{"id":"3a9ab4ea-c16c-47b5-83ab-f21de4079c4a","shortId":"bEshAR","kind":"x402","title":"Pay-per-call API platform on Base (USDC) covering data, AI, finance, and utility endpoints at $0.02/request.","tagline":"Pay-per-call API platform on Base (USDC) covering data, AI, finance, and utility endpoints at $0.02/request.","description":"lowpaymentfee.com is an x402-enabled API platform that offers a broad catalog of endpoints spanning data & analytics, AI & machine learning, finance & Web3, and infrastructure utilities. Every endpoint is priced at $0.02 per request, paid in USDC on the Base network via the x402 payment protocol. There are no API keys, no rate limits, and no minimum commitments — callers simply attach an X-PAYMENT header with a valid payment proof to access any endpoint.\n\nThe specific endpoint probed (`/api/v1/transfers/100`) is listed as \"Premium API Access\" and returns a standard x402 challenge requesting up to 20,000 base units of USDC (0.02 USD, since USDC uses 6 decimals) on Base. The platform advertises roughly 16 endpoints across four categories: metrics/reports/export/insights (data), sentiment/summarize/classify/embeddings (AI), prices/rates/quotes/gas (finance), and geocode/validate/convert/generate (utilities). All share the same $0.02 flat pricing.\n\nDocumentation 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 usage examples available from the crawl. The endpoint is live and responds with a well-formed x402 challenge, but without documentation it is difficult to know what request bodies each endpoint expects or what response shapes they return.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","data-analytics","sentiment-analysis","text-summarization","text-classification","embeddings","price-feeds","exchange-rates","gas-estimates","geocoding","validation","conversion"],"categories":["ai","finance","data","infrastructure"],"synonyms":["low payment fee","x402 api","pay per call api","usdc api","base network api","micropayment api","data analytics api","sentiment api"],"warnings":["No API documentation available — docs, pricing, API, and README pages all show only 'Connect wallet'","No OpenAPI or schema definitions found; request/response formats are unknown","The specific endpoint path '/api/v1/transfers/100' does not clearly map to any of the advertised endpoint categories, making its purpose unclear","Cannot verify that the advertised AI, finance, or utility endpoints actually function as described"],"endpointUrl":"https://lowpaymentfee.com/api/v1/transfers/100","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/transfers/100","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The endpoint is live and returns a valid x402 challenge, and the landing page lists available endpoints with pricing. However, there is zero documentation beyond the landing page — no OpenAPI spec, no request/response schemas, no examples, and all doc pages render only 'Connect wallet'. The actual functionality behind each endpoint is 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'/request':19,38 '0.02':18,37,70,140,171 '000':135 '16':153 '20':134 '6':145 'access':111,124 'across':155 'advertis':151 'ai':12,31,57,161 'analyt':56 'api':5,24,45,88,123,180 'attach':99 'avail':210 'base':8,27,78,136,148 'base network api' 'bodi':237 'broad':50 'call':4,23 'caller':97 'catalog':51 'categori':157 'challeng':130,226 'commit':96 'connect':189 'conversion' 'cover':10,29 'crawl':213 'data':11,30,55,159 'data analytics api' 'data-analytics' 'decim':146 'detail':196 'difficult':232 'doc':179 'document':174,205,229 'embeddings' 'enabl':44 'endpoint':16,35,53,66,113,116,154,215,239 'everi':65 'exampl':209 'exchange-rates' 'expect':240 'extrem':176 'financ':13,32,60,163 'flat':172 'form':224 'four':156 'gas-estimates' 'geocode/validate/convert/generate':165 'geocoding' 'header':104 'infrastructur':63 'key':89 'know':234 'learn':59 'limit':92 'list':120 'live':217 'low payment fee' 'lowpaymentfee.com':39 'machin':58 'metrics/reports/export/insights':158 'micropayment api' 'minimum':95 'network':79 'offer':48 'openapi':200 'page':184 'paid':73 'pay':2,21 'pay per call api' 'pay-per-cal':1,20 'pay-per-request' 'payment':83,103,108 'per':3,22,71 'platform':6,25,46,150 'premium':122 'price':68,173,181 'price-feeds' 'prices/rates/quotes/gas':162 'probe':117 'prompt':191 'proof':109 'protocol':84 'rate':91 'readm':183 'render':186 'request':72,131,236 'request/response':203 'respond':219 'respons':243 'return':126,246 'rough':152 'schema':204 'sentiment api' 'sentiment-analysis' 'sentiment/summarize/classify/embeddings':160 'shape':244 'share':168 'simpli':98 'sinc':142 'span':54 'spec':201 'specif':115 'standard':128 'technic':195 'text-classification' 'text-summarization' 'thin':177 'unit':137 'usag':208 'usd':141 'usdc':9,28,75,139,143 'usdc api' 'usdc-base' 'use':144 'util':15,34,64,166 'valid':107 'validation' 'via':80 'wallet':190 'web3':61 'well':223 'well-form':222 'without':228 'x':102 'x-payment':101 'x402':43,82,129,225 'x402 api' 'x402-enabled':42 'x402-payment'","prices":[{"id":"1306425d-5009-46c3-9ded-e424ba738d35","listingId":"3a9ab4ea-c16c-47b5-83ab-f21de4079c4a","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/transfers/100","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T19:27:16.713Z"}],"sources":[{"listingId":"3a9ab4ea-c16c-47b5-83ab-f21de4079c4a","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/transfers/100","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T19:27:16.713Z","lastSeenAt":"2026-04-22T10:02:30.031Z"}],"details":{"listingId":"3a9ab4ea-c16c-47b5-83ab-f21de4079c4a","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/transfers/100 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-proof>\" \\\n  -d '{}'","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"Platform offers ~16 endpoints across data, AI, finance, and utility categories, all at $0.02/request","source_url":"https://lowpaymentfee.com"},{"claim":"No API keys, no rate limits, instant access, Base network","source_url":"https://lowpaymentfee.com"},{"claim":"x402 challenge returns maxAmountRequired of 20000 base units of USDC on Base (= $0.02)","source_url":"https://lowpaymentfee.com/api/v1/transfers/100"},{"claim":"Docs, pricing, API, and README pages render only 'Connect wallet'","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Querying real-time financial price feeds and exchange rates without an API key","Running AI inference tasks (sentiment, summarization, classification, embeddings) on a per-call basis","Accessing utility services like geocoding, validation, and data conversion with micropayments","Exporting data or generating analytics reports via pay-as-you-go endpoints"],"bestFor":["Developers wanting zero-signup, pay-per-use API access","Agents or bots that can settle payments in USDC on Base via x402","Prototyping or low-volume use cases where $0.02/request is cost-effective"],"notFor":["High-volume production workloads needing SLAs and guaranteed uptime documentation","Users who need detailed API documentation, request/response schemas, or SDKs before integrating"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:35.517Z"},"updatedAt":"2026-04-22T10:02:30.031Z"}}