Is x402-proxy open source?

Yes. x402-proxy is open source under the Apache-2.0 license; the repository is https://github.com/cascade-protocol/x402-proxy. Checked as of 2026-10-21.

Which chains does x402-proxy support?

x402-proxy lists support for Base, Solana, Monad as of 2026-10-21.

Is x402-proxy still maintained?

The most recent code activity Sato Hub observed was on 2026-08-14 (last commit 2026-08-14, last release 2026-08-14), which Sato Hub labels "Recent". Posts on X are not counted as maintenance. Activity is a recency signal, not a quality judgment.

How do I install or run x402-proxy?

Node.js (npx CLI). Install: npm install x402-proxy && npx x402-proxy setup. Entry: npx x402-proxy . This is taken from the project's own documentation and has not been reproduced by Sato Hub. It runs as an MCP server (npx x402-proxy mcp — or mcpServers config: {"command":"npx","args":["-y","x402-proxy","mcp"," "]}).

Is x402-proxy verified on Sato Hub?

No independent verification is on record for x402-proxy; its verification status is "Unverified" and its Sato Score is 53 of 100. Self-reported is not verified, and the score is not a safety, quality or returns grade.

Developer Tool

x402-proxy

CLI and MCP proxy that auto-pays x402/MPP-gated endpoints on Base, Solana, Monad, and Tempo from one mnemonic.

Sato Score53
ChainsBase, Solana +1

ActiveUnverifiedRecent · 2mo ago

x402-proxy is an open-source developer tool on Base, Solana and Monad, with last code activity on 2026-08-14 (Recent). Latest release on 2026-08-14. Sato Score 53/100 (how open, active and verifiable it is, not a safety grade), as of 2026-10-21. How the score works →

See how to install x402-proxy →

Last commit Aug 14, 2026 · Last release Aug 14, 2026 (v0.12.3) · ★ 10

Listed from github.com/cascade-protocol/x402-proxy on 2026-07-19. Install: not attempted. Evidence →

Website ↗GitHub ↗

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One email if what we observe changes — its repo goes quiet or disappears, or the listing is retired. Nothing else.

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Run Sato Hub Preflight on cascade-protocol/x402-proxy before I use it.

Full setup: Claude Code, Cursor, others →

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Overview

x402-proxy is described by its own README as "curl for x402 and MPP paid APIs" — a CLI and MCP proxy that derives EVM and Solana keypairs from a single BIP-39 mnemonic and handles both one-time and streaming payments automatically. An agent builder drops it in front of any x402-gated endpoint to remove the need to write payment-signing code per chain.

Sato Score

53/100· Medium

How open, active & verifiable — not a safety or returns grade.

Maintenance & liveness: 25/35
Code transparency: 18/20
Interface verifiability: 0/10
Docs & demo: 0/10
Listing transparency & provenance: 8/15
Independent verification: 2/10

View verification & embed badge →History →How the Sato Score works

Sato Check

v0.12.3 · as of 2026-09-29

Does it take your key?: Reads a key
Does your key leave?: Not yet run
Can it move funds on its own?: Unknown

Full profile, evidence and limits →

A profile describes what we read and ran, with dates. It is not a safety rating, an audit or an endorsement, and "not found" is not "not there".

Evidence — listed vs checked · what the words mean

Listed from github.com/cascade-protocol/x402-proxy on 2026-07-19. Install: not attempted.

Claim	Value	Evidence	Source	Checked
Chains supported	Base, Solana, Monad	self-reported	github.com/cascade-protocol/x402-proxy	as of 2026-10-21
Verification status	Unverified — not independently reviewed	self-reported	github.com/cascade-protocol/x402-proxy	as of 2026-10-21
Recent activity	last release 2026-08-14 · last commit 2026-08-14	observed	github.com/cascade-protocol/x402-proxy	2026-10-21
Install works	documented by the project, not run by Sato Hubnot attempted: no falsifiable install+entry probe from deploy_spec	self-reported	github.com/cascade-protocol/x402-proxy	as of 2026-09-14
Website answers	answered (HTTP 200)	observed	github.com/cascade-protocol/x402-proxy	2026-10-21
Daily check record	89 of 90 daily checks since 2026-07-23 succeededa success rate of our checks, not uptime; the source is this listing's own history	observed	—	2026-10-20
Takes your key	reads private-key material	traced	satohub.ai	2026-09-29
Key leaves the machine	not yet run with planted test keysthe sandbox lane has not run on this version	observed	satohub.ai	not dated
Moves funds on its own	unknown — could not read what it exposes	traced	satohub.ai	2026-09-29
Deploys as	CLI, npm package, MCP proxy, Node.js libraryconfidence 0.80	self-reported	github.com/cascade-protocol/x402-proxy	as of 2026-07-22
Sato Score	53/100 (Medium)how open, active and verifiable — not a safety or quality grade	computed	satohub.ai	2026-10-21

Self-reported rows are the project’s own words, dated when we recorded them — not a check. Only reproduced and reviewed rows carry a mark. None of these rows is a safety or quality rating.

