{"id":"99821512-704e-4d3d-b5bd-cc91d335d058","shortId":"KxpYHk","kind":"x402","title":"Pay-per-call premium API access on Base via x402 — $0.02/request in USDC.","tagline":"Pay-per-call premium API access on Base via x402 — $0.02/request in USDC.","description":"This endpoint at lowpaymentfee.com provides \"Premium API Access\" via the x402 payment protocol. The site hosts a broad catalog of pay-per-request APIs spanning data & analytics, AI/ML inference (sentiment analysis, summarization, classification, embeddings), finance & Web3 (price feeds, exchange rates, token quotes, gas estimates), and infrastructure utilities (geocoding, validation, conversion, generation). Each request costs $0.02 in USDC on the Base network, with no API keys, no rate limits, and no minimum commitments required.\n\nThe specific resource probed (/api/v1/generate/resource/106) is labeled \"Premium API Access\" and returned a valid x402 challenge with a maxAmountRequired of 20,000 base units of USDC (0x8335… on Base, 6 decimals), which equals $0.02. Payment is made via the x402 exact scheme: the caller includes an X-PAYMENT header with a signed payment to the provider's address. The endpoint accepts POST requests and returns application/json.\n\nDocumentation is extremely sparse — the /docs, /pricing, /api, and /README pages all render only a \"Connect wallet\" prompt with no further content. There is no OpenAPI spec, no request/response schema documentation, and no usage examples available. The exact functionality behind resource/106 is unclear beyond the generic \"Premium API Access\" label. Prospective users should be aware that without documentation, integration requires experimentation or direct contact with the provider.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","json-api","no-api-key","post-method"],"categories":["api","infrastructure"],"synonyms":["x402 API","pay-per-call API","USDC micropayment API","Base network API","lowpaymentfee","premium API access","crypto-paid API"],"warnings":["No documentation available — /docs, /pricing, /api, and /README all render only a wallet-connect prompt","No OpenAPI or schema definition found; request and response formats are unknown","The exact functionality behind /api/v1/generate/resource/106 ('Premium API Access') is unspecified","The site lists many endpoints but none have documented input/output schemas"],"endpointUrl":"https://lowpaymentfee.com/api/v1/generate/resource/106","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/generate/resource/106","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 challenge, confirming pricing and payment details. However, documentation is effectively nonexistent — all doc pages show only 'Connect wallet'. There is no OpenAPI spec, no request/response schema, and no examples. The specific functionality of resource/106 is unknown beyond its generic 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'/api/v1/generate/resource/106':109 '/docs':177 '/pricing':178 '/readme':181 '/request':13,28 '0.02':12,27,86,138 '000':126 '0x8335':131 '20':125 '6':134 'Base network API' 'USDC micropayment API' 'accept':166 'access':7,22,38,114,220 'address':163 'ai/ml':59 'analysi':62 'analyt':58 'api':6,21,37,55,95,113,219 'application/json':171 'avail':207 'awar':226 'base':9,24,91,127,133 'behind':211 'beyond':215 'broad':48 'call':4,19 'caller':148 'catalog':49 'challeng':120 'classif':64 'commit':103 'connect':187 'contact':235 'content':193 'convers':81 'cost':85 'crypto-paid API' 'data':57 'decim':135 'direct':234 'document':172,202,229 'embed':65 'endpoint':32,165 'equal':137 'estim':75 'exact':145,209 'exampl':206 'exchang':70 'experiment':232 'extrem':174 'feed':69 'financ':66 'function':210 'gas':74 'generat':82 'generic':217 'geocod':79 'header':154 'host':46 'includ':149 'infer':60 'infrastructur':77 'integr':230 'json-api' 'key':96 'label':111,221 'limit':99 'lowpaymentfee' 'lowpaymentfee.com':34 'made':141 'maxamountrequir':123 'minimum':102 'network':92 'no-api-key' 'openapi':197 'page':182 'pay':2,17,52 'pay-per-cal':1,16 'pay-per-call API' 'pay-per-request':51 'payment':42,139,153,158 'per':3,18,53 'post':167 'post-method' 'premium':5,20,36,112,218 'premium API access' 'price':68 'probe':108 'prompt':189 'prospect':222 'protocol':43 'provid':35,161,238 'quot':73 'rate':71,98 'render':184 'request':54,84,168 'request/response':200 'requir':104,231 'resourc':107 'resource/106':212 'return':116,170 'schema':201 'scheme':146 'sentiment':61 'sign':157 'site':45 'span':56 'spars':175 'spec':198 'specif':106 'summar':63 'token':72 'unclear':214 'unit':128 'usag':205 'usdc':15,30,88,130 'usdc-base' 'user':223 'util':78 'valid':80,118 'via':10,25,39,142 'wallet':188 'web3':67 'without':228 'x':152 'x-payment':151 'x402':11,26,41,119,144 'x402 API' 'x402-payment'","prices":[{"id":"e204b0b9-1a84-4632-bd12-e287ce463e02","listingId":"99821512-704e-4d3d-b5bd-cc91d335d058","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/generate/resource/106","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:37:57.165Z"}],"sources":[{"listingId":"99821512-704e-4d3d-b5bd-cc91d335d058","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/generate/resource/106","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:37:57.165Z","lastSeenAt":"2026-04-22T21:30:33.742Z"}],"details":{"listingId":"99821512-704e-4d3d-b5bd-cc91d335d058","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/generate/resource/106 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-signed-payment-header>\" \\\n  -d '{}'","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"The endpoint returns a valid x402 challenge with maxAmountRequired of 20000 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/generate/resource/106"},{"claim":"The site lists APIs across data & analytics, AI/ML, finance & Web3, and infrastructure categories, all at $0.02/request","source_url":"https://lowpaymentfee.com"},{"claim":"Pricing is $0.02 per request with no API keys, no rate limits, and instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"Documentation pages (/docs, /pricing, /api, /README) render only a 'Connect wallet' prompt","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Programmatic access to premium API resources without traditional API key management","Agent-driven workflows that need instant, keyless API access settled in USDC on Base","Integrating pay-per-use API calls into Web3 applications"],"bestFor":["Developers wanting zero-signup, pay-per-call API access","AI agents with x402-compatible payment capabilities","Users who prefer crypto micropayments over subscription billing"],"notFor":["Users who need detailed API documentation or OpenAPI specs before integrating","High-volume consumers who need bulk pricing or rate-limit guarantees","Developers without USDC on the Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:43.418Z"},"updatedAt":"2026-04-22T21:30:33.742Z"}}