ReceiptRail

Name: ReceiptRail
Author: xka0085-byte

by xka0085-byteversion 0.3.0i★ –iRuns in the cloud

Registry nameio.github.xka0085-byte/receiptrail

Install

Overview

Description from the maker (original English)

Read-only on-chain receipt check for x402 payments; confirm settlement before trusting a tx.

PopNx MCP’s three pillars

These three are never merged into one score: opinions, measurements and popularity are different things.

User voiceiNo reviews yetReviews open together with accounts in a later step
Our basic checksi1 of 1 passedChecked from public information; code not scanned yet
UsageiNot measured yet★ –

What you can do with it

We have not written a plain-language summary for this one yet. Below are the facts we read from the registry.

Connection: Runs in the cloud
Transport: Streamable HTTP
Category: Crypto & blockchain

Install

Pick the AI app you use, then copy the settings.

Before you install

Basic checks: 1 of 1 passed
Runs on the maker’s server: what you ask it goes through their server.
The registry lists no key to fill in.

You need

Runs in the cloudNothing to install; it connects over the internet

Which app do you use?

ClaudeClaude CodeCursorVS CodeChatGPT

Pick your app above. We remember it, so next time the button says “Install in …”.

Works in Claude on the web, desktop and mobile:

Open Settings → Connectors
Press Add custom connector
Paste the address below and press Add
If it asks you to sign in, sign in with the maker

https://agenttoll-receipts.app.workbuddy.host/mcp

Run this in your terminal

claude mcp add --transport http receiptrail https://agenttoll-receipts.app.workbuddy.host/mcp

Open in Cursor

Or copy the settings yourself

Paste into .cursor/mcp.json in your project, or ~/.cursor/mcp.json

{
  "mcpServers": {
    "receiptrail": {
      "url": "https://agenttoll-receipts.app.workbuddy.host/mcp"
    }
  }
}

Your browser asks to open the app, then the app shows the settings and asks you to confirm. Key values are left empty for you to fill in.

Open in VS Code

Or copy the settings yourself

Paste into .vscode/mcp.json in your project

{
  "servers": {
    "receiptrail": {
      "type": "http",
      "url": "https://agenttoll-receipts.app.workbuddy.host/mcp"
    }
  }
}

Your browser asks to open the app, then the app shows the settings and asks you to confirm. Key values are left empty for you to fill in.

ChatGPT connects only to servers on the internet:

Open ChatGPT on the web → Settings → Connectors (Apps)
Press Create or Add (some plans need Developer mode under Advanced first)
Paste the address below, give it a name and save
If it asks you to sign in, sign in with the maker

https://agenttoll-receipts.app.workbuddy.host/mcp

Menu names can differ slightly by plan and over time.

Your choice stays on this device in a cookie; no account needed.

These settings are generated from the maker’s registry entry. If the README says otherwise, follow the README.

What it can do

We have not read this server’s tool list yet; we check endpoints in rotation.

Basic checksi

We check information anyone can see; we have not read the code. Checks that do not apply are left out of the count. · Checked Nov 8, 2026

✓ Pass
Maker matches the repo
The registry name was verified with the GitHub account xka0085-byte, which owns the repo
… Not checked yet
Still maintained
We have not read this repo from GitHub yet
… Not checked yet
Has a licence
We have not read this repo from GitHub yet
… Not checked yet
Endpoint responds
Not checked yet; we check endpoints in rotation
… Not checked yet
Sign-in with OAuth
Not checked yet; we check endpoints in rotation
… Not checked yet
No hidden instructions in tool descriptions
Not checked yet; we read the tool list when we check the endpoint

Compared with others in Crypto & blockchaini

More stars than 0% of the other 1613 servers in this category
Published to the registry more recently than 55% of the other 1613 servers in this category
Basic checks equal to or better than 100% of the other 1613 servers in this category

Compared with every active server in this category in the registry. Stars count only when the publisher owns the repo.

Common questions

Is ReceiptRail safe?

It passed 1 of 1 applicable basic checks. We have not read the code. Before adding a key or token, see what access the server asks for and use a key with only the permissions you need.

