{"id":"15b030a4-c130-4368-8827-7171abbb5654","shortId":"k6exr3","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":"This endpoint at lowpaymentfee.com provides \"Premium API Access\" via the x402 payment protocol. The site hosts a broad catalog of pay-per-request APIs spanning data & analytics, AI/ML inference (sentiment analysis, summarization, classification, embeddings), finance & Web3 (price feeds, exchange rates, token quotes, gas estimates), and infrastructure utilities (geocoding, validation, conversion, generation). All endpoints are priced at $0.02 per request, settled in USDC on the Base network.\n\nThe specific endpoint `/api/v1/payments/170` is labeled \"Premium API Access\" and returns a valid x402 challenge with a maxAmountRequired of 20,000 base units of USDC (0.02 USD, since USDC uses 6 decimals). Payment is made via the x402 exact scheme to the specified wallet address. The endpoint accepts POST requests and returns application/json responses. No API keys are required; access is granted per-payment with no rate limits advertised.\n\nDocumentation is extremely sparse — the docs, API, pricing, and README pages all render only a \"Connect wallet\" prompt with no further content. There is no OpenAPI schema, no request/response examples, and no description of what this particular endpoint actually returns. The site's landing page lists many endpoints but does not clarify what `/api/v1/payments/170` specifically does versus the other listed routes. Prospective users should be aware that the actual functionality behind this endpoint is undocumented.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","json-response","no-api-key","post-method"],"categories":["api-gateway","payments"],"synonyms":["lowpaymentfee","low payment fee API","x402 premium API","USDC micropayment API","Base network API","pay-per-call API"],"warnings":["No documentation available — docs, API, pricing, and README pages all show only 'Connect wallet'","No OpenAPI or schema describing request parameters or response format","The specific functionality of /api/v1/payments/170 ('Premium API Access') is not explained anywhere","No examples of request bodies or response payloads available"],"endpointUrl":"https://lowpaymentfee.com/api/v1/payments/170","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/payments/170","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 challenge, confirming pricing and payment details. However, there is no OpenAPI schema, no request/response examples, and no documentation explaining what this endpoint actually does or returns. The docs pages are empty beyond a wallet-connect prompt. The listing is effectively a stub with confirmed 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'/request':13,28 '0.02':12,27,88,123 '000':118 '20':117 '6':128 'Base network API' 'USDC micropayment API' 'accept':145 'access':7,22,38,106,157 'actual':206,236 'address':142 'advertis':167 'ai/ml':59 'analysi':62 'analyt':58 'api':6,21,37,55,105,153,174 'application/json':150 'awar':233 'base':9,24,96,119 'behind':238 'broad':48 'call':4,19 'catalog':49 'challeng':112 'clarifi':219 'classif':64 'connect':183 'content':189 'convers':81 'data':57 'decim':129 'descript':200 'doc':173 'document':168 'embed':65 'endpoint':32,84,100,144,205,215,240 'estim':75 'exact':136 'exampl':197 'exchang':70 'extrem':170 'feed':69 'financ':66 'function':237 'gas':74 'generat':82 'geocod':79 'grant':159 'host':46 'infer':60 'infrastructur':77 'json-response' 'key':154 'label':103 'land':211 'limit':166 'list':213,227 'low payment fee API' 'lowpaymentfee' 'lowpaymentfee.com':34 'made':132 'mani':214 'maxamountrequir':115 'network':97 'no-api-key' 'openapi':193 'page':178,212 'particular':204 'pay':2,17,52 'pay-per-cal':1,16 'pay-per-call API' 'pay-per-request':51 'payment':42,130,162 'per':3,18,53,89,161 'per-pay':160 'post':146 'post-method' 'premium':5,20,36,104 'price':68,86,175 'prompt':185 'prospect':229 'protocol':43 'provid':35 'quot':73 'rate':71,165 'readm':177 'render':180 'request':54,90,147 'request/response':196 'requir':156 'respons':151 'return':108,149,207 'rout':228 'schema':194 'scheme':137 'sentiment':61 'settl':91 'sinc':125 'site':45,209 'span':56 'spars':171 'specif':99,222 'specifi':140 'summar':63 'token':72 'undocu':242 'unit':120 'usd':124 'usdc':15,30,93,122,126 'usdc-base' 'use':127 'user':230 'util':78 'valid':80,110 'versus':224 'via':10,25,39,133 'wallet':141,184 'web3':67 'x402':11,26,41,111,135 'x402 premium API' 'x402-payment'","prices":[{"id":"0e0d64c3-8542-4e99-a161-8a994b05b7af","listingId":"15b030a4-c130-4368-8827-7171abbb5654","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/payments/170","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:49:39.037Z"}],"sources":[{"listingId":"15b030a4-c130-4368-8827-7171abbb5654","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/payments/170","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:49:39.037Z","lastSeenAt":"2026-04-23T16:07:15.963Z"}],"details":{"listingId":"15b030a4-c130-4368-8827-7171abbb5654","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/payments/170 \\\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":"All endpoints priced at $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 returns maxAmountRequired of 20000 base units of USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base","source_url":"https://lowpaymentfee.com/api/v1/payments/170"},{"claim":"Site lists APIs across data & analytics, AI/ML, finance & Web3, and infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Programmatic access to premium API services with per-call USDC micropayments","Agent-driven workflows that need keyless, pay-as-you-go API access on Base","Testing x402 payment protocol integrations against a live endpoint"],"bestFor":["Developers experimenting with x402 payment protocol","Agents needing keyless pay-per-request API access","Users who want to avoid subscriptions and pay only per call"],"notFor":["Users who need detailed API documentation or guaranteed SLAs","High-volume use cases where per-call pricing may be inefficient","Anyone requiring non-crypto payment methods"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:09.285Z"},"updatedAt":"2026-04-23T16:07:15.963Z"}}