{"id":"d993be60-7486-432c-aa56-1250090df8ab","shortId":"jzHsVY","kind":"x402","title":"Pay-per-call API platform on Base network via x402 — $0.02/request in USDC, no API keys required.","tagline":"Pay-per-call API platform on Base network via x402 — $0.02/request in USDC, no API keys required.","description":"lowpaymentfee.com is an x402-enabled API platform that offers a broad set of endpoints spanning data analytics, AI/ML inference, finance/Web3 data, and utility services. All endpoints are paid per-request at $0.02 each using USDC on the Base network, with no API keys, rate limits, or upfront commitments required. Payment is handled inline via the x402 protocol's HTTP 402 challenge-response flow.\n\nThe specific endpoint at `/api/v1/accounts/3` is listed as \"Premium API Access\" and returns a 402 challenge requesting up to 20,000 base units of USDC (0x8335…2913 on Base), which equals $0.02 given USDC's 6 decimals. The endpoint accepts POST requests and returns `application/json`. The broader platform advertises additional categories including sentiment analysis, text summarization, classification, embeddings, price feeds, exchange rates, token quotes, gas estimates, geocoding, validation, conversion, and generation endpoints — all at the same $0.02 price point.\n\nDocumentation is extremely sparse. The /docs, /pricing, /api, and /README pages all render only a \"Connect wallet\" prompt with no further content. There is no OpenAPI spec, no request/response schema documentation, and no usage examples available from the crawl. The actual functionality behind the \"Premium API Access\" label at `/api/v1/accounts/3` is unclear — it could be an account data endpoint or something else entirely. Without documentation or example responses, the exact capabilities of this specific endpoint cannot be confirmed.","tags":[],"capabilities":["x402-payment","per-request-billing","usdc-base-network","json-api","no-api-key","post-method"],"categories":["api-platform","finance","ai"],"synonyms":["pay-per-call API","x402 API","micropayment API","USDC API","Base network API","low fee API","crypto-paid API"],"warnings":["No API documentation available — /docs, /pricing, /api, and /README all return only 'Connect wallet' with no content","No OpenAPI or schema definition found for any endpoint","The specific purpose and expected input/output of /api/v1/accounts/3 ('Premium API Access') is undocumented","The platform lists many endpoint categories but none have documented request/response formats"],"endpointUrl":"https://lowpaymentfee.com/api/v1/accounts/3","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/accounts/3","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 402 challenge with clear pricing ($0.02 USDC on Base). However, there is no OpenAPI spec, no request/response schema, no documentation beyond a wallet-connect prompt, and no examples. The purpose of '/api/v1/accounts/3' specifically is unclear. This is effectively a stub 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'/api/v1/accounts/3':109,233 '/docs':189 '/pricing':190 '/readme':193 '/request':13,32 '0.02':12,31,72,136,181 '000':125 '0x8335':130 '20':124 '2913':131 '402':100,119 '6':140 'Base network API' 'USDC API' 'accept':144 'access':115,230 'account':240 'actual':224 'addit':154 'advertis':153 'ai/ml':57 'analysi':158 'analyt':56 'api':5,17,24,36,45,82,114,229 'application/json':149 'avail':219 'base':8,27,78,126,133 'behind':226 'broad':50 'broader':151 'call':4,23 'cannot':259 'capabl':254 'categori':155 'challeng':102,120 'challenge-respons':101 'classif':161 'commit':88 'confirm':261 'connect':199 'content':205 'convers':173 'could':237 'crawl':222 'crypto-paid API' 'data':55,60,241 'decim':141 'document':184,214,248 'els':245 'embed':162 'enabl':44 'endpoint':53,65,107,143,176,242,258 'entir':246 'equal':135 'estim':170 'exact':253 'exampl':218,250 'exchang':165 'extrem':186 'feed':164 'finance/web3':59 'flow':104 'function':225 'gas':169 'generat':175 'geocod':171 'given':137 'handl':92 'http':99 'includ':156 'infer':58 'inlin':93 'json-api' 'key':18,37,83 'label':231 'limit':85 'list':111 'low fee API' 'lowpaymentfee.com':39 'micropayment API' 'network':9,28,79 'no-api-key' 'offer':48 'openapi':209 'page':194 'paid':67 'pay':2,21 'pay-per-cal':1,20 'pay-per-call API' 'payment':90 'per':3,22,69 'per-request':68 'per-request-billing' 'platform':6,25,46,152 'point':183 'post':145 'post-method' 'premium':113,228 'price':163,182 'prompt':201 'protocol':97 'quot':168 'rate':84,166 'render':196 'request':70,121,146 'request/response':212 'requir':19,38,89 'respons':103,251 'return':117,148 'schema':213 'sentiment':157 'servic':63 'set':51 'someth':244 'span':54 'spars':187 'spec':210 'specif':106,257 'summar':160 'text':159 'token':167 'unclear':235 'unit':127 'upfront':87 'usag':217 'usdc':15,34,75,129,138 'usdc-base-network' 'use':74 'util':62 'valid':172 'via':10,29,94 'wallet':200 'without':247 'x402':11,30,43,96 'x402 API' 'x402-enabled':42 'x402-payment'","prices":[{"id":"35151f4a-33b0-4d32-82e7-63335034c2db","listingId":"d993be60-7486-432c-aa56-1250090df8ab","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/accounts/3","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:39:28.717Z"}],"sources":[{"listingId":"d993be60-7486-432c-aa56-1250090df8ab","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/accounts/3","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:39:28.717Z","lastSeenAt":"2026-04-22T20:00:46.602Z"}],"details":{"listingId":"d993be60-7486-432c-aa56-1250090df8ab","quickStartSnippet":"# 1. Send a POST to get the 402 challenge:\ncurl -X POST https://lowpaymentfee.com/api/v1/accounts/3\n# 2. Parse the 402 JSON for payment details (payTo, asset, maxAmountRequired)\n# 3. Construct an x402 payment proof and resend with X-PAYMENT header:\ncurl -X POST https://lowpaymentfee.com/api/v1/accounts/3 \\\n  -H \"X-PAYMENT: <signed-payment-payload>\"","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, rate limits, or minimums","source_url":"https://lowpaymentfee.com"},{"claim":"Payment is in USDC on Base network (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913)","source_url":"https://lowpaymentfee.com/api/v1/accounts/3"},{"claim":"maxAmountRequired is 20000 base units (= $0.02 USDC with 6 decimals)","source_url":"https://lowpaymentfee.com/api/v1/accounts/3"},{"claim":"Endpoint accepts POST method and returns application/json","source_url":"https://lowpaymentfee.com/api/v1/accounts/3"},{"claim":"Platform offers endpoints across data/analytics, AI/ML, finance/Web3, and infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Agents that need on-demand API access without pre-registration or API key management","Programmatic access to data/analytics/AI endpoints with per-call USDC micropayments","Integrating x402-compatible payment flows into automated workflows"],"bestFor":["Developers or agents already holding USDC on Base who want frictionless API access","Use cases requiring no-signup, pay-as-you-go API consumption","Testing x402 protocol integrations with a live, inexpensive endpoint"],"notFor":["Users who need detailed API documentation or guaranteed SLAs before integrating","High-volume use cases where per-request pricing at $0.02 adds up versus subscription models","Anyone without a Base-network USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:38.793Z"},"updatedAt":"2026-04-22T20:00:46.602Z"}}