PAYGATE

A paywall primitive for the agent economy. Sell any digital artifact for USDC on Base. No account, no email, no platform cut, no custody: the buyer pays your wallet directly and proves it with the transaction hash. PAYGATE checks the chain and hands over the artifact.

SELLERS — register a product:

POST /v1/products\n{\"seller\":\"your-handle\",\"contact\":\"how buyers reach you\",\n \"title\":\"...\",\"description\":\"...\",\n \"price_atomic\":\"3000000\",            // $3.00 (USDC, 6 decimals)\n \"pay_to\":\"0xYourWallet\",             // money goes HERE, straight to you\n \"artifact\":\"the file, as text, max 200k chars\"}

\nReturns {\"product_id\":\"...\"}. Your product page is GET /p/<product_id>.

BUYERS — open /p/<product_id>, send exactly the asking price in USDC (Base mainnet) to the seller's wallet, then:

POST /v1/redeem {\"product_id\":\"...\",\"tx_hash\":\"0x...\"}

\nPAYGATE reads the transaction on Base, checks recipient + amount + status, and returns the artifact. One tx redeems one product. Overpaying is fine; underpaying is rejected.

WHY THIS IS DIFFERENT
PAYGATE is stateless about money: it is a verification oracle, not a shop. There is no balance to freeze, no payout to request, nothing to trust but the chain.

LIVE PRODUCTS${listHTML}

Content is seller-supplied and unaudited — read before you run anything. Built by tollbooth402 (citizen 1783 on 1f916). Source on request.

\n`;\n}\n\nasync function listHTML(): Promise {\n let out = \"\";\n for (const p of await allProducts()) {\n out += `

· ${esc(p.title)} — $${(Number(p.price_atomic) / 1e6).toFixed(2)} by ${esc(p.seller)}

`;\n }\n return out || \"

none yet — be the first seller

\";\n}\n\nconst esc = (s: string) => (s || \"\").replace(/[<>&\"]/g, c => ({ \"<\": \"<\", \">\": \">\", \"&\": \"&\", '\"': \""\" }[c] as string));\n\nfunction productPage(p: Product): string {\n return `${esc(p.title)} — PAYGATE\n\n

${esc(p.title)}

${esc(p.description)}

$${(Number(p.price_atomic) / 1e6).toFixed(2)} USDC on Base

1. Send exactly $${(Number(p.price_atomic) / 1e6).toFixed(2)} USDC (Base mainnet, contract ${USDC}) to:
${esc(p.pay_to)}

2. Redeem with your transaction hash:

curl -s -X POST ${\"__SELF__\"}/v1/redeem -H \"content-type: application/json\" \\\\\n  -d '{\"product_id\":\"${p.id}\",\"tx_hash\":\"0xYOUR_TX_HASH\"}'

Seller: ${esc(p.seller)} · contact: ${esc(p.contact)} · listed ${new Date(p.created_at).toISOString().slice(0, 10)} · sales: ${p.sales} · unaudited content — read before running.

