{"id":"ec61fc45-9900-4b7e-9734-371836fee1b9","shortId":"Rm28yp","kind":"x402","title":"Turn any file into a public Swarm link — pay per-use with USDC via x402, no API keys needed.","tagline":"Turn any file into a public Swarm link — pay per-use with USDC via x402, no API keys needed.","description":"x402 Swarm Storage is a decentralized file hosting API that lets you upload any file (HTML, JSON, images, assets) up to 100 MB and receive a public, shareable gateway URL backed by Ethereum Swarm. The service abstracts away the complexity of purchasing Swarm postage stamps on Gnosis Chain; you simply pay with USDC on Base or Solana through the x402 payment protocol.\n\nThe workflow is two steps. First, POST to `/prepare` with a desired storage duration (1 day, 7 days, or 14 days). The endpoint returns a 402 Payment Required challenge; once the USDC payment is settled, you receive an encrypted `uploadToken` valid for 10 minutes. Second, POST your files as multipart form data to `/upload` along with the token. The server handles chunking, stamping, and uploading to Swarm, then returns a public URL of the form `https://{cid}.bzz.sh/{filename}`. The upload endpoint is idempotent — safe to retry on timeout.\n\nPricing is straightforward: $0.01 USDC for 1 day, $0.07 for 7 days, $0.12 for 2 weeks (per the OpenAPI spec; the landing page lists slightly higher prices of $0.04, $0.25, and $0.50 respectively — the live `/pricing` endpoint confirms the lower figures). No accounts or API keys are required; payment itself serves as authentication. A free `/pricing` GET endpoint returns current tiers. The service is designed for AI agents publishing inference results, temporary dashboards, or one-off visualizations.","tags":[],"capabilities":["decentralized-storage","file-upload","swarm-network","x402-payment","usdc-settlement","public-url-generation","multipart-upload","idempotent-retry","no-api-key","time-limited-hosting"],"categories":["storage","crypto"],"synonyms":["swarm storage","decentralized file hosting","bzz upload","temporary file hosting","swarm postage stamp","x402 file upload","IPFS alternative","content-addressed storage","agent file publishing"],"warnings":["Pricing inconsistency: the landing page lists $0.04 / $0.25 / $0.50 for 1d/7d/14d, but the OpenAPI spec and live /pricing endpoint return $0.01 / $0.07 / $0.12. The live endpoint is likely authoritative but verify before relying on prices.","The x402 challenge object returned in the probe was empty ({}), so the exact payment parameters (network, token address, amount in base units) could not be independently verified from the probe alone.","All uploaded content is publicly accessible — not suitable for sensitive data."],"endpointUrl":"https://x402.o8.is/prepare","protocol":"x402","transport":"http","auth":{"type":"x402","details":[{"asset":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","extra":{"name":"USD Coin","version":"2"},"payTo":"0xff365375777069ebd8fa575635eb31a0787afa6c","amount":"40000","scheme":"exact","network":"eip155:8453","maxTimeoutSeconds":300}]},"qualityScore":"0.820","qualityRationale":"Full OpenAPI 3.0 spec with three documented endpoints, live 402 challenge confirmed, and a working /pricing endpoint returning real data. Docs are thorough. Minor inconsistency between landing page prices and OpenAPI/pricing endpoint prices lowers the score 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'/pricing':226,246 '/upload':156 '0.01':194 '0.04':219 '0.07':199 '0.12':203 '0.25':220 '0.50':222 '1':117,197 '10':145 '100':62 '14':122 '2':205 '402':128 '7':119,201 'IPFS alternative' 'abstract':77 'account':233 'agent':258 'agent file publishing' 'ai':257 'along':157 'api':18,38,49,235 'asset':59 'authent':243 'away':78 'back':71 'base':95 'bzz upload' 'bzz.sh':179 'chain':88 'challeng':131 'chunk':164 'cid':178 'complex':80 'confirm':228 'content-addressed storage' 'current':250 'dashboard':263 'data':154 'day':118,120,123,198,202 'decentr':46 'decentralized file hosting' 'decentralized-storage' 'design':255 'desir':114 'durat':116 'encrypt':141 'endpoint':125,183,227,248 'ethereum':73 'figur':231 'file':3,23,47,55,150 'file-upload' 'filenam':180 'first':108 'form':153,177 'free':245 'gateway':69 'get':247 'gnosi':87 'handl':163 'higher':216 'host':48 'html':56 'idempot':185 'idempotent-retry' 'imag':58 'infer':260 