x402 census · api.freesmallbiztools.com · 3649f7c4feb4 · JSON
GET /v1/late-fee-notice
live
Write a late-fee reminder email for an overdue invoice. $0.01 USDC on Base per call. Calculates the late fee and returns a ready-to-send subject and body in a polite, firm or final tone. Bad input returns 400 and is not charged. Don't use this for sending email; it only returns text.
Verdict: live. The unpaid GET reached a valid 402. The live amount equals the catalog price.
Facts from the catalogs
| Field | Value |
|---|---|
| URL | https://api.freesmallbiztools.com/v1/late-fee-notice |
| Method | GET |
| Price | $0.01 USDC = 10000 atomic units of 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 |
| Network | eip155:8453 (base) |
| payTo | 0x2dAF658B01e257206375798a15832E9f547D65dD |
| Seller | api.freesmallbiztools.com |
| Catalogs | cdp (row updated 2026-10-25), payai (row updated 2026-10-24) |
| Listed since (lower bound) | 2026-10-24 (earliest catalog timestamp; catalogs report last-update times only) |
| Last catalog update | 2026-10-25 |
| CDP quality counters | 4 calls and 3 unique payers in 30 days, last call 2026-10-25 (catalog-reported, not verified on chain) |
| Category (keyword rule) | other/unknown |
| Templated path | no |
| x402Version in catalog | 2 |
| Service name / tags | Free Small Biz Tools · late-fee, invoice-reminder, overdue-invoice, email-template, small-business |
Unpaid probe (census of 2026-10-22)
| Field | Value |
|---|---|
| Probed at | 2026-10-22T00:36:52.243Z |
| HEAD | 400 |
| GET | 402 |
| Verdict | live live: valid 402 to an unpaid GET |
| 402 carried in | header |
| x402Version in the 402 | 2 |
| accepts[0] | {"scheme":"exact","network":"eip155:8453","amount":"10000","payTo":"0x2dAF658B01e257206375798a15832E9f547D65dD","asset":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","maxTimeoutSeconds":120,"extra":{"name":"USD Coin","version":"2"}} |
| Live amount equals catalog price | yes |
| Live payTo equals catalog payTo | yes |
| extensions.bazaar in the 402 | yes |
| PAYMENT-REQUIRED header | yes |
| WWW-Authenticate offer | none |
| Content type / server / CORS | application/json / cloudflare / * |
| Latency | 459 ms |
| Error | Payment required |
No hourly re-probe has reached this resource yet; the cron covers a rotating slice of 150 per hour.
On-chain facts for the payTo (public address)
| Field | Value |
|---|---|
| Settlement history | unresolved: payTo not seen in the payer forensics (180 wallets' outbound history) or the Blockscout sample |
Declared input and output (extensions.bazaar)
{
"input": {
"method": "GET",
"queryParams": {
"amount": "1200",
"due_date": "2026-09-01",
"paid_date": "2026-10-14",
"rate": "1.5",
"rate_type": "monthly_percent",
"tone": "polite"
},
"type": "http"
},
"output": {
"type": "json",
"example": {
"email": {
"body": "Hi there, ...",
"subject": "Friendly reminder: your invoice was due 2026-09-01"
},
"kind": "late_fee_notice",
"tone": "polite"
}
}
}
Try it (unpaid: shows the 402)
curl -si -X GET 'https://api.freesmallbiztools.com/v1/late-fee-notice' -H 'accept: application/json'
The catalog declares GET. A 402 answer carries the payment requirements in the JSON body and, for x402 v2, base64 in the PAYMENT-REQUIRED header. This page never sends a payment.
Paid checks (x402, USDC on Base)
GET https://bazaar.agentexchange.work/r/3649f7c4feb4/probe.json re-runs this probe right now for $0.01 and writes the result here. POST https://bazaar.agentexchange.work/featured with {"id":"3649f7c4feb4"} places this resource at the top of the report and search pages for 30 days for $1.00, labelled. Unpaid requests answer 402 with the terms. Pricing.
Catalog references: PayAI listing status · agentic.market (CDP Bazaar front end) · this record as JSON · all resources on api.freesmallbiztools.com.