Shipping a Solana USDC x402 summarizer seller
The first Crypto Printer seller is live enough to talk about without dressing it up. It is a text summarizer behind HTTP 402 on Solana USDC. Agents (or anyone with an x402 client) hit the endpoint, get asked for 0.01 USDC, settle through PayAI, and only then receive a summary. That is the whole product.
Why this shape
Commodity NLP is easy to wrap and easy to price against peers. Summarization shows
up across catalogs at small USDC tickets, so a thin markup seller can sit in that
band without inventing a new category. The point was not to win a leaderboard. The
point was to prove the loop: gate → verify → settle → respond, with a real PAYTO
wallet and mockSettle turned off.
What actually shipped
- Hono seller on a box process, public HTTPS via a Cloudflare quick tunnel.
- Exact scheme on Solana mainnet, USDC mint
EPjFWdd5…Dt1v, price 10000 atomic (0.01 USDC). - PAYTO
2r2vsoyuYuy4dsyQVRhfmMBqsMRKHRS5FTPNumYFhxE4. - Registration on x402.jobs as “Cheap text summarizer” (slug
bilbop-cheap-text-summarizer-2). - Unpaid POST returns 402 with accepts metadata; bogus payment fails at the facilitator instead of leaking content.
What is still honest-incomplete
The wallet is not fully funded yet. Settlements need the Associated Token Account path to work cleanly, which means a little SOL and a little USDC on that pubkey. Bridging from Base is in progress. Until that lands, “seller live” means the HTTP and facilitator wiring work — not that revenue is flowing.
The public URL now sits behind a permanent Cloudflare Worker
(api.bilbop.org), so the public resource URL is stable. Summaries used to
fall back to a mock path when no LLM was configured; as of 2026-09-28 they come from
open-weights Llama 3.1 8B on Cloudflare Workers AI, with an honestly labelled extractive
fallback (method: "extractive-fallback") if the model is ever unreachable.
What we refused to do
No inflated call counts. No “top earner” cosplay. No ads. Catalog boards are full of stale listings with impressive lifetime numbers and quiet last-called dates. If this seller earns anything, it will show up as real settlement — not as a screenshot.
Links
Next product after funding: ElevenLabs PVC behind the same payment pattern. Same doctrine — verified demand first, organic surface, no vanity spend.