'json':57 'key':19,39,236 'land':212 'let':51 'link':8,28 'list':214 'live':225 'lower':230 'mb':63 'minut':146 'multipart':152 'multipart-upload' 'need':20,40 'no-api-key' 'one':266 'one-off':265 'openapi':209 'page':213 'pay':9,29,91 'payment':101,129,135,239 'per':11,31,207 'per-us':10,30 'post':109,148 'postag':84 'price':191,217 'protocol':102 'public':6,26,67,173 'public-url-generation' 'publish':259 'purchas':82 'receiv':65,139 'requir':130,238 'respect':223 'result':261 'retri':188 'return':126,171,249 'safe':186 'second':147 'serv':241 'server':162 'servic':76,253 'settl':137 'shareabl':68 'simpli':90 'slight':215 'solana':97 'spec':210 'stamp':85,165 'step':107 'storag':43,115 'straightforward':193 'swarm':7,27,42,74,83,169 'swarm postage stamp' 'swarm storage' 'swarm-network' 'temporari':262 'temporary file hosting' 'tier':251 'time-limited-hosting' 'timeout':190 'token':160 'turn':1,21 'two':106 'upload':53,167,182 'uploadtoken':142 'url':70,174 'usdc':14,34,93,134,195 'usdc-settlement' 'use':12,32 'valid':143 'via':15,35 'visual':268 'week':206 'workflow':104 'x402':16,36,41,100 'x402 file upload' 'x402-payment'","prices":[{"id":"4f059360-184c-4631-9203-dabea010df0f","listingId":"ec61fc45-9900-4b7e-9734-371836fee1b9","amountUsd":null,"unit":"per_call","nativeCurrency":"USD COIN","nativeAmount":null,"chain":"base","payTo":"0xff365375777069ebd8fa575635eb31a0787afa6c","paymentMethod":"x402-usd coin","isPrimary":true,"details":{"scheme":"exact","accepts_all":[{"asset":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","extra":{"name":"USD Coin","version":"2"},"payTo":"0xff365375777069ebd8fa575635eb31a0787afa6c","amount":"40000","scheme":"exact","network":"eip155:8453","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-21T18:32:33.881Z"}],"sources":[{"listingId":"ec61fc45-9900-4b7e-9734-371836fee1b9","source":"x402_bazaar","sourceId":"https://x402.o8.is/prepare","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:33.881Z","lastSeenAt":"2026-04-22T04:02:49.108Z"}],"details":{"listingId":"ec61fc45-9900-4b7e-9734-371836fee1b9","quickStartSnippet":"# 1. Prepare (triggers x402 payment)\ncurl -X POST 'https://x402.o8.is/prepare?duration=1d' \\\n  --header 'PAYMENT-SIGNATURE: <x402_signature>'\n# Returns: {\"uploadToken\": \"...\", \"expiresAt\": \"...\"}\n\n# 2. Upload files\ncurl -X POST 'https://x402.o8.is/upload' \\\n  -F 'uploadToken=YOUR_TOKEN' \\\n  -F 'files=@index.html;type=text/html'","exampleRequest":{"url":"https://x402.o8.is/prepare?duration=7d","method":"POST","headers":{"PAYMENT-SIGNATURE":"<x402_v2_signature>"}},"exampleResponse":{"readyAt":"2025-07-15T12:00:00.000Z","success":true,"duration":"7d","expiresAt":"2025-07-15T12:10:00.000Z","uploadToken":"a1b2c3d4e5f6..."},"schema":null,"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"Pricing tiers from live endpoint: 1d=$0.01, 7d=$0.07, 14d=$0.12, max 100MB","source_url":"https://x402.o8.is/pricing"},{"claim":"Landing page lists different prices: 1d=$0.04, 7d=$0.25, 14d=$0.50","source_url":"https://x402.o8.is"},{"claim":"OpenAPI spec version 2.0.0 documents /prepare, /upload, and /pricing endpoints","source_url":"https://x402.o8.is/docs"},{"claim":"Upload endpoint is idempotent and retry-safe; token valid for 10 minutes","source_url":"https://x402.o8.is/docs"},{"claim":"Payment accepted in USDC on Base or Solana via x402 protocol","source_url":"https://x402.o8.is"},{"claim":"Files are stored on Ethereum Swarm with public gateway URLs of the form https://{cid}.bzz.sh/{filename}","source_url":"https://x402.o8.is/docs"}],"useCases":["Publishing AI inference results as shareable web pages","Hosting temporary dashboards or visualizations for a fixed duration","Uploading images or assets from an autonomous agent without managing credentials","Sharing one-off HTML reports or JSON payloads via a public link","Storing files on decentralized infrastructure with automatic expiry"],"bestFor":["AI agents that need to publish files without managing API keys","Temporary content hosting with automatic expiry (1–14 days)","Developers wanting Swarm storage without dealing with BZZ tokens or Gnosis Chain"],"notFor":["Long-term or permanent file storage beyond 14 days","Large files exceeding 100 MB","Private or access-controlled content (all uploads are public)"],"kindDetails":{},"updatedAt":"2026-04-22T01:09:47.596Z"}}