{"id":"4ba5fbe2-a84c-437e-8e8d-13d8bd95d207","shortId":"jM9QDq","kind":"x402","title":"x402-gated API collection on Base — pay $0.02 per request in USDC, no API keys required.","tagline":"x402-gated API collection on Base — pay $0.02 per request in USDC, no API keys required.","description":"lowpaymentfee.com hosts a suite of x402-protocol pay-per-call APIs spanning data analytics, AI/ML inference, finance/Web3 data, and utility services. Every endpoint is gated by the x402 payment challenge: callers attach a USDC payment on the Base network in the X-PAYMENT header and receive the response immediately — no API keys, no accounts, no rate limits.\n\nThe specific endpoint at `/api/v1/collections/29` is listed as \"Premium API Access\" and accepts POST requests. The x402 challenge advertises a maxAmountRequired of 20,000 base units of USDC (contract 0x8335…2913 on Base), which equals $0.02 per request (USDC uses 6 decimals). The broader site advertises the same $0.02/request price across all its endpoints.\n\nThe site organizes its APIs into four categories: Data & Analytics (metrics, reports, export, insights), AI & Machine Learning (sentiment analysis, text summarization, classification, embeddings), Finance & Web3 (price feeds, exchange rates, token quotes, gas estimates), and Infrastructure (geocoding, validation, conversion, generation). Documentation 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 from the crawled material.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","data-analytics","ai-inference","sentiment-analysis","text-summarization","classification","embeddings","finance-data","crypto-quotes","geocoding","utility-services"],"categories":["api-marketplace","ai","finance","data"],"synonyms":["low payment fee","x402 api","pay per call api","usdc api","base network api","micropayment api","no-auth api","crypto pay api"],"warnings":["No API documentation available — /docs, /api, /pricing, and /README pages all render only 'Connect wallet' with no content","No OpenAPI or JSON schema describing request or response formats for any endpoint","The specific purpose of /api/v1/collections/29 ('Premium API Access') is unclear — it may be a bundle or a specific resource but no details are provided","Cannot verify what data or service is actually delivered after payment"],"endpointUrl":"https://lowpaymentfee.com/api/v1/collections/29","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/collections/29","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The endpoint is live (402 challenge confirmed) and pricing is clear ($0.02 USDC on Base). However, there is no OpenAPI spec, no request/response schema, no documentation beyond endpoint names, and no examples. The /docs and other pages are empty. It is impossible to determine what this specific 'collections/29' endpoint actually returns or what input it expects.","verified":false,"liveness":"unknown","lastLivenessCheck":null,"agentReviews":{"count":0,"score_avg":null,"cost_usd_avg":null,"success_rate":null,"latency_p50_ms":null,"narrative_summary":null,"summary_updated_at":null},"enrichmentModel":"anthropic/claude-opus-4.6","enrichmentVersion":2,"enrichedAt":"2026-04-19T18:00:51.621Z","embedding":[-0.024658203,-0.023956299,0.05419922,0.014381409,0.007873535,-0.035491943,-0.020126343,0.022842407,0.044799805,-0.070617676,0.028274536,-0.07324219,-0.037506104,-0.019073486,-0.016403198,0.018356323,-0.010543823,-0.008529663,-0.047332764,0.044555664,0.026519775,-0.0037059784,-0.012931824,0.018615723,-0.01902771,-0.0020160675,-0.001039505,0.005168915,-0.021865845,-0.0390625,0.028625488,-0.023132324,-0.013130188,0.025863647,-0.0063934326,0.021499634,-0.009414673,0.05441284,0.03857422,0.0032310486,0.003704071,-0.06488037,0.018585205,-0.015541077,-0.042175293,-0.012466431,0.02810669,-0.045013428,-0.023742676,0.0034446716,-0.030838013,0.0093307495,-0.02758789,-0.0038719177,0.006362915,-0.0009098053,-0.026245117,-0.0009417534,0.006374359