What keys or codes does it need?

The registry does not list a required key, though some servers ask you to sign in on first use.

Does it run on my computer or in the cloud?

It runs in the maker’s cloud. Connect over the internet with nothing to install, but what you send passes through the maker’s servers.

Is it still maintained?

The GitHub repo last changed –, and the latest version (0.3.0) reached the registry 39 days ago.

Which apps can use it?

Apps that support MCP, such as Claude Desktop, Claude Code, Cursor and VS Code. It connects by URL, so apps that accept remote MCP servers work too, such as ChatGPT in developer mode.

What can I use instead?

In the same category: Dinero en la Mesa — Perp DEX costs & funding, CryptoKeyhole, Cloud Wallet by Ekubo

Alternatives

Servers in the same category from other makers, sorted by stars.

Reading a card:★ GitHub starsiThree pillars: reviews · checks · usageiUpdated = latest version published to the registryi

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by dineroenlamesa.com

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Computer or cloudUpdated today

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CryptoKeyhole

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Runs in the cloudUpdated today

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Cloud Wallet by Ekubo

by EkuboProtocol

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README from the maker

Open the README

Copied from the maker’s repo as written. PopNx MCP has not reviewed or endorsed it. HTML, images and scripts are removed. Links lead off this site.

ReceiptRail (formerly AgentToll) — on-chain delivery receipts & official x402 receipt verification on Solana

⚠️ Official project notice / 身份声明: This is the official ReceiptRail repository, maintained by GitHub org xka0085-byte and npm account eidonze. We are NOT affiliated with agenttoll.dev, npm/agent-toll, agenttoll-mcp (Base), @agenttoll/sdk, 402.ad/AgentToll, or the "Receiptrail" accounting SaaS. Verify you are talking to this project by checking: MCP endpoint https://agenttoll-receipts.app.workbuddy.host/mcp · Official MCP Registry id io.github.xka0085-byte/receiptrail · npm package receiptrail-mcp (published by eidonze).

🔎 Early access (2 slots): I'll manually inspect your x402 endpoint's

payment-to-delivery path and send you a conformance report within 24h — $9/$19.

Details: https://x402-endpoint-inspection.app.workbuddy.host/

ReceiptRail is an on-chain delivery-receipt service for x402 AI-agent payments on Solana: after a settlement, sellers anchor a SHA-256 digest of the delivered content plus the settlement reference into a public PDA. Anyone — the buyer agent, an auditor, a regulator — can independently verify what was delivered, without trusting the vendor, the buyer, or any API we operate.

⚡ Live service (use it now)

Surface	Entry
MCP endpoint (streamable-http)	`https://agenttoll-receipts.app.workbuddy.host/mcp`
Official MCP Registry	`io.github.xka0085-byte/receiptrail`
npm (stdio MCP bridge)	`npx -y receiptrail-mcp`
Agent Card / SKILL.md / llms.txt	`/.well-known/agent-card.json` · `/SKILL.md` · `/llms.txt`
Pricing (0.001 USDC/receipt via x402)	https://agenttoll-receipts.app.workbuddy.host/
Tools	`issue_receipt` · `verify_receipt` · `get_receipt` · `verify_x402_receipt`

🆕 `verify_x402_receipt` — official x402 receipt-format verification (v0.3)

The x402 Foundation now ships a standard Signed Offers & Receipts extension (docs.x402.org/extensions/offer-receipt, npm @x402/extensions): servers sign an offer on every 402 and a receipt on every 200 — portable proof-of-interaction artifacts for reputation, auditing and disputes.

ReceiptRail is a Solana-side verification node for that format: our MCP tool verify_x402_receipt validates any official-format receipt artifact (JWS with EdDSA/Ed25519 — Solana-native — or ES256/P-256), resolves the signer key automatically from did:key / did:web / did:jwk, enforces freshness and payload assertions, and anchors verification results on-chain. Cross-verified against the official @x402/extensions verifier (same verdicts on valid and tampered artifacts — see receipts-service/test/cross-verify.mjs).

