{"id":"6da12520-5a7f-4a67-b3fc-8aca00c83856","shortId":"dQ5aUX","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 an x402-enabled API platform that offers a variety of endpoints across data analytics, AI/ML inference, finance/Web3, and infrastructure utilities. All endpoints are pay-per-request using the x402 protocol, settling payments in USDC on the Base network. The specific endpoint at `/api/v1/charges/179` is labeled \"Premium API Access\" and accepts POST requests.\n\nThe platform advertises a flat $0.02 per request across its listed endpoints, with no API keys, no rate limits, and no minimum commitments required. The x402 challenge captured from this endpoint shows a maxAmountRequired of 20000 base units of USDC (0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base), which equals $0.02 given USDC's 6 decimals. Payment is made via the `exact` scheme to address 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3 with a 300-second timeout.\n\nThe broader platform lists endpoints for 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 price point. However, documentation 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.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","pay-per-request","no-api-key","post-endpoint","json-response"],"categories":["api-platform","infrastructure"],"synonyms":["low payment fee","x402 api","pay per call api","micropayment api","usdc api","base network api","premium api access"],"warnings":["No OpenAPI or schema documentation available — request body format and response structure are unknown","Docs, pricing, API, and README pages all render only 'Connect wallet' with no usable content","The specific functionality of /api/v1/charges/179 ('Premium API Access') is not described anywhere","No examples of successful responses are available"],"endpointUrl":"https://lowpaymentfee.com/api/v1/charges/179","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/charges/179","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The endpoint is live and returns a valid x402 402 challenge, confirming it accepts payments. However, there is no OpenAPI spec, no documented request/response schema, no examples, and the docs/pricing/README pages are all blank beyond a wallet connect prompt. The purpose of this specific '/charges/179' endpoint is unclear beyond the generic 'Premium API Access' label. Effectively a stub 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'/request':13,28 '0.02':12,27,92,132,182 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':147 '0x833589fcd6edb6e08f4c7c32d4f71b54bda02913':127 '20000':122 '300':150 '6':136 'accept':84 'access':82 'across':45,95 'address':146 'advertis':89 'ai/ml':48 'analysi':160 'analyt':47 'api':5,20,37,81,101,192 'avail':222 'base':8,23,71,123,129 'base network api' 'base-network' 'broader':154 'call':4,19 'captur':114 'challeng':113 'classif':163 'commit':109 'connect':201 'content':226 'convers':175 'crawl':225 'data':46 'decim':137 'detail':208 'doc':191 'document':186,217 'embed':164 'enabl':36 'endpoint':44,55,75,98,117,157 'equal':131 'estim':172 'exact':143 'exampl':221 'exchang':167 'extrem':188 'feed':166 'finance/web3':50 'flat':91 'gas':171 'generat':177 'geocod':173 'given':133 'howev':185 'infer':49 'infrastructur':52 'json-response' 'key':102 'label':79 'limit':105 'list':97,156 'low payment fee' 'lowpaymentfee.com':31 'made':140 'maxamountrequir':120 'micropayment api' 'minimum':108 'network':9,24,72 'no-api-key' 'offer':40 'openapi':212 'page':196 'pay':2,17,58 'pay per call api' 'pay-per-cal':1,16 'pay-per-request':57 'payment':66,138 'per':3,18,59,93 'platform':6,21,38,88,155 'point':184 'post':85 'post-endpoint' 'premium':80 'premium api access' 'price':165,183,193 'prompt':203 'protocol':64 'quot':170 'rate':104,168 'readm':195 'render':198 'request':60,86,94 'request/response':215 'requir':110 'schema':216 'scheme':144 'second':151 'sentiment':159 'settl':65 'show':118 'spars':189 'spec':213 'specif':74 'summar':162 'technic':207 'text':161 'timeout':152 'token':169 'unit':124 'usag':220 'usdc':15,30,68,126,134 'usdc api' 'usdc-settlement' 'use':61 'util':53 'valid':174 'varieti':42 'via':10,25,141 'wallet':202 'x402':11,26,35,63,112 'x402 api' 'x402-enabled':34 'x402-payment'","prices":[{"id":"d12d99e9-4738-4570-a26f-81d75dd44ac4","listingId":"6da12520-5a7f-4a67-b3fc-8aca00c83856","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/charges/179","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:44:27.312Z"}],"sources":[{"listingId":"6da12520-5a7f-4a67-b3fc-8aca00c83856","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/charges/179","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:44:27.312Z","lastSeenAt":"2026-04-24T16:31:47.988Z"}],"details":{"listingId":"6da12520-5a7f-4a67-b3fc-8aca00c83856","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/charges/179 \\\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":"Platform advertises $0.02 per request with no API keys, no rate limits, and instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"x402 challenge shows maxAmountRequired of 20000 base units of USDC on Base with exact scheme","source_url":"https://lowpaymentfee.com/api/v1/charges/179"},{"claim":"USDC asset address is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/charges/179"},{"claim":"Docs, pricing, API, and README pages show only 'Connect wallet'","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Agents needing on-demand API access without pre-registration or API keys","Programmatic pay-per-call access to data, AI, finance, or utility endpoints","Testing x402 protocol integrations with a low-cost endpoint"],"bestFor":["Developers exploring x402 payment protocol integrations","AI agents that need keyless, pay-as-you-go API access","Low-volume consumers who want no subscription commitments"],"notFor":["High-volume production workloads requiring detailed SLAs and documentation","Users who need well-documented request/response schemas before integrating"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:24.352Z"},"updatedAt":"2026-04-24T16:31:47.988Z"}}