Nonprofit Verify

{
  "coverage": "Federal IRS bulk snapshots only. Exact name matching; no fuzzy search. IRS records can lag changes, and Pub 78 is not a complete list of every organization eligible to receive deductible gifts.",
  "data_as_of": {
    "bmf": "2026-09-07T00:00:00Z",
    "pub78": "2026-09-10T00:00:00Z",
    "revocation": "2026-09-12T00:00:00Z"
  },
  "organizations": [
    {
      "bmf_status": {
        "code": "01",
        "label": "Unconditional exemption"
      },
      "city": "Albany",
      "deductibility": {
        "code": "1",
        "label": "Contributions are deductible"
      },
      "ein": "000000001",
      "foundation": {
        "code": "15",
        "label": "Publicly supported organization"
      },
      "in_bmf": true,
      "name": "Example Foundation",
      "pub78": {
        "codes": [
          {
            "code": "PC",
            "label": "Public charity"
          }
        ],
        "listed": true
      },
      "revocations": [],
      "revoked": false,
      "ruling": "2000-01",
      "state": "NY",
      "subsection": {
        "code": "03",
        "label": "501(c)(3)"
      },
      "zip": "12201"
    }
  ],
  "source": "Internal Revenue Service (IRS) Exempt Organizations Business Master File, Pub 78, and automatic revocation data",
  "truncated": false
}

# bash or zsh: see the payment challenge. Nothing is charged.
curl -sS -g -i -X POST 'https://api.flipvo.com/v1/nonprofit/verify' \
  -H 'content-type: application/json' \
  --data-raw '{"ein":"12-3456789"}'

# x402 v2 sends the challenge base64-encoded in the PAYMENT-REQUIRED header (v1 sends it in the body).
# To read the header:
curl -sS -g -o /dev/null -D - -X POST 'https://api.flipvo.com/v1/nonprofit/verify' \
  -H 'content-type: application/json' \
  --data-raw '{"ein":"12-3456789"}' \
  | grep -i '^payment-required:' | cut -d' ' -f2 | tr -d '\r' | base64 --decode

// npm i @x402/fetch @x402/evm viem
import { wrapFetchWithPayment, x402Client } from "@x402/fetch";
import { registerExactEvmScheme } from "@x402/evm/exact/client";
import { privateKeyToAccount } from "viem/accounts";

// Pays at most $0.01 per call.
const client = new x402Client().setSpendControls({ maxAmountPerPayment: "$0.01" });
registerExactEvmScheme(client, { signer: privateKeyToAccount(process.env.EVM_PRIVATE_KEY) });
const pay = wrapFetchWithPayment(fetch, client);

// Not sure it's safe to pay? ToolVet checks it first for $0.005. Pay for that from a separate
// client: this one is capped at $0.01 per payment. GET https://toolvet.app/api/v1/check?url=https%3A%2F%2Fapi.flipvo.com%2Fv1%2Fnonprofit%2Fverify&method=POST
const res = await pay("https://api.flipvo.com/v1/nonprofit/verify", {
  method: "POST",
  headers: { "content-type": "application/json" },
  body: JSON.stringify({
    "ein": "12-3456789"
  }),
});
console.log(res.status, await res.text());

# pip install "x402[requests,evm]"
import os
from eth_account import Account
from x402 import x402ClientSync
from x402.http.clients import x402_requests
from x402.mechanisms.evm import EthAccountSigner
from x402.mechanisms.evm.exact.register import register_exact_evm_client

# Pays at most $0.01 per call.
client = x402ClientSync().set_spend_controls({"max_amount_per_payment": "$0.01"})
register_exact_evm_client(client, EthAccountSigner(Account.from_key(os.environ["EVM_PRIVATE_KEY"])))

with x402_requests(client) as session:
    res = session.post(
        "https://api.flipvo.com/v1/nonprofit/verify",
        json={
            "ein": "12-3456789",
        },
    )
    print(res.status_code, res.text)