{"id":"b10c7a38-6377-4eac-990a-fcea434b29ff","shortId":"CBctXa","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 at `/api/v1/payments/56` is labeled \"Premium API Access\" and requires a maximum of 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 listed endpoints are priced at $0.02 per request.\n\nHowever, documentation is extremely thin. The docs, API, pricing, 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 example payloads available. The specific functionality behind the `/api/v1/payments/56` endpoint name \"Premium API Access\" is not described beyond its title, making it unclear what data or service it actually returns. The x402 challenge is live and well-formed, confirming the endpoint is operational, but the lack of documentation significantly limits usability.","tags":[],"capabilities":["x402-payment","usdc-base-network","pay-per-request","no-api-key","json-response"],"categories":["api-platform","payments"],"synonyms":["x402 API","micropayment API","USDC pay-per-call","Base network API","lowpaymentfee","crypto API access","402 payment protocol"],"warnings":["No documentation available — docs, API, pricing, and README pages all show only 'Connect wallet'","The specific functionality of /api/v1/payments/56 ('Premium API Access') is not described anywhere","No request or response schema is documented; callers cannot know what to send or expect back","No OpenAPI or machine-readable spec available"],"endpointUrl":"https://lowpaymentfee.com/api/v1/payments/56","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/payments/56","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 well-formed, confirming the endpoint is operational at $0.02/request in USDC on Base. However, there is no OpenAPI spec, no request/response schema, no documentation beyond a wallet-connect prompt, and the actual functionality of this specific endpoint is undescribed. This is effectively a stub 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'/request':13,28 '0.02':12,27,75,151 '000':69 '20':68 '402 payment protocol' 'Base network API' 'USDC pay-per-call' 'accept':46 'access':62,89,202 'across':109 'actual':217 'advertis':80 'ai':119 'analysi':123 'analyt':113 'api':5,20,38,61,82,161,201 'attach':92 'avail':191 'base':8,23,51,70 'behind':195 'beyond':206 'broader':105 'call':4,19,77 'caller':90 'categori':111 'challeng':221 'classif':126 'confirm':228 'connect':170 'convers':143 'crypto API access' 'data':112,116,213 'describ':205 'detail':177 'doc':160 'document':155,186,237 'embed':127 'endpoint':55,108,147,198,230 'estim':137 'exampl':189 'exchang':132 'export':117 'extrem':157 'feed':131 'financ':128 'form':227 'four':110 'function':194 'gas':136 'generat':144 'geocod':141 'header':97 'howev':154 'i.e':74 'infrastructur':139 'insight':118 'instant':88 'json-response' 'key':83 'label':59 'lack':235 'learn':121 'limit':86,239 'list':146 'live':223 'lowpaymentfee' 'lowpaymentfee.com':31 'machin':120 'make':209 'maximum':66 'metric':114 'micropayment API' 'name':199 'network':9,24,52 'no-api-key' 'offer':107 'openapi':181 'oper':232 'page':165 'pay':2,17,35 'pay-per-cal':1,16 'pay-per-request':34 'payload':190 'payment':48,96,102 'per':3,18,36,76,152 'platform':6,21,39,79,106 'premium':60,200 'price':130,149,162 'prompt':172 'proof':103 'protocol':44 'quot':135 'rate':85,133 'readm':164 'render':167 'report':115 'request':37,153 'request/response':184 'requir':64 'return':218 'schema':185 'sentiment':122 'servic':215 'signific':238 'simpli':91 'spec':182 'specif':54,193 'summar':125 'technic':176 'text':124 'thin':158 'titl':208 'token':134 'unclear':211 'unit':71 'usabl':240 'usdc':15,30,47,73 'usdc-base-network' 'use':41 'util':140 'valid':100,142 'via':10,25 'wallet':171 'web3':129 'well':226 'well-form':225 'x':95 'x-payment':94 'x402':11,26,43,101,220 'x402 API' 'x402-payment'","prices":[{"id":"45bd1fa6-ad35-4326-947a-f4fe03128115","listingId":"b10c7a38-6377-4eac-990a-fcea434b29ff","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/payments/56","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:50:47.105Z"}],"sources":[{"listingId":"b10c7a38-6377-4eac-990a-fcea434b29ff","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/payments/56","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:50:47.105Z","lastSeenAt":"2026-04-23T20:02:38.974Z"}],"details":{"listingId":"b10c7a38-6377-4eac-990a-fcea434b29ff","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/payments/56 \\\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/payments/56"},{"claim":"USDC asset contract 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base network","source_url":"https://lowpaymentfee.com/api/v1/payments/56"},{"claim":"Platform advertises $0.02/request, no API keys, no rate limits, instant access","source_url":"https://lowpaymentfee.com"},{"claim":"Docs, API, pricing, and README pages render only 'Connect wallet'","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Accessing premium API data with per-request USDC micropayments on Base","Agent-driven API consumption without pre-registration or API keys","Testing x402 protocol integrations with a low-cost endpoint"],"bestFor":["Developers experimenting with x402 payment protocol","Agents that need keyless, pay-as-you-go API access","Low-volume consumers who want no subscription commitments"],"notFor":["Users who need detailed API documentation or OpenAPI specs before integrating","High-volume production workloads requiring SLA guarantees","Developers who cannot transact in USDC on the Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:06.05Z"},"updatedAt":"2026-04-23T20:02:38.974Z"}}