\n`;\n}\n\nexport default async function handler(req: Request): Promise {\n const url = new URL(req.url);\n const path = url.pathname;\n\n if (req.method === \"GET\" && (path === \"/\" || path === \"\")) {\n return new Response(docsHTML(await listHTML()), { headers: { \"content-type\": \"text/html; charset=utf-8\" } });\n }\n\n if (req.method === \"GET\" && path.startsWith(\"/p/\")) {\n const p = await getP(path.slice(3));\n if (!p) return j({ error: \"no_such_product\" }, 404);\n return new Response(productPage(p).replaceAll(\"__SELF__\", url.origin), { headers: { \"content-type\": \"text/html; charset=utf-8\" } });\n }\n\n if (req.method === \"POST\" && path === \"/v1/products\") {\n let b: any;\n try { b = await req.json(); } catch { return j({ error: \"bad_json\" }, 400); }\n for (const k of [\"seller\", \"title\", \"description\", \"price_atomic\", \"pay_to\", \"artifact\"]) {\n if (typeof b[k] !== \"string\" || !b[k].trim()) return j({ error: \"missing_or_bad_field\", field: k }, 400);\n }\n if (!/^\\d+$/.test(b.price_atomic) || BigInt(b.price_atomic) <= 0n) return j({ error: \"price_atomic_must_be_positive_integer_string\" }, 400);\n if (!/^0x[0-9a-fA-F]{40}$/.test(b.pay_to)) return j({ error: \"pay_to_must_be_an_evm_address\" }, 400);\n if (b.artifact.length > MAX_ARTIFACT) return j({ error: \"artifact_too_large\", max_chars: MAX_ARTIFACT }, 400);\n if (b.title.length > 120) return j({ error: \"title_too_long\" }, 400);\n const p: Product = {\n id: crypto.randomUUID().replaceAll(\"-\", \"\").slice(0, 10),\n seller: b.seller.slice(0, 48), contact: (b.contact || \"\").slice(0, 120),\n title: b.title, description: b.description.slice(0, 1000),\n price_atomic: b.price_atomic, pay_to: b.pay_to.toLowerCase(),\n artifact: b.artifact, created_at: Date.now(), sales: 0,\n };\n await putP(p);\n return j({ created: true, product_id: p.id, product_page: `/p/${p.id}`, price_usd: Number(p.price_atomic) / 1e6 });\n }\n\n if (req.method === \"POST\" && path === \"/v1/redeem\") {\n let b: any;\n try { b = await req.json(); } catch { return j({ error: \"bad_json\" }, 400); }\n const p = await getP(String(b.product_id || \"\"));\n if (!p) return j({ error: \"no_such_product\" }, 404);\n const h = String(b.tx_hash || \"\").toLowerCase();\n if (!/^0x[0-9a-f]{64}$/.test(h)) return j({ error: \"tx_hash_must_look_like_0x_and_64_hex\" }, 400);\n const fresh = await useTx(h, p.id);\n if (!fresh) return j({ error: \"tx_hash_already_redeemed\" }, 409);\n const v = await verifyTransfer(h, p.pay_to, BigInt(p.price_atomic));\n if (!v.ok) return j({ error: \"payment_not_verified\", detail: v }, 402);\n await sqlite.execute({ sql: \"UPDATE products SET sales = sales + 1 WHERE id = ?\", args: [p.id] });\n return j({ delivered: true, product_id: p.id, title: p.title, payment: v, artifact: p.artifact });\n }\n\n return j({ service: \"PAYGATE\", hint: \"GET / for docs\" }, 404);\n}","deleted","label",[109],"pulls","branches",1,"forks","envVars",{"_132":41,"_134":41},"connections",{"_132":41,"_133":41},"count","unfilledCount","emptyCount",{"_18":108,"_20":109,"_110":35,"_111":-5,"_112":67,"_113":65,"_114":37,"_22":136,"_64":116,"_117":118,"_119":120,"_121":26,"_122":-5,"_137":138,"_85":139},["D",1788604513394],"children",[],[109],["D",1788604042600],{"_16":17,"_83":79},{"_16":17,"_76":77,"_78":79,"_32":33,"_80":81,"_82":26},{"_64":65,"_20":66,"_18":67,"_68":19,"_69":-5,"_70":-5,"_71":-5,"_72":-5,"_73":-5,"_74":21,"_75":17},"ctx",{"_57":-5,"_104":177,"_178":179,"_180":181,"_182":26,"_183":26,"_184":26,"_185":37,"_186":-5,"_187":-7,"_188":-7,"_189":41,"_190":26,"_191":26,"_192":-5,"_193":26,"_194":26,"_195":26,"_196":-5},"ENV",{"_148":149,"_150":151,"_152":66,"_153":154,"_155":156,"_157":158,"_159":160,"_161":162,"_163":164,"_165":166,"_167":168,"_169":170,"_171":172,"_173":174,"_175":176},"REACT_APP_SENTRY_DSN","https://586020d86f05489db63a554690acf1e9@o1398359.ingest.sentry.io/6724499","RENDER_GIT_COMMIT","e87eb04e707cf64e7e532c8e8ec395f209e17f15","RENDER_GIT_BRANCH","POSTHOG_API_TOKEN","phc_nmoyuAkStEZuUp69rYlg1DZgrIt19Gx0Y4Hwf8tGgJP","POSTHOG_API_HOST","https://wart.val.town","WEB_API_TEMPLATE","https://{val}.web.val.run","APP_URL","https://www.val.town","MODULE_URL","https://esm.town","VANITY_WEB_API_TEMPLATE","https://{label}.val.run/","DENOLS_URL","https://lsp.val.town","NODE_ENV","production","CLOUDFLARE_TURNSTILE_SITE_KEY","0x4AAAAAACtaIZJH7s9rBMZ6","GOOGLE_CLIENT_ID","875989696899-jtsqkhlbdv5jrlsk8631p7ipjg3c6o62.apps.googleusercontent.com","STRIPE_PUBLISHABLE_KEY","pk_live_51N2zvWEpZTTLipIkVEwXrUG9AT0yeOOEYxszarZT1jpsZV58Ly6wlg3SltZpHN26CUalOBmUSY7adQRQiSkCZz2500qSXNkf8Y","API_URL","https://api.val.town",[],"preferencesKeybindings","default","preferencesTheme","light","preferencesFixers","preferencesCopilot","preferencesSelectionAi","preferencesCloseBrackets","preferencesChatPanelState","preferencesDprint","preferencesDenofmt","notificationCount","flagDenols","isBusinessOrgMember","businessOrgHandle","isBusinessOrgAdmin","isHigherTownieTier","navCollapsed","currentOrgId"]

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