ABA Routing Number Check (US Fedwire/ACH)

Machine-to-Machine Conformance API · aba-routing-check

$0.005 / call 3 free calls/day No signup

Validate a US ABA routing number by its (3,7,1)-weight mod-10 Fedwire/ACH checksum. Catches mistyped or invalid routing numbers before payment; does NOT prevent transfer reversals or establish the recipient. Returns signed XDR-1 receipt.

Honest Scope Guarantee

Checksum-verifiable: a real check-digit algorithm runs offline, so a malformed or transposed identifier is rejected deterministically. It does NOT prove the account/record exists or that its holder is honest — pair with your existing fraud process. A valid checksum does not guarantee the routing number is currently assigned to an active bank.

Run in Playground (Free) Buy Card Credits Agent Quickstart

Quickstart & Execution

cURL (20 Free Calls/Day • Zero Authentication Required)

curl -X POST https://api.code402.dev/v1/tools/aba-routing-check/call \
  -H "content-type: application/json" \
  -d '{"aba_routing":"021000021"}'

No API key needed for the free daily tier. When daily quota exhausts, the endpoint replies with HTTP 402 Payment Required specifying the exact USDC amount. Machines sign an EIP-3009 transfer on Base L2; human engineers buy card credits. Every paid execution returns a cryptographically signed XDR-1 receipt for zero-knowledge audit trails.

Input Parameters

Field	Type	Meaning & Constraints
`aba_routing`	`string`	9-digit US bank routing number.
`routing`	`string`	9-digit US bank routing number (alias).

Response Format

Deterministic JSON payload fields: tool, valid, normalized, country, reason, scope. Paid responses also carry an offline-verifiable receipt object (XDR-1, secp256k1 signature recoverable to the authorized signer).

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