{"id":"b01c1f8c-67f7-4c97-86d6-bcbe02b4488d","shortId":"kZ8KDG","kind":"x402","title":"Pay-per-call API suite on Base (USDC) covering data, AI, finance, and utility endpoints at $0.02/request.","tagline":"Pay-per-call API suite 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 collection of endpoints spanning data & analytics, AI & machine learning, finance & Web3, and infrastructure utilities. Every endpoint is priced at $0.02 per request, paid in USDC on the Base network via the x402 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 receive a response.\n\nThe specific endpoint at `/api/v1/item/42` is listed as \"Premium API Access\" and returns `application/json`. Its x402 challenge confirms 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 is discoverable. Other endpoints on the same platform cover sentiment analysis, text summarization, classification, embeddings, price feeds, exchange rates, token quotes, gas estimates, geocoding, validation, conversion, and generation — all at the same $0.02 price point.\n\nDocumentation is extremely sparse: the /docs, /pricing, /api, 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 usage examples available from the crawled material. The endpoint is live (402 challenge confirmed), but without documentation it is unclear what `/api/v1/item/42` specifically returns or what input parameters it expects.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-call","json-response","no-api-key","no-rate-limit","post-method"],"categories":["api-marketplace","infrastructure"],"synonyms":["low payment fee","x402 API","USDC API","Base network API","pay-per-request API","micropayment API","crypto API gateway"],"warnings":["No OpenAPI specification or machine-readable schema available","All documentation pages (/docs, /pricing, /api, /README) contain only 'Connect wallet' with no technical content","The specific purpose and expected input/output of /api/v1/item/42 is undocumented","The endpoint name 'Premium API Access' is generic and does not describe functionality"],"endpointUrl":"https://lowpaymentfee.com/api/v1/item/42","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/item/42","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The endpoint is live with a valid 402 challenge and clear pricing ($0.02 USDC on Base), but there is no OpenAPI spec, no request/response schema, and all documentation pages render only 'Connect wallet' with no usable content. The purpose of /api/v1/item/42 specifically is unknown beyond the generic label 'Premium API 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'/api/v1/item/42':117,248 '/docs':198 '/pricing':199 '/readme':202 '/request':19,38 '0.02':18,37,70,146,190 '000':135 '0x8335':140 '20':134 '2913':141 '402':238 '6':150 'Base network API' 'USDC API' 'accept':154 'access':123 'ai':12,31,57 'analysi':168 'analyt':56 'api':5,24,45,87,122 'application/json':126 'attach':98 'avail':229 'base':8,27,78,136,143 'broad':50 'call':4,23 'caller':96 'challeng':129,239 'classif':171 'collect':51 'commit':95 'confirm':130,240 'connect':208 'convers':183 'cover':10,29,166 'crawl':232 'crypto API gateway' 'data':11,30,55 'decim':151 'detail':215 'discover':159 'document':193,224,243 'embed':172 'enabl':44 'endpoint':16,35,53,66,115,153,161,235 'equal':145 'estim':180 'everi':65 'exampl':228 'exchang':175 'expect':256 'extrem':195 'feed':174 'financ':13,32,60 'gas':179 'generat':185 'geocod':181 'given':147 'header':103 'infrastructur':63 'input':253 'json-response' 'key':88 'learn':59 'limit':91 'list':119 'live':237 'low payment fee' 'lowpaymentfee.com':39 'machin':58 'materi':233 'maxamountrequir':132 'micropayment API' 'minimum':94 'network':79 'no-api-key' 'no-rate-limit' 'offer':48 'openapi':219 'page':203 'paid':73 'paramet':254 'pay':2,21 'pay-per-cal':1,20 'pay-per-call' 'pay-per-request API' 'payment':102,107 'per':3,22,71 'platform':46,165 'point':192 'post':155 'post-method' 'premium':121 'price':68,173,191 'prompt':210 'proof':108 'protocol':83 'quot':178 'rate':90,176 'receiv':110 'render':205 'request':72,156 'request/response':222 'respons':112 'return':125,250 'schema':223 'sentiment':167 'simpli':97 'span':54 'spars':196 'spec':220 'specif':114,249 'suit':6,25 'summar':170 'technic':214 'text':169 'token':177 'unclear':246 'unit':137 'usag':227 'usdc':9,28,75,139,148 'usdc-base' 'util':15,34,64 'valid':106,182 'via':80 'wallet':209 'web3':61 'without':242 'x':101 'x-payment':100 'x402':43,82,128 'x402 API' 'x402-enabled':42 'x402-payment'","prices":[{"id":"af0c6f37-dace-43fa-9fca-bc6fdee508ab","listingId":"b01c1f8c-67f7-4c97-86d6-bcbe02b4488d","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/item/42","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:33:43.540Z"}],"sources":[{"listingId":"b01c1f8c-67f7-4c97-86d6-bcbe02b4488d","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/item/42","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:33:43.540Z","lastSeenAt":"2026-04-23T20:01:27.905Z"}],"details":{"listingId":"b01c1f8c-67f7-4c97-86d6-bcbe02b4488d","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/item/42 \\\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 20000 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/item/42"},{"claim":"All endpoints priced at $0.02 per request with no API keys, no rate limits, and instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"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/item/42"}],"useCases":["Accessing premium data or utility endpoints without API key registration","Making one-off API calls paid in USDC on Base with no subscription","Agent-driven workflows that need low-friction, per-call payment APIs"],"bestFor":["Developers who want instant API access without sign-up or API keys","AI agents that can settle x402 payments autonomously on Base","Users who prefer pay-as-you-go pricing at very low per-call cost"],"notFor":["Users who need detailed API documentation or OpenAPI specs before integrating","High-volume consumers who would benefit from bulk/subscription pricing","Developers without access to USDC on the Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-27T18:31:28.216Z"},"updatedAt":"2026-04-23T20:01:27.905Z"}}