The Stall
以下摘录自该仓库的 README(片段) · 在 GitHub 读完整 README →
Hosted pay-per-call capabilities for agents and developers over MCP and HTTP
x402. The live service currently exposes **301 paid capabilities** with no
subscription or STALL API key required.
> This repository is the public integration and discovery surface. It does not
> contain the seller backend, capability implementations, supplier logic,
> settlement internals, pricing machinery, commercial strategy, runtime data,
> or operating configuration.
Live endpoints
| Surface | URL |
|---|---|
| Service health | |
| Live catalog, prices, and schemas | |
| Streamable HTTP MCP | |
| Agent Card | |
| x402 discovery | |
| OpenAPI | |
| Payment methods | |
The live catalog and the unsigned challenge returned for a specific request are
authoritative. Do not sign using a price copied from a README, search result,
cached registry page, or earlier quote.
MCP connection
MCP discovery is free. A paid tool call that has not supplied a valid x402
payment returns an MCP error result containing the payment challenge; it does
not return paid content.
HTTP quote
The expected unsigned response is HTTP 402 with an x402 v2
PAYMENT-REQUIRED header. Current settlement is exact USDC on Base
(eip155:8453). See PAYMENT.md before authorizing a payment.
Buyer examples
The included buyer is deliberately buyer-controlled: it validates the network,
asset, STALL recipient, exact amount, authorization lifetime, tool identity,
and an operator-supplied USDC ceiling before signing. Quote mode never loads a
signing key.
Read INTEGRATION.md for MCP and HTTP payment details. The
public/private boundary is documented in PUBLIC_BOUNDARY.md.
Coinbase Agentic Wallet CLI
This example uses Coinbase **Agentic Wallet** (awal), which is separate from
Coinbase **for Agents** equities MCP and its curated x402 catalog. STALL is not
listed in that equities catalog; this command uses the Agentic Wallet's own
USDC balance.
A Coinbase wallet agent can request a sourced check on a company's liquidity,
debt, and equity from the balance-sheet capability before an investment
decision. The result identifies its SEC EDGAR Companyfacts source, filing
periods, and retrieval time. It is filing data, not a trading recommendation.
First inspect the live catalog and the unsigned 402 quote above. After the
buyer has authenticated and set wallet spending limits, the Coinbase CLI
can make a bounded paid request with the same wallet: