{"id":"1d15ede4-5442-4b61-8b95-1330da0259bd","shortId":"5mtGBP","kind":"x402","title":"Pay-per-call API platform on Base (USDC) covering data, AI, finance, and utility endpoints at $0.02/request.","tagline":"Pay-per-call API platform on Base (USDC) covering data, AI, finance, and utility endpoints at $0.02/request.","description":"lowpaymentfee.com is an x402-enabled API platform that offers a broad suite of endpoints spanning data & analytics, AI & machine learning, finance & Web3, and infrastructure utilities. Every endpoint is priced at $0.02 per request, settled in USDC on the Base network via the x402 payment protocol. There are no API keys, no rate limits, and no minimum commitments — callers simply attach an X-PAYMENT header with a valid payment proof to each request.\n\nThe specific endpoint at `/api/v1/transfers/200` is listed as \"Premium API Access.\" Its x402 challenge advertises a maxAmountRequired of 20,000 base units of USDC (0x8335…2913 on Base), which equals $0.02 given USDC's 6 decimals. The endpoint accepts POST requests and returns application/json. Beyond this particular path, the platform advertises roughly 16 endpoints across four categories: metrics/reports/export/insights (data), sentiment/summarize/classify/embeddings (AI), prices/rates/quotes/gas (finance), and geocode/validate/convert/generate (utilities).\n\nDocumentation is extremely thin — the /docs, /pricing, /api, and /README pages all resolve to a wallet-connect prompt with no substantive content. There is no OpenAPI spec, no request/response schema documentation, and no usage examples available from the crawl. The actual behavior and input/output formats of each endpoint are unknown beyond the MIME type (application/json) declared in the x402 challenge.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","data-analytics","ai-sentiment","ai-summarization","ai-classification","ai-embeddings","finance-prices","exchange-rates","crypto-gas","geocoding","validation","conversion"],"categories":["api-platform","ai","finance","data","infrastructure"],"synonyms":["low payment fee","x402 api","pay per call api","usdc api","base network api","micropayment api","crypto api access","402 payment api"],"warnings":["No OpenAPI or schema documentation available — request/response formats are entirely unknown","All doc pages (/docs, /pricing, /api, /README) return only a wallet-connect prompt with no content","The purpose of /api/v1/transfers/200 ('Premium API Access') is unclear — it may be a demo or placeholder","No evidence of the actual AI, finance, or utility endpoint functionality beyond marketing listings on the homepage"],"endpointUrl":"https://lowpaymentfee.com/api/v1/transfers/200","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/200","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The endpoint is live (402 challenge captured) and pricing is clear ($0.02/request in USDC on Base). However, there is no OpenAPI spec, no documented request/response schemas, no usage examples, and all documentation pages are empty wallet-connect prompts. The actual functionality behind 'Premium API Access' at /api/v1/transfers/200 is 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'/api/v1/transfers/200':117 '/docs':184 '/pricing':185 '/readme':188 '/request':19,38 '0.02':18,37,70,143 '000':132 '0x8335':137 '16':165 '20':131 '2913':138 '402 payment api' '6':147 'accept':151 'access':123 'across':167 'actual':220 'advertis':127,163 'ai':12,31,57,173 'ai-classification' 'ai-embeddings' 'ai-sentiment' 'ai-summarization' 'analyt':56 'api':5,24,45,88,122 'application/json':156,234 'attach':99 'avail':215 'base':8,27,78,133,140 'base network api' 'behavior':221 'beyond':157,230 'broad':50 'call':4,23 'caller':97 'categori':169 'challeng':126,239 'commit':96 'connect':196 'content':201 'conversion' 'cover':10,29 'crawl':218 'crypto api access' 'crypto-gas' 'data':11,30,55,171 'data-analytics' 'decim':148 'declar':235 'document':179,210 'enabl':44 'endpoint':16,35,53,66,115,150,166,227 'equal':142 'everi':65 'exampl':214 'exchange-rates' 'extrem':181 'financ':13,32,60,175 'finance-prices' 'format':224 'four':168 'geocode/validate/convert/generate':177 'geocoding' 'given':144 'header':104 'infrastructur':63 'input/output':223 'key':89 'learn':59 'limit':92 'list':119 'low payment fee' 'lowpaymentfee.com':39 'machin':58 'maxamountrequir':129 'metrics/reports/export/insights':170 'micropayment api' 'mime':232 'minimum':95 'network':79 'offer':48 'openapi':205 'page':189 'particular':159 'path':160 'pay':2,21 'pay per call api' 'pay-per-cal':1,20 'pay-per-request' 'payment':83,103,108 'per':3,22,71 'platform':6,25,46,162 'post':152 'premium':121 'price':68 'prices/rates/quotes/gas':174 'prompt':197 'proof':109 'protocol':84 'rate':91 'request':72,112,153 'request/response':208 'resolv':191 'return':155 'rough':164 'schema':209 'sentiment/summarize/classify/embeddings':172 'settl':73 'simpli':98 'span':54 'spec':206 'specif':114 'substant':200 'suit':51 'thin':182 'type':233 'unit':134 'unknown':229 'usag':213 'usdc':9,28,75,136,145 'usdc api' 'usdc-base' 'util':15,34,64,178 'valid':107 'validation' 'via':80 'wallet':195 'wallet-connect':194 'web3':61 'x':102 'x-payment':101 'x402':43,82,125,238 'x402 api' 'x402-enabled':42 'x402-payment'","prices":[{"id":"fe00beea-2816-4a25-8bf4-81fd539841a4","listingId":"1d15ede4-5442-4b61-8b95-1330da0259bd","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/200","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T19:27:49.976Z"}],"sources":[{"listingId":"1d15ede4-5442-4b61-8b95-1330da0259bd","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/transfers/200","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T19:27:49.976Z","lastSeenAt":"2026-04-22T09:01:48.706Z"}],"details":{"listingId":"1d15ede4-5442-4b61-8b95-1330da0259bd","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/transfers/200 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-proof>\" \\\n  -d '{}'","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"Endpoint returns 402 with x402 challenge advertising 20000 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/transfers/200"},{"claim":"Platform lists ~16 endpoints across data, AI, finance, and infrastructure categories at $0.02/request","source_url":"https://lowpaymentfee.com"},{"claim":"No API keys, no rate limits, instant access, Base network","source_url":"https://lowpaymentfee.com"},{"claim":"USDC contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/transfers/200"}],"useCases":["Agent-driven data retrieval and analytics without API key management","On-demand AI inference (sentiment, summarization, classification, embeddings) paid per call","Fetching real-time crypto prices, gas estimates, and exchange rates","Geocoding and data validation as utility microservices"],"bestFor":["AI agents needing keyless, pay-per-use API access on Base","Developers prototyping with low-cost micropayment endpoints","Web3-native applications that already hold USDC on Base"],"notFor":["Production workloads requiring documented request/response schemas and SLAs","Users without USDC on Base or unfamiliar with x402 payment flows","High-volume batch processing where per-request pricing adds up"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:33.959Z"},"updatedAt":"2026-04-22T09:01:48.706Z"}}