{"id":"47e11df0-d6d7-4608-840a-ef226c046405","shortId":"bSH8Mw","kind":"x402","title":"Database snapshot (2023-03) accessible via x402 micropayment on Base for $0.02 per request.","tagline":"Database snapshot (2023-03) accessible via x402 micropayment on Base for $0.02 per request.","description":"This endpoint at lowpaymentfee.com provides access to a database snapshot dated 2023-03 via the x402 payment protocol. The endpoint is live and returns a 402 challenge requiring a USDC payment on the Base network. The price per request is $0.02 (20,000 base units of USDC with 6 decimals), settled on-chain to the specified payTo address. The response MIME type is application/json.\n\nlowpaymentfee.com hosts a broad catalog of pay-per-call APIs spanning data & analytics, AI/ML inference, finance/Web3, and infrastructure utilities — all priced uniformly at $0.02 per request with no API keys, no rate limits, and no commitments. This particular endpoint falls under the data category, serving a historical database snapshot for March 2023. The exact schema and contents of the snapshot are not documented in the crawled material, so callers should expect a JSON payload but cannot confirm its structure in advance.\n\nPayment is handled entirely via the x402 protocol: send a POST request with an X-PAYMENT header containing a valid payment proof for 20,000 units of USDC (contract 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base. The endpoint uses the \"exact\" payment scheme with a maximum timeout of 300 seconds. No OpenAPI spec, detailed documentation, or example responses were found during the crawl — the docs, pricing, and API pages all rendered only a \"Connect wallet\" prompt with no additional content.","tags":[],"capabilities":["database-snapshot","x402-payment","usdc-base","pay-per-request","json-response","historical-data"],"categories":["data","storage"],"synonyms":["database export","data snapshot","historical database","2023 data dump","database download","data archive","snapshot API"],"warnings":["No OpenAPI or schema documentation available — response structure is unknown","Docs, pricing, and API pages render only 'Connect wallet' with no useful content","The contents and schema of the '2023-03 database snapshot' are undocumented","No example requests or responses available to verify endpoint behavior"],"endpointUrl":"https://lowpaymentfee.com/api/v1/database/snapshots/2023-03","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/database/snapshots/2023-03","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. However, there is no OpenAPI spec, no documented request/response schema, no example payloads, and the docs/pricing/API pages are all behind a wallet-connect gate with no rendered content. The nature and structure of the 'database snapshot' is entirely 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'0.02':12,26,69,118 '000':71,201 '0x833589fcd6edb6e08f4c7c32d4f71b54bda02913':206 '20':70,200 '2023':3,17,40,146 '2023 data dump' '300':221 '402':54 '6':77 'access':5,19,34 'addit':251 'address':87 'advanc':175 'ai/ml':108 'analyt':107 'api':104,123,240 'application/json':93 'base':10,24,62,72,208 'broad':97 'call':103 'caller':163 'cannot':170 'catalog':98 'categori':138 'chain':82 'challeng':55 'commit':130 'confirm':171 'connect':246 'contain':194 'content':151,252 'contract':205 'crawl':160,235 'data':106,137 'data archive' 'data snapshot' 'databas':1,15,37,142 'database download' 'database export' 'database-snapshot' 'date':39 'decim':78 'detail':226 'doc':237 'document':157,227 'endpoint':30,48,133,210 'entir':179 'exact':148,213 'exampl':229 'expect':165 'fall':134 'finance/web3':110 'found':232 'handl':178 'header':193 'histor':141 'historical database' 'historical-data' 'host':95 'infer':109 'infrastructur':112 'json':167 'json-response' 'key':124 'limit':127 'live':50 'lowpaymentfee.com':32,94 'march':145 'materi':161 'maximum':218 'micropay':8,22 'mime':90 'network':63 'on-chain':80 'openapi':224 'page':241 'particular':132 'pay':101 'pay-per-cal':100 'pay-per-request' 'payload':168 'payment':45,59,176,192,197,214 'payto':86 'per':13,27,66,102,119 'post':186 'price':65,115,238 'prompt':248 'proof':198 'protocol':46,183 'provid':33 'rate':126 'render':243 'request':14,28,67,120,187 'requir':56 'respons':89,230 'return':52 'schema':149 'scheme':215 'second':222 'send':184 'serv':139 'settl':79 'snapshot':2,16,38,143,154 'snapshot API' 'span':105 'spec':225 'specifi':85 'structur':173 'timeout':219 'type':91 'uniform':116 'unit':73,202 'usdc':58,75,204 'usdc-base' 'use':211 'util':113 'valid':196 'via':6,20,42,180 'wallet':247 'x':191 'x-payment':190 'x402':7,21,44,182 'x402-payment'","prices":[{"id":"a9809f2a-0c23-45ab-8708-6f6eabed4973","listingId":"47e11df0-d6d7-4608-840a-ef226c046405","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/database/snapshots/2023-03","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-19T05:29:56.411Z"}],"sources":[{"listingId":"47e11df0-d6d7-4608-840a-ef226c046405","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/database/snapshots/2023-03","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-19T05:29:56.411Z","lastSeenAt":"2026-04-22T07:01:49.990Z"}],"details":{"listingId":"47e11df0-d6d7-4608-840a-ef226c046405","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/database/snapshots/2023-03 \\\n  -H \"X-PAYMENT: <x402-payment-proof>\" \\\n  -H \"Content-Type: application/json\"","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"Endpoint returns HTTP 402 with x402 challenge requiring USDC payment on Base","source_url":"https://lowpaymentfee.com/api/v1/database/snapshots/2023-03"},{"claim":"Price is $0.02 per request (20,000 base units USDC, 6 decimals)","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset contract is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/database/snapshots/2023-03"},{"claim":"All APIs priced at $0.02/request with no API keys, no rate limits, instant access","source_url":"https://lowpaymentfee.com"}],"useCases":["Retrieving a historical database snapshot from March 2023 for analysis","Programmatic access to archived data without API key management","Agent-driven data acquisition using on-chain micropayments"],"bestFor":["Agents or scripts that need one-shot access to a 2023-03 database snapshot","Developers who prefer keyless, pay-per-call API access on Base","Workflows requiring historical data without subscription commitments"],"notFor":["Users who need real-time or frequently updated data","Anyone requiring detailed schema documentation before purchasing","Use cases needing free or subscription-based access"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:24.259Z"},"updatedAt":"2026-04-22T07:01:49.990Z"}}