78trust / 100

Retrieval Packing Displacement

by Packing displacement analysis in Onchain & crypto

x402 APIPassing, checked 37 min ago

Compare strict rank-prefix packing with rank-order greedy-fit and score-density greedy-fit for up to 64 passages under a 1–2048 token budget. Report evidence displacement and optional observed selection violations. Uses declared integer costs/scores; no tokenization or causal attribution. New modular adapter: retained result recovery for 24 hours, minimal receipt metadata for 90 days. Existing live route unchanged.

POST

https://www.mahastrategies.com/api/v1/context/retrieval/packing-displacement

Price: $0.075; per call in USDC
Uptime: 100%; last 30 days
Response time: 222 ms; 552 ms slowest 5%
Last check: Passed; 37 min ago, next any minute now

Run a free test call How to call it

Reliability

All checks passedSome failedAll failedNot checked

Status and outage history · Atom feed · Watch with other listings

How to call it

POST https://www.mahastrategies.com/api/v1/context/retrieval/packing-displacement

Each call costs $0.075 in USDC on Base, paid with the request over x402.

Run a free test callOne unpaid request, the way an agent sends it. You see the payment challenge it gets back. Nothing is charged.

Example request

From the listing.

POST https://www.mahastrategies.com/api/v1/context/retrieval/packing-displacement
content-type: application/json

{
  "budget": 8,
  "candidates": [
    {
      "evidenceIds": [
        "e1"
      ],
      "passageId": "p1",
      "rank": 1,
      "score": 9,
      "tokens": 6
    },
    {
      "evidenceIds": [
        "e2"
      ],
      "passageId": "p2",
      "rank": 2,
      "score": 8,
      "tokens": 5
    },
    {
      "evidenceIds": [
        "e2"
      ],
      "passageId": "p3",
      "rank": 3,
      "score": 3,
      "tokens": 2
    }
  ],
  "dataClass": "synthetic",
  "observedSelectedPassageIds": null,
  "requiredEvidenceIds": [
    "e1",
    "e2"
  ]
}

Parameters

Parameter	Type	Required	Description
`budget`	integer	Yes
`candidates`	array	Yes
`dataClass`	string	Yes	One of: public, synthetic.
`observedSelectedPassageIds`	array or null	Yes
`requiredEvidenceIds`	array	Yes

Example response

The provider's example. We can't check it without paying.

Example response, 74 lines

{
  "data": {
    "chargedAmount": "75000",
    "inputHash": "sha256:dca4136fd984b5a0cd6170947e2b89cf4f9a472443ac80e7b00623a80…",
    "limitations": [
      "Public or synthetic inputs only. Caller labels are declarations,…"
    ],
    "productId": "packing-displacement-analysis",
    "result": {
      "budget": 8,
      "causalityEstablished": false,
      "dataClass": "synthetic",
      "densityDisplacedPassageIds": [
        "p1"
      ],
      "densityGreedy": {
        "coverageBps": 5000,
        "coveredEvidenceIds": [
          "e2"
        ],
        "selectedPassageIds": [
          "p2",
          "p3"
        ],
        "totalScore": 11,
        "usedTokens": 7
      },
      "greedyAddedPassageIds": [
        "p3"
      ],
      "greedyFit": {
        "coverageBps": 10000,
        "coveredEvidenceIds": [
          "e1",
          "e2"
        ],
        "selectedPassageIds": [
          "p1",
          "p3"
        ],
        "totalScore": 12,
        "usedTokens": 8
      },
      "greedyRecoveredEvidenceIds": [
        "e2"
      ],
      "inputSha256": "sha256:dca4136fd984b5a0cd6170947e2b89cf4f9a472443ac80e7b00623a80…",
      "limits": [
        "Public/synthetic is a caller declaration, not content inspection…"
      ],
      "observedSelection": null,
      "rankPrefix": {
        "coverageBps": 5000,
        "coveredEvidenceIds": [
          "e1"
        ],
        "selectedPassageIds": [
          "p1"
        ],
        "totalScore": 9,
        "usedTokens": 6
      },
      "resultSha256": "sha256:45a542ef56b8f1a295b2ca7ab633aa121d2a07a6dd811984bd941498e…",
      "sourcesVerified": false
    },
    "resultHash": "sha256:e26397a7364ab35452088a2f4f61ef63d24abae672c9779f5a34dfd67…",
    "sourceContractAmount": "78000",
    "version": "maha-legacy-adapter/1"
  },
  "proof": {
    "settlement_id": "0x00000000000000000000000000000000000000000000000000000000000000…"
  },
  "success": true
}

Call it from code

The curl command shows the payment challenge. The JavaScript and Python versions pay and call, and never pay more than $0.075.

curl: see the payment challenge

# bash or zsh: see the payment challenge. Nothing is charged.
curl -sS -g -i -X POST 'https://www.mahastrategies.com/api/v1/context/retrieval/packing-displacement' \
  -H 'content-type: application/json' \
  --data-raw '{"budget":8,"candidates":[{"evidenceIds":["e1"],"passageId":"p1","rank":1,"score":9,"tokens":6},{"evidenceIds":["e2"],"passageId":"p2","rank":2,"score":8,"tokens":5},{"evidenceIds":["e2"],"passageId":"p3","rank":3,"score":3,"tokens":2}],"dataClass":"synthetic","observedSelectedPassageIds":null,"requiredEvidenceIds":["e1","e2"]}'

