{"id":"a5b5b156-80af-40dd-bec7-c2db8863b52f","shortId":"uUbYyN","kind":"x402","title":"x402-gated premium API access on Base, pay $0.02 per request in USDC.","tagline":"x402-gated premium API access on Base, pay $0.02 per request in USDC.","description":"This endpoint at lowpaymentfee.com is part of a broader platform offering pay-per-request APIs across data & analytics, AI & machine learning, finance & Web3, and infrastructure categories. The specific endpoint `/api/v1/policies/48` is labeled \"Premium API Access\" and is gated via the x402 protocol on the Base network. Payment is in USDC (contract 0x8335…2913) at a maximum cost of $0.02 per request (20,000 base units with 6 decimals).\n\nThe platform advertises a simple pricing model: $0.02 per request with no API keys, no rate limits, no minimums, and instant access. Other endpoints on the same domain cover metrics, reports, data export, insights, sentiment analysis, text summarization, classification, embeddings, price feeds, exchange rates, token quotes, gas estimates, geocoding, validation, conversion, and generation. However, the specific functionality behind `/api/v1/policies/48` (\"Premium API Access\") is not documented beyond its title. The probe confirms the endpoint is live, returning a valid 402 challenge with x402 version 1.\n\nDocumentation on the site 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, and no usage examples available. Prospective users should be aware that the actual behavior of this particular endpoint is unclear from available materials.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","pay-per-request","json-response","no-api-key"],"categories":["api-gateway","infrastructure"],"synonyms":["premium API","paid API access","x402 endpoint","USDC API","Base network API","lowpaymentfee","micropayment API"],"warnings":["The specific functionality of /api/v1/policies/48 ('Premium API Access') is not documented anywhere in the crawled material.","All documentation pages (docs, API, pricing, README) render only 'Connect wallet' with no technical content.","No OpenAPI spec, request schema, or response schema is available.","No example requests or responses can be constructed from available information."],"endpointUrl":"https://lowpaymentfee.com/api/v1/policies/48","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/48","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.250","qualityRationale":"The endpoint is confirmed live via a valid 402 challenge, but there is no documentation, no OpenAPI schema, no request/response examples, and the actual functionality behind 'Premium API Access' at /api/v1/policies/48 is entirely undocumented. This is effectively a stub 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'0.02':10,24,88,105 '000':92 '0x8335':81 '1':181 '20':91 '2913':82 '402':176 '6':96 'Base network API' 'USDC API' 'access':6,20,64,119,159 'across':45 'actual':228 'advertis':100 'ai':48 'analysi':133 'analyt':47 'api':5,19,44,63,110,158,191 'avail':220,237 'awar':225 'base':8,22,74,93 'base-network' 'behavior':229 'behind':155 'beyond':163 'broader':37 'categori':55 'challeng':177 'classif':136 'confirm':168 'connect':200 'contract':80 'convers':148 'cost':86 'cover':126 'data':46,129 'decim':97 'detail':207 'doc':190 'document':162,182 'domain':125 'embed':137 'endpoint':30,58,121,170,233 'estim':145 'exampl':219 'exchang':140 'export':130 'extrem':187 'feed':139 'financ':51 'function':154 'gas':144 'gate':3,17,67 'generat':150 'geocod':146 'howev':151 'infrastructur':54 'insight':131 'instant':118 'json-response' 'key':111 'label':61 'learn':50 'limit':114 'live':172 'lowpaymentfee' 'lowpaymentfee.com':32 'machin':49 'materi':238 'maximum':85 'metric':127 'micropayment API' 'minimum':116 'model':104 'network':75 'no-api-key' 'offer':39 'openapi':211 'page':195 'paid API access' 'part':34 'particular':232 'pay':9,23,41 'pay-per-request':40 'payment':76 'per':11,25,42,89,106 'platform':38,99 'premium':4,18,62,157 'premium API' 'price':103,138,192 'probe':167 'prompt':202 'prospect':221 'protocol':71 'quot':143 'rate':113,141 'readm':194 'render':197 'report':128 'request':12,26,43,90,107 'request/response':214 'return':173 'schema':215 'sentiment':132 'simpl':102 'site':185 'spars':188 'spec':212 'specif':57,153 'summar':135 'technic':206 'text':134 'titl':165 'token':142 'unclear':235 'unit':94 'usag':218 'usdc':14,28,79 'usdc-settlement' 'user':222 'valid':147,175 'version':180 'via':68 'wallet':201 'web3':52 'x402':2,16,70,179 'x402 endpoint' 'x402-gated':1,15 'x402-payment'","prices":[{"id":"15d3752d-5540-45af-85ad-6d30baeff3e8","listingId":"a5b5b156-80af-40dd-bec7-c2db8863b52f","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/48","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:51:49.322Z"}],"sources":[{"listingId":"a5b5b156-80af-40dd-bec7-c2db8863b52f","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/policies/48","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:51:49.322Z","lastSeenAt":"2026-04-23T08:01:37.160Z"}],"details":{"listingId":"a5b5b156-80af-40dd-bec7-c2db8863b52f","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/policies/48 \\\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":"Endpoint returns a valid x402 402 challenge with maxAmountRequired of 20000 in USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/policies/48"},{"claim":"Platform pricing is $0.02 per request with no API keys, no rate limits, no minimums","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/policies/48"}],"useCases":["Accessing gated API services without traditional API key registration","Making per-request micropayments in USDC on Base for premium data or services","Integrating pay-as-you-go API calls into autonomous agent workflows"],"bestFor":["Developers wanting keyless, pay-per-call API access","Agents that can settle x402 payments in USDC on Base","Users who prefer no-commitment, no-subscription API pricing"],"notFor":["Users who need detailed API documentation or OpenAPI specs before integrating","Applications requiring free or fiat-only payment methods"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:03.059Z"},"updatedAt":"2026-04-23T08:01:37.160Z"}}