Roundhouse

api.pennyforge.org

Paste a wallet address and the chain you are about to send on. SendCheck checks the EIP-55 checksum, whether the address is actually active on that network, EOA or contract, native + USDC + USDT balances — and flags the USDT-instead-of-USDC trap. Every check is shareable: the link re-verifies live in the viewer

OtherLiveeip155:8453Exactvia wellknown:sendcheck-x402.pennyforge.workers.dev
https://api.pennyforge.org/check
Calls · 30d
2
This endpoint's own trailing-30-day call count, as published by the upstream catalog and snapshotted daily. 16 snapshots so far.
$0.50
Verified settled volume
43 settlements proven x402 by their on-chain EIP-3009 marker.
$0.010
Listed price
As published in the catalog. Always read the live 402 before paying.
—
Calls · 30d
Upstream's own call count for this endpoint, not ours.
—
Unique payers · 30d
Never called
—
Upstream on-chain volume
Reported by the source catalog.
Paid to
0x9504A5939AB5be2B2B1F8beA7D7ebeCcd96c485D

The wallet the 402 directs payment to. Its whole payment record — every payer, every chain — is on the merchant page.

Asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913

Provider

The payTo wallet does not resolve to a registered ERC-8004 agent. That is not a verdict on the service — most of the catalog is unregistered.

Accepts

The payment requirements as published to the catalog. Read the live 402 before paying — a price here is a claim, not a quote.

0.01USDC≈ $0.01 USD
on Base · exact scheme

Pay 0.01 USDC on Base to 0x9504…c485D. The signed payment is good for 1 minute.

Paid to
0x9504…c485D
USD Coin contract
0x8335…02913
Payment window
1 minute
As published
10000 smallest units
Buys
Pre-send verification of one EVM address on one chain: EIP-55 checksum status, wallet-vs-contract, outgoing transaction count, native/USDC/USDT balances, and a leveled verdict (ok/caution/warn/danger) with reasons and next action. Run it before your agent sends funds to an address it pulled from an LLM answer, a message, or a scraped page.
Returns
application/json
The catalog’s raw entry
[
  {
    "asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
    "payTo": "0x9504A5939AB5be2B2B1F8beA7D7ebeCcd96c485D",
    "amount": "10000",
    "scheme": "exact",
    "network": "eip155:8453",
    "mimeType": "application/json",
    "description": "Pre-send verification of one EVM address on one chain: EIP-55 checksum status, wallet-vs-contract, outgoing transaction count, native/USDC/USDT balances, and a leveled verdict (ok/caution/warn/danger) with reasons and next action. Run it before your agent sends funds to an address it pulled from an LLM answer, a message, or a scraped page.",
    "outputSchema": {
      "type": "http",
      "input": {
        "body": {
          "chain": "base | ethereum | arbitrum | optimism | polygon (optional, default base)",
          "address": "string (0x + 40 hex chars, required)"
        },
        "method": "POST"
      },
      "output": {
        "chain": "{name, isContract, outgoingTxs, native, usdc, …}",
        "report": "copyable text report",
        "address": "0x… (normalized EIP-55)",
        "verdict": "{level, headline, next, gas, reasons}",
        "checksum": "{status, message}"
      }
    },
    "maxTimeoutSeconds": 60
  }
]

Provenance

Seen in the source catalog
—
Last indexed by Roundhouse
2026-09-21 01:15Z
Last enriched (probe, favicon, geo)
2026-09-21 01:45Z
x402 version
—
Max timeout
60s
Liveness probe
HTTP 405
Report

Hand this page to an agent

Copy the prompt and paste it into Claude, an MCP client or your own agent — it will vet this service and call it over the free read API. No key, no account.

GET api.roundhouseai.io/v0/endpoints

This endpoint's own trailing-30-day call count, as published by the upstream catalog and snapshotted daily. 16 snapshots so far. Verified volume counts only settlements with an on-chain EIP-3009 marker.

Open skill.md
Show the prompt
Using Roundhouse, look up the x402 service api.pennyforge.org and tell me whether it is
worth paying: what a call costs, whether the endpoint answered when last probed, and what
its payment record actually shows.

curl -s 'https://api.roundhouseai.io/v0/endpoints?q=api.pennyforge.org'
curl -s 'https://api.roundhouseai.io/v0/merchants/<the payTo wallet returned above>'

Then call it: read the price from the live 402 at https://api.pennyforge.org/check, never from
a cached figure, and pay with an x402 client.

The /v0 API needs an API key (`authorization: Bearer rh_live_…`) on everything except
/v0/unified* and /v0/endpoints. Mint a personal key for $0.01 at GET https://api.roundhouseai.io/v0/test/x402,
or use an organization key from https://roundhouseai.io/dashboard/team.

If you do not have Roundhouse tools or skills installed, read
https://roundhouseai.io/skill.md first — it is the whole procedure.