SingIt lets AI agents pay for digital services without ever receiving wallet keys. CA: 0xc2c1e0b7C401e6217193732272444D928646eba3
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Joined January 2023
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Our x402 API now has a public usage counter. First 48 hours: 386 settled paid calls, 0.84 USDC in total, 0 failed settlements.
372 of them paid over Solana, 14 over Base. About $0.002 per call.
Tiny numbers, every one a settled payment. Which chain do your agents pay on?
The agent asked to spend $3. The cap said no.
Example setup: $5 a day, $2 per purchase. A $1.50 purchase goes through. A $3 purchase is refused, because it is above the $2 cap. On Base the limiter contract refuses it, not the model.
What daily cap would you give your agent?
Credit lines in USDC will be drawn by agents too.
Borrowed money changes the risk: an agent can now overspend money nobody has yet, so the per-agent limit matters more than the payment rail. Who should set it: the lender, the platform, or the owner?
SingIt Ask cleanup, done this week: all 31 operations in the live OpenAPI now have a verb-first summary, like "Get a cryptocurrency's USD price from Chainlink on Base". The spec passes the pay catalog check with 0 errors.
We also opened 3 catalog PRs: pay-skills, awesome-x402 and gold-402. None are merged yet.
Which directory do you check before you trust a new x402 endpoint?
More stablecoins on Base is good for agents. But a USDC cap says nothing about RLUSD: the agent just pays with whichever coin has no limit.
The allowance has to follow the agent, not the coin. Which coin would you cap first?
Stripe's agent design is now the per-purchase cap: inside the limit it spends, past it a human approves. The right primitive.
One rule decides everything: the agent can never raise its own limit. A cap it can talk past is not a cap. What's your number?
Stripe Crypto brings together everything needed to enable agentic commerce.
From stablecoins on @tempo to secure non-custodial wallets powered by @privy_io, here's what's powering Link balance for AI agents, starting with @instinct. View article
What SingIt has shipped so far:
MCP server 0.1.2, live in production.
Spending limits on Base and Solana, with Revoke.
Emergency stop on Base, and Solana allowance now has an emergency pause.
First real payment on Arc mainnet.
14 model routes in the x402 Bazaar.
What should an agent wallet ship next?
Per The Defiant: researchers gave frontier models a capped agent wallet plus the inbox that receives its one-time codes. Most models approved their own spending increase.
A cap the agent can approve isn't a cap. In SingIt the limit check doesn't run in the model: over the allowance, the payment is refused.
Source:
thedefiant.io/news/security/…
Building on Base, and we're applying to the Agents / x402 track.
SingIt puts AI agents on a budget. A contract on Base holds a daily cap and a per-purchase cap. Over the cap, the contract says no. Emergency stop pauses the allowance for good.
What should an agent never be allowed to spend?
Every demo of an agent completing a purchase skips the same scene: who set the budget.
The purchase works because a human picked a daily cap first, and the agent cannot raise it mid-task.
The scary part is not the $3,300, it is the keys that were already drained. Someone harvests keys faster than teams rotate them. An agent on a budget with daily and per-purchase caps, revocable anytime, loses at most the cap.
6.4 million agent payments in 35 days, and the average is under 2 cents.
A BeInCrypto count of x402 traffic on Base and Solana: $119,947 moved in total, 90.8% of payments below one cent.
That is machine commerce today: high frequency, tiny value. Nobody approves a one-cent payment by hand, and nobody hands an agent open money either. Caps are what make the next digit possible.
Your agent needs an LLM. It does not need your API keys.
Our x402 endpoint is open: Claude, GPT, Gemini, Grok, DeepSeek, Qwen and more behind one OpenAI-compatible API, paid per call in USDC on Base or Solana. Nothing is charged without an answer.
Just looking? The free tier gives 20 answers a day. No key, no payment.
Try it free:
curl ask.singitai.app/v1/chat/com… -H "Content-Type: application/json" -d '{"model":"free/deepseek-v4.1-flash","messages":[{"role":"user","content":"hi"}]}'
Models and pricing: ask.singitai.app/v1/models
Discovery: ask.singitai.app/.well-known…
SingIt retweeted
What we shipped this week, the unglamorous edition.
After the hackathon audience award earlier this week, I spent the week on plumbing instead of demos. Four PRs merged. Here is what changed and why it matters.
Every Base transaction we send now carries our ERC-8021 builder code, so Base can attribute the activity. The CDP SDK could not attach the suffix to USDC transfers, so we build those transfers by hand now. Each non-zero suffix byte costs 16 gas.
Wallet balances no longer depend on Alchemy's free tier: any Base RPC works, once we fixed a Cloudflare 403 caused by Python's default user agent. npm audit is green, 46 tests pass.
The hackathon took 30 hours. Making it dependable takes the weeks after. What did you ship this week?