Keywords for agent discovery: x402 receipt, x402 offer-receipt, signed receipt verification, x402 dispute, delivery receipt, proof of delivery, proof of payment, Solana, USDC, MCP, AI-agent payments, verifiable settlement, agent reputation, on-chain audit.

Agent / Chain Evidence Tools — the suite

ReceiptRail is the flagship of a six-tool evidence suite (all read-only, no keys, JSON output):

Tool	What it checks / proves	Try
ReceiptRail	on-chain x402 delivery receipts (Solana)	live MCP endpoint
mcpdoctor	x402 payment endpoint & MCP server preflight	`npx @eidonze/mcpdoctor`
oauthdoctor	MCP OAuth discovery diagnostics	`npx oauthdoctor`
x402-reconcile	x402 402-challenge inspector	`npx x402-reconcile`
wallet-evidence	Solana transaction evidence reports	`npx wallet-evidence`
crosschain-incident	cross-chain message incident normalization	`npx crosschain-incident`

Live tools page: https://x402-endpoint-inspection.app.workbuddy.host/tools.html

AgentToll is the delivery-receipt protocol behind ReceiptRail. A vendor pins the SHA-256 digest of a report's exact bytes into a public PDA account on-chain. Anyone can independently recompute the digest from the delivered file and compare it against the chain, without trusting anyone.

"Don't trust what we say. Run the command."

Every capability claim in this README maps to a command in this repo and, where possible, a Solscan link on devnet.

Status: W1–W3 complete, independently audited (reports in audit/). Deployed on Solana devnet.

Program ID: 8ACN1KNEFXM2N2FMzxTfAzB1c3g5n47ZuhbPoUXPnCTp — view on Solscan
Receipt created by the recorded demo payment flow: delivery tx · payment tx

Honesty note: the demo uses test-USDC, a self-issued devnet mint with no real-world value. It is not real USDC. We say so everywhere, including in code output.

Why this exists

Machine-to-machine payments (the x402 pattern) are becoming real: agents pay per API call. But after an agent pays, it holds no trustworthy proof of *what* it received. Receipts, invoices, or hashes served by the vendor itself are indistinguishable from fabricated ones. AgentToll moves that proof to a neutral public ledger: the digest is written once, is tamper-evident (same id + different digest is rejected on-chain), and is verifiable offline forever.

Verify an existing receipt right now (no vendor involved)

cd verifier && npm install && cd ..

node verifier/verify.mjs \ --url https://api.devnet.solana.com \ --vendor B7wGaKwEGAmNP7PEhqwFrvfCQPH4zwiE7FZNLoeB4naD \ --report-id x402-demo-001 \ --file demo/report-402.json

Expected: JSON with "verdict": "PASS" and all five checks true (C1 ownership, C2 PDA derivation, C3 schema, C4 content binding, C5 freshness). Exit code 0. Then tamper with the file (add one byte) and rerun — C4 fails, exit code 1. That mismatch is the product.

Architecture

sequenceDiagram

participant B as Buyer agent participant V as Vendor HTTP service participant S as Solana devnet participant C as Offline verifier B->>V: GET /report/x402-demo-001 V-->>B: HTTP 402 + payment challenge B->>S: SPL transferChecked (test-USDC) B->>V: POST + X-Payment-Signature V->>S: getParsedTransaction, verify payment V->>S: create_receipt(report_id, SHA-256) V-->>B: report bytes + receipt metadata B->>C: Spawn verifier with local report C->>S: Read receipt PDA via public RPC C-->>B: C1-C5 PASS/FAIL JSON

The on-chain program enforces the anti-tamper rule at the ledger level: a PDA seeded by (vendor, report_id) can be created once; re-creating with the same digest is idempotent, with a different digest fails with DigestConflict. Overwrites are impossible, not just discouraged.

Run the full x402 demo

Requires Node.js 22+, a devnet-funded vendor keypair, and the deployed program above.

# 0. install the single JS dependency set

cd verifier && npm install && cd ..

