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1 ---
2 title: "ProcureNet USDC Payment Settlement on EVM Networks"
3 sidebarTitle: "Payment Settlement"
4 description: "Learn how ProcureNet settles payments in USDC across Base, Arbitrum, Polygon, and Ethereum, including field evaluator payout tiers."
5 ---
6
7 ProcureNet settles payments in USDC stablecoins on EVM-compatible networks. Whether you are integrating a buyer-facing checkout, running a procurement workflow, or disbursing payments to field evaluators, every payment follows the same on-chain settlement path: a payment request is created, a deposit address is shared with the payer, and the system watches for confirmation before releasing funds. This approach ensures deterministic, auditable settlement without reliance on traditional payment rails.
8
9 ## Supported Networks
10
11 You can settle payments on any of the following EVM networks. Specify the network when creating a payment request.
12
13 <CardGroup cols={2}>
14 <Card title="Base" icon="circle-b">
15 Low fees and fast finality. Recommended for high-volume procurement flows.
16 </Card>
17 <Card title="Arbitrum" icon="circle-a">
18 Layer-2 rollup on Ethereum with low transaction costs and broad wallet support.
19 </Card>
20 <Card title="Polygon" icon="hexagon-check">
21 Widely supported, low-cost EVM network with mature tooling.
22 </Card>
23 <Card title="Ethereum" icon="ethereum">
24 The canonical EVM mainnet. Use when counterparties require settlement on L1.
25 </Card>
26 </CardGroup>
27
28 ## Payment Flow
29
30 Follow these steps to create and confirm a USDC payment.
31
32 <Steps>
33 <Step title="Create a payment request">
34 Call `POST /mods/procurement_wallet/usdc/request` with the amount, network, and any evaluation metadata. Authenticate using your `x-perplexity-mod-key` header.
35
36 ```bash
37 curl -X POST https://api.procurenet.io/mods/procurement_wallet/usdc/request \
38 -H "x-perplexity-mod-key: <api_key>" \
39 -H "Content-Type: application/json" \
40 -d '{
41 "amount": 250,
42 "network": "base",
43 "currency": "USDC",
44 "recipient": "0xYourWalletAddress"
45 }'
46 ```
47
48 The response includes a `payment_id`, `deposit_address`, `qr_code`, and `expires_at` timestamp.
49 </Step>
50
51 <Step title="Share the deposit address with the payer">
52 Display the `deposit_address` or render the `qr_code` in your UI. The payer sends USDC to this address on the specified network. No additional API call is needed at this stage — ProcureNet monitors the address automatically.
53 </Step>
54
55 <Step title="Watch for confirmation">
56 Poll `GET /mods/procurement_wallet/usdc/watch/{paymentId}` to check settlement status. The endpoint returns the current confirmation state and, once confirmed, a `transaction_hash`.
57
58 ```bash
59 curl https://api.procurenet.io/mods/procurement_wallet/usdc/watch/pay_xyz \
60 -H "x-perplexity-mod-key: <api_key>"
61 ```
62
63 Continue polling until the response status is `confirmed`. Implement exponential backoff — most networks confirm within seconds on Base and Arbitrum, and within minutes on Ethereum mainnet.
64 </Step>
65
66 <Step title="Receive the transaction hash">
67 On confirmation, the watch endpoint returns a `transaction_hash`. Store this value as your permanent, on-chain proof of settlement. It can be verified independently on any EVM block explorer for the target network.
68 </Step>
69 </Steps>
70
71 <Info>
72 Each payment request carries an `expires_at` timestamp. If the payer has not sent funds before that time, the request expires and cannot be confirmed. Create a new payment request and share the updated `deposit_address` with the payer.
73 </Info>
74
75 ## VCI Field Evaluator Payment Tiers
76
77 For field evaluation workflows, ProcureNet calculates the USDC payout automatically based on the evaluator's average quality score. You do not need to specify an amount manually — pass the evaluation results when creating the payment request and the bridge applies the correct tier.
78
79 <Note>
80 Payments for field evaluations are calculated automatically from the submitted evaluation results. You do not need to specify an amount manually — pass the evaluation data when creating the payment request and ProcureNet applies the correct payout tier.
81 </Note>
82
83 | Average Evaluation Score | USDC Payout |
84 |---|---|
85 | ≥ 9.0 | 500 USDC |
86 | ≥ 7.0 | 250 USDC |
87 | ≥ 5.0 | 100 USDC |
88 | < 5.0 | 0 USDC |
89
90 <Accordion title="How the tier is calculated">
91 ProcureNet averages all evaluation scores submitted for an assignment. If an evaluator submits five evaluations with scores of 8.5, 9.2, 7.8, 8.0, and 9.5, their average is 8.6 — which falls into the ≥ 7.0 tier and triggers a 250 USDC payout. The platform computes this automatically; no manual tier selection is exposed via the API.
92 </Accordion>
93
94 ## Admin Manual Confirmation
95
96 In exceptional cases — such as on-chain delays or network congestion — an administrator can manually confirm a payment using `POST /mods/procurement_wallet/usdc/manual-confirm`. This endpoint requires an `x-admin-key` header and should only be used when automated confirmation has stalled.
97
98 ```bash
99 curl -X POST https://api.procurenet.io/mods/procurement_wallet/usdc/manual-confirm \
100 -H "x-perplexity-mod-key: <api_key>" \
101 -H "x-admin-key: <admin_key>" \
102 -H "Content-Type: application/json" \
103 -d '{ "payment_id": "pay_xyz" }'
104 ```
105
106 <Warning>
107 Manual confirmation bypasses on-chain verification. Only use this endpoint when you have independently verified the transaction on a block explorer and are certain the funds have arrived. Misuse can result in double-confirmation or incorrect payout records.
108 </Warning>