# x402 v2 sends the challenge base64-encoded in the PAYMENT-REQUIRED header (v1 sends it in the body).
# To read the header:
curl -sS -g -o /dev/null -D - -X POST 'https://www.mahastrategies.com/api/v1/context/retrieval/packing-displacement' \
  -H 'content-type: application/json' \
  --data-raw '{"budget":8,"candidates":[{"evidenceIds":["e1"],"passageId":"p1","rank":1,"score":9,"tokens":6},{"evidenceIds":["e2"],"passageId":"p2","rank":2,"score":8,"tokens":5},{"evidenceIds":["e2"],"passageId":"p3","rank":3,"score":3,"tokens":2}],"dataClass":"synthetic","observedSelectedPassageIds":null,"requiredEvidenceIds":["e1","e2"]}' \
  | grep -i '^payment-required:' | cut -d' ' -f2 | tr -d '\r' | base64 --decode

JavaScript: pay and call

// npm i @x402/fetch @x402/evm viem
import { wrapFetchWithPayment, x402Client } from "@x402/fetch";
import { registerExactEvmScheme } from "@x402/evm/exact/client";
import { privateKeyToAccount } from "viem/accounts";

// Pays at most $0.075 per call.
const client = new x402Client().setSpendControls({ maxAmountPerPayment: "$0.075" });
registerExactEvmScheme(client, { signer: privateKeyToAccount(process.env.EVM_PRIVATE_KEY) });
const pay = wrapFetchWithPayment(fetch, client);

// Not sure it's safe to pay? ToolVet checks it first for $0.005. Pay for that from a separate
// client: this one is capped at $0.075 per payment. GET https://toolvet.app/api/v1/check?url=https%3A%2F%2Fwww.mahastrategies.com%2Fapi%2Fv1%2Fcontext%2Fretrieval%2Fpacking-displacement&method=POST
const res = await pay("https://www.mahastrategies.com/api/v1/context/retrieval/packing-displacement", {
  method: "POST",
  headers: { "content-type": "application/json" },
  body: JSON.stringify({
    "budget": 8,
    "candidates": [
      {
        "evidenceIds": [
          "e1"
        ],
        "passageId": "p1",
        "rank": 1,
        "score": 9,
        "tokens": 6
      },
      {
        "evidenceIds": [
          "e2"
        ],
        "passageId": "p2",
        "rank": 2,
        "score": 8,
        "tokens": 5
      },
      {
        "evidenceIds": [
          "e2"
        ],
        "passageId": "p3",
        "rank": 3,
        "score": 3,
        "tokens": 2
      }
    ],
    "dataClass": "synthetic",
    "observedSelectedPassageIds": null,
    "requiredEvidenceIds": [
      "e1",
      "e2"
    ]
  }),
});
console.log(res.status, await res.text());

Python: pay and call

# pip install "x402[requests,evm]"
import os
from eth_account import Account
from x402 import x402ClientSync
from x402.http.clients import x402_requests
from x402.mechanisms.evm import EthAccountSigner
from x402.mechanisms.evm.exact.register import register_exact_evm_client

# Pays at most $0.075 per call.
client = x402ClientSync().set_spend_controls({"max_amount_per_payment": "$0.075"})
register_exact_evm_client(client, EthAccountSigner(Account.from_key(os.environ["EVM_PRIVATE_KEY"])))

with x402_requests(client) as session:
    res = session.post(
        "https://www.mahastrategies.com/api/v1/context/retrieval/packing-displacement",
        json={
            "budget": 8,
            "candidates": [
                {
                    "evidenceIds": [
                        "e1",
                    ],
                    "passageId": "p1",
                    "rank": 1,
                    "score": 9,
                    "tokens": 6,
                },
                {
                    "evidenceIds": [
                        "e2",
                    ],
                    "passageId": "p2",
                    "rank": 2,
                    "score": 8,
                    "tokens": 5,
                },
                {
                    "evidenceIds": [
                        "e2",
                    ],
                    "passageId": "p3",
                    "rank": 3,
                    "score": 3,
                    "tokens": 2,
                },
            ],
            "dataClass": "synthetic",
            "observedSelectedPassageIds": None,
            "requiredEvidenceIds": [
                "e1",
                "e2",
            ],
        },
    )
    print(res.status_code, res.text)

Security scan

No findings

We scan names, descriptions and tool definitions for hidden instructions and other prompt-injection patterns.

Recent checks

When	Result	HTTP	Time	Price
37 min ago	Passed	402	257 ms	$0.075
5 h ago	Passed	402	552 ms	$0.075
10 h ago	Passed	402	378 ms	$0.075
15 h ago	Passed	402	185 ms	$0.075
19 h ago	Passed	402	222 ms	$0.075

Show 3 older checks

24 h ago	Passed	402	237 ms	$0.075
28 h ago	Passed	402	221 ms	$0.075
32 h ago	Passed	402	192 ms	$0.075

Trust score 78/ 100

Availability (30-day uptime)		30 / 30
Valid x402 challenge		15 / 15
Response time		10 / 10
Real paying agents (30 days)		3 / 15
Charges what it lists		10 / 10
Security scan		10 / 10
Verified owner		0 / 10

How the score works

Payment terms

Price: $0.075 per call
Listed at: $0.075
Token: USDC
Networks: Base
Pays to: 0xec84…de28

Real usage

Paying agents: 1 in 30 days
Paid calls: 1 in 30 days
Last paid call: 37 h ago

Source: x402 Bazaar settlement data.

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Trust score

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