Pay per call
Start with a free key (200 requests/month), top up prepaid credits by card or USDC, or let your agent pay per call with x402. Fractions of a cent per request.
Three ways to pay
Start free, prepay as you grow — or let your agent pay per call.
Free API key
200 requests/month, no card. One email and you get an ifk_ key instantly.
Prepaid credits
Buy in bulk, never expires: 1k = $5, 5k = $20, 25k = $80 (down to $0.0032/credit). One credit = one validation or lookup — a batch of N IBANs uses N credits.
Pay by card
Stripe checkout — API key delivered by email. Agents can buy in USDC: POST /v1/credits/buy/1k|5k|25k.
Pay per call
Any agent with a Base wallet pays in USDC, per request, with no account. Discovery at /.well-known/x402.
x402 explained →Endpoint pricing
Start free with 200 requests a month. Pay as you grow — by card, or per request in USDC via x402 on Base L2.
$0.005
per call
Validate a single IBAN with SEPA, issuer, and risk data
$0.002
per IBAN (up to 100)
Batch validation with full enrichment per IBAN
$0.003
per call
Lookup BIC/SWIFT code (121K BIC database, LEI-enriched via GLEIF)
$0.02
per call
Full compliance check with sanctions screening, SEPA Instant reachability, VoP participant status, and risk score (0-100)
$0.003
per call
Swiss BC-Nummer / IID lookup with SIC, euroSIC, Instant Payments and QR-IID data — backed by ~1,200 SIX BankMaster entries
Free endpoints
GET /v1/demo and GET /health are always free — no payment required.
Estimate your monthly cost
Set your monthly volume per endpoint — the total is the sum of every line.
| Endpoint | Volume / month | Monthly cost |
|---|---|---|
| IBAN Validate$0.0050/call | $5.00 | |
| IBAN Batch (per IBAN)$0.0020/call | — | |
| BIC Lookup$0.0030/call | — | |
| Swiss BC-Nummer$0.0030/call | — | |
| Compliance Check$0.02/call | — |
Estimated monthly total
You only pay for what you actually call
$5.00
pay-per-call via x402
Or prepay 1,000 credits for $5.00 — same price, and they never expire.
How payments work
- Agents pay per call with USDC — no account, no API key on this rail.
- Your HTTP client sends a tiny payment with each request — automatically, via standard headers.
- Payments settle on Base (Ethereum L2) — fast, cheap, and verifiable on-chain.
- Free testing available via the /v1/demo endpoint and the /playground.
Example — automatic payment
# Install the x402 HTTP client
npm install x402-fetch
# Then call the API normally
import { wrapFetch } from "x402-fetch"
// Payment handled automatically
const fetch = wrapFetch()
const res = await fetch(
"https://api.ibanforge.com/v1/iban/validate"
)Frequently asked questions
x402 is an open micropayment protocol that uses HTTP status code 402 (Payment Required). When you call a paid endpoint, the server responds with a 402 containing payment details. Your client automatically sends a signed USDC payment on Base, and the server re-processes your request — all within a single HTTP round-trip.
Payments are made in USDC on the Base network. Your HTTP client (or SDK) handles it automatically by attaching payment headers to each request. No wallet UI, no manual confirmation — just fractions of a cent deducted per call. Check the docs for integration examples.
Yes! Generate a free API key at POST /v1/keys/generate with your email. Get 200 requests/month on all endpoints — batch validation counts 1 request per IBAN. No credit card, no crypto wallet needed. For higher volumes, buy a prepaid credit pack by card — or pay per call in USDC via x402.
The per-call pricing scales linearly with no rate limits. For very high volumes (millions of calls/month), open an issue on our GitHub repository (github.com/cammac-creator/ibanforge) — we can discuss custom pricing or a bulk arrangement that makes more sense for your use case.
Embedding IBANforge in your own product? Editor / OEM licensing with SLA and EU invoicing — talk to us.
See the vendors page →Start building for free
Grab a free key in seconds — or start straight away with x402, no account needed. Hit the playground, read the docs, ship when you are ready.