{"id":"de007ddf-914a-4fbb-9ccf-4f0c91b71a0b","shortId":"uBMwjW","kind":"x402","title":"x402-gated API platform on Base offering data, AI, finance, and utility endpoints at $0.02/request.","tagline":"x402-gated API platform on Base offering data, AI, finance, and utility endpoints at $0.02/request.","description":"lowpaymentfee.com is an x402 protocol API platform that gates access to a collection of endpoints behind per-request USDC micropayments on the Base network. The specific endpoint at `/api/v1/policies/32` is listed as \"Premium API Access\" and accepts POST requests with payment via the x402 protocol. The x402 challenge confirms the endpoint is live and requires up to 20,000 base units of USDC (0.02 USD) per request, settled to a wallet on Base.\n\nThe platform advertises four categories of APIs: Data & Analytics (metrics, reports, data export, insights), AI & Machine Learning (sentiment analysis, text summarization, classification, embeddings), Finance & Web3 (price feeds, exchange rates, token quotes, gas estimates), and Infrastructure utilities (geocoding, validation, conversion, generation). All endpoints are listed at $0.02 per request with no API keys, no rate limits, and no minimum commitments required.\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 detailed documentation for any endpoint. The specific functionality behind `/api/v1/policies/32` (\"Premium API Access\") is unclear and may serve as a meta-endpoint or policy lookup rather than one of the advertised domain-specific APIs.","tags":[],"capabilities":["x402-payment","usdc-micropayment","base-network","per-request-billing","no-api-key","post-method","json-response"],"categories":["api-gateway","infrastructure"],"synonyms":["x402 API","micropayment API","pay-per-request API","USDC API access","Base network API","lowpaymentfee","low payment fee"],"warnings":["No API documentation available — docs, pricing, API, and README pages all show only 'Connect wallet'","No OpenAPI or schema definition for any endpoint","The specific functionality of /api/v1/policies/32 ('Premium API Access') is not explained anywhere","No request or response examples available"],"endpointUrl":"https://lowpaymentfee.com/api/v1/policies/32","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/32","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 network. However, there is no OpenAPI schema, no request/response examples, and all documentation pages are empty beyond a wallet-connect prompt. The specific purpose of /api/v1/policies/32 is 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'/request':17,34 '0.02':16,33,99,154 '000':94 '20':93 'Base network API' 'USDC API access' 'accept':72 'access':44,70,213 'advertis':111,232 'ai':10,27,123 'analysi':127 'analyt':117 'api':4,21,40,69,115,159,175,212,236 'base':7,24,58,95,108 'base-network' 'behind':50,209 'categori':113 'challeng':83 'classif':130 'collect':47 'commit':167 'confirm':84 'connect':184 'content':190 'convers':147 'data':9,26,116,120 'detail':201 'doc':174 'document':169,202 'domain':234 'domain-specif':233 'embed':131 'endpoint':14,31,49,62,86,150,205,223 'estim':141 'exampl':198 'exchang':136 'export':121 'extrem':171 'feed':135 'financ':11,28,132 'four':112 'function':208 'gas':140 'gate':3,20,43 'generat':148 'geocod':145 'infrastructur':143 'insight':122 'json-response' 'key':160 'learn':125 'limit':163 'list':66,152 'live':88 'lookup':226 'low payment fee' 'lowpaymentfee' 'lowpaymentfee.com':35 'machin':124 'may':217 'meta':222 'meta-endpoint':221 'metric':118 'micropay':55 'micropayment API' 'minimum':166 'network':59 'no-api-key' 'offer':8,25 'one':229 'openapi':194 'page':179 'pay-per-request API' 'payment':76 'per':52,101,155 'per-request':51 'per-request-billing' 'platform':5,22,41,110 'polici':225 'post':73 'post-method' 'premium':68,211 'price':134,176 'prompt':186 'protocol':39,80 'quot':139 'rate':137,162 'rather':227 'readm':178 'render':181 'report':119 'request':53,74,102,156 'request/response':197 'requir':90,168 'schema':195 'sentiment':126 'serv':218 'settl':103 'spars':172 'specif':61,207,235 'summar':129 'text':128 'token':138 'unclear':215 'unit':96 'usd':100 'usdc':54,98 'usdc-micropayment' 'util':13,30,144 'valid':146 'via':77 'wallet':106,185 'web3':133 'x402':2,19,38,79,82 'x402 API' 'x402-gated':1,18 'x402-payment'","prices":[{"id":"3848bf3a-e1e3-49af-8c39-ee7413771c82","listingId":"de007ddf-914a-4fbb-9ccf-4f0c91b71a0b","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/32","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:51:53.512Z"}],"sources":[{"listingId":"de007ddf-914a-4fbb-9ccf-4f0c91b71a0b","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/policies/32","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:51:53.512Z","lastSeenAt":"2026-04-23T08:01:37.351Z"}],"details":{"listingId":"de007ddf-914a-4fbb-9ccf-4f0c91b71a0b","quickStartSnippet":"# The endpoint requires an x402 X-PAYMENT header with USDC on Base.\n# Using curl to see the payment challenge:\ncurl -X POST https://lowpaymentfee.com/api/v1/policies/32 \\\n  -H 'Content-Type: application/json'\n# Returns 402 with x402 challenge. Use an x402-compatible client to attach payment.","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"The endpoint returns a 402 x402 challenge requiring up to 20,000 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/policies/32"},{"claim":"USDC asset contract on Base: 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/policies/32"},{"claim":"All listed endpoints are priced at $0.02 per request with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"Platform offers APIs across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Accessing gated API endpoints with per-call USDC micropayments on Base","Agent-driven API consumption without pre-registration or API keys","Pay-as-you-go access to data, AI, finance, or utility services"],"bestFor":["Agents or developers wanting keyless, pay-per-call API access","x402-compatible clients on the Base network","Low-volume or exploratory API usage with no commitments"],"notFor":["Users needing detailed API documentation or schemas before integrating","High-volume production workloads requiring SLAs or guaranteed uptime","Users without USDC on the Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:02.829Z"},"updatedAt":"2026-04-23T08:01:37.351Z"}}