{"id":"84c746be-3478-42f6-8108-8a20b1fdef87","shortId":"BJM4Ns","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":"lowpaymentfee.com offers a suite of pay-per-request APIs accessible via the x402 payment protocol on the Base network. The specific endpoint at `/api/v1/transactions/255` is labeled \"Premium API Access\" and charges 20,000 base units of USDC (0x8335…2913 on Base), which equals $0.02 per call. Payment is made inline via the X-PAYMENT header with no API keys, rate limits, or subscriptions required.\n\nThe broader platform advertises 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 endpoints are listed at the same $0.02/request price point and settle in USDC on Base.\n\nDocumentation is extremely sparse — 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 usage examples available from the crawled content. The endpoint is confirmed live (returns a proper 402 x402 challenge), but what data or functionality the `/api/v1/transactions/255` endpoint actually returns upon successful payment is unknown from available materials.","tags":[],"capabilities":["x402-payment","pay-per-request","usdc-settlement","base-network","no-api-key","no-rate-limit","json-response"],"categories":["api-marketplace","finance"],"synonyms":["low payment fee API","x402 API","micropayment API","pay-per-call API","Base USDC API","premium API access","402 payment protocol"],"warnings":["No API documentation available — docs/pricing/README pages only show 'Connect wallet'","No OpenAPI spec or request/response schema provided","The actual functionality of /api/v1/transactions/255 is unknown","Cannot verify what data or service is delivered upon successful payment"],"endpointUrl":"https://lowpaymentfee.com/api/v1/transactions/255","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/transactions/255","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The endpoint is confirmed live with a valid x402 challenge, but there is no documentation, no request/response schema, and no indication of what data is actually returned. The purpose of '/api/v1/transactions/255' is entirely opaque beyond the generic 'Premium API Access' 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'/request':13,28,146 '0.02':12,27,75,145 '000':64 '0x8335':69 '20':63 '2913':70 '402':204 '402 payment protocol' 'Base USDC API' 'access':7,22,41,60 'across':102 'actual':215 'advertis':100 'ai':112 'analysi':116 'analyt':106 'api':6,21,40,59,90,161 'avail':191,223 'base':9,24,49,65,72,154 'base-network' 'broader':98 'call':4,19,77 'categori':104 'challeng':206 'charg':62 'classif':119 'confirm':199 'connect':170 'content':195 'convers':136 'crawl':194 'data':105,109,209 'detail':177 'doc':160 'document':155,186 'embed':120 'endpoint':53,101,139,197,214 'equal':74 'estim':130 'exampl':190 'exchang':125 'export':110 'extrem':157 'feed':124 'financ':121 'four':103 'function':211 'gas':129 'generat':137 'geocod':134 'header':87 'infrastructur':132 'inlin':81 'insight':111 'json-response' 'key':91 'label':57 'learn':114 'limit':93 'list':141 'live':200 'low payment fee API' 'lowpaymentfee.com':31 'machin':113 'made':80 'materi':224 'metric':107 'micropayment API' 'network':50 'no-api-key' 'no-rate-limit' 'offer':32 'openapi':181 'page':165 'pay':2,17,37 'pay-per-cal':1,16 'pay-per-call API' 'pay-per-request':36 'payment':45,78,86,219 'per':3,18,38,76 'platform':99 'point':148 'premium':5,20,58 'premium API access' 'price':123,147,162 'prompt':172 'proper':203 'protocol':46 'quot':128 'rate':92,126 'readm':164 'render':167 'report':108 'request':39 'request/response':184 'requir':96 'return':201,216 'schema':185 'sentiment':115 'settl':150 'spars':158 'spec':182 'specif':52 'subscript':95 'success':218 'suit':34 'summar':118 'technic':176 'text':117 'token':127 'unit':66 'unknown':221 'upon':217 'usag':189 'usdc':15,30,68,152 'usdc-settlement' 'util':133 'valid':135 'via':10,25,42,82 'wallet':171 'web3':122 'x':85 'x-payment':84 'x402':11,26,44,205 'x402 API' 'x402-payment'","prices":[{"id":"6203ee04-5afb-4327-af93-b034355ab9b8","listingId":"84c746be-3478-42f6-8108-8a20b1fdef87","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/transactions/255","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:59:40.277Z"}],"sources":[{"listingId":"84c746be-3478-42f6-8108-8a20b1fdef87","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/transactions/255","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:59:40.277Z","lastSeenAt":"2026-04-22T16:32:09.384Z"}],"details":{"listingId":"84c746be-3478-42f6-8108-8a20b1fdef87","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/transactions/255 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-token>\"","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"Endpoint returns 402 with x402 challenge requesting 20000 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/transactions/255"},{"claim":"Platform advertises $0.02/request pricing with no API keys, no rate limits, and instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/transactions/255"}],"useCases":["Accessing premium data or transaction information without subscription commitments","Agent-driven API consumption where per-call crypto payment is preferred over API keys","Programmatic access to services with instant settlement on Base L2"],"bestFor":["Developers wanting zero-friction API access without signup or key management","AI agents that can settle x402 payments autonomously","Users who prefer pay-as-you-go pricing at $0.02 per request"],"notFor":["Users needing detailed API documentation or schemas before integrating","High-volume consumers who would benefit from bulk pricing or subscriptions","Developers without access to USDC on Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:40.549Z"},"updatedAt":"2026-04-22T16:32:09.384Z"}}