{"id":"95660cd8-f52b-44f8-b670-e24a2e5d9ea7","shortId":"LexhqE","kind":"x402","title":"x402-gated API suite on Base: analytics, AI, finance, and utility endpoints at $0.02/request.","tagline":"x402-gated API suite on Base: analytics, AI, finance, and utility endpoints at $0.02/request.","description":"lowpaymentfee.com offers a collection of pay-per-call API endpoints gated by the x402 protocol, settling payments in USDC on the Base network. The specific endpoint `/api/v1/cards/69` is listed as \"Premium API Access\" and accepts POST requests with a maximum cost of 20,000 base units of USDC (i.e., $0.02 per request, since USDC uses 6 decimals). No API keys or rate limits are advertised — callers simply attach an X-PAYMENT header to pay per request.\n\nThe broader platform advertises four categories of endpoints: 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 share the same $0.02/request pricing.\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 material. The x402 challenge for this specific endpoint is live and well-formed, but without documentation it is unclear what request body the endpoint expects or what response payload it returns.","tags":[],"capabilities":["x402-payment","per-request-billing","usdc-settlement","base-network","post-endpoint","json-response"],"categories":["general","api-marketplace"],"synonyms":["pay-per-call API","x402 API","micropayment API","USDC API","Base network API","lowpaymentfee","premium API access"],"warnings":["No API documentation available — docs, pricing, API, and README pages all render only 'Connect wallet'","No OpenAPI or schema definition found for any endpoint","The specific purpose and expected request body for /api/v1/cards/69 is undocumented","No response schema or example responses available","Cannot verify what data or functionality any of the advertised endpoints actually provide"],"endpointUrl":"https://lowpaymentfee.com/api/v1/cards/69","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/cards/69","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 exists and accepts payment. However, documentation is essentially nonexistent — all doc/pricing/API pages show only 'Connect wallet'. There is no OpenAPI spec, no request/response schema, and no examples. The purpose of '/api/v1/cards/69' specifically is unclear beyond the generic 'Premium API Access' 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'/request':16,32,159 '0.02':15,31,83,158 '000':77 '20':76 '6':89 'Base network API' 'USDC API' 'accept':68 'access':66 'advertis':98,114 'ai':9,25,126 'analysi':130 'analyt':8,24,120 'api':4,20,42,65,92,167 'attach':101 'avail':197 'base':7,23,55,78 'base-network' 'bodi':223 'broader':112 'call':41 'caller':99 'categori':116 'challeng':204 'classif':133 'collect':36 'connect':176 'convers':150 'cost':74 'crawl':200 'data':119,123 'decim':90 'detail':183 'doc':166 'document':161,192,217 'embed':134 'endpoint':13,29,43,59,118,154,208,225 'estim':144 'exampl':196 'exchang':139 'expect':226 'export':124 'extrem':163 'feed':138 'financ':10,26,135 'form':214 'four':115 'gas':143 'gate':3,19,44 'generat':151 'geocod':148 'header':106 'i.e':82 'infrastructur':146 'insight':125 'json-response' 'key':93 'learn':128 'limit':96 'list':62,153 'live':210 'lowpaymentfee' 'lowpaymentfee.com':33 'machin':127 'materi':201 'maximum':73 'metric':121 'micropayment API' 'network':56 'offer':34 'openapi':187 'page':171 'pay':39,108 'pay-per-cal':38 'pay-per-call API' 'payload':230 'payment':50,105 'per':40,84,109 'per-request-billing' 'platform':113 'post':69 'post-endpoint' 'premium':64 'premium API access' 'price':137,160,168 'prompt':178 'protocol':48 'quot':142 'rate':95,140 'readm':170 'render':173 'report':122 'request':70,85,110,222 'request/response':190 'respons':229 'return':232 'schema':191 'sentiment':129 'settl':49 'share':155 'simpli':100 'sinc':86 'spars':164 'spec':188 'specif':58,207 'suit':5,21 'summar':132 'technic':182 'text':131 'token':141 'unclear':220 'unit':79 'usag':195 'usdc':52,81,87 'usdc-settlement' 'use':88 'util':12,28,147 'valid':149 'wallet':177 'web3':136 'well':213 'well-form':212 'without':216 'x':104 'x-payment':103 'x402':2,18,47,203 'x402 API' 'x402-gated':1,17 'x402-payment'","prices":[{"id":"c4676359-6db5-46ee-9c28-93cbf9d81055","listingId":"95660cd8-f52b-44f8-b670-e24a2e5d9ea7","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/cards/69","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:43:49.170Z"}],"sources":[{"listingId":"95660cd8-f52b-44f8-b670-e24a2e5d9ea7","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/cards/69","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:43:49.170Z","lastSeenAt":"2026-04-22T10:01:40.689Z"}],"details":{"listingId":"95660cd8-f52b-44f8-b670-e24a2e5d9ea7","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/cards/69 \\\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":"The endpoint returns a 402 x402 challenge with maxAmountRequired of 20000 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/cards/69"},{"claim":"All listed endpoints are priced at $0.02/request with no API keys, no rate limits, and instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"The platform advertises endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset address 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base network","source_url":"https://lowpaymentfee.com/api/v1/cards/69"}],"useCases":["Paying per-call for API access without needing API keys or subscriptions","Agent-driven workflows that need on-demand API access with crypto micropayments","Accessing a variety of utility, analytics, AI, and finance endpoints through a single payment protocol"],"bestFor":["Developers or agents wanting zero-signup, pay-as-you-go API access","x402-compatible agents that can settle USDC on Base","Low-volume or sporadic API consumers who prefer per-request billing"],"notFor":["Users needing detailed API documentation or guaranteed SLAs","High-volume consumers who would benefit from bulk pricing or subscriptions","Anyone unable to transact in USDC on the Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:26.194Z"},"updatedAt":"2026-04-22T10:01:40.689Z"}}