Directory
Everything on this site
Everything public on this site in one place — tools you can click, guides in learning order, and machine endpoints agents can fetch.
Interactive tools
Things you can run in the browser right now — no account.
Payment loop walkthrough
See a live 402, read the tag, dry-run, quiz, free educational certificate.
/loop
Ship generator
Paste-ready Express / Next / Hono x402 middleware from your wallet + price.
/ship
402 Checker
Paste any API URL; grades the HTTP 402 body for agent readiness (A–F).
/check
Balance explorer
Paste a public Solana address → live SOL balance, USD estimate, recent txs.
/explorer
Practice wallet
Browser-only Solana wallet: create, backup, send/receive, x402 lab (Devnet first).
/app
Donate
Optional tip; suggested 0.01/0.05/0.25 SOL; >0.25 gets special thank-you. Human QR + agent x402 receipt.
/donate
Site pages
Core navigation — learning hub, wallet story, agents, about.
Home
Outcome hero + copyable agent prompt. Section: You and your agent learn x402 together (query cards).
/
Learn hub
Beginner → advanced path, payment loop, links into every guide.
/learn
Tools directory
Human-readable list of every public tool, page, guide, and API on this site.
/tools
Wallet explainer
Marketing page for the practice wallet (keys stay client-side).
/wallet
Where agents learn x402
How to get your agent paying on Solana; fetch order; buyer vs seller; safety + curriculum.
/agents
About
Independence notice, what we are / are not, no financial advice.
/about
Guides · beginner → advanced
Read in order if you are new. Each card is one plain-English lesson.
Beginner
What is x402?
HTTP 402 pay-per-request in plain English.
/guides/what-is-x402
First Solana wallet
Devnet practice keys, public vs private, no real funds.
/guides/first-solana-wallet
What is an RPC?
RPC ≠ paywall ≠ facilitator — mental model for builders.
/guides/what-is-an-rpc
Reading a Solana tx
Signatures, Solscan, balance changes as payment proof.
/guides/reading-solana-tx
Intermediate
Facilitators explained
Who verifies/settles 402 payments (CDP, PayAI, self-host).
/guides/facilitators-explained
Test an x402 endpoint
Read the 402 body; fix common setup mistakes.
/guides/test-x402-endpoint
Ship an x402 API on Solana
Protect a route, test 402, mainnet facilitators.
/guides/ship-x402-api-solana
x402 v1 vs v2
CAIP-2, resource, amount, headers — don’t crash testers.
/guides/x402-v1-vs-v2
x402 vs Stripe MPP
Rails, sessions, fees — when to use which.
/guides/x402-vs-mpp
Blind transfer problem
Why a bare address is not a payment API; x402 fixes it.
/guides/blind-transfer-problem
Advanced
Can AI agents spend money?
Yes with guardrails; per-request spend via 402.
/guides/can-ai-agents-spend-money
x402 vs token-gating
Pay-per-request vs membership checks for agents.
/guides/x402-vs-token-gating
Agent wallet safely
Spend limits, allowlists, dry-run, separate keys.
/guides/agent-wallet-safely
Why agent-readable matters
llms.txt, curriculum, well-known cards, live 402s.
/guides/agent-readable
HTTP 402 history
30 years dormant → agent payment layer.
/guides/http-402-history
Public APIs
JSON / plain text endpoints. Free. Rate-limited where needed.
Agent curriculum
JSON safety rules + process steps for teaching humans safely.
/api/agents/curriculum
Site digest (text)
This whole public catalog as one plain-text file for LLMs.
/api/agents/digest
Site catalog (JSON)
Structured JSON of every public tool/page/guide/api.
/api/agents/site
x402 lab
Educational 402 (v2 envelope, exact-lab). No real money required.
/api/x402/lab
x402 donate
Optional tip 402 (required=false). tipSuggestedSol=[0.01,0.05,0.25]; customary=0.05; >0.25→generous thank-you.
/api/x402/donate
Check 402 API
Body: {"url":"https://..."}. Grades 402. SSRF-hardened.
/api/check-402
Wallet lookup API
address + network → balance SOL/USD + recent transactions. Public data only.
/api/wallet/lookup
For AI agents · one-file first stop
Agents should fetch a single condensed file before crawling HTML.
Start here: /site.txt
Hyper-condensed plain text of every public tool, page, guide, API, and safety rule. One request → full gist. Same body also at /api/agents/digest. Structured twin: /api/agents/site (JSON).
site.txt
FIRST STOP for agents: hyper-condensed public surface of the whole site.
/site.txt
llms.txt
Short machine index; points here and to curriculum.
/llms.txt
agent-card.json
A2A-style agent card + x402 capabilities + optional tip convention.
/.well-known/agent-card.json
agent.json
Compact agent discovery alias.
/.well-known/agent.json
well-known x402
x402 discovery pointer for scanners.
/.well-known/x402
sitemap.xml
All indexable HTML URLs.
/sitemap.xml
robots.txt
Crawl rules; allows agents to fetch digests.
/robots.txt