x402 census · app.heinrichstech.com · 423e7dd4dc18 · JSON
POST /v1/cdp/chain/erc20-balance
unprobed
ERC-20 token balance for any wallet — USDC, USDT, DAI, or any token contract — via balanceOf eth_call, with decimals applied. Ethereum or Base mainnet. Pay 0.003 USDC.
Verdict: not verified by an unpaid GET. not probed yet. This says nothing about whether the route works when called as declared.
Facts from the catalogs
| Field | Value |
|---|---|
| URL | https://app.heinrichstech.com/v1/cdp/chain/erc20-balance |
| Method | POST |
| Price | $0.003 USDC = 3000 atomic units of 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 |
| Network | eip155:8453 (base); also accepts xrpl:0, stellar:pubnet, eip155:1440000 |
| payTo | 0xDa2F35d283c42dd60B965322394bc658a5c1769F |
| Seller | app.heinrichstech.com |
| Catalogs | cdp (row updated 2026-09-08) |
| Listed since (lower bound) | 2026-09-08 (earliest catalog timestamp; catalogs report last-update times only) |
| Last catalog update | 2026-09-08 |
| CDP quality counters | 2 calls and 2 unique payers in 30 days, last call 2026-09-08 (catalog-reported, not verified on chain) |
| Category (keyword rule) | chain-rpc |
| Templated path | no |
| x402Version in catalog | 2 |
| Service name / tags | none |
Unpaid probe (census of )
| Field | Value |
|---|---|
| Probe | not probed in this build |
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 |
|---|---|
| Distinct payers | 11 |
| Payments | 17 |
| USDC volume | $0.05 |
| Median payment | $0.001 |
| First / last payment | 2026-07-02 / 2026-09-17 |
| Sampler-shaped share of payments | 100.0% |
| Payers that are not samplers | 0 |
| Source | forensics-2026-09-30 |
| Address | 0xDa2F35d283c42dd60B965322394bc658a5c1769F (contract: EIP7702StatelessDeleGator) |
Declared input and output (extensions.bazaar)
{
"input": {
"body": {
"address": "0x… holder",
"chain": "ethereum | base",
"token": "0x… ERC-20 contract"
},
"bodyType": "json",
"method": "POST",
"type": "http"
},
"output": {
"type": "json",
"example": {
"chain": "base",
"ok": true,
"op": "erc20-balance"
}
}
}
Try it (unpaid: shows the 402)
curl -si -X POST 'https://app.heinrichstech.com/v1/cdp/chain/erc20-balance' -H 'accept: application/json' -H 'content-type: application/json' --data '{}'
The catalog declares POST. 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/423e7dd4dc18/probe.json re-runs this probe right now for $0.01 and writes the result here. POST https://bazaar.agentexchange.work/featured with {"id":"423e7dd4dc18"} 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: agentic.market (CDP Bazaar front end) · this record as JSON · all resources on app.heinrichstech.com.