{"id":"2e93fa4b-3db2-4aeb-b25a-eb45720617b4","shortId":"dTBgAH","kind":"x402","title":"Pay-per-request API platform on Base network via x402 — $0.02/call in USDC.","tagline":"Pay-per-request API platform on Base network via x402 — $0.02/call in USDC.","description":"lowpaymentfee.com is an x402-enabled API platform that offers a broad catalog of endpoints spanning data analytics, AI/ML inference, finance/Web3 data, and utility services. All endpoints are paid per-request using USDC on the Base network, with no API keys, no rate limits, and no minimum commitments required.\n\nThe specific endpoint at `/api/v1/policies/2` is listed as \"Premium API Access\" and accepts POST requests. The x402 challenge advertises a maximum cost of 20,000 base units of USDC (0x8335…2913 on Base), which equals $0.02 per request (USDC uses 6 decimals). Payment is made via the x402 exact scheme, settling to the provider's wallet on Base. The endpoint returns application/json.\n\nThe broader platform advertises additional endpoints including sentiment analysis, text summarization, classification, embeddings, price feeds, exchange rates, token quotes, gas estimates, geocoding, validation, conversion, and generation — all at the same $0.02/request price point. However, documentation beyond the landing page 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 actual functionality behind this specific `/api/v1/policies/2` endpoint is unclear from the available material.","tags":[],"capabilities":["x402-payment","per-request-pricing","usdc-base","no-api-key","json-response","post-method"],"categories":["api-platform","infrastructure"],"synonyms":["pay-per-call API","x402 API","micropayment API","USDC API access","Base network API","lowpaymentfee","premium API"],"warnings":["No OpenAPI spec or schema documentation available for any endpoint","The docs, pricing, API, and README pages all render only 'Connect wallet' with no usable content","The actual functionality and expected request/response format of /api/v1/policies/2 is unknown","The platform lists many endpoints on its landing page but none have documented schemas or examples"],"endpointUrl":"https://lowpaymentfee.com/api/v1/policies/2","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/policies/2","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), but there is no documentation, no OpenAPI spec, no request/response schema, and no examples. The actual functionality of the /api/v1/policies/2 endpoint is undocumented — 'Premium API Access' is the only descriptor. Docs pages return only 'Connect wallet' with no 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'/call':13,28 '/request':174 '0.02':12,27,116,173 '000':105 '0x8335':110 '20':104 '2913':111 '6':121 'Base network API' 'USDC API access' 'accept':93 'access':91 'actual':220 'addit':147 'advertis':99,146 'ai/ml':49 'analysi':151 'analyt':48 'api':5,20,37,71,90,188 'application/json':142 'avail':218,231 'base':8,23,67,106,113,138 'behind':222 'beyond':179 'broad':42 'broader':144 'catalog':43 'challeng':98 'classif':154 'commit':79 'connect':197 'convers':166 'cost':102 'data':47,52 'decim':122 'detail':204 'doc':187 'document':178,213 'embed':155 'enabl':36 'endpoint':45,57,83,140,148,226 'equal':115 'estim':163 'exact':129 'exampl':216 'exchang':158 'extrem':184 'feed':157 'finance/web3':51 'function':221 'gas':162 'generat':168 'geocod':164 'howev':177 'includ':149 'infer':50 'json-response' 'key':72 'land':181 'limit':75 'list':87 'lowpaymentfee' 'lowpaymentfee.com':31 'made':125 'materi':232 'maximum':101 'micropayment API' 'minimum':78 'network':9,24,68 'no-api-key' 'offer':40 'openapi':208 'page':182,192 'paid':59 'pay':2,17 'pay-per-call API' 'pay-per-request':1,16 'payload':217 'payment':123 'per':3,18,61,117 'per-request':60 'per-request-pricing' 'platform':6,21,38,145 'point':176 'post':94 'post-method' 'premium':89 'premium API' 'price':156,175,189 'prompt':199 'provid':134 'quot':161 'rate':74,159 'readm':191 'render':194 'request':4,19,62,95,118 'request/response':211 'requir':80 'return':141 'schema':212 'scheme':130 'sentiment':150 'servic':55 'settl':131 'span':46 'spec':209 'specif':82,224 'summar':153 'technic':203 'text':152 'thin':185 'token':160 'unclear':228 'unit':107 'usdc':15,30,64,109,119 'usdc-base' 'use':63,120 'util':54 'valid':165 'via':10,25,126 'wallet':136,198 'x402':11,26,35,97,128 'x402 API' 'x402-enabled':34 'x402-payment'","prices":[{"id":"56cda4d2-f550-45ec-aeea-3ac4327aea03","listingId":"2e93fa4b-3db2-4aeb-b25a-eb45720617b4","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/policies/2","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:51:59.003Z"}],"sources":[{"listingId":"2e93fa4b-3db2-4aeb-b25a-eb45720617b4","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/policies/2","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:51:59.003Z","lastSeenAt":"2026-04-24T00:32:16.677Z"}],"details":{"listingId":"2e93fa4b-3db2-4aeb-b25a-eb45720617b4","quickStartSnippet":"# 1. Send a POST to the endpoint — you'll get a 402 with payment challenge\ncurl -X POST https://lowpaymentfee.com/api/v1/policies/2\n\n# 2. Parse the 402 response, construct an x402 payment header using USDC on Base,\n#    then resend with the X-PAYMENT header attached.\ncurl -X POST https://lowpaymentfee.com/api/v1/policies/2 \\\n  -H \"X-PAYMENT: <signed-x402-payment>\"","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"The endpoint returns a 402 challenge with maxAmountRequired of 20000 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/policies/2"},{"claim":"All endpoints are priced at $0.02 per request with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"The platform offers endpoints across Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"},{"claim":"USDC contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/policies/2"}],"useCases":["Accessing premium API services with per-request USDC micropayments on Base","Agent-driven API consumption without pre-registration or API keys","Programmatic access to data, AI, finance, or utility endpoints via x402 protocol"],"bestFor":["Developers wanting zero-signup, pay-as-you-go API access","AI agents that can settle x402 payments autonomously on Base","Users who prefer crypto micropayments over subscription billing"],"notFor":["Users needing detailed API documentation or OpenAPI specs before integrating","Applications requiring high-volume calls where per-request pricing is inefficient","Users without access to USDC on the Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:02.567Z"},"updatedAt":"2026-04-24T00:32:16.677Z"}}