Openusdc
Open payment rails / x402 standard

A wallet for
every agent.

USDC payments in one line of code. Self-custodial, multi-chain, open standard.

Get startedRead the docs
Works withClaude·GPT·Gemini·LangChain·CrewAI
$0.0001
Run
$ curl https://api.openusdc.ai/v1/echo \    -H "Accept: text/x-402-payment" \    -d '{"prompt":"hello"}' 402 Payment RequiredX-USDC-Amount: 0.0042X-USDC-Chain: baseX-USDC-PayTo: 0xA1f3…7C2d ✓ Settled in 1.2s · receipt: ousdc_3f9a…
Connected · base-mainnetx402 · openusdc-gateway 0.6.2
Built on x402
Base· Solana· Arbitrum· Optimism
Use cases

The things your agents can buy when money is an API call.

A short list of what agents already do in production with Openusdc. Bring your own use case — the gateway doesn't care what the resource is, only that it's priced.

LLM inference

Call a paid LLM API

Your agent hits a metered inference endpoint and pays per token, with no API key issued in advance.

> agent.call("gpt-omni://summarize", { text })
Web scraping

Scrape rate-limited data

Pay 0.001 USDC per request to a content publisher's x402 endpoint and skip the captcha gauntlet entirely.

> fetch("nyt://article/2026/05/12", { pay: true })
Agent-to-agent

Pay another agent

Agent-to-agent settlement with cryptographic receipts. No invoices, no chargebacks, no Stripe Connect.

> agent.pay("agent://research.bot", "0.10 USDC")
Commerce

Buy a domain

Your shopping agent purchases the .com it just brainstormed for you, settles in stablecoin, hands you the keys.

> agent.buy("opencharm.ai", "12.00 USDC")
The new agent stack

What you stop building when payments are a protocol.

Agents shouldn't carry static API keys, fill in sign-up forms, or wait on Net-30 invoicing to be useful. Move the floor.

Old way
With Openusdc
Sign-up forms
→
USDC wallet address
API keys per service
→
One x402 endpoint
Stripe + KYC for agents
→
Open, permissionless rails
Net-30 invoicing
→
Instant on-chain settlement
Hardcoded rate limits
→
Pay-per-call pricing
How it works

Three steps from idea to first settled payment.

1

Drop in the gateway

One line of middleware turns any HTTP endpoint into a metered, USDC-priced resource. Express, Fastify, FastAPI, Go, Rust — all native.

$ app.use(openusdc.gateway({ price: "0.001 USDC" }))
2

Agents pay automatically

When the agent sees a 402, the SDK signs a payment, retries, and includes a receipt. Your code never sees the wallet plumbing.

$ const data = await openusdc.fetch(url)
3

See it on-chain

Every payment is a normal on-chain USDC transfer. Verify in any block explorer — no portal required.

$ curl https://api.openusdc.ai/v1/payments?since=24h
For agent developers

Give your agent a wallet, not an API key drawer.

  • Drop-in middleware for Node, Python, Go, Rust, Deno, and Cloudflare Workers
  • Policy-bound agent wallets with spend caps, allow-lists, and revocation
  • Signed payment receipts and idempotency keys on every settlement
  • Local sandbox with deterministic chain simulator for tests
Explore the agent SDK
Pricing

Pay as your agents pay.

No seats. No minimums. One simple rate per settled payment.

Usage
$0.05
per settled payment
  • Unlimited agents per workspace
  • All supported chains
  • First 100 payments free each month
Get started

High-volume? Talk to us — rates drop with sustained throughput.

FAQ

Questions builders ask.

Don't see yours? Open a thread in our community Discord or email support@openusdc.ai.

x402 is the HTTP 402 Payment Required status code, originally reserved in the HTTP spec and recently revived as a payment standard by Coinbase and a community of contributors. It lets any server quote a price for a resource and any client (especially an AI agent) pay that price programmatically in seconds, without API keys or contracts. Openusdc is the open-source reference gateway and SDK suite for x402 over USDC.

Give your agents
money.

The first 100 payments per workspace per month are free. Get started in minutes.

Get startedTalk to us