1. configure (bash example)

export AGENTTOLL_RPC_URL='https://api.devnet.solana.com' export AGENTTOLL_KEYPAIR='/absolute/path/to/vendor-keypair.json'

2. create test-USDC mint, fund buyer (idempotent)

node demo/setup.mjs

3. start vendor (localhost:8787)

node demo/vendor.mjs

4. unpaid request must be refused

curl -i http://127.0.0.1:8787/report/x402-demo-001 # → HTTP 402

5. run the buyer agent: pay → receive report+receipt → verify 5/5

node demo/buyer-agent.mjs

6. forged payment signatures must be rejected

curl -i -X POST -H 'X-Payment-Signature: not-a-real-signature' \ http://127.0.0.1:8787/report/x402-demo-001 # → HTTP 402, no report

demo/buyer-agent.mjs prints {payment_sig, receipt_tx, pda, verifier_verdict, checks} and exits 0 only if the spawned offline verifier passes all five checks.

On-chain program (W1)

Anchor 1.2.0, two instructions:

create_receipt(report_id, digest) — first call creates the PDA; same id + same digest is idempotent; same id + different digest → DigestConflict
verify_receipt(report_id, digest) — permissionless; emits a ReceiptVerified event

Build and test locally:

./build.sh        # = anchor build --arch v0

cargo test --all # 8 litesvm tests, incl. DigestConflict & idempotency

Audits

Every milestone was reviewed by an independent auditor that did not write the business code. Reports with command outputs and on-chain evidence:

audit/W1-2026-09-14.md — contract, 8/8 tests, devnet deployment
audit/W2-2026-09-14.md — offline verifier, tamper-detection e2e
audit/W3-2026-09-14.md — x402 flow, negative paths, idempotent replay

Scope & limitations (read before trusting anything)

test-USDC is self-issued on devnet; it stands in for a real stablecoin. No real value.
The demo serves one report id on localhost; it is a protocol demo, not a hosted service.
The on-chain receipt binds report_id + digest; the payment signature is linked via the demo flow, not stored on-chain (the frozen W1 schema has no such field). See W3 audit §findings.
A professional third-party security audit is on the roadmap and has not happened yet.

Disclosed prior work

This project was built for the Colosseum CWF hackathon. Per the rules, we disclose pre-existing development: t3n-recon-agent and z-tenant-recon — a TEE-based prototype implementing the same anti-tamper digest logic (same-id-different-digest rejection, independent verifier), from which the on-chain design was ported. All AgentToll commits, tests, and deployments happened during the competition window (first commit: 2026-09-14).

中文说明见 README.zh-CN.md。

Suite hub

Part of the Agent / Chain Evidence Tools suite — read-only, no-keys, no-payments diagnostics for AI agents on Web3.

ReceiptRail

Overview

PopNx MCP’s three pillars

What you can do with it

Install

Before you install

What it can do

Basic checksi

Maker matches the repo

Still maintained

Has a licence

Endpoint responds

Sign-in with OAuth

No hidden instructions in tool descriptions

Compared with others in Crypto & blockchaini

Common questions

Alternatives

Dinero en la Mesa — Perp DEX costs & funding

CryptoKeyhole

Cloud Wallet by Ekubo

README from the maker

ReceiptRail (formerly AgentToll) — on-chain delivery receipts & official x402 receipt verification on Solana

⚡ Live service (use it now)

🆕 verify_x402_receipt — official x402 receipt-format verification (v0.3)

Agent / Chain Evidence Tools — the suite

Why this exists

Verify an existing receipt right now (no vendor involved)

Architecture

Run the full x402 demo

1. configure (bash example)

2. create test-USDC mint, fund buyer (idempotent)

3. start vendor (localhost:8787)

4. unpaid request must be refused

5. run the buyer agent: pay → receive report+receipt → verify 5/5

6. forged payment signatures must be rejected

On-chain program (W1)

Audits

Scope & limitations (read before trusting anything)

Disclosed prior work

Suite hub

🆕 `verify_x402_receipt` — official x402 receipt-format verification (v0.3)