,0.0093307495,0.0023517609,-0.04827881,-0.015296936,-0.00017881393,0.013626099,0.05343628,0.005264282,0.062561035,-0.0044136047,0.07348633,0.02217102,0.047943115,0.040985107,0.012786865,0.008216858,-0.0062294006,-0.023361206,0.07208252,-0.011940002,-0.02279663,-0.016815186,-0.03353882,-0.047943115,-0.010665894,-0.026626587,-0.06304932,-0.016418457,0.040283203,-0.034942627,0.044799805,-0.07269287,0.006088257,-0.02998352,0.0032539368,-0.0009689331,-0.0063438416,-0.0005426407,0.025939941,-0.00079250336,0.02268982,0.00022399426,-0.05328369,0.027832031,0.026184082,0.059509277,0.04537964,0.022399902,0.018569946,-0.010574341,-0.01109314,-0.024627686,-0.0027217865,-0.023101807,-0.004447937,0.023712158,0.003042221,-0.033966064,0.019134521,-0.03717041,0.007041931,-0.04736328,0.047943115,0.016616821,0.0078125,0.017562866,-0.039611816,-0.01171875,-0.007587433,-0.025421143,-0.013160706,0.026016235,0.011810303,0.03704834,-0.021209717,0.002231598,-0.0101623535,-0.015571594,-0.002243042,-0.05822754,-0.005302429,0.05178833,-0.034179688,0.030899048,0.052764893,-0.07714844,-0.00894928,-0.049316406,0.012077332,-0.020385742,-0.020187378,0.014572144,0.031921387,-0.014701843,-0.01121521,-0.025939941,-0.018066406,-0.015731812,0.04171753,-0.001449585,0.041870117,-0.0029525757,0.015167236,0.0031852722,0.011291504,0.018325806,0.040161133,-0.01876831,-0.080078125,-0.070617676,-0.022964478,0.0076446533,-0.0031871796,-0.03100586,-0.0016241074,-0.015914917,-0.08538818,-0.03616333,-0.0049209595,0.003255844,-0.036010742,-0.022262573,-0.033599854,-0.0035438538,-0.016021729,-0.055267334,-0.0143966675,-0.026779175,0.05859375,0.011154175,0.014732361,0.027648926,-0.0024318695,0.0496521,0.027328491,-0.002752304,-0.036499023,0.028518677,-0.019989014,0.042907715,0.002746582,0.015808105,-0.008079529,0.049926758,0.045959473,0.007167816,-0.03967285,0.001832962,-0.04699707,-0.05444336,-0.042175293,0.009971619,0.017349243,-0.013130188,0.011505127,-0.033477783,-0.034118652,-0.0066184998,0.005466461,0.0071144104,0.06945801,0.016281128,0.017059326,0.026947021,0.013458252,-0.030380249,0.035308838,0.032318115,0.007843018,-0.02268982,-0.023498535,0.039154053,0.035461426,-0.0385437,0.007873535,-0.02217102,0.007068634,-0.0047950745,0.0026683807,0.025665283,-0.005783081,-0.025924683,-0.020553589,0.0022716522,0.042236328,0.008514404,-0.031555176,-0.044830322,-0.097351074,0.04168701,0.045806885,0.026016235,-0.011779785,0.002418518,-0.032073975,-0.0035877228,-0.05404663,0.04977417,0.07647705,-0.018585205,-0.0059509277,0.019714355,-0.00605011,-0.022018433,-0.009719849,-0.023010254,-0.01675415,-0.008781433,0.012077332,-0.02734375,0.0052261353,0.025970459,0.029541016,0.054718018,-0.028625488,-0.050201416,-0.013496399,0.0027999878,-0.010856628,-0.02835083,-0.0076904297,0.009101868,0.030593872,0.043548584,0.013183594,0.034729004,-0.0035648346,0.011161804,-0.00440979,0.0054397583,-0.012191772,-0.0113220215,0.014770508,0.0037498474,-0.070373535,0.01108551,-0.0024604797,0.0390625,-0.047576904,0.029785156,-0.013267517,0.013374329,0.04611206,0.0025920868,-0.04425049,0.0019779205,0.022003174,0.021530151,0.032562256,0.011947632,-0.0090408325,-0.0021476746,0.07757568,-0.03161621,-0.012191772,0.016815186,0.029708862,0.029251099,-0.00737381,-0.054870605,-0.025238037,-0.0062675476,-0.030136108,0.035858154,-0.012634277,0.013893127,-0.005947113,0.018966675,-0.028625488,-0.00028538704,-0.038391113,0.0010519028,-0.011558533,-0.00084733963,-0.000052273273,-0.013404846,-0.0069007874,0.024887085,-0.029510498,0.0059661865,0.044952393,0.013206482,0.00038051605,-0.03604126,-0.014625549,-0.013458252,0.0082092285,0.021057129,0.053955078,0.0025615692,0.040222168,-0.032989502,0.010658264,0.0015611649,0.025390625,0.042144775,-0.010406494,-0.013397217,-0.047912598,-0.045898438,-0.0184021,-0.041168213,0.026260376,0.026916504,-0.013092041,0.04397583,0.007255554,-0.02470398,-0.04562378,0.021759033,-0.041503906,0.0018177032,0.03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'/api/v1/collections/29':99 '/docs':194 '/pricing':195 '/readme':198 '/request':144 '0.02':9,26,130,143 '000':118 '0x8335':124 '20':117 '2913':125 '6':135 'accept':107 'access':105 'account':91 'across':146 'advertis':113,140 'ai':164 'ai-inference' 'ai/ml':51 'analysi':168 'analyt':50,159 'api':4,15,21,32,47,88,104,154 'attach':68 'avail':224 'base':7,24,74,119,127 'base network api' 'broader':138 'call':46 'caller':67 'categori':157 'challeng':66,112 'classif':171 'classification' 'collect':5,22 'connect':204 'content':210 'contract':123 'convers':187 'crawl':227 'crypto pay api' 'crypto-quotes' 'data':49,54,158 'data-analytics' 'decim':136 'document':189,219 'embed':172 'embeddings' 'endpoint':59,97,149 'equal':129 'estim':182 'everi':58 'exampl':223 'exchang':177 'export':162 'extrem':191 'feed':176 'financ':173 'finance-data' 'finance/web3':53 'four':156 'gas':181 'gate':3,20,61 'generat':188 'geocod':185 'geocoding' 'header':81 'host':36 'immedi':86 'infer':52 'infrastructur':184 'insight':163 'key':16,33,89 'learn':166 'limit':94 'list':101 'low payment fee' 'lowpaymentfee.com':35 'machin':165 'materi':228 'maxamountrequir':115 'metric':160 'micropayment api' 'network':75 'no-auth api' 'openapi':214 'organ':152 'page':199 'pay':8,25,44 'pay per call api' 'pay-per-cal':43 'pay-per-request' 'payment':65,71,80 'per':10,27,45,131 'post':108 'premium':103 'price':145,175 'prompt':206 'protocol':42 'quot':180 'rate':93,178 'receiv':83 'render':201 'report':161 'request':11,28,109,132 'request/response':217 'requir':17,34 'respons':85 'schema':218 'sentiment':167 'sentiment-analysis' 'servic':57 'site':139,151 'span':48 'spars':192 'spec':215 'specif':96 'suit':38 'summar':170 'text':169 'text-summarization' 'token':179 'unit':120 'usag':222 'usdc':13,30,70,122,133 'usdc api' 'usdc-base' 'use':134 'util':56 'utility-services' 'valid':186 'wallet':205 'web3':174 'x':79 'x-payment':78 'x402':2,19,41,64,111 'x402 api' 'x402-gated':1,18 'x402-payment' 'x402-protocol':40","prices":[{"id":"7a65fcf1-4f40-4caf-abe9-5f6c9a7c702b","listingId":"4ba5fbe2-a84c-437e-8e8d-13d8bd95d207","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/collections/29","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-19T00:59:36.448Z"}],"sources":[{"listingId":"4ba5fbe2-a84c-437e-8e8d-13d8bd95d207","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/collections/29","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-19T00:59:36.448Z","lastSeenAt":"2026-04-22T02:31:45.936Z"}],"details":{"listingId":"4ba5fbe2-a84c-437e-8e8d-13d8bd95d207","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/collections/29 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-token>\" \\\n  -d '{}'","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/collections/29"},{"claim":"USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/collections/29"},{"claim":"Site advertises $0.02/request pricing with no API keys, no rate limits, and instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"Available API categories include Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure","source_url":"https://lowpaymentfee.com"}],"useCases":["Agents that need on-demand AI inference (sentiment, summarization, classification, embeddings) without managing API keys","Fetching real-time crypto token quotes or gas estimates with per-call USDC micropayments","Geocoding or data validation as a utility service paid per request on Base"],"bestFor":["AI agents with Base USDC wallets needing frictionless API access","Developers prototyping with pay-per-use endpoints and no signup","Web3-native applications that prefer on-chain payment over subscription billing"],"notFor":["High-volume production workloads where $0.02/request adds up quickly without bulk discounts","Users who need detailed API documentation, SLAs, or guaranteed uptime"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:24.794Z"},"updatedAt":"2026-04-22T02:31:45.936Z"}}