi':226 'page':211 'path':243 'pay':2,22,56,192 'pay per call API' 'pay-per-cal':1,21 'pay-per-request':55 'payment':92,104,109 'per':3,23,57,81 'platform':6,26,48,131 'point':179 'post':189 'post-method' 'premium':75 'price':154,178,207 'prompt':218 'proof':110 'protocol':98 'quot':159 'rate':125,157 'readm':210 'render':213 'report':139 'request':58,190 'request/response':229 'resourc':249 'respons':119 'return':117,240 'schema':227 'sentiment':146 'server':113 'settl':60 'sign':108 'spars':204 'specif':68 'suggest':244 'summar':149 'text':148 'token':158 'transact':248 'transfer':246 'unit':86 'unknown':255 'usdc':9,29,62,88,197 'usdc-base' 'use':196 'util':16,36,164 'valid':166 'verifi':114 'via':10,30,95 'wallet':217 'web3':153 'x':103 'x-payment':102 'x402':11,31,45,97,181 'x402 API' 'x402-enabled':44 'x402-payment'","prices":[{"id":"f9bcd8ac-b72d-4cb4-8835-b962de30929c","listingId":"39e13454-f0b8-44a2-ad8b-3553a5532956","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/158","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T19:27:38.012Z"}],"sources":[{"listingId":"39e13454-f0b8-44a2-ad8b-3553a5532956","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/transfers/158","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T19:27:38.012Z","lastSeenAt":"2026-04-23T02:01:53.206Z"}],"details":{"listingId":"39e13454-f0b8-44a2-ad8b-3553a5532956","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/transfers/158 \\\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 402 with x402 challenge requiring X-PAYMENT header, confirming it is live","source_url":"https://lowpaymentfee.com/api/v1/transfers/158"},{"claim":"Price is $0.02 per request (maxAmountRequired 20000 base units USDC, 6 decimals)","source_url":"https://lowpaymentfee.com/api/v1/transfers/158"},{"claim":"USDC asset address 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base network","source_url":"https://lowpaymentfee.com/api/v1/transfers/158"},{"claim":"Platform advertises no API keys, no rate limits, instant access, $0.02/request across all endpoints","source_url":"https://lowpaymentfee.com"},{"claim":"Docs, pricing, API, and README pages show 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","Accessing data, AI, finance, or utility services via x402 protocol"],"bestFor":["Developers or agents wanting no-signup, pay-as-you-go API access","x402-compatible wallets and agents on the Base network","Low-cost micropayment API experimentation"],"notFor":["Users needing detailed API documentation or guaranteed SLAs","Applications requiring free or subscription-based pricing models","Non-crypto payment workflows"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:34.533Z"},"updatedAt":"2026-04-23T02:01:53.206Z"}}