Install — not run by us — no falsifiable install+entry probe from deploy_spec

Runtime: Node.js (npx CLI)

npm install x402-proxy
npx x402-proxy setup
npx x402-proxy <url>

MCP invocation: npx x402-proxy mcp <mcp-endpoint-url> — or mcpServers config: {"command":"npx","args":["-y","x402-proxy","mcp","<mcp-endpoint-url>"]}

Read from the project’s own docs as of 2026-09-14. What a deploy spec is →

Observed record — 91 daily checks since 2026-07-23

98.9%of 91 checks since 2026-07-23 succeeded

Currently responding for 37 days

Succeeded: 90
Failed: 1
Their error: 0
Unattributed: 1

State changed on 2026-09-14 (responding → unreachable from our probe), 2026-09-15 (unreachable from our probe → responding).

This is the share of our daily checks that succeeded — not an availability guarantee. A check can fail because the host was down, because our runner timed out, or because the network in between dropped it, and only the first of those is a fact about this project. Failures are split by what we can attribute; anything we cannot attribute is counted, not hidden. 40 of these checks predate 2026-09-01, when the probe counted a bot-block (HTTP 403) as a failure and recorded no reason for any failure. Every one of them passed, so the rate covers them too.

Last 30 days — to 2026-10-21, one point per UTC day

Share of OUR checks that succeeded

100%

7-day rolling; unattributable days are gaps · 30/30 days

Tools listed

fewer than 2 points—

from the server's own tools/list · 0/30 days

Sato Score

as snapshotted that day · 29/30 days

A gap is a day we have no attributable observation — never a zero. Thirty points is the whole shape the free layer carries; the daily rows behind it stay in the snapshot series.

Details

Chains: Base, Solana, Monad
Agent types: CLI / MCP payment proxy
Open source: Yes
Deploys as: CLI, npm package, MCP proxy, Node.js library
Last checked: 2026-10-21

Marketplace Signals

No marketplace signals recorded for this resource yet.

Verification status reflects evidence reviewed by Sato Hub. Self-reported claims are never presented as verified.

#x402#mcp#payments#cli#multichain

Where x402-proxy fits

Payments

Related concepts: How Agents Use Wallets, What Are Onchain Agents?

See something inaccurate or outdated?Submit a correction →

Recent Activity

All news →

Releases and posts from x402-proxy, pulled from its GitHub and X.

Releasecascade-protocol/x402-proxyAug 14, 2026

x402-proxy v0.12.3

Fixed Restore MPP payments. Every --protocol mpp request failed against current MPP servers with Payment verification failed: memo is not bound to this challenge. mppx >=0.6.28 derives the TIP-20 attribution memo's trailing nonce from keccak256(challengeId) and rejects any credential whose memo does not match, while the bundled mppx 0.5.1 still filled those bytes randomly. The memo version byte di

BaseSolanaMonad

GitHub ↗

Listing History

Recorded changes to x402-proxy's listing — status, verification, Sato Score, and recent releases. Full history is kept in the listing record.

Sep 26, 2026
Edited: entity class, resource type
Aug 14, 2026
New release published
Jul 24, 2026
Sato Hub began tracking this listing
Jul 22, 2026
Auto-enriched: deployment options
Jul 20, 2026
Edited: deploy spec
Jul 19, 2026
Listed on Sato Hub

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Reference

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Sato Hub. "x402-proxy — Sato Hub." Sato Hub, updated 2026-10-21, accessed 2026-10-21. https://satohub.ai/resources/x402-proxy-cascade

Data last refreshed 2026-10-21; this page is rebuilt daily. Citations carry the date so a reader can tell which snapshot a claim came from. Catalog data is licensed CC-BY-4.0.

x402-proxy

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Overview

Sato Score

Sato Check

Evidence — listed vs checked · what the words mean

Install — not run by us — no falsifiable install+entry probe from deploy_spec

Observed record — 91 daily checks since 2026-07-23

Last 30 days — to 2026-10-21, one point per UTC day

Details

Marketplace Signals

Where x402-proxy fits

Recent Activity

x402-proxy v0.12.3

Listing History

Compared with

Appears in

Related Resources

Coinbase AgentKit

Hyperliquid

Model Context Protocol (MCP)

Questions people ask about x402-proxy

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